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Author Topic: 89 Cheep Cherokee Problems Backfiring  (Read 1220 times)

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Orex

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89 Cheep Cherokee Problems Backfiring
« 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?
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Offline cLAY

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #1 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?
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Offline big black dodge

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #2 on: February 24, 2008, 11:29:54 PM »
you check for exhuast leaks and/or cracked exhuast manifold?
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Orex

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #3 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?

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Orex

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #4 on: February 25, 2008, 05:37:28 PM »
Oh and is there any way I am supposed to adjust the CPS?
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Offline rws

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #5 on: February 26, 2008, 03:19:31 PM »
CPS is not normally adjustable.
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Orex

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #6 on: March 11, 2008, 06:13:23 PM »
None of that is the problem!!!   Anyone else have a suggestion?
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Offline frenchy

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #7 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 ?
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Offline cLAY

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #8 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.
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'93 ZJ, 5.2L, lifted/locked/36s..<gone>
'98 5.9er 4.10s,locked,LA,WJ knuckles

Offline NS-jeeper

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #9 on: March 11, 2008, 08:19:14 PM »
Water in the gas?
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yjcanibul

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #10 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 ...

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Offline frenchy

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #11 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


« Last Edit: March 11, 2008, 10:22:09 PM by frenchy »
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Orex

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #12 on: April 06, 2008, 07:55:06 PM »
No, it is Blue and stock parts
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unionjack

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #13 on: April 07, 2008, 08:07:49 PM »
plugged catalytic converter? just athought
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Offline BUKI

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Re: 89 Cheep Cherokee Problems Backfiring
« Reply #14 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.
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