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My 2000 Chevrolet S10 ZR2,




By outright on Jun 22, 2009

" "
My 2000 Chevrolet S10 ZR2, 147,000mile is miss firing and hesitating. Comes up with codes P0301, #1 cyclinder misfire and p0453. I took my truck to Chevy garage and they did a compression test, came back ok(120psi)in all cylinders. Had cyclinder leak down test proformed, 100% leak. I took the heads off when i did #1 push rod had some carbon build up. Had them sent to a machine shop, they were pressure tested and decked. They said heads were fine. I have replaced, Distributer and module,Distributer cap, Rotor button, Plugs & wires, Fuel injector assemlby/spider, fuel filter, air filter, egr valve, map sensor, airpump check valve, most vacume hoses,gaskets from the head up, and checked the timing chain. Do you have any idea's about what my problem is? Thanks
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Solution #1

posted on Sep 20, 2009
Not Rated)

The GQ

Rank: Master 
Rating: 0%, 0 votes
I have done a full engine replacement on these, a zr2 to be exact. I have found that a p0300 (multiple misfire) usually points the the Piece of **** injection spider, then I had a p0301 as well after replacing that with the multiport unit upgrade and found that the spark plug electrode folded over shorting to the center conductor.

Marc Reaves
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Solution #2

posted on Aug 18, 2009
Not Rated)

rigitbegood

Rank: Wiz 
Rating: 82%, 23 votes
Check the spark wire for the #1 plug. I had one get burned by the header, I would check it for burns or cuts. Sorry I couldnt help more.
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