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Location:
tas
Registered:
June 2002
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what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 09:42
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ok so i started the supra up this afternoon, as it hadn't been started in about a week, i let it warm up, then i whent and picked up some friends to head off to a party, on the way i gave it abit to see that it still had that great power, which it did, and by the way my friends were impressed. But right after i gave it that bit of power the engine was sounding very rouph, like it was running on 5 cylinders, or a spark plug wasn't firing, or even the injectors bieng blocked up. I dropped my friends off and whent striaght home, it did not improve, it idles abit rouph, again sounds like it is running on 5 cylinders.
when i got home i took out the first spark plug at the front and it was covered in oil, is that normal?
i believe it must be either a stuck valve, a spark plug, or the oil getting into the spark plug that could be the cuase. also sounds more tappety then it used to.
please help me, are there any things to check to find out why it's doing this? have you guys had any simular problems like this?
the engine is a 7MGTE
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Registered:
August 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 10:03
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Test the leads and inspect the spark plug for fouling.
Do a systematic approach, unplug each lead one at a time, if 1 cylinder has an issue then 5 times out of 6, the engine will run on 4 cyls. 1 time it will make no difference, if you remove the lead or not, this will be the cylinder in question.
Im going to say lead or plug, if it is either, swap the entire set of either leads or plugs in one go.
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I supported Toymods
Location:
Sydney
Registered:
November 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 12:51
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You should check any vacume lines.
I had a similar problem with my 22R-E. After taking it for a spin it just lost power.. (well not that is had much to start with.  ) and was idling rough, pulled the leads and spark plugs off and the the plugs had heaps of build up on them.
Also when you play with the throttle there was a rush of air in the engine bay sure sign of a vacume leak.
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 12:51
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BlackSupra thanx so much for your advice, i was so worried that i had done some major damage to the engine, as the problems arose right after i floored it. but it does sound like a spark plug or lead, and will test first thing tommorow. will post back what i find.
so i take it oil is supposed to be in the region where the spark plugs go? thanx again.
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Location:
UK
Registered:
May 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 14:08
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no.. the oil in the spark plug well means that one of your cam cover gaskets is leaking.. common problem.
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Location:
Brisbane
Registered:
June 2003
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 14:11
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can also mean oil seals gone...family's eunos 500 was blowing blue smoke on cold startup...valve stem seals...oil was on sparkplugs.
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 15:08
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yes yes its all making sense to me now, i noticed every time i start up my supra i get alot of white maybe slightly blue tinge smoke coming out of the exuast, but it seems to go away after 30 mins. i'd say it's definetly an oil leak problem, i'll know for sure tommorow, when i pull all the pipes and stuff off so i can take the cam cover off for the first time. thanx alot for your help guys, i'd be so stuffed with out your help. i'm not paying any mechanic to work on my supra as i don't trust any of them, and i don't wanna pay the huge toyota dealer prices.
by the way when i have the cam cover off, can i retoque the head easily? i just got a torque wrench, what fitting will i need for the headbolts on a 7mgte? it was never torqed above the toyota 52ft spec.
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Location:
UK
Registered:
May 2002
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Re: what have i done to my supra! it's f#$ked
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Sat, 23 August 2003 15:36
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Hang on.. is there oil on the spark plug tip or in the hole where the plug sits? The second one indicates cam cover leaking amd wont contribute to any smoking from the exhaust... the first one indicates another problem.
Retourqing the head is a 50/50 affair.. you can either unsettle it and cause a BHG there and then, or you get away with it and decrease the chances of a future bhg.. up to you. Youve got just as much chance of one than the other.
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 02:51
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ok since its stopped raining and its day light i had a chance to see that when i pull the spark plug cover out there is indeed alot of oil around the actual sparc plug, i didn't take the spark plug out, but i's imagine that it's possible that oil could seep thru the spark plug threads and end up in the chamber.
i will have to take the cam cover off to inspect it properly.
seems like a big job with all the stuff bolted on top.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 05:23
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| dingaling wrote on Sun, 24 August 2003 12:51 |
but i's imagine that it's possible that oil could seep thru the spark plug threads and end up in the chamber.
