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Engine Missing... good spark though.

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Old Apr 4, 2002 | 08:27 PM
  #1  
87LB9B4Z's Avatar
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Joined: Mar 2001
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From: Texas
Car: See ID
Engine: See ID
Transmission: M39
Engine Missing... good spark though.

My IROC appears to be missing a cylinder - or at least a part of one

While the motor idled I disconnected each spark plug (at the cap since we all know doing it at the spark plug just gets you burned) and noted a marked increase in roughness for each wire. Every plug wire removed impacted idle quality. So where's the miss?

Each fuel injector is firing (clearly heard and felt). The miss becomes quite noticeable above 2,000 RPM and stays throughout the RPM range.

Traced the plug wires... no noticeable breaks/burns.

Plugs have less than 20K on Bosch Platinum.

I've not done a compression check.
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Old Apr 5, 2002 | 07:10 AM
  #2  
RB83L69's Avatar
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Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Replace the spark plugs. If they don't work, then it really doesn't matter how long or short of a time they've been in service.
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