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Discussion Starter · #1 ·
Hello all, I was hoping you could help me figure this one out:

Two weeks I ran a compression test because my car was bogging and there was smoke coming from the exhaust during startup

Cylinder 1: 151
Cylinder 2: 60
Cylinder 3: 151
Cylinder 4: 151

I left the car alone until today, I ran seafoam spray engine cleaner and lube (through the throttle body) thinking I might have a stuck valve or something. Results:

Cylinder 1: 120
Cylinder 2: 151
Cylinder 3: 151
Cylinder 4: 151

WTF

So I dropped some oil into cylinder #1, along with some seafoam, started the engine and revved til the smoke stopped

Cylinder 1: 151
Cylinder 2: 151
Cylinder 3: 151
Cylinder 4: 151


So, is my engine ok?
Why would the low psi cylinder move from #2 to #1 in two weeks/after seafoam?
I had some white smoke coming from the behind the valve cover during startup that went away?

What is my next step? Valve clearances? More seafoam spray? Lol?

Thanks!
 

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Always on TDY...
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Compression looks good now... Drive for a couple days and see how it feels. No clue why the results were above, but maybe the seafoam just had to run through the system.

Probably worth doing a complete oil change to get the old stuff out and fresh oil in
 

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Discussion Starter · #4 ·
Compression looks good now... Drive for a couple days and see how it feels. No clue why the results were above, but maybe the seafoam just had to run through the system.

Probably worth doing a complete oil change to get the old stuff out and fresh oil in
Yeah, I'm going to daily the car next week and test throughout the week, maybe seafoam one more time, then if all is ok change the oil and spark plugs.

I would assume the low reading was a mistake. There was probly never anything wrong? Just my thought on it.

I've been messing with cars for a while and I have adopted the theory that if the problem only happens once, its not a problem.

Haha, I hope that is the case!
 

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So I dropped some oil into cylinder #1, along with some seafoam, started the engine and revved til the smoke stopped

Cylinder 1: 151
Cylinder 2: 151
Cylinder 3: 151
Cylinder 4: 151
Usually you would be putting the oil in to determine if the piston rings are bad. The oil fills the piston to wall gap and causes the compression to go up.

Your numbers seem a bit odd though, exactly 151 across the board is unheard of, but possible. Do another compression check after a few trips and see what you get. Make sure you are getting 4-5 full compression strokes, or that the gauge is not going up any further. You may only have gotten half a stroke on the first two readings.

It's possible you had something stuck and the seafoam magically did something, like loosen up a stuck ring. I'm not a big fan of randomly dumping "seafoam" into the engine. Some people swear by it, but I have seen some disasters as well.
 

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Past Driver’s Ed
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I agree with Thewral6th on your compression test procedure/results. Also, Seafoam makes a good product but it’s not a cure all for all your engine's ailments.
 
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