sata3000

Alright guys just looking to get some advice. Since the weather has gotten hot I'm having a hot start/idle issues.Happens when the car is hot. 80-95 degrees ambient temp outside. The car will be hot. I'll park for 5-20 min come back to the car and fire it up and she wont idle. I find myself at stop signs pulling up my e break and giving it throttle to keep it running. Once I drive the car for 150 yards it seems to idle fine for about 1 min then the rough idle returns and I'm holding my e break again.PTuning seems to believe I'm having a vapor lock issue. So I decided to park with my hood open and let it sit for about 20min. Go to restart and the issue it still there. Any ideas?Troubleshoot?

japhethwar

I would think this would be tune related, no? I don't think fuel injected cars can vapor lock, that was only an issue on carbureted cars with mechanical pumps to my knowledge. If your fuel is getting hot enough to boil i'd be seriously shocked. What ambient temps were you tuned at? Most likely the temps are causing a overly rich or lean condition at low rpm's. Could be an issue with the iac valve, but i'm gonna say it's most likely the tune. Do you have a wideband? What's it reading when your having these issues?

indi00

Tune related.

http://forums.evolutionm.net/aem-ems...e-aem-ecu.html

sata3000

During the issue im running lean. 15-17 af when idle is rough so the af bounces

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s2000442

Try adding more fuel at idle and see if that helps

camuman

its def in the tune. there are offset tables for this stuff in the advanced fuel map.

Forcedbird

I am stumped on this one because I haven't researched or ran into this problem myself. It would make sense that it could be the tune. Bump for you buddy.

urBan_dK

With the location of your air filter in that profile picture, chances are good it is heat soak related.

s2knoob89

You can clean the throttle body and IACV to rule them out. Is your AC on when this happens? If it is you can try adding more load compensation. My car would idle in the 16-17 afr range on a hot start up but it never tried to die on me so I don't think adding more fuel is going to help.

camuman

you need to look outside the box when trying to solve this problem. remember, many factors influence your tune. and many variables can be tweaked to fix your problem. i have had a few problems here and there, turned out 99% of them were tune related, not failed parts. be patient, have computer connected to car and duplicate problem, then watch what the tune is doing, and what offset tables are influencing that situation.

it will then jump out at you and bam, be fixed.