LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Idle Issue

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Old May 24, 2011 | 11:37 AM
  #1  
tritonium's Avatar
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Idle Issue

After a search of the forums nothing seems to be the same issue - Sorry if this is a double post...

1993 LT1
Head/Cam Work CC 305/ stock trans / Ion Mad Tuner Tune / Hooker Shorty /

We Are Still Trying to get the car working correctly

ISSUE :

Idle Issue

Without A/C - when cold car will idle at 800RPM. When hot - 160degree or more - car goes through following cycle about every 2minutes

idle at 800 - then sounds like starving for air - then idle drops to about 500 and the sound of air rushing into intake varies- then idle kicks up to about 1200 - and slowly goes back to 800. Then repeats.

With A/C problem is worse.

When driving car and come to stop light - car idles fine, unless at 3 minute light - then starts above cycle.

WHAT WE DID

No vac leaks

Car seems in all good working order - temperature of all cyl constant on headers using infrared therm.

Cleaned all carbon out of TB and intake manifold - all clean-

we are going to try to use the stock chip tonight ?

NEW EGR

NEW IAC

READJUSTED VALVES ( by a pro)

TPS WORKING

Walbro 255

FORD SVO 30# Injectors
We are out of ideas

Last edited by tritonium; May 24, 2011 at 12:40 PM.
Old May 24, 2011 | 06:55 PM
  #2  
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Re: Idle Issue

disconnect an O2 and see if the cycling problem goes away when hot.
Old May 25, 2011 | 07:48 AM
  #3  
tritonium's Avatar
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Re: Idle Issue

Okay - found the issue -


I had my stock PCM module on backwards to the piggyback adaptor... I went back to using my PCM for Less tune with the stock module on correctly and she's back!

Had a little throttle cable sticking due to the car sitting for a while... some WD-40 and we're good.

Thanks!
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