Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: Orex on February 24, 2008, 10:51:49 AM

Title: 89 Cheep Cherokee Problems Backfiring
Post by: Orex on February 24, 2008, 10:51:49 AM

My Jeep will start and run, but as soon as I hit the gas, the engine backfires.  I have replaces the CPS and the TPS.  What do I need to do next?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: cLAY on February 24, 2008, 11:52:05 AM

Have you messed with the distributor lately? If so did it get put back in its proper position? Are all the plug wires going to the correct plugs(none mixed up), are the wires in good shape(not cross firing to each other?).

Any vacuum lines popped off?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: big black dodge on February 24, 2008, 11:29:54 PM

you check for exhuast leaks and/or cracked exhuast manifold?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: Orex on February 25, 2008, 05:34:57 PM

I don't believe so but I will check.  By the way, the plugs you mean  are the firing order for the spark plugs right?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: Orex on February 25, 2008, 05:37:28 PM

Oh and is there any way I am supposed to adjust the CPS?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: rws on February 26, 2008, 03:19:31 PM

CPS is not normally adjustable.

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: Orex on March 11, 2008, 06:13:23 PM

None of that is the problem!!!   Anyone else have a suggestion?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: frenchy on March 11, 2008, 07:16:15 PM

Quote from: Orex on March 11, 2008, 06:13:23 PM

None of that is the problem!!!   Anyone else have a suggestion?

Vaccum lines and/or timing ?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: cLAY on March 11, 2008, 07:45:36 PM

We need more info. Did it just start or happen after doing work on it? What all have you tried/replaced.

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: NS-jeeper on March 11, 2008, 08:19:14 PM

Water in the gas?

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: yjcanibul on March 11, 2008, 10:04:40 PM

Quote from: cLAY on March 11, 2008, 07:45:36 PM

We need more info. Did it just start or happen after doing work on it? What all have you tried/replaced.

x2

is this a high mileage eng ,  is it gutless while on the gas and back firing ,  do you have a cat converter , did you have the timing chain off etc ...

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: frenchy on March 11, 2008, 10:14:41 PM

Is the Jeep grey, lifted with 35" tires ?  ;D

Check and/or replace the following:
Part # 4762592 is circled in red
Part # 53004838 is circled in green
Part # 53004868 is circled in blue

(http://inlinethumb47.webshots.com/43182/2975197890099977310S425x425Q85.jpg)

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: Orex on April 06, 2008, 07:55:06 PM

No, it is Blue and stock parts

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: unionjack on April 07, 2008, 08:07:49 PM

plugged catalytic converter? just athought

Title: Re: 89 Cheep Cherokee Problems Backfiring
Post by: BUKI on April 08, 2008, 11:05:22 PM

good one unionjack.
let it run for a while and se if the cat is red hot.  seen that happen before.