| Author | Topic |
|---|
Location:
Forrestfield, WA
Registered:
August 2002
|
 JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 09:39
|
 |
One huge major problem with this car that has been going on for six months or so. It just randomly dies. Driving along, engine just shuts off, wont even crank over to restart. No Check Engine light, no indication of a problem.
Over the last couple of months we've gone over everything from it being the Alarm System, Fuel regulator, Battery, Power leads, Fuel Pump (just been replaced), fuel lines, wiring looms.. everything.
It stopped doing it for about a month... for no particular reason then just started again. We wired up a secondary ignition circuit with a push button to start it so when it dies completely and wont crank, we can force it to crank over and eventually by switching power on and off it seems to right itself and go.
The problem is totally random, ie it can happen cold... hot... when the car is idling at the lights, when im doing 100km/h down the freeway, it just dies.. full stop.
Im down to the point where it pretty much HAS to be either the ECU is faulty, or something sensor related.. (ie crank angle sensor or something crazy i was told).
Pretty much I just need a suggestion or something or advice from anyone who has had the same or similar problem. Ive spoken to most of the import people around and they're all scratching their heads. Ive done everything that people have recommended like changing regulators and all that sorta thing but I'm pretty sure its an electrical problem.
Ive got an Apexi S-AFC on order that should arrive this week sometime, I'm gonna fit it up and see if i can get any info out of it when the problem occurs as it monitors like boost and vacuum pressure and all sorts of stuff apparently. The fuel pump I fitted was a HUGE mother - Bosch 975 which is supposedly good for up to 600hp I've been told, and considering the only engine mods I've got are 3" zorst from turbo to tip and pod filter this should do the job.
Apart from that when the car runs its runs PERFECTLY, no other problems whatsoever... but this problem makes the car totally unreliable as it can run fine for 2-3 days then one day sitting in traffic it just carks it and wont start. So i use the manual starter switch we wired up to crank the car over, but it just refuses to fire, or starts then dies straight away.
Help me obiwan kenobi.. you're my only hope..
- Russ
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:16
|
|
"wont even crank over" are the key words here the starter motor is prolly the most basic thing on the car, unless its an auto the starter should go no matter what, i would say check the alarm first then i would check your battery it may have a cracked plate inside and then battery cables fuses ect ect sounds like a loss of power thing to me i would even consider runing a volts and amps gauge tempory just to keep an eye on things
Allan
|
|
|
Location:
Peakhurst, Sydney
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:35
|
|
The most complicated problems tend to be caused by the simplest of things.. I would be checking for all the sensors, esp the connections to/from. Make sure everything is bolted down right.. you say it happens randomly, but there must be a common factor causing it all the time.. just to find it. It may be happening at a particular vibration (or the fundamental vibration node of the offending component) .. That's why I say to make sure everything is bolted right.. If it is vibration-related, simply changing the tyre-pressures may eliminate/worsen the issue for the time being.. OK I'm not really sure about anything I said, or what the fundamental vibration node is, but just brainstorming out loud... hope it helps.
PS
It is, however the best excuse I have heard yet for buying a S-AFC!!
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:37
|
|
It doesnt crank over when you turn the key, but with the secondary ignition circuit I wired up with a starter under the dash it cranks fine.
ive thought it was everything from the igntion barrel to immobiliser cutting... ive elimated all of these.
Nothing else in the car loses power, ie stereo still runs, digital dash still illuminated etc..
Thanks for the feedback anyway dude 
|
|
|
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:39
|
|
a hidden Turbo timer ??
or some other device with similar capabillity ??
try another ecu.
Matt
|
|
|
I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:43
|
|
|
had a friend with the same problem yet in a VT and it was a faulty crank angle sensor.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 10:51
|
|
Heh well at one point we were convinced it was the Turbo Timer, and for a period of a month i left the timer off and it worked fine, then Bang started again and the timer had been off for 3 months.
Disconnected the timer and disabled the alarm system and it still does it so yeah... :\
Thanks for your reply
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 11:05
|
|
Ive been told it could be the crank angle sensor... but yeah been so side tracked with other items it skipped my attention.
