I have a '96 Grand Cherokee w/5.2 V8. When I accelerate quickly from a dead start, the vehicle will hesitate for a second or two before it gets going. After that, it accelerates smoothly and runs strong at high speed. I took it to the dealer and he said the fuel pump was bad because the pressure was low. I have read about Jeeps being notorious for bad fuel pumps, but it seems it usually shows up as hard starting/no starting, rough idle, and/or stalling out. In fact, I replaced the fuel pump about 4 years ago because it wouldn't start. It seems to me that if the pressure were low that I would have other problems like poor performance at high speed. Aside from the hesitation from a start, it runs fine. I've changed the spark plugs, wires, fuel filter, air filter, PCV valve, cleaned throttle body, cleaned IAC passages, and replaced O2 sensor. I've heard there was a TSB about updating the software in the PCM for a similar problem. The dealer said that it wasn't necessary, but the PCM has never been updated. Any thoughts?
- posted
20 years ago