Busted rings or valve issues.Originally Posted by deadsnake
Run some SeaFoam through it if you haven't already. Some people have carbon buildup on the valves and the SeaFoam seems to cure it. It's worth a try.
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07-12-2012
Busted rings or valve issues.
Run some SeaFoam through it if you haven't already. Some people have carbon buildup on the valves and the SeaFoam seems to cure it. It's worth a try.
07-12-2012
What is the procedure for seafoam
07-12-2012
If it's naturally aspirated then just dump it in the master cylinder vacuum line. You'll have to keep the RPM's up though so it doesn't stall.
07-12-2012
Where is that located ?
07-12-2012
It's the large neoprene line that goes from the back of the UIM to the brake master cylinder power assist.
07-13-2012
Its odd. It misses at low rpm. At high rpm its steady and doesn't miss. Sea foam didn't help
07-13-2012
Did you put SeaFoam in the oil yet?
It might just be sticky valve guides.
A cylinder leak down test may tell you if the rings are bad.
07-13-2012
No should I do sea foam in oil? How do you do a cylinder leak test
07-14-2012
three causes of leakage are: head gasket, or either valves. head gasket is pretty easy to rule, out. in that case, you would be looking most likely at bad valve seals.
07-15-2012
No idea still... replaced the module and it drives better but still misses... i hear a pretty bad backfire in the cat...could it be clogged? would it make the car drive like this?
07-15-2012
A clogged cat would cause P0300 Random Misfire and it wouldn't have any power in the higher RPM range.
You've already established that there is bad compression in 4 and 6. You have to either do something to restore compression or remove the head on that side of the motor.
Another thing I would try is put 2 ounces of SeaFoam right in the combustion chambers (4 and 6). Remove those 2 spark plugs and insert a piece of 1/4 inch tubing and inject the SeaFoam. Let it set over night. This will wash the oil from the cylinder walls. Before startup, crank the engine without plugs in and ICM disconnected, then put some 30W oil in the cylinders 4/6 and repeat. Reinstall plugs and reconnect ICM - start the engine.
07-15-2012
Okay I can try that...what would this do? Also it sounds like i have a ticking lifter... heres the vid
07-15-2012
You may want to pull the valve covers off and check for a loose rocker.
Do the SeaFaom thing and see what happens.
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