waynehartwig
www.jeeperman.com
- Location
- Mead, WA
I've been digging into my motor over the past couple of months trying to figure out why it runs hot... I haven't done much as I haven't had the time to divulge.
I pulled the plugs and 1-3 had a nice brown core with a bit of black soot on the threads. 4 was white porcelain. 5 was fouled with a brown build up - carbon? It wasn't oil, it was brown and porus. 6 looked like 1-3 but without the black soot.
Ok, so #4 is lean. #5 could possibly be rings, valve stem seals or? Maybe the coil isn't firing there?
So then I did a leak down test. #1 was 20%. #2 was 10%. #3-6 I couldn't get much of a reading at all. Confused, I went back to #1 and nothing again. By nothing, I mean no pressure could build up - and yes, the valves were closed. #4 I couldn't tell where the air was going, but the others it was obvious it was leaking past the rings.
So today I pulled the injectors, because I am going to swap #4 and #1 to see if the lean condition follows or? I'm also going to swap 5 and 6 with 2 and 3. To see if those conditions change as well. While doing this, I did a compression test. #1 150, #2 130, #3, 210, #4 60, #5 80, #6 95. Then I went back to #1 and checked it again for 65.
So what I'm finding is sometimes I have good compression with no leakdown, and other times it's very low with lots of leaking. Tomorrow? I'll squirt some oil in the cylinders and see if that makes a difference. If not, I'll be pulling the valve cover and looking there before pulling the head.
So now question....
If I find I need engine work, I was thinking about scrapping it and swapping in a SBC. For those that have done the swap, would it be the cheaper way to go? or should I spend the $'s and fix my 4.0l for now. Money is tight with xmas coming up....
Also, I got to thinking today, the dang thing might still be under the extended warranty that I bought. So Monday I'll call the dealership and see if they can tell me if it is. $100 deductable is nothing for a new motor
I pulled the plugs and 1-3 had a nice brown core with a bit of black soot on the threads. 4 was white porcelain. 5 was fouled with a brown build up - carbon? It wasn't oil, it was brown and porus. 6 looked like 1-3 but without the black soot.
Ok, so #4 is lean. #5 could possibly be rings, valve stem seals or? Maybe the coil isn't firing there?
So then I did a leak down test. #1 was 20%. #2 was 10%. #3-6 I couldn't get much of a reading at all. Confused, I went back to #1 and nothing again. By nothing, I mean no pressure could build up - and yes, the valves were closed. #4 I couldn't tell where the air was going, but the others it was obvious it was leaking past the rings.
So today I pulled the injectors, because I am going to swap #4 and #1 to see if the lean condition follows or? I'm also going to swap 5 and 6 with 2 and 3. To see if those conditions change as well. While doing this, I did a compression test. #1 150, #2 130, #3, 210, #4 60, #5 80, #6 95. Then I went back to #1 and checked it again for 65.
So what I'm finding is sometimes I have good compression with no leakdown, and other times it's very low with lots of leaking. Tomorrow? I'll squirt some oil in the cylinders and see if that makes a difference. If not, I'll be pulling the valve cover and looking there before pulling the head.
So now question....
If I find I need engine work, I was thinking about scrapping it and swapping in a SBC. For those that have done the swap, would it be the cheaper way to go? or should I spend the $'s and fix my 4.0l for now. Money is tight with xmas coming up....
Also, I got to thinking today, the dang thing might still be under the extended warranty that I bought. So Monday I'll call the dealership and see if they can tell me if it is. $100 deductable is nothing for a new motor