Nashmanche Posted June 18, 2019 Share Posted June 18, 2019 I am looking for some guidance, opinions and recommendations, not necessarily in that order, from the wealth of knowledge that exists on this site. So my 86 2.5 has been developing a knock (no, not just a ticking) in the last couple of months, along with smoke exiting the tailpipes. I also noticed that the last time I changed the oil a few months ago, which was very black, the new oil became very dark within a few days afterwards with very little driving. This is not a DD and it currently sits more than it is driven. I have also noticed that it seems to have a lack of power from just a few months ago. I have not done all of the tests that everyone is probably thinking to themselves right now, compression test, leak down test, etc., because I haven't the tools and have not had the chance to get to it. My question is, do you think with what I have told you that this 2.5 may be worn out? The odometer reads around 168K, but I am not sure it is even the original engine. You can also see from the attached picture that these two dark circles on this piece of OSB were created when I fired it up. It was placed about 18 inches behind the tail pipes and appears to be oil spots. I will try to get a video of it running and post it if anyone thinks that will help. Do you think I need to start looking for another 2.5, or could I be missing something else other than what I already fear is the obvious? Thanks. Link to comment Share on other sites More sharing options...
Jeep Driver Posted June 19, 2019 Share Posted June 19, 2019 You're a smart guy........you already know what to expect. Yes, you'll get opinions based on two trains of thought here. One will say- Do a compression test, replace your PCV valve and change your oil.....Jeeps go for 500,000 miles. And then...........there is me. Based on your own assessment you've answered your own question. It's my assertion that you got exactly what a 2.5 was built to deliver.......good for 150K, if you took real good care of it- maybe 200K. There are no magic tricks, it's time for a rebuild. Also, when it's old and tired and it talks to you and tells you it's old and tired.........well, it's old and tired. Link to comment Share on other sites More sharing options...
omega_rugal Posted June 19, 2019 Share Posted June 19, 2019 looks like it´s getting too much fuel... Link to comment Share on other sites More sharing options...
Jeep Driver Posted June 19, 2019 Share Posted June 19, 2019 3 minutes ago, omega_rugal said: looks like it´s getting too much fuel... Tons of blow-by. He does need to pull his plugs and read them..........bet they are saturated with oil. Valve seals are leaking for sure. Link to comment Share on other sites More sharing options...
Ωhm Posted June 19, 2019 Share Posted June 19, 2019 3 hours ago, Nashmanche said: along with smoke exiting the tailpipes. white?? blue?? black?? 3 hours ago, Nashmanche said: two dark circles on this piece of OSB Looks like soot. Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 49 minutes ago, Jeep Driver said: There are no magic tricks, it's time for a rebuild. Also, when it's old and tired and it talks to you and tells you it's old and tired.........well, it's old and tired. Yeah, your right. I pretty much know where this is heading. Guess I was just having a fleeting moment of denial. But to reference what you said in you last line... Its Like starring in a mirror some days. Lol 86_2.5_Knocking.html Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 21 minutes ago, Ωhm said: white?? blue?? black?? Looks like soot. Looks kind of white to me, but could be bluish. I can't trust these eyes no more. But, it's not as heavy or thick as I expected. I will try to post the videos I have of the engine running and tail pipe smoke tomorrow. I seem to be having a computer issue right now. Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 And I will pull the plugs and also do a compression test to get some numbers and confirm things. If for no other reason, maybe someone else will get something out of this too. I recently removed the throttle bore and cleaned it, replaced a bunch of questionable vacuum hoses, cleaned up and replaced the air box and all its connections, all electrical connections pertaining to the TBI and sensors, and started on a couple of Cruisers tips. I was having stalling issues when pushing the clutch in while down shifting to slow down. Doing all that cleared up about 98% of the stalling. 100% would have been better though. Link to comment Share on other sites More sharing options...
Ωhm Posted June 19, 2019 Share Posted June 19, 2019 Double check the vacuum hose to the MAP sensor. Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 Will do. Thank you. Link to comment Share on other sites More sharing options...
Jeep Driver Posted June 19, 2019 Share Posted June 19, 2019 5 hours ago, Nashmanche said: So my 86 2.5 has been developing a knock (no, not just a ticking) in the last couple of months 5 hours ago, Nashmanche said: the new oil became very dark within a few days afterwards with very little driving 5 hours ago, Nashmanche said: have a lack of power from just a few months ago I read what people write and answer accordingly. FWIW, I discounted the pic of soot marks.......meaningless to me. Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 Hopefully this video will work. IMG_0405.MOV Link to comment Share on other sites More sharing options...
Pete M Posted June 19, 2019 Share Posted June 19, 2019 autozone should have all the tools you need and rents them for free. Link to comment Share on other sites More sharing options...
Nashmanche Posted June 19, 2019 Author Share Posted June 19, 2019 Yes, they will be getting a visit from me soon. Thanks. Link to comment Share on other sites More sharing options...
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