I had to change the timing chain since it skipped and was stretched. the spark plugs, wires, solenoid, distributor, rotor, cap, fuel injectors, fuel filter, intake gasket, valve cover gaskets, water pump and now it still reads code PO300 multiple misfire. I did the compression test and there isn't any compression in cylinders 2 and 5. The other cylinders are low on compression as well. what else can i do? do i need to have it rebuilt or replaced. what kind of price range would i be looking at for this type of repairs?
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1998 GMC 1500 Pickup Question: engine compression
Answer #1torque wrench from Stewart's Auto Repair LLC, January 15, 2011, 17:41Master
do a wet compression test, to see if the problem is in the head or rings. If the compression values rise after you ad oil to the cylinders the problem is in the rings and needs to be rebuilt. if it don't change the problem is in the heads, valves or head gaskets. you would need to do a leak down test to pin point the prblem. Try this first and lets hear your results
ReplyIRB13007, January 15, 2011, 18:28Rookie
How do you do the wet test? I haven't done one before. I am not sure what to do.
Replymastertech6371, January 15, 2011, 19:59Master
apply a small amount of oil into the cylinder to seal the rings and re do the compression test.