Delasangre4231 Posted June 29, 2009 Share Posted June 29, 2009 It sounds like its missing. I pulled the plugs and one has oil on it. Which is more likely, valve seal or piston rings? Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted June 30, 2009 Share Posted June 30, 2009 Oil or unburnt fuel from not firing? Does the car have a miss? Is the car smoking? What is the compression pressure in that cylinder. Answers to these should pinpoint the problem. Quote Link to comment Share on other sites More sharing options...
shika805 Posted June 30, 2009 Share Posted June 30, 2009 could be unburnt fuel, i had that issue with mine. go check your compression for that certain cylinder. Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted July 1, 2009 Share Posted July 1, 2009 I had oil on a spark plug from bad piston rings, the car smoked and the compression on that one was 110, compared to the 170 on my best one... maybe you will get similiar results... Quote Link to comment Share on other sites More sharing options...
Delasangre4231 Posted July 1, 2009 Author Share Posted July 1, 2009 I don't have a compression tester or them money to get one... It doesn't smoke. If you read my original post it says its missing. Quote Link to comment Share on other sites More sharing options...
thrustnut Posted July 1, 2009 Share Posted July 1, 2009 I'm pretty sure a valve seal won't make your car miss. Got spark? You can borrow a compression tester from most auto parts stores. You write a check and when you bring it back they give you the check back. If you want good help, we need more info. Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted July 2, 2009 Share Posted July 2, 2009 I don't have a compression tester or them money to get one... It doesn't smoke. If you read my original post it says its missing. I think a bad ring can, lower compression, could sound like a bad miss. Quote Link to comment Share on other sites More sharing options...
Delasangre4231 Posted July 2, 2009 Author Share Posted July 2, 2009 Well I am going to order a compression tester and check it... Quote Link to comment Share on other sites More sharing options...
thetremendoustim Posted July 2, 2009 Share Posted July 2, 2009 just go to kragen/shucks/autozone w/e and rent one!! i've done it three million times! you buy it and when youre done they buy it back! Quote Link to comment Share on other sites More sharing options...
chrismiller5157 Posted October 9, 2009 Share Posted October 9, 2009 Could be your valve stems....my 83 leakes oil out of 2 and 5. but the car has no miss, black smoke only at 5,500 to 6,000 RPM rang and all the power in the world to give me at all RPM's. Quote Link to comment Share on other sites More sharing options...
Delasangre4231 Posted October 9, 2009 Author Share Posted October 9, 2009 Thanks but the issue is solved, it was fuel not oil, due to a stuck injector. Quote Link to comment Share on other sites More sharing options...
PhilbertZ Posted October 9, 2009 Share Posted October 9, 2009 Thanks but the issue is solved, it was fuel not oil, due to a stuck injector. glad you solved it! how do you test for a stuck injector? Is it visible to the eye when you remove it? Do you need to do anything to test it when you remove it? Can you test an injector without removing it? Quote Link to comment Share on other sites More sharing options...
Delasangre4231 Posted October 10, 2009 Author Share Posted October 10, 2009 Yes I left the injector in. I pulled the spark plug and cleaned it then put it back in and unplugged the electrical connector from the injector. (if injector is working properly then it shouldn't open or operate). Then disconnect the coil so the car wont start and turn it over a few times. Pull the plug again, if there is gas on the plug with the injector unplugged then its stuck. My next step was to replace the injector... Quote Link to comment Share on other sites More sharing options...
PhilbertZ Posted October 12, 2009 Share Posted October 12, 2009 Yes I left the injector in. I pulled the spark plug and cleaned it then put it back in and unplugged the electrical connector from the injector. (if injector is working properly then it shouldn't open or operate). Then disconnect the coil so the car wont start and turn it over a few times. Pull the plug again, if there is gas on the plug with the injector unplugged then its stuck. My next step was to replace the injector... Thanks - I tried this yesterday with my final barrage of tests before taking to smog (third time this past few months) and FINALLY passed - with flying colors this time. This site's been a wealth of knowledge for me in terms of learning about EFI - thanks everyone! Quote Link to comment Share on other sites More sharing options...
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