I got a 1994 jeep cherokee that is idling really rough, sounds like its mis firing, and back firing.

i change the
distributor
distrubutor cap
spark plugs
spark plug wires
camshaft sensor
crankshaft sensor
fuel presure regulator
theromstat

do you guys have any idea?????

 

Is/was the check engine light on?

Have you checked for any engine fault codes?
http://jeep-xj.info/HowtoECUcodes.htm

 

no its not on.

 

Mine idles funky, but not ROUGH ROUGH. Like the tach jumps a bit above and below the line.. Maybe its normal? It has 211,000 on it. lolwut.

 

no you can tell something is wrong. it sounds like there not firing right or something along those lines.

 

check for codes any way soft code may be present

 

Backfiring generally indicates a fuel/air imbalance. Backfiring in the intake is usually a "lean" condition. Backfiring out of the exhaust is usually a "rich" condition.

Job #1 is to check comprehensively for a vacuum leak. Can be under the hood or in your exhaust system.

If no vacuum leaks found, get a fuel pressure gauge and install it on the schrader valve on your fuel rail. This gauge can be rented from some big box parts stores. Compare your readings to factory spec. Without verifying your actual pressure with a gauge, you are just "guessing" on fuel delivery.

Use this technique to check for any soft/stored codes in the computer.

http://www.go.jeep-xj.info/HowtoECUcodes.htm

 

It also back fires through the intake

 

got it all ready to go just got a couple of other litte things.


speedometer,gas gauge and temp. gauge arnt reading either.. any thoughts on that??