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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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1g-gte missing
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Thu, 12 February 2004 10:37
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Ok well ive tried heaps of things and can't work out why the hell its doing it.
Comes on boost fine, revs perfect till it hits 5k rpm and starts what I feel to be missing. Its hard to explain it kinda goes on off on off with very fine jerks and the revs go up slower and power drops off. Im pretty sure its miss firing.
Ok ive recently taken all cooler pipes off and fixed a couple leaks, now idles lower, off a different motor ive user different speak leads, new speak plugs, different distributor cap and different coil. All to no evail.
What could it be?
I had it dyno'd and here are the graphs, as you can see it hits 5k and power goes flat.
http://members.optushome.com.au/gregmatt/dyno/
any ideas? its running pretty rich so I doubt its fueling. But maybe one of the injectors isn't performing well enough? could it still run rich like that?
Thanx heaps
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 10:40
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Check your fuel filter, my old Starion started doing that when the fuel filter was all blocked up (I'd just bought it). Would get to about 5k and start spluttering and the revs would go up slow...just a thought.
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 10:43
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Prolly one of these:
Fuel filter, regulator, spark plugs, spark leads, dizzy.
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 10:51
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Ill try a new fuel filter see what that does..
But its running rich.. how could it be lack of fuel?
same thought behind regulator..
plugs ive changed, dizzy cap ive put a new one on, leads ive put different ones on
...
its so annoying
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 12:54
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All turbo cars are mapped rich, mine would do exactly as you describe and use heaps of fuel when it finally came through. Spark plugs are a definite possibility also.
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Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 13:13
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| Ribbo wrote on Thu, 12 February 2004 21:51 |
Ill try a new fuel filter see what that does..
But its running rich.. how could it be lack of fuel?
same thought behind regulator..
plugs ive changed, dizzy cap ive put a new one on, leads ive put different ones on
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its so annoying
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HOW rich man ?? when i put my fuel helper system in... it ran fcking rich and kept flooding and stalling...
have u changed the fuel pump or similar recently ??? also watch the spark plugs as they will burn out or get heaps ogf carbon deposited on it once it runs rich
hope that helps
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Location:
Newcastle
Registered:
May 2002
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Re: 1g-gte missing
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Thu, 12 February 2004 19:47
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have you checked your rotor button, mine was cracked.
also my similar prob to this turned out to be a earth issue. the main earth bolt was a little loose so i got intermittant problems to the coil, igniter,computer... was very hard to find.
Cheers
Stew
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Location:
PNG
Registered:
June 2002
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Re: 1g-gte missing
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Fri, 13 February 2004 19:52
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Hi
May be a long shot but have you checked the engine diagnostics. The symtoms don't seem to sound right but it may be a loose plug to one of the knock sensors. The other option is the coolent tempature sensor may be faulty and the computer is still in cold mode. Your symtoms seem to point more towards this. If you think that this is likely have a look at the gallery - I think that I have got the diagnostics there. Otherwise drop me a line and I will look up the specification on the temp sensor for you.
Craig
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Fri, 13 February 2004 23:31
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thanx
yea im going to check the error codes, though I don't know how hehe
ive posted a post to work that out
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Location:
Adelaide
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 07:26
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I am getting the same problem with my 1ggte, I have got mine worked out to be something electrical,
if the headlights are on, or my thermo fan is running, it misses above 5500rpm, when these things are off it's fine, but my voltage on the battery is 14v so I dunno, I'll work it out soon, only time it annoys me at the moment is when I go down the strip cos the thermo is always on.
Brendon
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 11:25
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Let me know what you find.
My thermo is always on, never ran it without it.
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 13:07
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Have you measured the voltage at the ECU?
I've long suspected that my ECU doesn't get enough power...
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Location:
Brisbane
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 15:25
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Have you checked under the couch? I'm always losing stuff there.
OK I'm going to bed now.
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 19:16
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well nice to see norbie is here to save the day, all my problems are solved
What voltage at the ecu do you get Nark?
Im starting to wonder if it actually is missing or not, it seems to just be running a little rough on boost over 5k, what else other than missing could that be?
Cos I upped the boost a little and it didn't seem to be any worse, which I would of expected.
What does it feel like if the knock sensors retard the timing? does it just lose power?
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Location:
Madrid - Spain
Registered:
August 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 23:30
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1G-GTE Found
You were close Norbie, it was under the coffee table. 
Sorry, somebody had to say it.
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Location:
Brisbane
Registered:
May 2002
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Re: 1g-gte missing
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Mon, 16 February 2004 23:43
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ROTFL
That's brilliant! 
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Registered:
November 2002
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Re: 1g-gte missing
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Tue, 17 February 2004 00:00
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I agree - that is brilliant, and now I know what to do with my spare 1G-GTE motor in the garage.
I'm no expert in these engines but it sound to be like you have pulled an error code and the ecu is not switching over to its optimum mapping. Its running on its 'safety settings' second map. Low boost, restricted rev's.
