1993 Corsica 2.2 liter Stalling when cold

[historystamp]

1993 Corsica 2.2 liter (VIN 4) LN2 carline with 130000 miles.


I Have A Corsica That Stalls When The Engine Is Cold. Looked For Broken Vacuum Hoses. That Turned Up Nothing. Once the engine has warmed up, after about 15 minutes, the car runs okay.


My friend replaced the coolant temperature sensor. Unfortunatley, that did not solve the problem. He has since put back the original sensor.


I and a friend are working on this problem. He also replaced the IAT and the MAP sensors and checked for vacuum leaks, again. None of these fixes helped.


So, let me describe the problem again. The car starts okay and when the engine is cold it idles rough. This is while it sits in the driveway. When I press on the gas in the driveway soon after engine start, the engine does not rev up. It hesitates for about 5 seconds then it revs up ( This symptom has mostly gone away ). If I'm driving down the road with a cold engine, this is a problem. When I slow down and then speed up, the car behaves like its almost going to stall. See first and second speed bump.


So, can you make other suggestions on what may be wrong with the car?
It's a 1993 2.2 liter (VIN 4) LN2 carline PFI 4 manual trans. A167.ds




The log contains a O2 warning. For the first time, I got the check engine light to go on. Was driving down interstate. Light lasted 15 seconds. Was about 10 minutes from start of car. Engine was warm before start. The error occurred before the start of this log.


Here is the log:
started car. revved engine several time. very minor hesitation once.
rolled in reverse down to street


6:04 ok Put in 1st gear to go forward
6:14 stalled just past the end of driveway


7:01 restarted
8:04 sniffling???
8:42 first bump Tends to nearly stall or almost stall at this point
9:26 second bump Tends to be a problem too
9:46 Stop sign to secondary road turned right


drove around my subdivision


17:00 possible speed bump


18:00 driving on a four lane road at 40 mph. noticed that loop had closed.

Robert

Happy Holidays

[EagleMark]

First your battery is no good, it's only 11.80 to 11.30 when car is not running, altenator is working because it goes up to 14.2 ish when running. Notice when you start yor battery voltage goes to 0 and data from ECM even stops then starts as voltage increases. Look at 0:18 and 6:59 in log. This is probably your start up running issue. Everytime you start you go to 0 voltage and clear any learn memory ECM had... ECM needs good voltage all the time.

Then you are in open loop way to long at start up while warming up, even when loop status goes "Ready" your still in open loop forever, BLM 128. Look at 3:19 loop status ready 90 degrees engine temp still open loop? Plus your O2 readings are off all over even in closed loop, not normal O2 Cross Counts, does bottom out when decelerating during DFCO like it should, you may have a bad O2 sensor. Look at BLM when finally went closed loop at 8 minutes, goes to 146 and stays there warmed up driving, it's always 146 (lean) even though INT is changing, BLM never moves, with other issues may be bad O2? Or bad ECM?

You have a code 44 set O2 lean so check fuel pressure and replace fuel filter. HTH!

[historystamp]

Thanks a bundle EagleMark.



I wish you all the best with the coming of the New Year.

My friend who helps me with car repairs is coming over today. We will have a lot to discuss. The battery is old. Lasted longer than most of the batteries that I have had in my car life.

Robert

[historystamp]

Replaced the battery with a Sears Dia-Hard. I like the name. With winter upon me, I thought it best to have a fresh battery. Still near stalling when cold. Will replace O2 sensor tomorrow, I hope.

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I am wonder about the IAC. The definition i found on IAC states:
IAC - Idle Air Control - (a controlled vacuum leak) A stepper motor controlled by the ECM. It determines how much air gets through to the engine when the throttle is at idle. The ECM controls it to maintain a programmed idle speed.

When I look at the monitor, the IAC is being adjusted all the time. Even when the loop is closed. The definition is a little misleading. My friend is wondering about the IAC being bad.

toddah mentioned a problem with his EGR. I am wondering about mine. Don't seem to have the info in my log. The egr info I have is in brown in the bottom graph.

( Picture were moved to a post below. )

[EagleMark]

IAc should change all the time, it controls idle... yes it could also be bad or plugged...

[historystamp]

IAc should change all the time, it controls idle...

I guess I do not understand what is the meaning of idle. I'd associated it with the car idling at a stop light.

I'm a beginner when it comes to working on cars.

Robert