Last post on Mar 12, 2013 at 1:19 PM
You are in the Jeep Wrangler
What is this discussion about?
Jeep Wrangler, Scheduled Maintenance, Steering, Suspension, Tires, SUV
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#1559 of 1886 1997 Jeep Wrangler
Jul 01, 2009 (10:27 am)
At various times while driving in on the highway my jeep will start to buck , run rough and backfire. I pull over to the side of the road and let it idle or turn the engine off for a ew minutes then start it up and it runs fine for a while.
The only time this happens is when I am on the highway, in 5th gear and not shifting.
If I am driving, shifting and changing speeds it does not happen.
Any ideas as to why this happens.
#1560 of 1886 Re: 1997 Jeep Wrangler [mjm1965]
Jul 01, 2009 (11:36 am)
Any codes being thrown or the check engine light coming on?
#1561 of 1886 Re: 1997 Jeep Wrangler [erickpl]
Jul 01, 2009 (6:03 pm)
Sometimes the check engine light comes on.
#1562 of 1886 Re: 1997 Jeep Wrangler [mjm1965]
Jul 02, 2009 (4:30 am)
Sometimes the check engine light comes on. No codes.
An illumination of the MIL is a cause for concern. It means that there's a problem that could possibly affect driveability.
When the light comes on the PCM generates a code so that you can see what caused the light to come on. You do have codes, or at least one.
#1563 of 1886 Re: 1997 Jeep Wrangler [mac24]
Jul 02, 2009 (9:37 am)
Run by AutoZone or a place like that and they should be able to plug into the OBDII port and get the code it is generating.
I'd place my money on a throttle sensor.
#1564 of 1886 Re: 1997 Jeep Wrangler [erickpl]
Jul 02, 2009 (10:07 am)
We had talked about it being the throttle sensor.
This was the first time its happened in a while. I am going to check the code and dig into it this weekend.
#1565 of 1886 Re: 1997 Jeep Wrangler [mjm1965]
Jul 06, 2009 (6:13 am)
TPS is an easy swap once you know where it is.
#1566 of 1886 7mpg in a 4cyl helllpp
Jul 07, 2009 (9:13 pm)
I have changed a lot of things in this jeep I changed the water pump the radiator the computer the map sensor I have regular 30x9.50 15 tires I have put octane booster injector cleaner and no mechanic knows what is wrong with my car and i literally get 80 miles on a one tank of gassss... hellp .. black smoke comes out of it when i rev the engine and it takes me forever to get to the speed of the highway
#1567 of 1886 Re: 7mpg in a 4cyl helllpp [jeepmaniac13]
Jul 08, 2009 (4:44 am)
..................................i literally get 80 miles on a one tank of gassss... hellp .. black smoke comes out of it when i rev the engine and it takes me forever to get to the speed of the highway
While many things could cause this, the bottom line is that the poor mpg and black smoke indicate it's running a very rich fuel/air mixture.
It could be as simple as a blocked air filter, or as complex as several bad sensors in combination with fuel system issues.
Take it to a competent professional shop.
#1568 of 1886 Re: 7mpg in a 4cyl helllpp [mac24]
Jul 08, 2009 (7:00 am)
ive taken it to a real mechanic and it comes up as a sensor o2 but i changed one of them and cleaned the other one