1989 Jeep Wrangler, 2.5L, Manual trans. When I drive down the road and keep the same throttle position it will die out (bogs down like i shut it off) , but if I give it more throttle it spits and jerks and comes back to life. What is the problem?
by 
Tony Funk
ANSWERS: 5
-
Check the timing belt. If the unit has interference timing is it critical to replace the timing belt and the water pump, because timing belt failure may result in bent valve stems, requiring a new engine head which may cost up to $1000.
-
Check your Fuel filter, Throttle position sensor, and Crank position sensor. I had the same problem and changed all three and problem was fixed
-
There are so many different things that could cause those symptoms. That could range from dirty fuel filter to bad camshaft. The guy who taught me to work on cars said to always start with the cheapest and work to the most expensive, that way you won't find out that the problem was a fuel filter after you've replaced the cam or done a valve job. I'd start by checking ALL fuel filters and the air filter. Many cars have more than one fuel filter, often one in the tank and one on the carbuerator or throttle body and sometimes one in between. I'd replace the PCV valve or breather too while I was at it. Next, I'd check vaccuum lines. There is usually one from the transmission to the carbuerator or throttle body that tells it "I'm shifting gears, you need to adjust the fuel mixture." If that is off, cracked or loose, it can cause the symptoms you list. I'm thinking that if it has an O2 sensor, that might cause those symptoms too. If its none of the above, then you might have to start looking at more expensive fixes like timing, timing belt or chain, camshaft or valves.
-
dirty and or weak injectors...causing it to starve for fuel use some seafoam in your tank and run it on the highway for a few hrs at high speeds..you will see some greish white smoke for a few momments as well as some black smoke due to cleaning the injectors and valuves..
-
I would check your fuel line. make sure its not bent or kinked. This happened to my jeep and I spent a good amount of money replacing things that didnt need replacing. And it ended up being the fuel line . Buying and forming a fuel line isn't that expensive. Good luck and let me know how everything goes.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC