Engine shuts off
Hi to all and thanks in advance for any possible help.
1985 Jeep CJ7 4.2L 6
My problem originally was the exhaust manifold was glowing and the idling seemed high, but engine would stall if idle was lowered. I was able to find some insight by finding Off-Road.com, but since I am a newbie dont really get all of it.
Reason being due to no understanding some of the verbage. Does ECM stands for the computer or ECU, what do the abreviations stand for I have ideas but they dont seem to match. Here is the original help tread that suggest what I am going through.
1989 YJ 4 cylinder 192K miles, 30K on ‘rebuild’ I added: 2” body lift 32x11.5 tires (good-by 5th gear!) When I recently purchased the vehicle it would not pass our state’s emission test. After replacing the EGR (physically damaged) and having an exhaust shop install a new catalytic converter, muffler, and pipe from the header pipe back, it passed the test. I thought things were going pretty well at this point. After about 2000 miles of mostly highway driving, I noticed some new exhaust noise and discovered that the muffler was cracked and discolored. The grease was also being slung from the adjacent u-joint. Things appeared to be heating up. The muffler shop warranty’d the muffler and I was back on the road. After another 1500 miles the same thing happened. Now the shop is claiming that my engine is running too rich, and that un-burned fuel is reaching the cat where it is igniting, and will have to be repaired prior to their next attempt (of which I will have to pay half of). They recommended a new O2 sensor, which I promptly installed. I failed to measure cat temperature prior to this replacement, but it now hits the mid to high 700 F (just behind the cat) when subjected to 15 miles of up hill highway driving. The muffler shop claims that this is excessive, and they don’t want to replace until I can ‘prove’ that the car is not coding, and is running cooler at the cat. The local Chrysler Dealer service rep said this older model does not store codes for retrieval, and that cat temperatures could run as high as 800F normally. The muffler shop disagrees; they feel that temps should not exceed 600 F. After purchasing a (Chrysler) manual, I’ve begun the testing procedures for the emission sensors (MAP, MAT, EGR/evap canister purge solenoid, TPS, WOT, etc.). So far I’ve only found one fault in the ECU from MAP sensor diagnostics: open circuit between terminals 2 & 17. The manual recommends replacing the ECU if the ground connection is solid. I’m trying to pry the $100 out of my wallet, but would like to be more assured that this is the problem. Is this a common failure? Is it true that I should not need to flash the memory for this older model? I also made a slight adjustment in the TPS to bring the voltage ratio up to the recommended range 0.925-0.935 from its pre-adjustment state of 0.89. I believe that the temp is still upwards of 600 F (my borrowed infrared thermometer maxes out in the high 500’s). Do you know of a document that states normal catalytic converter temps for this vehicle? Any thoughts, advice appreciated,
Hi Lowell, Before you go any further, refurbish the grounds: · Battery to engine · Engine to frame · Frame to tub Also at night look at the Converter/downpipe and exhaust manifold after the Jeep's been run a while. Are they glowing a dull red? LEVE
The reply giving to this post at the end asking if the manifold is glowing and I do have that problem. But now as of a week now the engine will not stay running. I have change the fuel filter it was a little clogged but the problem still the same.
I have no idea if I post correctly here and hope didnt put to much. I have never had a Jeep got it and love em. Just would like to have it back to the norm