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 Misfire at Idle

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87TurboT
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PostSubject: Misfire at Idle   Mon Jun 27, 2016 8:41 pm

Recently my 96 has been running rough at idle and I hear a faint ticking noise coming from the drivers side. (thinking EGR tube is cracked). Put a scanner on the car and I got the following codes: P0171, system bank 1 lean, and code P0300, random misfire. The car runs great otherwise, and once warm the idle isnt as erratic as a cold start. The vehicle has 188k on it at the moment.

Here are the things ive done to narrow down the issue:
Replaced all of the plugs (which needed to be done anyway)
Fuel Filter (which needed to be done anyway)
Checked Fuel pressure with a gauge (around 45 at idle, increases with rpm/boost)
Swapped around coils
Checked plug wires for rust, all looked good
Cleaned MAF

Is there anything I am missing here with the exception of changing the plug wires?

Thanks!
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albertj
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PostSubject: Re: Misfire at Idle   Tue Jun 28, 2016 2:18 am

codes need to be fixed but may not relate to the ticking. Ticking could be just the injectors, normal injectors may tick kinda loud. The lean condition, I wonder if you have a bum injector.

OK Riv People, any other thoughts?

Albertj
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87TurboT
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PostSubject: Re: Misfire at Idle   Tue Jun 28, 2016 4:51 am

Sounds more like an exhaust leak than injectors cycling. My thinking is wouldn't a cracked/leaking egr tube cause a lean condition? Since the vehicle is getting air into the motor after the maf that is not being accounted for? Thats my train of thought at the moment. Also, all of the vacuum hoses look to be in good condition/are all connected.
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albertj
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PostSubject: Re: Misfire at Idle   Tue Jun 28, 2016 9:34 pm

87TurboT wrote:
Sounds more like an exhaust leak than injectors cycling. My thinking is wouldn't a cracked/leaking egr tube cause a lean condition? Since the vehicle is getting air into the motor after the maf that is not being accounted for? Thats my train of thought at the moment. Also, all of the vacuum hoses look to be in good condition/are all connected.

Old rubber vacuum connectors leak. The telltale is if they are hardened.

Wires might or might not make a difference.

How long have you owned this car? Maintenance?
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87TurboT
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PostSubject: Re: Misfire at Idle   Tue Jun 28, 2016 9:50 pm

Trust me I know all about vacuum lines.. the grand nationals have miles of them! I've owned the car almost 2 years. The gentlemen I bought the car from owned it for 9. Ive done pretty regular maintenance on the vehicle.
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87TurboT
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PostSubject: Re: Misfire at Idle   Wed Jun 29, 2016 11:05 pm

I take back my previous statement. It WAS a vacuum line on the passenger side of the supercharger, just behind the pulley system. I am assuming it is a boost reference line going to the MAP sensor. Looks like it slipped right off, I zip tied it for good measure.
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albertj
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PostSubject: Re: Misfire at Idle   Thu Jun 30, 2016 9:20 pm

87TurboT wrote:
I take back my previous statement. It WAS a vacuum line on the passenger side of the supercharger, just behind the pulley system. I am assuming it is a boost reference line going to the MAP sensor. Looks like it slipped right off, I zip tied it for good measure.

once again take a hard look at those vaacline connectors.
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sloshua
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PostSubject: Re: Misfire at Idle   Tue Jul 05, 2016 7:00 pm

I use permatex Hitack on the ends of the vac lines, the stuff never dries or hardens and stays where its applied.
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