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| Eclipse Problem Diagnosis Got a problem you can't fix? Post here and one of our members will answer as soon as possible. |
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#1
11-25-2008, 09:59 PM
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idle issue
ok so my 96 eclipse started not holding idle. it would die at idle occasionally and you had to hold the gas when you started it or sat at a red light. i talked it over with my mechanic and he reccomended starting with the iac. i changed it this weekend and it worked fine untill today and it started dieing at idle again. it hasnt thrown a cel and doesnt do it consistantly. also, when the battery is disconnected for a short period of time and then reconnected, it runs fine for a few days. any ideas where to go next?
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 yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest 
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#2
11-25-2008, 10:01 PM
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Re: idle issue
sorry wrong forum......
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yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#3
11-25-2008, 10:45 PM
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Re: idle issue
Moved.
The IAC would be my first guess. Check the resistence in the iac motor to make sure your new one hasn't gone bad already. That will rule that problem out. Maybe clean the TB, the front o2 sensor could have an effect on your idle as well. However it should throw a cel if it was bad.
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98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#4
11-25-2008, 11:01 PM
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Re: idle issue
i would have to say tps or real small vaccum leak. or you may want to get some cleaner for the housing and maf. don't use carb cleaner use the real cleaner you use for that it's made for that and autozone or advanced have it. even any store that sell automotive products. add sea foam also.
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#5
11-26-2008, 10:11 AM
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Re: idle issue
He has a gs, 420a motor so no maf. A vac leak would cause it to idle high not die out.
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98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#6
11-26-2008, 10:19 AM
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Re: idle issue
how would i go about checking the resistance in the iac?
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yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#7
11-26-2008, 10:32 AM
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Re: idle issue
Volt meter. I would suggest you invest in a shop manual for your car. That was one of the first things I bought and it helps out a lot as far as things like this. Its only like $10 at advance or something. The manual will tell you what the resistence is suppose to be.
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98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#8
11-28-2008, 05:05 PM
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Re: idle issue
i stopped in at the local mitsubishi dealership to ask some of their techs about what path i should follow on my idle issue. they advised me to clean the throttle body and computer grounds. if neither, they think my computers fried..... this is gonna be a long weekend, ill keep ya posted
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yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#9
11-28-2008, 06:43 PM
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Re: idle issue
I wouldn't be jumping to conclusions about the ECU being bad. While its possible that could be the problem I would be betting on a problem somewhere else. Most of the time when ECUs go out that make the car do random things, not just screw up the idle.
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98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#10
11-29-2008, 10:36 AM
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Re: idle issue
i need to check the grounds tonight, that could explain why the cel codes arent being held and when the battery is unhooked and then put back in it runs fine for a few days.... need more time off from work
 opcorn:
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yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#11
12-02-2008, 04:07 PM
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Re: idle issue
so far ive replaced the iac, cleaned the throttle body, and replaced a cracked vacuum hose.... still not holding idle. im goin to a friends shop 2nite to have it hooked up to a scanner, hopefully its somethin small and stupid ive overlooked
__________________
yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#12
12-03-2008, 09:07 PM
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Re: idle issue
had my mechanic scan it, turns out the o2 sensor was reading 0.5 constantly....
__________________
yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#13
12-05-2008, 03:39 PM
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Re: idle issue
front o2 sensor seems to have fixed the idle
thanx silvreclipse, you called it.
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yea, id say its low 96 eclipse gs, custom ram intake, 4:1 header, no cat, straight through muffler, 2'' lowering springs, rear interior removed and replaced with false bottom, kenwood deck, lightning audio fronts, pioneer rear, rockford fosgate punch series 600w class d mono amp, alpine type r 12'' sub- hit 131.3 at the passenger head rest
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#14
12-05-2008, 04:32 PM
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Re: idle issue
Quote:
However, I need to clarify the above quote. When you disconnect the battery, the ECU is reset, erasing all saved codes and resetting all settings back to normal. Like you said, the O2 was bad and the car ran fine with just the reset. It's running tests on it's self and I heard it takes about 50 miles or 2 hours of continual driving (or idle) in before the car starts making the adjustments and running in an open loop. When it's first connected though, it's running on how the car was programmed to run, not running based on it's surroundings. That's also why it's technically good to reset the car each time you add any mp-worthy mod. Hope that makes sense.
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2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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