Car stalling when a/c is on

[FRS13_]

Car started randomly stalling today while at low rpm in 1st gear and a few times at stop lights while in neutral.

I noticed it happens when the a/c is on, I turned off the a/c and the problem ceased.

I had my clutch replaced just yesterday, not sure how it would be related if it happens when the car is in neutral.

What y'all think?

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[humfrz]

Originally Posted by FRS13_

Car started randomly stalling today while at low rpm in 1st gear and a few times at stop lights while in neutral.

I noticed it happens when the a/c is on, I turned off the a/c and the problem ceased.

I had my clutch replaced just yesterday, not sure how it would be related if it happens when the car is in neutral.

What y'all think?

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Are you getting any codes?

It may not be related to the clutch.

If the battery was disconnected for the clutch work, the ECU may just be re-learning stuff. I'd give it a few hours/miles to settle in.


humfrz

[FRS13_]

No codes.

Come to think about it I haven't driven the car much since the clutch was replaced, maybe it is just the ECU relearning and nothing more.

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[JBezugs]

Originally Posted by FRS13_

No codes.

Come to think about it I haven't driven the car much since the clutch was replaced, maybe it is just the ECU relearning and nothing more.

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If the issue doesn’t go away over time there is an idle relearn process. I had a problem with my idle after tuning with random drops and surges where the car would almost stall (as the ECU gets reset after flashing a tune), and this fixed it:

As I recall (very high level)

- Disconnect battery for 10 mins.
- Reconnect battery.
- Put car into ON position for 20 seconds, not starting it. This allows the car to calibrate sensors, etc.
- Turn car OFF and wait a few seconds.
- Put car into ON position for 20 seconds again.
- Start the car and let idle for 10 mins. This will let the ECU figure out the throttle calibration for a smooth idle.
- Turn off the car for a few mins.
- Start it back up and drive around!

That should fix your issue.

[FRS13_]

Originally Posted by JBezugs

If the issue doesn’t go away over time there is an idle relearn process. I had an issue with my idle after tuning with random drops and surges where the car would almost stall (as the ECU gets reset after flashing a tune), and this fixed my issue.

As I recall (very high level)

- Disconnect battery for 10 mins.
- Reconnect battery.
- Put car into ON position for 20 seconds, not starting it. This allows the car to calibrate sensors, etc.
- Turn car OFF and wait a few seconds.
- Put car into ON position for 20 seconds again.
- Start the car and let idle for 10 mins. This will let the ECU figure out the throttle calibration for a smooth idle.
- Turn off the car for a few mins.
- Start it back up and drive around!

That should fix your issue.

Thanks, sounds pretty straightforward. I'll give it a try in the morning and report back.

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[WNDSRFR]

Originally Posted by JBezugs

If the issue doesn’t go away over time there is an idle relearn process. I had an issue with my idle after tuning with random drops and surges where the car would almost stall (as the ECU gets reset after flashing a tune), and this fixed my issue.

As I recall (very high level)

- Disconnect battery for 10 mins.
- Reconnect battery.
- Put car into ON position for 20 seconds, not starting it. This allows the car to calibrate sensors, etc.
- Turn car OFF and wait a few seconds.
- Put car into ON position for 20 seconds again.
- Start the car and let idle for 10 mins. This will let the ECU figure out the throttle calibration for a smooth idle.
- Turn off the car for a few mins.
- Start it back up and drive around!

That should fix your issue.

Last time I had a CEL (only time actually) I cleared the code with the OFT and when I started the car it would barely run. I had to hold my foot on the gas to keep it running. After a couple minutes it settled down and ran almost normally. I guess it was still learning for the next couple days because whenever I would come to a stop the idle would dip so low it would almost stall. It's finally completely back to normal.
Next time I have a CEL (never I hope) I'll try this procedure to save me some grief.

[tobin]

IIRC wasn't there an ECU reflash service bulletin related to this?

http://www.ft86club.com/forums/showthread.php?t=21868

S-SB-0040-13 : Intermittent RPM Drop

[Tcoat]

Originally Posted by tobin

IIRC wasn't there an ECU reflash service bulletin related to this?

http://www.ft86club.com/forums/showthread.php?t=21868

S-SB-0040-13 : Intermittent RPM Drop

That only applies to the AT and is a TCM not an ECU flash. Right symptoms though.

[FRS13_]

Originally Posted by JBezugs

If the issue doesn’t go away over time there is an idle relearn process. I had an issue with my idle after tuning with random drops and surges where the car would almost stall (as the ECU gets reset after flashing a tune), and this fixed my issue.

As I recall (very high level)

- Disconnect battery for 10 mins.
- Reconnect battery.
- Put car into ON position for 20 seconds, not starting it. This allows the car to calibrate sensors, etc.
- Turn car OFF and wait a few seconds.
- Put car into ON position for 20 seconds again.
- Start the car and let idle for 10 mins. This will let the ECU figure out the throttle calibration for a smooth idle.
- Turn off the car for a few mins.
- Start it back up and drive around!

That should fix your issue.

I followed your instructions and the car is no longer stalling. Very helpful info, thanks!

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[JBezugs]

Originally Posted by FRS13_

I followed your instructions and the car is no longer stalling. Very helpful info, thanks!

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Glad to hear it! Enjoy the new clutch!

[cvondra]

Is your car still running fine after the relearn? Dealing with similar issue for a long ass time. Going to try this method but just curious if it 'stuck' or if the relearn process becomes a neccessary frequent thing.

[FRS13_]

Originally Posted by cvondra

Is your car still running fine after the relearn? Dealing with similar issue for a long ass time. Going to try this method but just curious if it 'stuck' or if the relearn process becomes a neccessary frequent thing.

It worked fine until i installed uel headers and oft stage 2 tune like a week later and it started happening again. I did the same procedure again, the first time I tried it didn't work (my timing was off), tried again and worked just fine.

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[cvondra]

My pattern is once I hit ½ tank of gas it starts to get wonky and gets worse as tank drains to light. Refill with petrol and issue goes away. Using the Full Blown Walbro 485 pump kit. Bad fuel pump? Fuel pump over heating? I know the obvious answer for resolution is don’t let it get below ½ tank……that’s a PIA in the long run. Trying to find a better resolution.