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irratic idle and stalling/ have no clue

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tes87gn

Member
Joined
Jun 7, 2001
Messages
160
just did a few upgrades cam lifters springs polished intake upper plenum 70mm throttlebody trans rebuild and 2800 stall. i just got the car running after one aggravating headache after another and it seems to run really strong but the idle at times get very irratic sometimes high sometimes low i've tried adj. tps and iac nothing seems to be working. also when i go to WOT and let off suddenly (example when in town doing some showboating from light to light;) ) my car continuously wants to cut out unless i feather the throttle alittle it will do this almost all the time. the more perfomance parts i've been adding this problem has progressively gotten worse. it seem that for some reason the more partsi put on to help spool up or increase the volume amount of air into the engine now when ever the throttle close after some boost the engine shuts down.:confused: please help this is quite embarassing to have a bad ass car that stalls when trying to twist some air.:(
 
Bad MAFs?
Is there screens in the mafs

Egr, or egr solenoid filter? Might plug the line to the valve and see if it makes a difference.
 
are you supposed to have screens in the MAF...i have 1....mine does this also..
Sleeper87
 
Yes, most cars run ok with 1 of 2 screens removed, some even are ok with no screens(mine didn't like it.) Also, it's important that the screen, or sreens, are in there straight too, otherwise it distorts the airflow across the sensor.
 
Disconnect the MAF and start the car. If the idle is okay the problem has been found.

With Plenum chanage, how is the IAC motor? Might try to clean the IAC motor/sensor with some O2 safe carb cleaner. Also there should be a gasket between the IAC sensor and the TB.

What are the IAC readings at idle? I believe they should be around 10-20 in Park.

When I was running the Thrasher chip it did not like have the screens removed and the Thrasher documentation said to leave them in unless the car is drawing some major air. In that case you probably won't be running a Thrasher chip.

HTH
 
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