I just purchased a 2001 Jeep Wrangler. It only has 70K miles. I drove it 2,000 miles back home. No problem on the drive home. When I arrived home I checked the radiator coolant and noticed it was low and added about a quart of antifreeze. Looked fine when I took off. I also noticed some water/condensation coming out the exhaust afterwards. I completed a compression test (all plugs out/throttle wide open/4-5 cranks) #1-130lbs #2-140 #3-120 #4-125 #5-140 and #6-70 lbs. I squarted a little oil in #6 and retested and went up to 80lbs. I believe this is normally pointing to bad rings but keep in mind the vehicle set for about a year before I purchased it. I've squarted some PB blaster in the plug hole and I'm going to retest tomorrow the compression. It appeared to have been running fine, good power, no smoking, all the plugs good good (grayish color).
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Hello,
Sorry to say, that is a dead cylinder.
Test the coolant with a combustion gas test kit (auto parts stores have them). If you find combustion gas in the engine coolant. Get ready to tear off the heaviest cylinder head you can find on a gasoline engine.
If there is no combustion gas in the coolant, put a little automatic transmission fluid in #6, crank without ignition, and let it sit overnight. In the morning, crank again, then fire it up.
After it runs for a moment, shut it down and recheck compression. The detergent in the ATF will likley clear carbon out if it is built up, and allow the rings to sit properly in the piston.
If this does correct compression issues, then !change the oil/filter!, and enjoy.
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Sorry you have a problem with a vehicle you just bought. Low on coolant and the symptoms you are describing can lead to a couple of different causes. It can be a head gasket or cylinder head. If the cylinders are washed down it can cause the readings you are getting. I would recommend having it tested by a professional shop even if you thinking of doing the repair yourself. It may not be as bad as you might think. if you have any questions or if we can be of assistance just give Prairie Road Automotive a call at 541-688-3346.
Thank you - Bill Filley Owner of Prairie Road Automotive
Complete Bulletproof test of combustion chamber > Remove radiator cap > Remove valve cover > Remove cylinder # 6 rocker arms > Air test cylinder # 6 using correct test adapter >>> Where is air coming out at? .. IF not equipped, tools available @ parts store .. IF not familiar with proceedure .. Seek qualified hands-on help!
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