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Nov 8, 2010 | 09:46 PM

#31

goblinish15

Thread Starter

Senior Member

Joined: Nov 2009

Posts: 539

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From: McCall,Idaho

Year: 1991

Model: Cherokee

Engine: 4.0L high output with compressed valves

Quote:

Originally Posted by fishfast41

5 will getcha 10 that the timing chain went. Gunshot noise was a backfire. Pop the distributor cap, have a buddy watch to see if the ignition rotor turns as you crank the motor over. First thing I would check.

The ignition rotor turns i just replaced the distributor cap and all the wires and connections going to the spark plugs..............? haha wtf

Nov 8, 2010 | 10:06 PM

#32

powerslave1966

Junior Member

Joined: Feb 2010

Posts: 79

Likes: 0

From: McAllen, Tx.

Year: 96

Model: Grand Cherokee

Engine: 4.0L

Does that model year run cats and O2 sensors? I'd pick it up from there if you say the ignition rotor is turning...Check the cat converter and O2 sensors IMO before you start buying all kinds of stuff to see what works...

Nov 8, 2010 | 10:10 PM

#33

goblinish15

Thread Starter

Senior Member

Joined: Nov 2009

Posts: 539

Likes: 0

From: McCall,Idaho

Year: 1991

Model: Cherokee

Engine: 4.0L high output with compressed valves

Quote:

Originally Posted by powerslave1966

02 sensors.......................

Nov 8, 2010 | 11:08 PM

#34

powerslave1966

Junior Member

Joined: Feb 2010

Posts: 79

Likes: 0

From: McAllen, Tx.

Year: 96

Model: Grand Cherokee

Engine: 4.0L

Quote:

Originally Posted by goblinish15

02 sensors.......................

Oxygen sensors, they are used to monitor air/fuel mixture and cat converter performance...

I was having trouble with my ZJ, backfire sounds from the bottom of the vehicle, loss of power upon accelaration (no go), hesitation, stuttering, hard starting, you name it...changed out the O2 sensor (Oxygen Sensor) and now its running like a champ.....no issues and a huge improvement in MPG's... (Miles Per Gallon)...