No power and backfire

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Oct 21, 2012 | 11:01 PM

#16

rrich

Senior Member

Joined: Aug 2011

Posts: 760

Likes: 6

From: Landers, CA

Year: Several

Model: Cherokee

Engine: 4.0

YEAR, and ENGINE would help!

what brand plugs

Oct 21, 2012 | 11:37 PM

#17

moparnj

Junior Member

Joined: Oct 2012

Posts: 60

Likes: 3

From: Central NJ

Year: 01

Model: Cherokee

Engine: 4.0

start over

your backfire is typicaly going to be a mecanical failure or a timing problem. its pretty clear that if your problem is still unchanged with the parts you put on so, it would be perfectly reasonable to rule out all repairs you have done and now to question the quality of them. start over from the start with simple diag, is backfiring out the intake or exhaust, under what throutle position, does it idle, how often does it backfire and at what rpm?

Oct 22, 2012 | 04:27 AM

#18

rrich

Senior Member

Joined: Aug 2011

Posts: 760

Likes: 6

From: Landers, CA

Year: Several

Model: Cherokee

Engine: 4.0

Whoever told you BOSCH plugs was OEM LIED!

I'm surprised you didn't have trouble with them long ago.

Look at your underhood label to see what the factory used.

Oct 22, 2012 | 05:37 AM

#19

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Quote:

Originally Posted by rrich

YEAR, and ENGINE would help!

what brand plugs

Mark the calender, Don agrees with Rich!

Pretty safe bet it is some sort of Cherokee. Guess he said he has more than one 02 sensor, so he's Not Renix, and not 99-02, probably not Diesel or 4cyl.... I'm gonna guess a 91 to 98 4.0 with an automatic? (just a probability stab at the trans). Oh..the problem...I forget....

Oct 22, 2012 | 06:43 AM

#20

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Quote:

Originally Posted by DTarve23

My Jeep did the exact same thing you are describing and beleive it or not it was the O2 sensor in the cat . the check engine light never came on until it got to the point that it would die every time I came to a stop

Dt>, pretty sure the down-stream 02 doesn't affect the running, it's just a smog thing. That said, it's sensor feed, and heater power might be shared with something that maters, but it's input can only signal a cat problem...I think.

Last edited by DFlintstone; Oct 22, 2012 at 06:45 AM.