Problems starting

Tiny
JROSE1017
  • MEMBER
  • JEEP CHEROKEE
I have a 94 Jeep Grand Cherokee Laredo w/235,000 miles. It has been having some problems starting (not all the time). It turns over fine, I have power, there is plenty of gas (you can usually smell it) but it doesn't seem to catch. Its been in the shop 3 times and they can't seem to figure it out unless it does it while its in the shop and of course while its there it starts right up. I had thought it had something to do with being under a 1/2 tank but it is now occurring w/a full tank.
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Saturday, January 6th, 2007 AT 3:31 PM

3 Replies

Tiny
SERVICE WRITER
  • EXPERT
Sounds like a lack of spark perhaps, since you smell raw fuel. Although basic, how old are the plugs and wires?

How often have the intake valves been cleaned?
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Saturday, January 6th, 2007 AT 4:52 PM
Tiny
JROSE1017
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I'm not sure how old the plugs or wires are I just received the Jeep as a gift. Would a simple tune-up possibly fix the problem.
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Saturday, January 6th, 2007 AT 5:01 PM
Tiny
SERVICE WRITER
  • EXPERT
JROSE1017,

Is this a 4.0 motor :

I can't say a simple tune up will resolve this.
I don't know the history of it, and don't have it here.

I'll say that it would be a very good idea regardless if it needs it to correct your problem.

It is frustrating to help when I work in this situation, but rewarding when we have success
:).
Was the fuel pressure checked? What was it?

Intake valves?
I would try what I call an air induction service.
I like to use castle hydroblast. You spray it into a vacuum line such as the brake booster line if nothing else is accessible. Full spray for 3 minutes, stall the engine with it or have someone kill it while your spraying. Let it set for a few hours then take for a short drive in low gear, revving the rpms to help break it up. First use Castle cleansrite to clean the throttle bore. Try to get the throttle plates scrubbed good with a brush, while your spraying. Use a rag to wipe the carbon out between brushings. Seafoam is another good product, but smokes a lot.

IF you can't find Castle, here is my rep's email:
robw@castlepackspower. Com

A professional fuel injector cleaning may also make a difference.
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Saturday, January 6th, 2007 AT 9:38 PM

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