To give some background I have a 94 yj with a 2.5l (yes I know). The motor and tranny only has about 15k
I'm having a issue where starting from a cold start I can give it some throttle and at about 3k rpm it acts like its bogging out, but right after that happens the rpms continue like nothing even happened. This also occurs when it's warmed up but not all the time. I started off with the basics (wires,plugs,cap,rotor,etc). I'm just at a loss and I'm just trying to see if I can bounce so ideas off you guys.
The most common thing people suspect with your problem description is the throttle position sensor (TPS). It attaches to the throttle body. You can do some trouble shooting with some manuals you can download from youtube thru the redneck garage, 1995 fsm (close enough to 1994) and 1993-1995 power train manual. You can also search youtube for video on how to trouble shoot the tps.
So funny thing about that when I was coming home from work the check engine light came on. Read the code and it said exactly the tps sensor. I tried to do the tps sensor with a new one and nothing happened. I think it made the response worse because it feels like it's holding back and then let's it rip. And on top of that it still backfires.
So I was just messing around and was looking at the O2 sensor and looked like it was burnt at the very end. I don't know if this could be the problem but I might try to replace anyways and see what happens
It is possible that it could be the O2 sensor. But I doubt that it will cause a miss at a certain RPM.
I would lean more toward the cam sensor or possibly the vacuum advance on the distributor. Those would cause a miss to happen at a certain RPM. Make sure your vacuum line going to the distributor has vacuum to it, then raise the throttle by hand and watch the back of the vacuum diaphragm on the distributor to see that it moves when the rpm changes. If it is moving, then its probably the cam sensor which is down inside the distributor housing, under the rotor.
It is possible that it could be the O2 sensor. But I doubt that it will cause a miss at a certain RPM. I would lean more toward the cam sensor or possibly the vacuum advance on the distributor. Those would cause a miss to happen at a certain RPM. Make sure your vacuum line going to the distributor has vacuum to it, then raise the throttle by hand and watch the back of the vacuum diaphragm on the distributor to see that it moves when the rpm changes. If it is moving, then its probably the cam sensor which is down inside the distributor housing, under the rotor.
So yesterday I went out and bought the O2 sensor and put it right in and drove from really light to really hard on the throttle either in hot or cold and still didn't do what it used to do before. I'm going to test it again today and see what happens. Thank you guys for the help. Hopefully everything will be alright
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