Recent content by JoPeter

Originally Posted By: crazyoildude joseph Did you do a compression test you could have a piston problem or maybe you broke a rocker arm/stud or a valve spring that could cause a bad missfire also. Take the valve cover off and look to see if they are all intact then start it and watch them and...

Originally Posted By: Dyusik Mo the bad head was early 2k 4.0, and most jeeps I see run sale oil to 300k+. Here is food for thought,10w30 is thicker only at colder temps, and is usually 1cst thinner than 5w30 @ 100celsius. If you want add pack delo is the way to go with boron out the ahem. I...

Originally Posted By: artificialist The other problem is that 1980s carburetors and smog devices failed regularly. Having a maze of vacuum hoses makes diagnosis even more challenging to diagnose. How does the choke work? If the choke will not open at the proper temperature, it will cause an...

Originally Posted By: artificialist An engine could run excessively rich if the oxygen sensor has failed. Back in 1987, most electronic controls could only give you an error code if the O2S had a short circuit, open circuit, or a voltage that is completely out of range. A failing O2 sensor might...

Synthetics are generally superior(but the gap has closed dramatically in the last few years), .....older vehicles you may see some seepage or leakage around seals. This is what majority of folks advised me. In that engine I would use a solid 10w40 if you can find it. Rotella synthetic 5w40...

Originally Posted By: crazyoildude joseph Did you do a compression test you could have a piston problem or maybe you broke a rocker arm/stud or a valve spring that could cause a bad missfire also. Take the valve cover off and look to see if they are all intact then start it and watch them and...

@Miller88: How you edit ? How to get this forum on iphone . i am on laptop & iphone will come handy Thanks

Originally Posted By: Dyusik Oil pressure sending unit comes out, and on you neighbors grass revv the engine. Use a bottle brush if you like. Those passeges are known to clog, and give false low readings. Mine runs just shy if 60, hot at 2k rpm, and 18-19 hot idle running a 5w40. Thanks! This...

@Miller88: Cool. I have to go down and look at it in evening. I am new and learning.. I think yes, but will confirm if there is a Cat right before muffler. Even if to replace myself is not that is expensive compared to a engine probs Thanks Rotella I am going to get today

Originally Posted By: Dyusik I had a mechanic tell me that vvte will never work unless I use 5w30. This in mind manufacturer recommends 5w20. I run 5w40, and would not hesitate to run 60wt oil if I had to, in the winter. Like always, it's not oil. Carb, bad fuel, loose anything. Oil can mess...

Originally Posted By: rjundi Use a heavier oil and make sure OCI is 3000 miles max. The carbs were terrible on these engines and the emmissions system a nightmare. The oil is likely getting diluted by all sorts of junk, unburned fuel. I owned a 1986 CJ-7 and it was primitive at best and...

@Miller88: Thanks and convincing answer for Rotella which I am leaning to. Good objective reason which I was looking for diesel vs conventional at same rating. If you heard anywhere or have any experience with Rotella causing cat damage because of ZDDP and other additives ? Many have vouched no...

@ kschachn: Thanks for bringing this up. I did not want to type and guide anyone to wrong conclusions. At same viscosity, I am advised synthetic do not have "shear" capabilities like conventional ones or diesel oils. Please correct if I am wrong? If iam wrong, then I dont need to worry about...

@RJUNDI: Thanks for taking time to help me out. I am hearing from many use thick oil: which one : conventional 15 w 40 (no synthetic, too thin for this old) or diesel oil Rotella 15 w 40 U probably gave me a great advice.. old mechanic who also know a bit about carbureator too. The one or 2 i...

@Miller88: Thanks for bringing up the typo, typing half asleep @ midnight: originally posted 5w 10 synthetic Mobil. I am wrong. It is 5w 30 for sure. Lessons learning..old 258s tend to not like synthetic oil, may be too less viscous compared to conventional. 1) I am sure u heard lot of folks...