I have a problem with my grand cherokee laredo v8 1998 the problem is when its on idle it idle perfect buth sudenley the pump star making a noise and the noise goose high the fuel preshure drops and the engine stops or it start thumbling wath kuth that bee thanks

Sounds like a fuel pump issue.

It could be that your crank sensor needs renewing

Check the Fuel Pressure, you may have a bad fuel pump.

Check audibly the fuel pump. It will run for 3 seconds when ignition is turned on, but engine not started. If it makes noise, you could check for pressue at the fuel rail. There is normally a schrader valve you can press. Tske care, fuel under pressure will come out when pump is ok.
if ok, check for eventual fault codes with scanner.
could be crank sensor.

Replace idle up motor or sensor depending on what they call it

It may be the radiator fan making all that racket. Usually when the engine is cold, the thermal fan clutch allows more "slip" --- this allows the fan to turn slower than the water pump pulley (less load on the engine). When the fan clutch detects more engine heat, it reduces slippage of the fan clutch and this results in the fan turning "faster". It's actually turning at the same speed as the water pump pulley. The "roaring" noise is the result of the fan pulling in more air through the radiator.

If the noise is present at all times, whether or not the engine is hot or cold, then the fan clutch might be malfunctioning.


I hope this helps.


Have a nice day !!!

Having same issue with my 2000 grand cherokee. sometimes fuel pump will prime and car starts the other 50% of time no fuel pump noise only smaller radiator fan will come on and make vibrating whining noise. I have changed out fuel pump and filter as well as checked and ruled out all fuses/relays involved. Need help too

im trying to understand your english and i can not understand what your are telling me??????????but try the pump solinoid its sounds as if its gone.adrian,,,,,,,,,

Change your fuel Filter. Start there,If that does not work you can drop tank and clean up screen. if that dont work then id go with regulator. I would do fuel filter first

sounds like you have a problem with one of your lines on your power steering or one of its components. the grinding noise could also be one of your pulleys that have gone bad too. check your steering assemby gear box.