Do you have ev1 or ev6 connectors for your fuel injectors? I had the ev1 for my xj and after building the stroker I had a misfire on 2 cylinders. Turns out the injector wasn't getting the signal on the offending cylinders. So I bought ev6 connectors since thats the style injector I had (they included and adapter) and I dont have misfires anymore.Yup, I'm resurrecting this one.
I'm looking for opinions on where to look next to fix a (now only) a sputter at low idle. If I apply the skinny pedal while in gear it will non-violently chug until I get to ~1500rpm, and then whatever is off is not anymore and she drives like it did off of the dealership lot. I can drive all day if I want. I'm getting good mpgs (thanks regear!), and she has power to do whatever needs to be done. After driving for a bit, she idles just fine. It has proper throttle response, and purrs like a kitten. If I stop the engine for a little bit, it'll start right up but slowly make it's way back to the sputter. There are no CEL's being presented.
I had been thinking a Cam Position Sensor was the issue after replacing the a CKPS with a mopar CKPS. That made a world of difference in the symptoms I had been having and has me on the right track. When it sputters, she smells rich in the exhaust. No sulphur/bad eggs smell, just fuel. So I think the Catilytic Converter is okay. This symptom has me thinking it's a fuel delivery or spark issue. My ZJ does not have an EGR, and when my backup PCM is installed it has the same symptoms.
Today while troubleshooting the issue, I had replaced the cam position sensor, and the car will purr intitally but the PCM will adjust for the new part, and viola! the sputter is back.
I've replaced just about every sensor except the temp sender at the thermostat and the IAT(code scanner shows them working properly). New: IAC, TPS, MAP, CKPS, timing chain/gear set, wires, coil, distributor, cap, rotor, and they're about 3 months on new champions in the plug holes. The fuel pump, and filter/regulator is less than 1 yr old. I just put some fuel system cleaner in a 1/2 tank of gas today: we shall see what happens there.
So, I've been searching this forum and others, and have not found anything I have yet to think of.
After everything replaced thus far, I am gonna order a Mopar CPS, re-gap the plugs, and recheck for vacuum leaks.
I think that I have covered just about everything else. It seems as if the issue is fuel delivery or spark. The mechanical timing is spot on, and I am leaning towards a not up to spec CPS. Although I am less than 50/50 on that being the issue. I tried swapping out CPS' today while changing the plug wires. And though the idle was fine for the first couple of mins or so, the idle returned to the sputter.
Could this be a physical/mechanical issue? The sputter is intermittent, and then goes constant. It goes away after driving above 1500 rpms and the jeep runs pristine. The sputter will usually return on the next start.
Any ideas or suggestions?
If the next round of adjustments don't fix it, I will be at a loss for easy answers.
I am not getting any misfire codes, nor any injector codes. I am starting to suspect the injectors though.Do you have ev1 or ev6 connectors for your fuel injectors? I had the ev1 for my xj and after building the stroker I had a misfire on 2 cylinders. Turns out the injector wasn't getting the signal on the offending cylinders. So I bought ev6 connectors since thats the style injector I had (they included and adapter) and I dont have misfires anymore.
It could be a bad/corroded contact causing the issue and perhaps it is finally able to make a stable connection. Maybe there's a corroded wire somewhere. I'd get some noid lights to check your injectors on a cold start.