Can you help me? Please I need my Jeep for work

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  #1  
Old 04-29-07, 05:48 PM
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Unhappy Can you help me? Please I need my Jeep for work

Hi everyone, I have a 1994 Grand Jeep Cherokee 8cyl 5.2 engine. The Jeep runs fine for about an hour and then just shuts off suddenly after about 15 minutes it starts right up. I took it to two Mechanic shops and they keep telling me that when they let it run in their shop it does not cut off but as soon as I get it back, The Jeep cuts off again I replaced the Alternator, a new battery, ignition coil,and something called a Pick-Up(something in the Distributor cap). Both mechanics are tellig me my fuel pump is good. Now someone is tellimg me to get a Throttle Positin Sensor? I need my Vehicle to get back and forth from work. I am a Field Technician and will be willing to trade some computer skills for anyone, if they can just tell me how a can keep my beautiful Jeep running.

Please need help ASAP
 

Last edited by daniels366opt; 04-29-07 at 05:53 PM. Reason: mispelled words and I left out some information
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  #2  
Old 04-29-07, 06:09 PM
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Did it try to start after it dies? Does it try to crank?

If the mechanics told you the fuel pump is good, and the spark at the plugs, it very well could be the TPS (throttle position sensor).

Does a check engine light come on?
 
  #3  
Old 04-29-07, 06:25 PM
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and it seems like it wants to start but doesn't and then after about 15 or 20 minutes or sometimes longer.Yes the engine light comes on, I was reading a prior thread and someone had the same problem and he solved it by replacing the crankshaft sensor. do you think this is a possiblity?
 

Last edited by daniels366opt; 04-29-07 at 06:29 PM. Reason: left out information
  #4  
Old 04-29-07, 07:48 PM
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Sure, it sounds like it could be that or the TPS.
 
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Old 04-29-07, 08:07 PM
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has anybody ever run the codes on the computer? If there is not a hard code stored in the computer, there are shops that have computer reading devices that they hook into the computer and leave them there to record when something does go wrong.
 
  #6  
Old 04-30-07, 04:34 AM
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Smile Jeep cuts off

Also, you could have a vapor lock in the fuel system. When fuel gets too hot it vaporizes and it cant pump. If this is the case try applying some cold wet rags around the fuel lines and see if it starts back up. Be careful not to allow them to catch fire on anything hot,( exhaust). If this works try moving the fuel lines away from anything hot. Sometimes a weak fuel-pump might cause vapor lock.
 
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Old 04-30-07, 03:43 PM
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I can't honestly say I have seen any car that has fuel injection with the pump in the tank experience vapor lock. Since the pump pressurizes the line from the tank forward rather than the old sucks it from the tank, vapor lock has pretty much gone the way of.. well... the carburator.

Now I have seen an intermittant fuel pump problem that acted very similar to this situation.

Reading the computer codes would report a low pressure situation that would result from that.
 
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Old 04-30-07, 06:06 PM
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2 things come to mind...............#1 is the crank sensor...........If it's weak, it can lose signal when warm............#2 is the ECU........... If you have access to a scan tool.....Run the vehicle to failure and scan the puppy. First see if you have any data AT ALL coming from the ECU...........If you do , crank the engine and look for about 200-300 RPM while cranking
 
  #9  
Old 04-30-07, 08:12 PM
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can't find crankshaft sensor

Hi, fellas, I want to first start out by thanking all of you,who have took time out to assist me with my problem. I brought a Throttle possison sensor and a Crankshaft possision, although I but the TPS on with no problem, I can't not find the Crankshaft sensor, I had couple of people that say they are mechanics look and they can not find it either the Autozone and the manual shows a 1996 location. We could not find it. Can you tell me were it is located. on the 1994 Grand Jeep Cherokee 8cyl 5.2 again thank you



Daniels
 
  #10  
Old 05-09-07, 02:42 PM
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jeep crankshaft sensor location v8

Hi, I just replaced mine on a 94 V8 and posted a description of the sensor location being on the top right side of the bell housing behing the right head and above the muffler. Read my post for further info.
 
  #11  
Old 05-14-07, 07:12 AM
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Wink I found The Crankshaft sensor

Thank You eveyone for your assistance I have found the CPS, and I believe this is the problem, if only I can get to the screws they are hard to work with and get to I do not know what tool to use to get back there. But the important thing is that I have found it, and I know I will figure out a way to get to them two screws, so for this I thank you all and please keep up the good work,in the assistance you give to other people. You are trully one of a kind, and again if any of you who helped me, has any type of Computer problems, please feel free to contact me anytime. Thank you, Thank you
 

Last edited by daniels366opt; 05-14-07 at 07:16 AM. Reason: mispelled words
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