Rough Idle, Fuel Smell - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-15-2005, 08:43 PM   #1
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Default Rough Idle, Fuel Smell

92 bonne se probs with a rough idle and it smells like fuel at the engine.....i thought it might be the cat so i got it replaced and no help.

I checked for spark at all plugs and they all have a nice amount of spark......this is just at idle, but i can floor it and it will run nice, but it is guzzling gas like crazy.....im thinking somesort of fuel problem but i can't figure it out, i would take it to autozone but i havent got the time to wait in their long lines,

im trying so hard to fix it myself and avoid any more costly repairs, but it this car aint agreeing with me. Please help
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Old 11-15-2005, 08:58 PM   #2
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Mmmm, bad O2 sensor, leaky injector, leaky FPR... those are my ideas.

Pull the vacuum line off the FPR while it'* running, any fuel in the vac line? How about with it not running? Do all the plugs look the same?
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Old 11-15-2005, 09:17 PM   #3
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Describe your engine for us as either A or B:

A: No egr valve ported into the front exhaust manifold just before the crossover pipe, a Magnovox single one-piece ignition coil design, and an aluminum upper intake manifold under the engine cover.

B: Mushroom looking EGR valve just where described above, 3 distinctly different (seperate) AC Delco ignition coils on your ICM, and a black plastic upper intake manifold under the engine cover.

If your answer is A, you may have a burnt exhaust valve. The EGR-less engines were prone to this. However, I'd try John'* FPR check first, and inspect all 6 plugs.
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Old 11-15-2005, 09:37 PM   #4
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Or choice C:
3 seperate AC Delco coils and the tan painted aluminum upper intake.
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Old 11-15-2005, 10:06 PM   #5
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thanx for the quick responses guys, definate choice A the magnavox coil

1. FPR is that the chrome looking thing at the top of the engine? if so no leak of fuel with vehicle on or off

2. all the plugs were changed after the i changed the afore-mentioned magnavox coil along with wires

3. i cannot see any fuel leak at the fuel rails or top of engine after removing the tan cover....

4. where are the 02 sensors located? and would these cause the fuel smell and rough idlle, high fuel consumption?

it runs perfect at high speeds but at idle and slow speeds it is significantly slow......i wil do another check on this on thursday afte work as that is the only time i can have some daylight after work and school, i caught my finger in the fan today cause it was so dark i just reached in, not very smart....

please any suggestions
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Old 11-15-2005, 10:40 PM   #6
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I would check the fuel pressure regulator!
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Old 11-16-2005, 12:12 AM   #7
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Quote:
Originally Posted by realjwann
1. FPR is that the chrome looking thing at the top of the engine? if so no leak of fuel with vehicle on or off

The FPR is located IN the fuel rail. It has a vacuum line going to it. Is there fuel in it after driving?

2. all the plugs were changed after the i changed the afore-mentioned magnavox coil along with wires

What did the plugs LOOK like?

3. i cannot see any fuel leak at the fuel rails or top of engine after removing the tan cover....

You won't see a VISIBLE leak. It'* internal.

4. where are the 02 sensors located? and would these cause the fuel smell and rough idlle, high fuel consumption?

Yes, the SINGLE O2 on your car can cause this. It'* located in the top of the rear exhaust manifold below the strut bar. Looks like a spark plug. Buy an AC Delco unit ONLY.
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Old 11-16-2005, 03:37 PM   #8
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i went home for lunch today and looked for the FPR, only thing i saw with a vaccum line to it was a shiny top looking thing in the fuel line, so i removed the vaccum line while it was on and i saw no fuel, i waited while i turned the car off and no fuel came from this thing.

The car didn't want to turn on without having to give it a little gas at first, i will try to remove the plugs and o2 sensors later on today to see if that is the problem
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Old 11-16-2005, 03:38 PM   #9
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SINGLE O2 sensor. Not 2.

Your O2 sensor will start to get tired about 50-60k miles. It could be causing your problem. If you don't know how old it is, the best bet is to simply replace it.

Part numbers for O2 sensors are in Techinfo. Buy from www.gmpartsdirect.com
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Old 11-16-2005, 03:47 PM   #10
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I pulled the wiring off of the o2 sensor and it made no difference, now i dont know if should have or not but i tried that nontheless, i got no experience with this engine and it is killing me
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