Question about 1993 Jeep Grand Cherokee
Could be faulty ignition. If a connection is loose then could fail at particular vibrations.
Posted on Apr 28, 2017
I don't know engine size? The fuel pressures I found was 31--39 psi, 92--95. I would use a gage and check proper fuel pressure.
How long since over-all tune-up? Any applicable trouble codes?
Posted on Apr 28, 2017
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
good morning to you and welcome to fixya.com. hope we can get you fixed here. just a couple of questions first? have you changed the fuel pump yet? if so where did you buy the pump from? your pump is actually building up to much resistence and is unable to overcome it in turn no power is getting to pump as needed. i have a grand cherokee with 230k so i love hearing that you have that many miles. lets keep you rolling. let me know and ill help you out.
Posted on Mar 07, 2009
SOURCE: 2000 Jeep Grand cherokee Laredo
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
Posted on Sep 27, 2009
Being injected, the control system varies fuel quantity and does not directly regulate air flow. Therefore, having black soot on plugs tells you that there is too much fuel going into the engine. The O2 sensor tends to react to, more than control that. Missing can be the result of plug fouling. Backfire may be the result of a too rich fuel mix permitting unburned fuel to enter the hot exhaust where it re-ignites.
Where I would look first in your case is to the manifold air temp sending unit and the coolant temp sender as well. If either or both are out of range the computer may "think" it is running a cold engine and therefore adding additional fuel for cold start up,and not switching to normal run mode when the engine reaches operating temp. Once the plugs foul the engine will continue to run poorly regardless of other conditions. You can test each component individually using either chilton or haynes manual as a guide. You will need a decent digital multi-meter to do the tests.
You can also have a code test done at most major parts stores, but often if sensors are not bad enough to set a code but together are causing a problem, you may not see anything except the O2 sensor.
There are other possible causes such as worn out injectors, but most often that won't happen in all cylinders at the same time. Do testing first, correct whatever you find and then make sure plugs are clean. If after running, the O2 sensor continues to register a fault, then replace it.
Good luck...any further questions are welcome and don't forget to rate answers!!!
Posted on Feb 22, 2010
Testimonial: "Thanks. We will try it."
Tips for a great answer:
Jun 11, 2015 | 2000 Jeep Cherokee
Jul 21, 2010 | 1993 Jeep Cherokee Country
Nov 21, 2009 | 1993 Jeep Grand Cherokee
Jun 19, 2009 | 2002 Jeep Grand Cherokee
Jun 01, 2009 | 1991 Jeep Cherokee Briarwood
Mar 06, 2009 | 2000 Jeep Grand Cherokee
Feb 26, 2009 | 1999 Jeep Grand Cherokee
Dec 21, 2014 | 1993 Jeep Grand Cherokee
77 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: