- Location
- Everett, WA
I have a '95 XJ that has been giving me some issues. I doubt all are related but going to list them all here in case I am wrong and I can tie some of them together. I recently put in a rebuilt motor because the old one was burning 4 quarts between changes and started losing lifters...it was time. When I did that, I also did all tune-up parts, all new sensors, new exhaust, new cowl intake, and new injectors. These are some of the issues I've been having:
1. Pretty soon after I put in the new engine, I developed a backfiring issue. If I step on the gas too hard, too quickly, it will backfire through the exhaust repeatedly.
2. Even before the rebuild, I would have a slight misfire at idle. Injector changes, tune-ups, etc. made no difference but it was so minimal that I never really thought much of it and had just been living with it. The rebuilt engine does the same exact thing (leads me to think potential ECM issue?)
3. Recently I have been getting an intermittent CEL. Codes are
a. 12 (Battery disconnected in last 50 cycles): Not worried about that one.
b. 17 (Engine too cold too long): I have a 180 tstat in it right now because I had trouble getting a 195 to open when I did the rebuild and it kept wanting to overheat my new engine. I could swap in a 195 but it already sits at 210 (on the gauge) at lights which makes me nervous enough.
c. 23 (IAT issue): Sensor is basically new but considering swapping a new one in for S&G.
d. 27 (Injector control circuit issue): Injectors are new and I didn't see any obvious wiring issues when I had the motor out.
4. When I get above ~40 mph, I can hear and feel (through the body, not really through the steering) a vibration that seems to be in the front end. If I put a little right rudder in, the vibration goes away completely. All my ball joints, tie rod ends, u-joints, etc. look and feel tight and right. Took it into a shop and they couldn't find anything either.
When it comes to EFI, I am well out of my element for diagnosis other than the basic fuel, air, and spark. Any help is appreciated!
1. Pretty soon after I put in the new engine, I developed a backfiring issue. If I step on the gas too hard, too quickly, it will backfire through the exhaust repeatedly.
2. Even before the rebuild, I would have a slight misfire at idle. Injector changes, tune-ups, etc. made no difference but it was so minimal that I never really thought much of it and had just been living with it. The rebuilt engine does the same exact thing (leads me to think potential ECM issue?)
3. Recently I have been getting an intermittent CEL. Codes are
a. 12 (Battery disconnected in last 50 cycles): Not worried about that one.
b. 17 (Engine too cold too long): I have a 180 tstat in it right now because I had trouble getting a 195 to open when I did the rebuild and it kept wanting to overheat my new engine. I could swap in a 195 but it already sits at 210 (on the gauge) at lights which makes me nervous enough.
c. 23 (IAT issue): Sensor is basically new but considering swapping a new one in for S&G.
d. 27 (Injector control circuit issue): Injectors are new and I didn't see any obvious wiring issues when I had the motor out.
4. When I get above ~40 mph, I can hear and feel (through the body, not really through the steering) a vibration that seems to be in the front end. If I put a little right rudder in, the vibration goes away completely. All my ball joints, tie rod ends, u-joints, etc. look and feel tight and right. Took it into a shop and they couldn't find anything either.
When it comes to EFI, I am well out of my element for diagnosis other than the basic fuel, air, and spark. Any help is appreciated!