Hey guys, I'm hoping I can get some advice to cure my rich starts. It only happens when the car is warm, but basically fuel is likely pooling when I try to start the car when the engine is warm; a black cloud of smoke puffs out the tip when I start it and it wants to die for a second then its fine.

I'm assuming I'll have to adjust idle tables, but I'm having a hard time understanding how I should be adjusting it so that it doesnt start lean when the engine is cold. Myabe theres some table that I'm missing that controls fuel vs engine coolant temp or something? BTW my cold starts are fine, no issues there... Thanks



" To study and not think is a waste. To think and not study is dangerous. "

Do you have a wideband hooked up? If so what is your AFR's when this happens?



FU Tuning

I am more interested in AFR when shutting off when warm, at idle in closed loop.

Are you running VERY rich at idle, could it just have some left over fuel waiting to go in??

I had a problem close to that... my car would start fine in the morning but if the car was warm it would start really rich. turned out to be the FPR... you might want to look into that


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John Benham: The AFR when I shut the car off is usually at 14.9-15.5 with no sudden dips so I doubt that is the issue but not a bad guess, it was something I hadn't thought of.

John Higgins: I do have a wideband, I can only get data from HPTuners since my Innovate will not display for the first few seconds after I turn the car on (even if the sensor has gone through its warming cycle). I'll post up a lot, but basically it is very rich (9's-10's) momentarily from what I can read from HPTuners.

Robert Williams: I'll look into it, I've read they're pretty reliable... any suggestions to check and see if its bad?


One thing that I'm thinking may be a problem is my IAT sensor is currently not in the piping and my PCV is venting to atmosphere after my catch can... I'll put those on the to do list for the weekend but I'm not sure if that will be of much use. Any other suggestions?



" To study and not think is a waste. To think and not study is dangerous. "

pull the vacuum hose off the manifold that runs to the fpr and see if fuel pours out of it. If so the the diaphram inside it is bad and its pouring fuel back In the manifold


www.rdracing.110mb.com

Thanks man I'll try that tonight if I can squeeze in some time with the car and let you know how it went



" To study and not think is a waste. To think and not study is dangerous. "

I forgot to add in while the car is running and just put a vacuum cap on the manifold


www.rdracing.110mb.com

Hey Robert, pulled the line off tonight and no fuel at all... I'm still leaning towards a tuning issue.



" To study and not think is a waste. To think and not study is dangerous. "

I've never seen an ecotec VCM via HPT before... but from my readings of the HPT forums... does the ecotec not have a "Startup" VE or startup Spark table?

-Chris-



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