spark plugs dripping with oil on suzuki forenza

[Rob Miller]

86k miles

Started to hesitate real bad driving on hi way and threatening to stall at lights

Check fuel pressure and it is fine 60psi
Pulled plugs and the threaded parts are all dripping with oil with #1 being the worst
Cylinder pressure test shows 100-150 then leaking down slowly
Cylinder leak down test shows low leakage accord the board

So now I’m stuck….

Any advice will be appreciated.

Topic

[Bill]

If the spark plugs are at the bottom of a tube it’s likely the tubes are full of oil from the seals leaking at the top. Since I’m not real familiar with that engine I can’t be 100% sure but several other brands use the same setup and have oil leaking issues.

When you unscrew the plugs that oil in the tube runs down the spark plug thread. If there is enough in there it can cause a misfire.

[Its me]

[quote=”rmiller” post=70346]86k miles

Started to hesitate real bad driving on hi way and threatening to stall at lights

Check fuel pressure and it is fine 60psi
Pulled plugs and the threaded parts are all dripping with oil with #1 being the worst
Cylinder pressure test shows 100-150 then leaking down slowly
Cylinder leak down test shows low leakage accord the board

So now I’m stuck….

Any advice will be appreciated.[/quote]

+1 about what Wysetech said….

Not to insult your intelligence, but did you write down the psi for each cylinder when you did the compression test. You should capture the highest reading… All will leak down… A good compression gauge holds on the highest compression reading.

I.E. Cylinder 1 – 150 psi Cylinder 2 – 100 psi Cylinder 3 – 100 psi Cylinder 4 -150 psi…

The above numbers could show just a head gasket leak between cylinders…. The important thing on a compression test is that the cylinders are not different by more than 20-25% Also, this should be done when the engine is warm. Also a wet test (adding a few drops of oil) can help you determine if rings might be the issue.

When you say leak down test and had low leakage across the board, did you use an actual leak down tester, if so, what was your percentage of loss? Or did you just apply compressed air to the cylinder and try to listen for noises and check for bubbles… This should also be done with a warm engine and the tested cylinder at TDC….

The #1 cylinder having the most oil is interesting… Was this your lowest pressure cylinder? It is possible you have a ring issue but more detailed information/testing is required.

-Karl

[Author]

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