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1998 Chevy Astro Misfire #1 cylinder


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sara cheyenne
New User

Feb 26, 2011, 8:19 PM

Post #1 of 2 (2475 views)
post icon 1998 Chevy Astro Misfire #1 cylinder Sign In

Engine ran rough then was fine. Did it again and I pulled #1 wire from distributer cap and engine ran the same. Replaced wires, plugs, rotor and cap was fine for 1000miles. Same problem with #1 cylinder. Spark is good. Pulled plug and gas dripped off. Also gas coming out of exhaust. Repalced ignition coil, no change. (also replaced thermostat) All done on mechanic's advice. Told maybe map sensor? Easy fix. Question is why only #1 cylinder? Maybe vacum leak. Any ideas?
4.3L, 1998 Chev Astro, 2 WD,Replaced catalytic converter in the fall.


(This post was edited by sara cheyenne on Feb 26, 2011, 8:23 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 26, 2011, 8:29 PM

Post #2 of 2 (2467 views)
Re: 1998 Chevy Astro Misfire #1 cylinder Sign In

I think your next move should be a complete compression test then check the fuel pressure and see if the rest pressure holds when it's shut off.



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