Burning excessive gas - UPDATE w/Vid - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-28-2007, 04:00 PM   #1
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Default Burning excessive gas - UPDATE w/Vid

As you may know, my Fiero has a L67 out of a 94 Bonneville in it. Well today I started it to move it and the exhaust smells HIGHLY of fuel (i.e. running very rich), and the exhaust is barreling smoke. Is this is a possible injector stuck open? All I did within the last few days was change out the injector o rings, nothing else. Now also, my FPR line is kinda loose fitting, could this be the problem? I do have a old cat installed on it to quiet it down, but I know it isn't the cat causing this, as its a fairly new one off a 94 SSEi from a JY.
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Old 02-28-2007, 04:28 PM   #2
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Further diagnosis is that the PCV is covered with gas when i pulled it out, and there is a very strong smell of gas down where the PCV sits. I know this isn't right. Sounds to me like the FPR failed?
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Old 02-28-2007, 04:41 PM   #3
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Tested the FPR with a vacuum pump, Doesn't leak down, so FPR can be ruled out.
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Old 02-28-2007, 04:52 PM   #4
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OH NO! OH NO NO NO!

Can gas in the oil cause a spun rod bearing? I think I hear a slight clattering.

Why me?
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Old 02-28-2007, 05:19 PM   #5
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http://s102.photobucket.com/albums/m...t=HPIM0128.flv

Sounds like a possible knock. Could it be because of the thin, gas contaminated oil?
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Old 02-28-2007, 05:45 PM   #6
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I'm sure gasoline in the oil isn't a good thing but I think it would take a fair amount to do engine damage. Is the oil level high?
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Old 02-28-2007, 06:13 PM   #7
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Although not an L67 or GM for that matter, my gf'* rice rocket had a very similar problem. When started the car would barrel out smoke, also LOTs would come out while driving, it smelled like fuel and it was white. Through troubleshooting, we found that one o2 sensor wire was burned through from the exhaust.

New wire = Problem solved, this might be something you want to look at.
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Old 02-28-2007, 06:34 PM   #8
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Oil, Valvecover, sparkplug condition and dent in oil pan.
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Old 02-28-2007, 07:34 PM   #9
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Had that problem with an old Ford truck.

Was the fuel pressure regulator - usually located on the fuel rail

They can be tested. I don't know how
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Old 02-28-2007, 09:01 PM   #10
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Did you pull the oil pan and attempt to knock that dent out?

That dent may starve the engine a bit..

If the oil is fuel contaminated, it could cause bottom end damage, don't sound like you are there yet...

But it could cause the lifters to go flat if the oil gets too thin..

Did it do any better after new plugs and oil?

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