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Old 08-21-2012, 09:07 PM   #1
flaurencelle
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SVT Compression Test Results : Blue Smoke at high RPM

Hello All!

I would need some of you experts here to give me your advice on this..

I bought a 2002 SVT with 122k Miles and I recently changed the oil and realised there was about 1 liter left!! My friends following me while I was accelerating noticed that there was indeed blue smoke and smell when I was accelerating.

Following this, I decided to do an engine compression test to see if I had a leak somewhere.

Starting with the dry test (No Oil in the chambers) i got these results (Starting from Timing belt)

1 : 125
2 : 120
3 : 120
4 : 130

Then when ahead with some oil in the chambers to see if there could be a leak through the pistons and got this

1 : 140
2 : 150
3 : 135
4 : 145

I really don't know how to interpret those results!! I heard the svt should be somewhere in the 80s because of the vct!
It also looks like every cylinder is leaking..weird..!

The spark plugs are very interesting...very white for 1 & 2 and going slowly back to normal towards 4..see below : 1 Left--->4 Right



Anybody ever came with similar results? I don't know where to start to figure out what the problem is!

Thank you for your help in advance!!


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Old 08-21-2012, 09:49 PM   #2
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1-2 are burning some oil , the dry compression is very good in my opinion

I would do some Motorcrafts sp463 plugs see whats happening with a datalog and go from there

Tom
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Old 08-21-2012, 10:15 PM   #3
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Thanks Tom! So glad to hear your feedback!

I will indeed change those plugs. As far as burning oil, I would believe that it's very likely the head gasket because i have 1 & 2 closeby, what do you think? However #2 difference between dry and wet is quite significant, which makes me think it could be a ring..but again..not sure. I wonder how long i could live with this leak..but i don't like it!
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Old 08-22-2012, 07:11 AM   #4
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Have to ask the obvious - could an oil leak also help explain where 3 liters went?
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Old 08-22-2012, 09:30 AM   #5
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Good point, sorry i forgot mentionning that there is no leak at all in my driveway...
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Old 08-22-2012, 01:38 PM   #6
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did the top of the head have oil in teh spark plug holes on 1 and 2? i'm just wondering if the vct is leaking.
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Old 08-22-2012, 02:55 PM   #7
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Couldn't see any traces of oil around the top of any sparkplugs and between the cover and the cast of the head! Im really puzzled! I would find it odd that 2 cylinder rings would be bad. When i bought the car, the owner told me (if it true i don't know) that the engine was rebuild 10k before..
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Old 08-23-2012, 06:35 PM   #8
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Sounds like something along the lines of valve stem seals. I'd remove the manifolds to see if the valves had residue on them. Thats just me.

The wet and dry comparison test can be inconclusive due to many factors. I would scrap the numbers and do one test on the engine at operating temperature, no more than 5 minutes after shutdown. By then the rings should be expanded and full of oil.

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Old 08-24-2012, 12:40 AM   #9
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I did the test about 5minutes after the engine as shutdown...very hot!

Good idea to check the valves...however due to the very little space available to see through the manifold s ports, i may end up removing the whole head! Wish there was a product to clean those...i did try seafoam...no success...
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Old 10-14-2012, 11:56 PM   #10
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Same Thing again... changed the plugs, went to do an oil change, only 1.5 Qt left!! Scary! I removed the plugs and observed that the plugs thread was oily on 1 & 2. I wonder where the leak can come from... thats a big amount of oil being burned in such a small amount of time!

No leak anywhere on the engine or underneath and I didn't find a big amount of oil coming in the pcv cables from the valve cover or the crankcase.
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