WHat would make way too much fuel be dumped?
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Joined: Feb 2005
Posts: 198
WHat would make way too much fuel be dumped?
WOndering what components (sensors, etc.) would cause the PCM to make the injectors dump way too much fuel into the engine at a cold (open loop) idle as well as warmed up.
Thread Starter
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Joined: Feb 2005
Posts: 198
Re: WHat would make way too much fuel be dumped?
Actually, it was a WOT run that made the engine run extremely rich all the time....even at idle. Not running the car on the road until I get it fixed.
According to my Chiltons manual for my '97 LT1, there is a MAP sensor between the first 2 injectors.
When I read my codes, I didn't get a P0107 (MAP circuit low voltage) or a P0108 (Map circuit high voltage). I guess the MAP could still be bad even though it didn't throw a code.
According to my Chiltons manual for my '97 LT1, there is a MAP sensor between the first 2 injectors.
When I read my codes, I didn't get a P0107 (MAP circuit low voltage) or a P0108 (Map circuit high voltage). I guess the MAP could still be bad even though it didn't throw a code.
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Joined: Jul 2003
Posts: 1,035
From: Houston, TX
Re: WHat would make way too much fuel be dumped?
I would say check the readings on your O2 sensors, if they are burnt out this can happen or if you have an exhaust leak before the 02 sensors it will do it as well.
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Joined: May 1999
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From: Watertown, Mass
Re: WHat would make way too much fuel be dumped?
Also map sensors never break. It is the black thing with the green clip on the top of your intake. Though it may have clogged. It comes right out. You will see a hole on the bottem of it. Check there for any clogs.
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Joined: Oct 2003
Posts: 2,140
From: DOVER DE
Re: WHat would make way too much fuel be dumped?
Originally Posted by Red_94Formula
Also map sensors never break. It is the black thing with the green clip on the top of your intake. Though it may have clogged. It comes right out. You will see a hole on the bottem of it. Check there for any clogs.
A bad fuel pressure reg is a good possibility. Pull the vacume line and see if there is fuel in it or if it smell of fuel. The diaphram can rupture and fuel will get sucked into the engine through the vacum line.
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Joined: Feb 2005
Posts: 198
Re: WHat would make way too much fuel be dumped?
Hey All,
Thanks for the great suggestions on possible culprits. I'll definately check the regulator as well as the MAP. I'll be changing both pre-cat O2's this weekend (if they arrive by Uncle Sam). I'll keep everyone posted on what worked, what didn't.
Thanks for the great suggestions on possible culprits. I'll definately check the regulator as well as the MAP. I'll be changing both pre-cat O2's this weekend (if they arrive by Uncle Sam). I'll keep everyone posted on what worked, what didn't.
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Joined: Sep 2001
Posts: 308
From: Curacao (Caribbean Island)
Re: WHat would make way too much fuel be dumped?
Missfire can also dump a lot of fuel, cause the O2 sensor sees the missfired cylinder as a lot of air thus it thinks the mixture is lean, and it will add fuel to try and richen the bank the missfire is on.