Another backfiring/ hesitation thread....89 2.5 -

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post #1 of 3 Old 08-23-2013, 08:39 AM Thread Starter
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1989 YJ Wrangler 
Join Date: Mar 2013
Location: Bowling Green
Posts: 262
Another backfiring/ hesitation thread....89 2.5

Alright guys I've read and read about this problem but it seems as if my situation is a little more unique than the standard hesitation/ backfiring thread.

So yesterday I started my 4 hour roadtrip in the old girl and she was running like a top. Cuising in 5th gear at 75 mph doing 2900 rpm and with the occasional 4th gear pass, nothing too crazy. Well the first 3 hours of the 4 hour trip where great. (I also stopped and filled up at shell at the 2.5 hour mark). Well about 45 mins out of my destination **** seemed to hit the fan. She would bog down and hesitate to about 55 miles per hour them I would change to 4th gear and every time with that chance she would backfire and I would barely have enough power to maintain speed. Then she would act fine and run great for a minute then do it again. I was almost full on gas and had been driving her for the better part of 3 hours, so my question is what could possible be causing this?

1 if it where a worn timing chain, wouldn't it be plenty heated up by the first hour let alone he third hour and start showing play? And besides the hesitation was intermittent so wouldn't that rule it out?

2 cat. Wouldn't the same thing go for the cat? Wouldn't it run like crap the whole time? I stead of the third hour of the trip?

3 tps, I just replaced my tps a month ago, could your tps go bad I'm such a short time?

4 I was using good gasoline from shell, so I don't think bad gas was the problem.

I'm at a loss on this one guys. Thanks for the help!

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post #2 of 3 Old 08-23-2013, 11:44 AM Thread Starter
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1989 YJ Wrangler 
Join Date: Mar 2013
Location: Bowling Green
Posts: 262
Bump anyone? I need to get her back on the road Sunday and some advice would be nice!
Thanks all
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post #3 of 3 Old 08-23-2013, 12:24 PM
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
Posts: 22,543
Cat could be intermittant because of loose material is basically bouncing around in the cat blocking the exhaust. The timing chain is an easy check by looking at the distributor and moving the crank with the pulley nut until you see the rotor moving then move it the other direction until you see the rotor move. Shouldnt be move more then about 1/4" or so. Check for codes. Check the distributor and make sure its tight and check the map vacuum like for leaks.
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backfiring , hesitation , intermittent , running poor

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