Help 1991 tpi Idle
Thread Starter
Instructor
Joined: Mar 2006
Posts: 131
Likes: 0
From: San Bernardino California
Help 1991 tpi Idle
So I start the car .. go to back up .. and it shut off... said "sys" where it normally displays the range.... now ... when the car is warm ...it surges at idle ..and idles roughly ... sorry this is my first time in the c4 forum.. normally im havin problems with my c3 
any ideas ... 91 tpi
any ideas ... 91 tpi
Thread Starter
Instructor
Joined: Mar 2006
Posts: 131
Likes: 0
From: San Bernardino California
Car has no modifications.. lots of miles.. but runs strong .. auto trans...has always had a slight off idle hesitation since i got the car.. now once it gets warm it surges almost as if it wants to shut off... checked all the plugs .. and spark is there .. cant find a vacuum leak ... anyother ideas.. what would cause the rough idle at operating temp .. and the minor hesitation off idle
Thread Starter
Instructor
Joined: Mar 2006
Posts: 131
Likes: 0
From: San Bernardino California
Sorry im just learning on these computer controlled cars .. i have always dealt with the classics.... I just read a thread on how to read the codes and I will try it tomorrow and post my results >> 
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Thread Starter
Instructor
Joined: Mar 2006
Posts: 131
Likes: 0
From: San Bernardino California
car is stock .. bought from my fiance's dad ..soon to be father in law ..so i trust him .. i have drove it for about 2 months with no problems .... but it has always had a slight off idle hesitation .. and now its getting worse .. once its warm sometimes it sounds like it wants to die .. Father in law says he recently replaced the injectors and o2 sensor...
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
For the idle, a good throttle cleaning might be in order including the IAC if it hasn't been done recently.
Is the SES light on with the code 32? If not it might have been out of range for a moment. Reset the ECM and see if it comes back.
Is the SES light on with the code 32? If not it might have been out of range for a moment. Reset the ECM and see if it comes back.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by alotaball
just checked it... code 32... what should i do first
RACE ON!!!
Thread Starter
Instructor
Joined: Mar 2006
Posts: 131
Likes: 0
From: San Bernardino California
Reset the ecm .. now it seems to have gone away .. sounds good drove for maybe 20 miles... still has a slight missfire at idle .. hardly noticable.. but for a 147K ill be happy if it stays like this till i rebuild it ... give it a couple more days and see if my problems come back .. thanks for all the help
Safety Car
Joined: Oct 2005
Posts: 3,545
Likes: 17
From: Bartlett Tennessee
91 Idle
I had similar problem. My 91 started to suddenly have a rough idle then when you put it in gear it would die. Suddenly the rpms started to flucuate and where you normally see your avg mpg on the left of your mph indication sys code started flashing and the service engine soon alarm came up in the message center . To make a long story short the computer shorted out and burn't the pins in the distrubitor cap and rotor button and also burn't up two plug wires !!!!! After replacing these the Vette runs smoother than ever and the ever so slight miss is gone and my MPG is back to normal !!!!
