Misfire

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Sep 6, 2006 | 06:55 PM

90IROC305

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Junior Member

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Joined: Sep 2005

Posts: 52

Likes: 0

From: NOVA

Car: 1990 IROC-Z

Engine: lb9

Transmission: t56

Axle/Gears: 3.73

Misfire

My 1990 Iroc with a 305 tpi has a miss at about 4000rpm. I have checked compression, spark, and fuel. I have also had a shop look at it. Everyone is stumped can anyone help me out?

Sep 6, 2006 | 09:49 PM

ProjectIrocZ28

Junior Member

Joined: Mar 2006

Posts: 79

Likes: 0

From: Center Valley, PA

Car: 88 Monte Carlo

Engine: 305

Transmission: Auto

Axle/Gears: Really Tall ones. Probably 2.73's

how old's the fuel filter??

Sep 7, 2006 | 07:02 PM

90IROC305

Thread Starter

Junior Member

iTrader: (3)

Joined: Sep 2005

Posts: 52

Likes: 0

From: NOVA

Car: 1990 IROC-Z

Engine: lb9

Transmission: t56

Axle/Gears: 3.73

fuel filter is brand new. and there is no clogging in the fuel system.

Sep 7, 2006 | 07:19 PM

taonindo

Banned

Joined: Jun 2004

Posts: 405

Likes: 2

Car: 82 firebird

Engine: 406

you dont mention the milage or amount of abuse...but could the valve springs be weak?....tao

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