furia

'01 LS1 Firebird in '87 Monte
Starts and runs great, but when it gets up to 80-90 C it wont idel properly, and sometimes dies.. When driving, no problem until I hold the same speed and rpm for a few sec. It sounds like its running way to rich. Change speed and rpm its back to running great, until Im back to crusing at the same speed.
Any ideas?
No errorcodes, and no check engine-light btw

68Hybrid

i had that issue-- no codes, but it turned out to be my O2 sensors. Try popping them out for a quick inspection.

Old Geezer

iTrader: (3)

Time for a data log.......Looking at the sensors will tell virtually nothing. A data log will help.

davidws6

iTrader: (36)

I also had the same issue. Turned out to be Right O2 sens.

Few days prior, I remember driving through an area where there was lil bit of water ( + - 4 inches ) close to the R curb. Toasted the R sensor.

Use ur scanner n see if Ur O2's are toggling. If not, Log some data.

casias

iTrader: (1)

Not really a lot of information about your build. But I had that trouble initially on my LY6. Check the fuel trims. They will tell you if it is one side or the other, or both.

Mine was a combination of a small exhaust leak on one side above the O2 sensor, and the MAF sensor in a bad part of the intake without a good 4 inches of laminar flow.

furia

Thnx! I'll check my O2's datastream But are they weak for water? So i schould concider moving them to a dryer place? They are located pretty near the road today..