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i hope not!! how is the spark plug going to seal in the combustion gases and still let oil seep in?? maybe the oil gets on the plugs when you pull them out? or is it burnt on?
Cya, Stewart
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Location:
Brisbane
Registered:
June 2003
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 06:12
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is the oil on the thread of the spark plug?
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 06:56
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Yes it is, but it's possible that i accidently got the oil on the spark plug when i removed it like oldcorollas said. I haven't been able to check all the plugs only the first one. It's just none stop rain today, and i still have to get the courage up to removing all the pipes and the thousand other parts to get the cam covers off. I'm a computer technician, so hopefully i won't find working on cars too much harder  that's probably bieng abit optimistic.
There is defeintly something up with the engine, i should of noticed the signs before. every time i start the engine a lot of white smoke would come pouring out the back of the exuast, so something must be leaking into the chambers? also it had a leaky cam seal when i first got it, i tightened the cam down as the bolts were loose and it stopped leaking oil on the ground, but must still leak inside cam area. also one valve didn't sound too good to begin with, now it sounds like 2 valves need work after last night when i floored it.
does anyone know a part number or can sell me a cam seal?
[Updated on: Sun, 24 August 2003 06:58]
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Location:
Brisbane
Registered:
June 2003
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 07:18
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arent they cheap as chips from repco or anything?
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 07:27
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thanx i'll check it out.
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Location:
Brisbane
Registered:
June 2003
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 10:04
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i know valve stem seals are like 80 cents each or something
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Location:
Taree
Registered:
August 2003
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Re: what have i done to my supra! it's f#$ked
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Sun, 24 August 2003 10:39
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like siad before if the plugs are oiled up not from taking it out and getting oil on it from the rocker cover leak you've got major issues i.e cracked piston (from detnation etc etc), wouldn't hurt to give it a compression check in situations like this, if number 1 is the out lier in the check and the plug is oiled and its got a miss and a tapping noise....then it ain't good bro, prob a piston, but if the oil come from the leak in cover gasket and got on it when you pulled it out (you should be able to tell the difference) it could be a lead or a plug, check resistance and swap plugs around with known working ones to see
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: what have i done to my supra! it's f#$ked
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Mon, 25 August 2003 00:56
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Sounds like it could be a head gasket problem to me.... I had exactly the same thing happen in my 7M soarer... it started running roughly, weird sounding idle then two days later a big puff of white smoke out the exhaust 
have you torqued the head bolts down since buying it or had them checked?
my car also has oil in the spark plug chambers.... apparently its a known issue with the 7m's, i have a feeling its a non related issue to your problem
Dan
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 07:01
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so i take it having oil sitting around the spark plugs isn't normal? what i mean is when i take one of the plugs out that cover the spark plug, there is about 1cm of dark thick oil like it's been flooded in there.
no i didn't have it retorqed yet. but it shouldn't of done a headgasket yet, it was just done by toyota before i buaght the car, and hasn't travelled more then 500km's since i got it a few months ago. shit, it's times like these i wish i knew more about mechanics. i wish i was able to just take it apart pin point the problem put it backtogether and have a reliable car.
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Registered:
August 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 07:19
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7mgte x supra = < reliable 
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 07:23
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equals less than reliable?
dam that's not good, why can't they be reliable? is it becuase there sports cars? and thus are always bieng stressed out alot more?
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Registered:
August 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 07:30
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No matter how hard you try to maintain your supra there will always be 1 problem with it, no matter how insignificantit may be........always 1!
If someone says they have a perfect supra......they lie!
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 07:40
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that i can understand, but surely they aren't too unreliable if you take nessecary precuations like tighten the head. i thought all toyotas were reliable? maybe i should just drive my 7mgte until it's completly fucked, then just buy a whole new engine for $1500, could work out cheaper than continously fixing/restoring the old engine?
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Registered:
August 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 08:03
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If you buy another 7mgte it would be advisable to replace the headgasket as the past history of the engine would be unknown to you.
Do it once and do it properly.
Yes toyota's are reliable, however this is one of the very few production issues that have occured.
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Registered:
November 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 09:27
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Seems that a lot of ppl in these forums have problems with 7M's it might be a valid option to go for a 1jz-gte conversion. I would however take you current motor to a mechanic, and get it looked at.