Pull the code from it if you can, and or try pulling the ecu fuse for 30 seconds and resetting the thing.
Let us know how you get on.
Cheers,
Mitch.
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Location:
On your mum!
Registered:
May 2002
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Re: 1g-gte missing
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Tue, 17 February 2004 08:00
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When you tried defferent coils - were they new ones? and did you clean the spark plugs when you swapped coils?
I had endless amounts of nightmares with my car missing - Finally I bit the bullet and bought brand new coils (after swapping between some second hand ones) and finally after replacing the coils with new ones (oh and new ignitors coz I extra money to throw away  ) I took the car for a spin and it missed again - like nothing had changed.
After cleaning the plugs (AGAIN, and I had replaced them with new ones at least 4 times previous) it ran beautifully. I can only suggest that the plugs were fouled from the missing.
Like yourself, the missing in my engine was above 5K on boost. It is at this point that an ignition system has to work damn hard.
My remedy - new plugs and new coils. I will almost guarantee that the coils will be at the base of the problem.
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Tue, 17 February 2004 11:23
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I don't like the sounds of that Jason
I don't feel like replacing the plugs again as I got the stupid expensive iridium ones that were in the book for the 1g-gte, maybe a very light clean with fine sand paper?
If it was the ignition system wouldn't it brake down more under more boost? I upped it and didn't seem to be any worse.
Its like a very small miss, it seems to get better sometimes, thats why im starting to think maybe its not a miss....
Gotta get the computer error readouts, don't know which pins though to short
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Location:
On your mum!
Registered:
May 2002
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Re: 1g-gte missing
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Wed, 18 February 2004 00:24
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Another thing to consider Ribbo is whether there as any kind of coolant leak (either from the radiator cap or elsewhere)that may be spraying onto your ignition leads. I know that it is a long shot, but it will cause missing.
Maybe just clean the plugs with some carby cleaner and steel wool (rather than replacing them).
I seen you on Forest way yesterday. Looked like you were trying to Gee up a guy in a BMW Z3.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 1g-gte missing
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Wed, 18 February 2004 00:46
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looking at your torque and AFR graphs...
the torque drops off remarkably at about 4800rpm.. looks 'not good' (tm)
comparign directly against AFR, everything seems hunky dory until 3500, when you go from a little bit rich to 'buckets and buckets of fuel' (tm) 
10.5 is pretty bloody rich, and also helps to explain the misfiring... as the AFR gets richer, it gets harder to ignite. also as boost increases it gets harder to ignite, so you have two things workign against you..
i honestly don't know if your AFR graph is "normal" for a stock ECU, but if i'd paid someone to do it, i'd be looking for a refund .. or maybe it's just 'safely rich'?
Jason, what AFR's would you suggest?
Cya, Stewart
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Location:
On your mum!
Registered:
May 2002
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Re: 1g-gte missing
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Wed, 18 February 2004 00:54
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I'd suggest AFR's of 12.5 to 12.7 for max power. A weak spark signal will show up as being overly rich. No spark signal will often show as lean! (IE you cant get an AFR from unburnt fuel)
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Location:
Adelaide
Registered:
September 2003
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Re: 1g-gte missing
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Wed, 18 February 2004 01:56
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i read a report similar to your issue in a hot 4's magazine that they had an engine that started missing once they hit a certain amount of boost, they closed the spark plug gaps slightly and this fixed the issue.
i don't know much about this but i thought it might be useful to you.
just one thing you could try before getting new expensive spark plugs again.
don't close them too much cos it does sap power apparently.
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Location:
sydney
Registered:
March 2003
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Re: 1g-gte missing
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Wed, 18 February 2004 02:06
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the plugs will fire ok unless u run over 20psi
at std boost u should not be blowing out the spark
10.5 air fuel is rich but its still sort of ok
nissans used to run that rich from factory too
especially up hi and on boost
its just safer to run rich up high
saves blowing up engines
did u check for codes dont fuk round with it till u get the codes out of it if no codes then go looking for other stuff
r u sure its a miss
what boost r u running do u have a boost gauge
if u r overboosting the ecu will try shut the engine down
so make sure u have an accurate boost gauge
if u get over 12psi it might hit boost cut
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: 1g-gte missing
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Wed, 18 February 2004 12:38
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ok well codes were 24 and 42
42 is speedo, which is fine cos its not hooked up to computer.
24 on the other hand is intake temp sensor..
I reset the computer and went for another run and it now reads no errors...
problem is still there though
no problem making boost as I wound it up and hit 15psi once, which i wound back down cos i didn't mean to send it so high hehe
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Location:
south east - melbourne
Registered:
March 2004
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Re: 1g-gte missing
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Mon, 22 March 2004 04:03
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mate just chek that ur ecu connections are fited in properly this can cause certain cars to run ok till certain rpm and miss like mad when they get to certain rpm and run like its detonating and misfiring sopull the ecu connections out put some wd 40 in there and put it back ad see if that helps happened to my nissan exa b4 always and thats was the only fix for it
cheers
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