Chevrolet S10,it has spark,fuel but no compression,what could this be?

Asked by mrodas345 Mar 16, 2020 at 11:14 AM about the 2003 Chevrolet S-10 Extended Cab RWD

Question type: Maintenance & Repair

I recently bought a used Chevrolet S10 2003 it
wouldn't start so I replaced the high output starter
motor and still wouldn't start then I recognized that
there was no compression and that the boots on
the spark plug wires were melted could you please
help I don't know where else to go from here thank
you

2 Answers

cjb108 answered 4 years ago

Off the top of my head, if the spark plug wire boots are melted and it has no compression, I'd say that your engine overheated severely and has, at the least, a blown cylinder head gasket. Let me suggest that you do a compression test on the engine. All cylinders should be over 100 psi and within 30% of each other. If any cylinder has lower than 100 psi, get an squirt oiler and squirt a couple squirts of oil in it then check it again. If the compression reading is noticeably higher, you've got bad rings. If it isn't, you've got a bad head gasket. Good Luck.

Mark helpful

GuruFZF5X answered 4 years ago

Lifters are stuck with sludge,replace lifters or take lifters apart and clean,inner plunger is stuck

Mark helpful

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