Engine stall after throttle lift
#1
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Join Date: Mar 2011
Location: Eindhoven, The netherlands
Posts: 197
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Engine stall after throttle lift
So i got the car back running after 1.5 years, but with no turbo at the moment. My idle hunting is almost gone, just little hunting now, but my biggest problem is now when i lift the throttle after revving the engine stalls. Always. The idle valve does not do anything. If i let go throttle slowly and let the RPM drop slowly there is no problem
Is this because of those engine state settings? Like decelerating slowly or fast. I never looked at those settings because i tought they were only for dataloggging etc.
ive added a small datalog of one stall. The other ones are the same
EDIT: Biggest changes are electric waterpump and an electric hydraulic powersteering pump, but those thing should not be a problem.
Is this because of those engine state settings? Like decelerating slowly or fast. I never looked at those settings because i tought they were only for dataloggging etc.
ive added a small datalog of one stall. The other ones are the same
EDIT: Biggest changes are electric waterpump and an electric hydraulic powersteering pump, but those thing should not be a problem.
#5
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Join Date: Mar 2011
Location: Eindhoven, The netherlands
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Here is the currenttune
Some things are maybe way of i was only trying to pass inspection and could not drive it yet
i did drive thousand of kilometers with almost the same tune. And never had a problem like this if i remember correctly. Its a long time ago
Some things are maybe way of i was only trying to pass inspection and could not drive it yet
i did drive thousand of kilometers with almost the same tune. And never had a problem like this if i remember correctly. Its a long time ago
#6
Ok, I have a few ideas you could try. In your closed loop idle settings, I'd try making this change to the shift settings.
For this number of seconds:(s) I have a feeling your idle valve wasn't opening was because you were got above 2,000 rpm the ecu is now going to wait 2 seconds until it can open the idle valve again. Try setting this to 1 second or even less, maybe half a second. For reference, I looked at my tune, and I currently have that set to 0.1 seconds.
Hopefully, that will get your idle valve to open up sooner and catch the engine as it slows down. Your initial idle values look fine to me. I am not sure why it went really lean in the log you uploaded. It looks like you have wall wetting acceleration enrichment turned on. I would turn all of your acceleration enrichment off for now until you figure out why it is going lean on deceleration.
You can also play around with idle spark advance settings. You can set it up so that if your engine dips below target idle speed it will add a little timing to help catch it from stalling and raise the rpm again.
Hopefully, this gives you some ideas to try.
For this number of seconds:(s) I have a feeling your idle valve wasn't opening was because you were got above 2,000 rpm the ecu is now going to wait 2 seconds until it can open the idle valve again. Try setting this to 1 second or even less, maybe half a second. For reference, I looked at my tune, and I currently have that set to 0.1 seconds.
Hopefully, that will get your idle valve to open up sooner and catch the engine as it slows down. Your initial idle values look fine to me. I am not sure why it went really lean in the log you uploaded. It looks like you have wall wetting acceleration enrichment turned on. I would turn all of your acceleration enrichment off for now until you figure out why it is going lean on deceleration.
You can also play around with idle spark advance settings. You can set it up so that if your engine dips below target idle speed it will add a little timing to help catch it from stalling and raise the rpm again.
Hopefully, this gives you some ideas to try.
#7
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Join Date: Mar 2011
Location: Eindhoven, The netherlands
Posts: 197
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Thats a good idea about the number of seconds. Thats why it didnt stall on the drive to inspection. On a drive it is longer than 2 seconds. But only revving it for like 0.5 sec it has to wait 1.5 sec more to kick in.
good idea thx for that. Ill try it tommorow when im at the car
good idea thx for that. Ill try it tommorow when im at the car
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