I have a 2000 s10 with a 4.3 vortec I keep getting a p0303 cylinder 3 misfire I've replaced computer spyder with injectors map mas idel air cap roter wires the works help very frustrated


Asked by Aug 15, 2014 at 09:51 AM about the 2000 Chevrolet S-10 2 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

3 Answers


Compression test cylinder number 3. If it tests low that's why it's misfiring. Could be a burned valve, worn piston rings, or possibly a blown head gasket. HTH. -Jim

1 out of 1 people think this is helpful.

That was my assumption to so I cracked the heads off took them to my buddy's machine shop and sure enough Cylender #3 had the worst problem with the valve seats cracked in half.There were also 4 others that were bad. So I'm having a valve job done and having all new valve seats put in. Valve job $360 Fel pro head gasket set $50 new head bolts $25 miscellaneous $60 So for $500.00 it'll be like brand new. Now he had 6 other shops try to fix this for a total cost $1700 and none of then seceded. In closing just goes to show that paying a $90 per hr shop rate isn't always the way to go. Just a simple compression test that took maybe 20 min sese it all. Thanks Jim Troy R

1 out of 1 people think this is helpful.

You're welcome Troy. Glad to help. -Jim

1 out of 1 people think this is helpful.

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