1998 Jeep Laredo Engine rotates but will not start

Tiny
CEDNUT
  • MEMBER
  • 1998 JEEP LAREDO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
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 carb & throttle 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 10:32 PM

13 Replies

Tiny
RACEFAN966
  • EXPERT
Ok first a couple of questions to better help you. How old is the fuel filter? Have you checked fuel pressure? I am thinking you need a fuel pump and with that you should replace the fuel filter. Get back to me with what you know and we will go from there.
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Friday, February 20th, 2009 AT 10:22 AM
Tiny
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  • MEMBER
I didn't check the feul pressure. I don't know how?

I bought a new fuel pump kit last October 2008. When I changed the fuel pump I also changed the fuel filter because there is a fuel filter kit or straner on the bottom of the fuel pump in the 1998 Jeep Grand Cherokee Laredo model. I think I need a new fuel pump assemble. The fuel pump assemble was clean because I check it last weekend. I bent the fuel pump assemble float gauge downward about a quarther of an inch before I reassembled it back together. That may be throwing the gauge off.

But when I bought this used vechical It would never start the first time I turn the ignition. The engine turns, & I would get it to start the second or thrid time. Sometimes it takes me 5-7 simestimes to start it. (Note: I put in new spark plugs last week, new fuel pump Oct. 2008, oil change last week)

Last night, I sprayed gas into the intake carborator then tried starting it again. The engine ran on a very slow idle under 100 RMP for 30 seconds and stopped. Afterwards the CHECK GAUGES LIGHT CAME ON!

This morning when I first tried to start it. As I turned the ignition the engine was turning so slow, it just stopped with no power. I turned the ignition again, it sounded weak the engine didn't turn over and it shut off. I spraded gas into the intake carb and PUT GAS INTO THE FUEL TANK. Then I put a Automatic Battery Starter on my battery and the car started up!
(Note: My fuel tank already had gas in it.)

I was able to drive off and go to work. But when I got to work it shut off as I was parking at a low idle speed. I started it back up 7 seconds after it shut off to make sure it can start up after work.

I was able to drive home but I would put it in nuetral to keep the engine idle at 100 RPM just in case it stops at a low idle speed at stop lights.

I hope this helps alot? Thanks I appreciate
your help, Cedric :)
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Friday, February 20th, 2009 AT 7:23 PM
Tiny
RACEFAN966
  • EXPERT
The fuel filter is not on the bottom of the pump that is the strainer for the pump. There is no fuel filter on you model of jeep sorry forgot. My 99 has a filter but yours does not. If it does have one this is what it will look like it is above the rear diff infront of the fuel tank. Get back to me and let me know if you have a fuel filter on yours or not and is your jeep a grand cherokee or not. Also call around to your local parts store or rental places and see if any of them rent a fuel injection pressure tester. Here is what it should look like if you have fuel filter.


http://www.2carpros.com/forum/automotive_pictures/249564_783361_1.jpg

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Saturday, February 21st, 2009 AT 9:40 AM
Tiny
CEDNUT
  • MEMBER
No I don't have a fuel filter at the bottom of the fuel tank at all. I need to get a pressure tester.
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Sunday, February 22nd, 2009 AT 4:29 PM
Tiny
RACEFAN966
  • EXPERT
Call and see if any of you local parts stores or rental places happens to rent one so you can find out what the actual fuel pressure is ok. Get back to me with what you find. Thanks
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Monday, February 23rd, 2009 AT 2:20 PM
Tiny
CEDNUT
  • MEMBER
Ok, I'll get back with you on the fuel pressure.

Thanks, Cedric
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Monday, February 23rd, 2009 AT 11:13 PM
Tiny
RACEFAN966
  • EXPERT
Ok then we go to the next step from there.
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Tuesday, February 24th, 2009 AT 10:25 AM
Tiny
CEDNUT
  • MEMBER
I have the Jeep Grand Cherokee Laredo 6V 4.0L

I got a fuel pressure tester and it read 43 PSI when I let it idle. What's next?
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Friday, February 27th, 2009 AT 5:57 PM
Tiny
RACEFAN966
  • EXPERT
OK I think we need to test the TPS so if you have digital multi meter then get back to me and I will look up the test procedure and we will see if there is anything wrong with it.
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Saturday, February 28th, 2009 AT 9:34 AM
Tiny
CEDNUT
  • MEMBER
What's the TSP?
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Saturday, February 28th, 2009 AT 4:20 PM
Tiny
RACEFAN966
  • EXPERT
This is the throttle possition sensor. It tells the computer how far open the throttle is. Now if you have a digital multi meter we can run a test on it to see if it is good or not. Get back to me.
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Saturday, February 28th, 2009 AT 8:11 PM
Tiny
CEDNUT
  • MEMBER
I have a 1998 Jeep Grand Cherokeo Laredo V6 4.0L I got a diagnostic at Chrysler. They told me I need a new Cam shaft position Sensor or Chrank shaft position sensor & a Pick up Coil. I installed the parts in myself. But while I was taking off the distributor cap I strip the screw on the right so I got a new distrbutor cap.

But to replace the old one I had to take the distributor shaft with distributor assemble out because the screw broke off into the distributor assemble on the right side.

After I took it out I put it back in but my Jeep did not start. So I had to take out the distributor shaft again and put in 180 degrees the opposite direction.

My Jeep started but it hesistates. When I accellarate it hesistates at 1500 RPM and it puts. I can hear the air putting in the muffler. What can I do?
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Wednesday, March 25th, 2009 AT 11:09 PM
Tiny
CEDNUT
  • MEMBER
I have a 1998 Jeep Grand Cherokee Laredo 6V 4L.
I just bought and installed a new water pump, thermostat, water tempreture sensor, & serpentine belt yesterday.

When I warm it up and let it idle for about 10-15 minutes. The tempreture gets past 210 degrees F then slowly goes to 260 degrees F and my check gauges light comes on. Also when I turn the ignition off the pressure from the radiator forces the antifreeze back into my coolent resivor and some of the coolant leaks out of the radiator cap. It has a brown color when it goes back into my coolent resivor. This have been going on a week ago before I replaced the parts I stated above.

The hose that connects from the radiator to the thermostat housing gets hot and tight when the engine reaches 220-230 degrees F.

I bought a thermostate from autozone that opens up at 195 degrees F.

Could you please help?

It would be greatly appreciated.
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Tuesday, June 16th, 2009 AT 6:25 PM

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