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Location:
Brisbane
Registered:
June 2003
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 09:38
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but theres no NEED to change to a 1jz. The 7m is a bloody good engine once you can solve the head problems. O-ring block, and mhg if you insist to resist it blowing again, you have an engine that is damn close to as good as a 1jz...i believe the 7m bottom end is stronger..but personal opinion. They just like to begiven some care and good maintenance, as do most engines...rev the crap out of them and deprive them of good oil, big end bearings can fail...Big ends are not just a toyota specified 7m problem though..a mates pajero just spun one if its any consilation!
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 09:49
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how are these 1jz's compared to the 7mgte's? i gather they rev higher but don't provide as much low down torque? and perform nealy identicle given the weight of the supra. I really think maybe i should try to preserve the enging i have, as today i had a closer look and the k's the car has is 150,000km's but the plate under the bonnet says the engine is a 7MGEU so obviosly this 7MGTE has been put in it's place wich also indicates the engine has done less then 150,000Km's.
I still haven't worked out if oil is supposed to be visible when you take a spark plug cover thing out. can someone else go take a spark plug cover off and look inside and tell me if they have oil sitting inside. if i could find out if that was normal or not i may be able to find out what the problem is without having to pull the car to bits. ie if oil is suppose to be sitting there then perhaps i really do just have a dud spark plug or lead or a valve that is cuasing one of the cylinders to not fire. i really haven't been able to work with this constant rain and cold weather, and i don't have a garage or anywhere out of the weather to work on it :(-
and buy the way are you telling me i might have a done a big end? i sincerly hope not. altho i would be able to tell by the noise correct? sounds like valve trouble from the noise.
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Location:
Melbourne
Registered:
May 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 09:57
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Check your 3000 pipe if its REALLY caked in oil inside and you have done a few km maybe your turbo has shat itself clean it put it back on go for a drive it it oils up again quickly your due to hi-flow your turbo
if you run a bit of boost i would defintly do a compression check aswell
As far as engines blowing up ANY engine will blow up when you give it a hard time typicly a 7m-gte has had a longer hard time then a jz engine
and if it is terminal i really cant see much difference from a rebuilt 7m-gte to a 2jz-gte besides the fact if the car comes with a 7m its a lot easyer to hide a hi-flow ct-26 then any large turbo conversion on a 2jz
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Location:
NSW
Registered:
August 2003
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 10:43
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Firstly dude I'd check the easier stuff like the plugs and leads. As whats been said before. Check the leads one at at time. Check for any fouling on the plugs and as the last resort replace all the plugs and leads. By the way you've described it, it sounds as if you've blown a plug or lead. Your better of doing this first rather than looking at a BHG or rooted turbo.
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Location:
Brisbane
Registered:
November 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 10:48
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7MGTE's are good once you sort the head gasket issue, don't listen to anyone who says they're a dud engine.
Don't waste the money on a 1JZ conversion unless you plan on putting a big single turbo one it very soon, they are almost as renowned for turbo problems as the 7M is for head gasket problems.
Personally I say either replace the 7M and fit a metal head gasket... or else save your coins and buy a 2JZGTE.
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 10:57
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boj01: yes i concur.
Allan: last time i looked in my 3000 pipe it did indeed have a little build up of oil, but not much. is that a sign of things gone wrong? my turbo seems to work really well, but then again it's my first turbo i've owned, just running stock everything. no extra boost.
7M-Brisbane: I'd prefer to fix the engine that is in it if it's not major damage. from what you've read you think my engine sounds rooted? maybe you can give me a clear cut answer in regards to if there is suppose to be heaps of oil sitting inside the cam covers ie pull out the spark plug cover and tell me if there is oil sitting in there? i have about a 1cm deep of it.
nobody has yet stated if that is normal or not
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Location:
UK
Registered:
May 2002
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Location:
tas
Registered:
June 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 13:13
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HedgehogSandwich: Yes i see now that you answered my question.
sorry about that, it must be my ADD 
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Location:
UK
Registered:
May 2002
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Re: what have i done to my supra! it's f#$ked
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Tue, 26 August 2003 13:39
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Like i say its very likely that this is whats causing your misfires..
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