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Old 11-05-2013, 01:05 PM   #1
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Shifting/Throttle Frustration

I've done some searching and can't find a good explanation or much experience with this exactly. I have a 04 TJ, 6-cyl 5-spd, 60k miles. I'm having issues, especially while shifting. I'm getting some throttle revving sometimes, and sometimes a sharp drop in RPM between gears, causing some real inconsistency with shifting. Never had issues like this with another vehicle and it didn't used to do this that I remember. Only occasionally do I get a smooth shifting experience... I've looked at air filter, replaced throttle position sensor.

One issue I can think of, and I haven't gotten a clear response from others who have had this happen, is I had to have the clutch replaced about 10k miles ago. Maybe it was just me paying special attention to this new repair, or this is what is causing my issues. I was not aware of the bell-shaped convex flywheel that our Jeeps have, and I don't think the mechanic was either, as he resurfaced the flywheel. Not sure how much was taken off, but if this could cause my issues, but it seems the transmission and clutch is louder (pronounced "rattle" when in neutral with clutch disengaged, and some squeaking and shaking of clutch/pedal when lightly pressed), and this issue of inconsistent shifting started shortly after the "repair". I talked with a lawyer who said I might have a case for negligence on the repair shop, as they did work against the recommendations of the factory manual without properly informing me. I would hate to take it that far if it's not the issue...

Another thing I've noticed, which doesn't seem typical, while the car is NOT on, when I push the throttle body lever back, and release it, there's a "bounce". Best explanation I have for it. I'm not sure if the butterfly itself is bouncing, or the pedal is? Wondering maybe it would be a throttle return spring that's bad?

Does anyone have any suggestions or advice of what else to look for or try to troubleshoot these symptoms? Maybe they are connected or unrelated? Would appreciate any input! I haven't had the time to really dig into this, especially with it being my daily driver...

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Old 11-05-2013, 02:08 PM   #2
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A vacuum leak can cause the engine to rev higher than it should. I'd suspect that before a clutch issue. That can sometimes be caused by a sticky/dirty IAC (idle air controller) which is the device that provides all of the engine's air at idle RPM's. If dirty, it could stick and give the engine unwanted air which would raise the RPM's at the wrong time. Using an aerosol throttle body cleaner to clean the throttle body while the engine is running as close as possible to idle RPM's may do the trick. The IAC will tend to suck in the throttle body cleaner and clean itself if the RPM's can be held at or as close to idle as possible. Restart the engine as needed during the cleaning process.
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clutch , rev , throttle , transmission

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