Question about 1998 Jeep Wrangler

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I have a 98 wrangler 6 cyl. automatic. When I start it, it revs high, hot or cold, and if I give it gas it pops through the exhaust. I just installed a new engine, cap rotor, plugs, wires, crank sensor, cam sensor, fuel pump. ahd this problem prior to engine replacement. could the IAC cause the mis fire? i am getting a p1390 and p0320 code. could it be a intake leak? not usre what is causing the popping...

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P1390 Timing Belt Skipped One Tooth or More (Chrysler, Jeep, Mitsubishi)

Easy way to clear codes is to just disconnect the battery for about half an hour. Chances are though for that code to show up it actually is out of sync. Clear the code, if it comes back it's not correctly timed.

P0320 code is crank position sensors

The crank position sensors are a relatively common failing item, along with the occasional installed height issues. The wiring could also be problematic as I've seen a couple harnesses pulled tight and rub on the bellhousing and cylinder head. To properly diagnose, you should have someone scope out the Crank and cam sensors. If the Crank sensor drops out check for good power and ground on that circuit and you know your problem. If you have a scan tool, when the vehicle dies, you can read rpm information, if there is no rpm shown while cranking (best done with only the rpm and crank synch pids showing to speed updates) then crank sensor is also suspect. Some scan tools show Crank counts. This information also helps identify the Crank Sensor condition. You could also do an ohms test if the vehicle stalls and doesn't start for a period of time. If you read an open circuit until it cools off, it's time for a new crank sensor. You could also have a wiring issue to the Crank position sensor, a bad pcm or other less likely issues, such as a bad cam position sensor giving unreliable information (position) and thus triggering a Crank code. If you have the sensor, and aren't going to return it, you could always install the new part and see if your symptoms disappear...

Also the p1390 can cause the pop through the tail pipe.

Good luck

Posted on Oct 04, 2009

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