Please help, car is ultra rich(long)
Thread Starter
Teching In
Joined: Nov 2001
Posts: 24
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From: palatine,IL USA
Please help, car is ultra rich(long) Car was stored in garage from nov. to jan. In late January I took it out on a 60 degree day and it ran perfectly. I did have to jump the battery. The next day I took it out again, and I was low on gas. I went straight to a Citgo station and put about 6 gallons of 93 in. About a half mile from the gas station, the car began to chug and stumble. I pulled over, shut it off, and restarted it. It idled rough, so I shut it down again. I pulled the fuses for the pcm, thinking that resetting it would help, but it didn't. Since then I've tried to start it several times, but the problem still exists. I am not getting any dtc's. The short term fuel trims get to about -38% within a minute of cold start. The o2 sensors read about .595-.600, and they don't fluctuate as they normally would. The iac pintle position is high (178+). I've sent the pcm to Ed Wright and was told it was fine. I swapped in a different maf sensor and that didn't change a thing. I was thinking I got a bad batch of gas, so I tried to siphon the gas out, but there must be some baffles inside the tank. Then I tried to use my in line pump to empty the tank, but it must not be able to pull enough fuel when the in tank pump is not running. Now I'm starting to doubt if anything is wrong with the gas. Could both o2 sensors have gone bad at the same time? Without setting a dtc? I'm getting desperate here, has anyone seen anything like this? My car has heads/cam and several bolt ons. I don't think the problem is mechanical. Thanks in advance.
Chris
Chris
Re: Please help, car is ultra rich(long) Chances are that if your o2 sensors weren't flipping correctly then you would get a DTC...it sounds like bad gas to me.
Pull the feed line off at the rail and run power to the pump.
Sounds like a load of bad gas to me...
Scott
Pull the feed line off at the rail and run power to the pump.
Sounds like a load of bad gas to me...
Scott
