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Old 12-08-2008, 12:21   #1 (permalink)
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2 good cyl 2 bad... Lifters or timing?

ok so i have posted about my car in some other posts and was told to check the compression heres the result from front to back of engine

cyl 1 is at 120psi
cyl 2 is at 115psi
cyl 3 is at 0psi
cyl 4 is at 0psi

I even went back to cyl 1 and 2 to make sure the guage wasnt cloged i checked them all twice the key was turned over for 5-10 seconds.

Could this be bad timing issue causing the 3rd adn 4th cyl not to raise or could it just be bad lifters?
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Old 12-08-2008, 12:38   #2 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

You are probably going to have to pull the head see whats going on.

Broke valves or busted pistons maybe??
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Old 12-08-2008, 12:58   #3 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

Ok so some ppl are telling me that it may be a bad gasket between cyl 3 and 4 which makes sence to me same with broken pistons or lifters but could their be a chance the cam timing is off? I dont understand how it could be being the fire order is 1,3,4,2 and the first and last cyls are good but the middle are bad i figure if the timing is off they wouldnt even lift or sure enough if one doesnt lift in this case the other or next one wouldnt either right?
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Old 12-08-2008, 13:19   #4 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

It it were a bad head gasket you would at least have some compression in those cylinders.

It's not a cam timing issue. Look at it this way, if it were then cylinders 1 & 2 would be bad. It's a mechanical issue.
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Old 12-08-2008, 13:28   #5 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

Quote:
I dont understand how it could be being the fire order is 1,3,4,2 and the first and last cyls are good but the middle are bad i figure if the timing is off they wouldnt even lift or sure enough if one doesnt lift in this case the other or next one wouldnt either right?
Now hold on, cylinder 1 is at the front of the engine and 4 is at the rear. Its 1,2,3,4 from cylinders front to rear. It's 1,3,4,2 on the distributor.
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Old 12-08-2008, 13:42   #6 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

Take your firing order, 1-3-4-2 and break them in half.

like this
1-3
4-2

Cylinders 1 & 4 will rise at the same time then 3 & 2.

1 will be on compression stroke 4 will be on exhaust stroke. Then after 1/2 turn of the crankshaft 3 will be on compression & 2 on exhaust. another 1/2 turn 4 will be compression & 1 will be exhaust. another 1/2 turn 2 will be on compression and 3 exhaust. another 1/2 turn it starts all over again.

It take 2 revolutions of the crank to equal one revolution of the cam.
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Old 12-08-2008, 15:11   #7 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

Just read the other thread ... you are in for a rough rebuild.

If I were you, I'd pull the plugs and the valve cover and turn the engine over with a breaker bar on the drive shaft (don't use the starter - all kinds of bad things could happen if the camshaft broke). If there is action in the rocker arms for pistons 3 & 4, then you are lucky - it is probably just a valve stem that snapped and rebuilding the head will get you back on the road.

If you threw a rod, or if the rocker arms don't move, I'd call a salvage yard and cut your losses there. There is a good chance that the internal damage from throwing a rod or breaking the camshaft will make the engine unrepairable.
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Old 12-08-2008, 15:23   #8 (permalink)
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Re: 2 good cyl 2 bad... Lifters or timing?

Well im starting with tearing everything out huh. Im going to take a deeper look lol ive already got down to the fuel line tomorrow i work and im sure it will be dark by the time i get back but ill prob still try and attact the passenger side of the matter and get to the valve cover see what im dealing with wish me luck guys...

This is my christmas preasent lol how much its gonna cost isgoing to be my preasent from my rents and a little on my behalf this sucks!!!
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