hey all so i could not figure out my miss ... so i took it to a shop and they said i needed to get a valve grind ! but they could not tell me my compression, so i was just wondering if there is a way to check myself befor i spend all the money on getting my heads done , the compresion is 150 in all the cyl. any other way to check ? thanks for your time
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- Thread starter knotty
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3-lot
Full Access Member
the compression is at 150 on all 8 cylinders? if so, thats all good.
next check, if thats what there leaning towards, is do a leak down test.
test all 8 cylinders, make sure the cylinder your testing is at top dead center on compression stroke (both valves closed), make an adapter much like a compression tester (that threads into the spark plug hole) but on the other end you need a airline fitting to hook up to a air tank or compressor.
plug the air line into the compressor and into the adapter thats threaded into the spark plug hole and listen for an air leak.
if you can hear it out the intake, you have a bad intake valve, out the tail pipe, its a bad exhaust valve. if no leak, no valve problem.
repeat in all 8 till you find the problem, if there is a problem, then yes, you need head work.
the compression test is stating your rings are all good so rule that out.
My thought is, if they wont give you the compression results, it might be bogus, check your fuel and ignition first.
a leaking injector or regulator will give you a miss.
check closely on your cap and rotor as well for any small cracks and carbon tracking.
are any of your spark plugs fouled worse then the others? if so, start test on that cylinder first.
3-lot
next check, if thats what there leaning towards, is do a leak down test.
test all 8 cylinders, make sure the cylinder your testing is at top dead center on compression stroke (both valves closed), make an adapter much like a compression tester (that threads into the spark plug hole) but on the other end you need a airline fitting to hook up to a air tank or compressor.
plug the air line into the compressor and into the adapter thats threaded into the spark plug hole and listen for an air leak.
if you can hear it out the intake, you have a bad intake valve, out the tail pipe, its a bad exhaust valve. if no leak, no valve problem.
repeat in all 8 till you find the problem, if there is a problem, then yes, you need head work.
the compression test is stating your rings are all good so rule that out.
My thought is, if they wont give you the compression results, it might be bogus, check your fuel and ignition first.
a leaking injector or regulator will give you a miss.
check closely on your cap and rotor as well for any small cracks and carbon tracking.
are any of your spark plugs fouled worse then the others? if so, start test on that cylinder first.
3-lot
foreverfalcon40
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Valve grind? never heard of that. Get them rebuilt. Labor is what is going to kill the deal. On a diff forum. Someone is elling rebuilt heads if I recall for 250 shipped. He has no bites...you can get them cheaper. LMK what you wanna do.
yeah i changed the plugs wires, cap , rotor , coil , egr valve , so i am stumped ! thanks for the help ! i will try and do my leak down test this week !
---------- Post added at 11:07 PM ---------- Previous post was at 11:05 PM ----------
i will let you know what i find out and hit you up if i need heads !
---------- Post added at 11:07 PM ---------- Previous post was at 11:05 PM ----------
i will let you know what i find out and hit you up if i need heads !
here is a new update ! i replaced 5 out of my 8 injuctors and still ran like crap so i took it back to the shop and found out it was a faulty cap , it has never ran this good since i have owned it !!!! its crazy i just pelaced the cap 1 month prior but i guess now i know that you can buy new parts that are bad only cost me 200 to figure it out but im back on the road ! YAY ME
