Hello, all!
I have a random misfire with no codes, 1999 TJ 4.0 manual. You can hear it, the vehicle shakes a little when it happens, but I don't have, and have never had, a misfire code.
I've changed the crank sensor, TPS, chased down a vacuum leak and repaired it. Throttle body gasket changed. We tried pulling each injector harness with the engine running but there was no difference in performance degradation and the misfire continued. I tested fuel pressure a few weeks ago, and while I can't remember the values off the top of my head I had looked up what it was supposed to be and it was dead-on. Plugs are iridiums, installed about two years ago. Cap and wires as well.
I was driving back from out of town a week ago, it was bucking at high speeds, running a high idle (1200 RPM), though at idle it would sometimes try to stall. I was stuck on a long road trip and had to drive it about three hours that way. Replacing the CPS seems to have fixed the bucking issues, the TPS fixed the high idle.
I've searched a bunch of threads, but most involve a code, or have worse symptoms than mine. You can hear/feel it, but the engine runs and gets me where I'm going.
I'm at a bit of a loss here. Would anyone recommendation a next step? Is it safe at all to drive it like this?
I have a random misfire with no codes, 1999 TJ 4.0 manual. You can hear it, the vehicle shakes a little when it happens, but I don't have, and have never had, a misfire code.
I've changed the crank sensor, TPS, chased down a vacuum leak and repaired it. Throttle body gasket changed. We tried pulling each injector harness with the engine running but there was no difference in performance degradation and the misfire continued. I tested fuel pressure a few weeks ago, and while I can't remember the values off the top of my head I had looked up what it was supposed to be and it was dead-on. Plugs are iridiums, installed about two years ago. Cap and wires as well.
I was driving back from out of town a week ago, it was bucking at high speeds, running a high idle (1200 RPM), though at idle it would sometimes try to stall. I was stuck on a long road trip and had to drive it about three hours that way. Replacing the CPS seems to have fixed the bucking issues, the TPS fixed the high idle.
I've searched a bunch of threads, but most involve a code, or have worse symptoms than mine. You can hear/feel it, but the engine runs and gets me where I'm going.
I'm at a bit of a loss here. Would anyone recommendation a next step? Is it safe at all to drive it like this?