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Unread 07-09-2012, 07:12 AM   #1
ledtheway
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Back fire
So I have a 97 wrangler with 121k. It is spiting and sounds like it is back firing thru the carb but I know that there is no carb. It is almost like it has a hiccup. Anyone got any ideas???

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Unread 07-09-2012, 07:59 AM   #2
Mishimoto
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Do you have any codes in it? Does it backfire constantly or just after you let off the gas?
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Unread 07-10-2012, 11:29 AM   #3
ledtheway
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So I went and hooked it up to the dyno. The read 21. I was told the throttle body censer and the GPS censer. Do you think that could be it? Also he wants to charge me $550 to do both. What do you think???
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Unread 07-10-2012, 03:20 PM   #4
Mishimoto
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Was it a TPS (throttle positioning sensor) that he said was bad?
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Unread 07-10-2012, 03:29 PM   #5
ledtheway
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Yes
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Unread 07-10-2012, 03:30 PM   #6
ledtheway
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Code 21???
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Unread 07-11-2012, 07:16 AM   #7
Mishimoto
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I'm guessing you have the 4.0 six cylinder?
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Unread 07-11-2012, 09:25 AM   #8
ledtheway
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Yes.
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Unread 07-11-2012, 03:20 PM   #9
Mishimoto
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Do you have code 21 from pulling the codes using the key on key off method or do you have a P0121 from a handheld scanner that plugged into your OBDII port?

Also,what do you mean by the GPS sensor?
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Unread 07-11-2012, 04:04 PM   #10
ledtheway
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I took it to a shop and they plugged it in. The code on there hand held read 21. I am not really sure what the GPS censer is that is just what he told me. I am not sure what it is. I want my jeep fixed lol
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Unread 07-12-2012, 07:19 AM   #11
Mishimoto
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I'd take it to another shop, and have them scan it. Ask them if they can write down the codes with the cost to fix the issue(s). $550 seems steep for just replacing a throttle positioning sensor (TPS) if that is the only thing wrong.

A handheld scanner for OBII vehicles should give P-codes that are 4 digit, so your 21 has me confused. They should have said it has a P0021 or P0121, etc.

Using the Jeep's computer, you only get 2 digit codes, like a 12, 21 or 55.
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