popping noise

[kmerian]

I have a 89 Jeep Cherokee 2WD with the I-6. Lately if I try to quickly accelerate, the engine sputters and pops, very rythmic (like a machine gun) with a big dropoff in power, but if I accelerate slowly, it is fine. My guess is the fuel pump, maybe?

[YellowXJ89]

Make sure your spark plugs are good shape. Then check fuel pump...

[markhamsr]

Originally Posted by kmerian

I have a 89 Jeep Cherokee 2WD with the I-6. Lately if I try to quickly accelerate, the engine sputters and pops, very rythmic (like a machine gun) with a big dropoff in power, but if I accelerate slowly, it is fine. My guess is the fuel pump, maybe?

before I spent the time and money on a pump replace the fuel filter!!
you can also run a presure check on the fuel system at the fuel rail [least ways you can on a 90 - 4.0

[tblack]

If it had a carb I would say that's a classic sign of an accelerator pump problem within the carb. The popping noise could be a spark retardation too so another thing would be to check the timing.

[kmerian]

I replaced the fuel filter and that did nothing to change the problem. A little further investigation revealed a bad fuel injector on the #2 cylinder. replaced that and fixed the problem.

[stevelock]

sounds like you need to clean the injectors.


didn't see the last post oppps