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1998 Jeep Laredo Engine rotates but will not start

Tiny
CEDNUT
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE LAREDO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 149,000 MILES
I have a 1998 Jeep Grand Cherokee Laredo with an inline six-cylinder. Sometimes when I drive, I can hear a rattling noise coming from the back of my car and my engine shuts off. And sometimes it don't rattle my engine just stops while I'm driving. Then It's hard for me to start it sometimes. The engine rotates but will not start. I put in a new fuel pump and new spark plugs and new wires for the spark plugs too. I'm still having the same problem. I get some back fire sometimes too. But I pump my fuel peddle to get it started sometimes.
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Thursday, February 19th, 2009 AT 7:27 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The engine rotates but will not start. Do below to determine if its fuel or spark problem.

Get a starting fluid or ether better off gas in a spray bottle and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it
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Thursday, February 19th, 2009 AT 8:28 PM
Tiny
CEDNUT
  • MEMBER
  • 12 POSTS
I sprayed B-12 Chem Tool carb & throttle cleaner into the throttle body and it started and died after 15-30 seconds. I repeated the process three times. I took the air intake off the throttle body and put it on after I sprayed it with the B-12 Chem Tool cleaner. It had a longer idle time afterwards but it was very slow and shut off after 30 seconds. What can I do now?
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Thursday, February 19th, 2009 AT 9:45 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lets check the fuel pressure and if okay find the idle air control valve and clean it out and see what happens
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Friday, February 20th, 2009 AT 12:38 AM

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