Question about 1999 Jeep Wrangler

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99 jeep wrangler

In the first quarter mile my jeep backfires like crazy enging goes in and out losing all power then regaining it it goes away after i floor it, but on re entry out of a store it happens all over again, no code comes up , mulitiple tune ups new exhaust manifold to no avail, thank's for you're help

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  • dinklil Jul 26, 2008

    have a 97 Wrangler and runs great for 1 mile then keeps loosing power and popping. Replaced fuel filter, cleaned tank and lines and still having problem. Engine light comes on after that mile also. After it warms up will run fine but light stays on

  • bigdaddyc Sep 09, 2008

    I have the same problem. Back fire and sputter on start up, but not every time, and cannot seem to find pattern of when it happens. Never has problem when mechanics drive it. It behaves like a malfunctioning TPS, and then is starts working. It seems like the jeep forgets it's settings and then remembers them. I have tried several TPS, lots of throttle body cleaner, lots of fuel cleaners in the gas tank. I had a cracked manifold when this happened, and replaced it with a pacesetter header.Wonder if it is a back pressure issue? I hear my fuel filter gurgle when I shut the motor down. Dealer said no big deal on wife's cherokee, but replaced it anyways under warranty.

  • bigdaddyc May 11, 2010

    I do have 150K mile, and it has been doing this for a long time. It also seems to gussle gas. I have a set of 31's but I am getting about 16 MPG when adjusting the mileage for the tire size difference from stock.

  • bigdaddyc May 11, 2010

    Mine backfires through the Throttle Body. What is the IAC? How do you check the O2 Sensor? I have no codes being dispalyed.

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How many miles down your TJ have?

backfire through exhaust or the intake manifold?

I would check:
1. 02 sensor
2. clean the throttle body thoroughly by decarbonizing it as well as cleaning the IAC and TPS.

what was done from the tune-ups?

Posted on Jun 22, 2008

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