Loss of Power
1989 YJ ... 2.5L, 117,xxxx miles ... Brand new fuel pump. Jeep unforutnately only gets driven every couple months. Noticed this problem the last time i had it out and again this past weekend. Jeep always starts up initially and runs well. After a few minutes of running though, the jeep loses power. You press on the gas and the RPM's increase a little than die down immediately. You cannot feather the gas at all, as it just keeps dying. Upfront i can hear a hissing type sound, also have a smell when this happens. Smells is not burning per say, but more of a strong exhaust type smell. After this happens, if i turn the key off and shut the motor down, as soon as i turn the key and run the motor again the problem is gone. I get full power again upon restarting. Anyone have any ideas where to start with this? Thanks
An '89, so it's carburetoreted - yes? Sounds like it's out of adjustment. My '87 had a similar smell. Adjusted the Carter POS and it runs like a champ. Thing is, I have to readjust it every month or two because the idle mixture screws work their way loose. CAN'T WAIT until Uncle Sam gives me my money back so I can get the Motorcraft 2150!
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ
The "sideways" build thread:
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Vacuum or exhaust leak. Both play he'll with O2 sensor readings back to ECU which adjusts the mixture if fuel to air. So it becomes a performance problem. Find and repair the hissing sound and see what that does. The TBI is usually really dependable.
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
AF Jeep Club Tail #184
Check your vacuum lines too. I have learned the even a pinched line can cause issues like this. So not only check for leaks but check for a pinched line also. I know I am MPFI and you are TBI but alot of the troubleshooting is the same. Particularly check the map sensor vacuum line. The TPS uses it as a reference. For example When I replaced my enfine i broke a ccv vacuum line. I capped it off temporariliy and it threw a TPS code. Once I fixed the line no more code.
Originally Posted by Que89YJ View Post
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