Ive got a toyota workshop manual that covers all JZ engines... its just in japanese cover to cover. im going to locate it, and check all the wiring and stuff.
When they say faulty does that mean it need to be replaced fullstop or faulty as in wiring bad or dodgey connections?
Thanks for your reply dude.. i think you could have hit the nail on the head
|
|
|
Location:
Toowoomba
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 11:31
|
|
Russ
Sorry I can't help with your problem - just a query about your manual. You say that you have the Jap manual. Is this the one you see on the internet at Startrade for about $160. Is it any good. I've thought about orderering it but would like to see one or hear from someone who has one first.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 11:55
|
|
Umm its the Toyota Workshop manual for 1JZ-GE, 1JZ-GTE, 2JZ-GE, 2JZ-GTE.
Has all the clearances, torque settigns etc for specifically just the engine. Is good even though its in japanese cover to cover.
I ordered it through local toyota dealer, cost me like $60.
What is this other manual you speak of?
|
|
|
Location:
Toowoomba
Registered:
May 2002
|
|
|
I supported Toymods
Location:
Adelaide
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 12:42
|
|
Just a thought, but have you looked into an earthing problem? If there is a faulty earth at some point, say the ECU or battery, things will be bad.
Worth a try, but as somebody suggested, a volt meter connected to battery and then body will tell you what is happening.
Make sure engine ground is good and fat, as part of the starter may earth on this or alternator.
Jaz
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 12:43
|
|
Thats the one dude, ive found original invoice.
it cost me $59.60, this was in September 2000 when i bought it.
toyota part # T63036
totota description "1JZ GTE MANUAL"
I got it from Midland Toyota in Western Australia, but i assume any toyota dealer can get it.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 12:46
|
|
Umm we hooked up a few extra earthing leads using aligator clips and cabling from various points to see if it was this to no avail.
I havent checked the earth directly to the ECU as yet but ill check it out when i fit the S-AFC.
Im seriously thinking about the earlier suggestion of it being the crank angle sensor. Now its just a matter of finding it.. (i know roughly where it is) and tracing the wiring back to teh ecu.
Thanks for the reply
- Russ
|
|
|
I supported Toymods
Location:
Adelaide
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 12:47
|
|
Can't be bothered edit so:
With the talk of faulty sensor, surely the check engine light would have come on if it sarted to give faulty readings. I take it you have cheaked the ECU memory for any faults.
I guess, if the fault was quick enough, and the power completely dies, the ECU may not have time to store the error in memory, or the +10sec from engine dying and sarting is wiping the ECU memory.
Jaz
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 13:05
|
|
Actually good point, i asked someone about that and they said ahh no it cant be that sensor then otherwise there would be a check engine light.
But... then i spoke to someone else and said with the crank angle sensor the way it shuts down the engine it cuts the ignition circuit so the ecu thinks the car was stopped by the driver and thus records no fault... weird...
Just more pieces of the puzzle...
Thanks again, its good to see there are alot of people out there with advice to offer
|
|
|
Registered:
June 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 21:20
|
|
You haven't said any where if it's an Auto or not??
If it is check the neutral start switch in the GB.
I think this is linked to the start signal for the ECU.
If it won't crank over, then it may be the neutral start switch which is linked to the ECU start signal. Which is why it won't start when you use your button (unless you've wired it into the ECU also).
Just my thoughts!!
|
|
|
I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 21:42
|
|
I sort of had a similar problem. When i installed my 4age and microtech it started fine a couple times then we checked timing then tried to start again and it wouldn't even crank over. Next day tried again and it started fine, then stoped again and wouldn't even crank. Then after this for a bit it just wouldn't ever crank.
Turned out to be a faulty ECU earth, it would earth sometimes and not others. It ended up blowing a part of the ECU which is why it stoped working all together. It was a microtech so just got it fixed for $80, relocated the earth and havn't had a problem since.
Sounds like a dodgy earth to me and as has been said at certain vibrations it comes loose.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 22:51
|
|
Heh sorry, Yes it is an automatic, but we've pretty much ruled out the neutral starter cut out as I believe the not starting and the dieing problem are cause by the same fault. Nethertheless i'm going to double check it again just to make sure
Thanks for your advice, you people are really helpful )
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Sun, 25 August 2002 22:57
|
|
Hmm well the ECU is at the top of my suspect list. ACtually when i pulled the deck out to connect up my stacker I noticed the dudes who fitted the deck and the alarm did a pretty dodgey job.. (Alberts in Western Australia) and speaking to a few other stores they have a bad rep. for dodgey work.
It is possible theyve buggar'd something up and eventually its started to cause this problem. The ECU is coming out to have a look at, plus i need to wire in my S-AFC when it arrives so I should be able to work out where the ground is and goes through my wiring diagrams to see if it is that. I might trace the loom as far forward as i can for dodgey connections.
Thanks for your reply, ive now got a few things on my list to attack and hopefully get rid of this frustrating problem.
|
|
|
Location:
Sydney
Registered:
May 2002
|
 Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 00:36
|
|
You have a bad (intermittent) connection. Thee next step is to locate this, so then it can be fixed. The fact that the stereo continues indicates power circuit from battery (ACC) is ok.
No cranking shows power feed (+12)is being lost. A bad earth can cause confusing symtoms.Check motor to body strap to negative battery.Remove all, clean with emery, spray WD40, reassemble tight. Uncover ECU connector, when power goes off, dont disturb anything, measure volts on all pins on the connecter and write them down. After a few episodes you will find out where volts being lost, can renew (or bypass) that cable.
Pedro
*****
|
|
|
Location:
Canada
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 02:25
|
|
Take out the alarm and all of the wiring that was added, repair all of the vehicle's wiring that was cut for the alarm, then start diagnosing.
If you are losing power to some of the circuits in the car but not others, you must fix this first.
You will need to check the fuse blocks (when the car is dead)
with a test light to determine which circuits are dead.(ign on)
You will probably need to look at an EWD at the dealer to narrow down the potential areas that the fault could be in.
When the car dies, you have said that there is no check engine light. If you leave the Ign on after it dies, is this still so?
It seems you have lots of clues, you need to read the EWD to know where to check.
|
|
|
Location:
Sydney
Registered:
July 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 05:15
|
|
I had the same problem on my car.
Power the dizzy straight from the positive side of the battery.
My ignition wire from the loom to the dizzy was partly broken.
Everything still worked fine, except ignition.
Once you have power to your dizzy, ignition should work.
That is why your second push button starter works.
My car was doing it for ages, then just would not start at all.
The big "IF" is that this will help "IF" you have the same problem as me.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 08:02
|
|
Well its down to either an earth fault or a faulty sensor.
I dont think it has a distributor, it has coils.. if that makes sense.
Im pretty sure its not the alarm system as we bypassed that and still had the problem.
|
|
|
I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 09:16
|
|
|
the VT would drive along normal then the engine would just shut down and wouldn't start again but later on it would, replaced the crank angle sensor and never had a problem since not sure how much they cost but maybe its worth just buying another one and put it in see how it goes then, or take it to toyota tell them the problem and tell them what you think it could be and by the end of the day you should have it back no problems
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: JZA70 Supra (1JZ-GTE) Major Problems
|
Mon, 26 August 2002 09:36
|
|
Mate i agree with Ginsie, it sounds like a crank angle sensor for sure!! My old VL Calais did the same thing for months before it finally died!! Trust me change it now if you can afford it cause you dont want to be stranded one day like i was.
They are usually very intermittent for a while before dying altogether. Everything else still works as you have already said just engine dies and will start after a while. The check engine light never came on in the VL either.
Jamie.
|
|
|
Location:
Forrestfield, WA
Registered:
August 2002
|
|
|
Yeah the ECU is coming out for sure this weekend... thanks to one of the earlier posts of got 2 complete wiring diags for the engine -> ecu, not its just a matter of following the physical cables and checking for signs of damage, faulty connections, corrosion etc.