My Cherokee is a 4.0, has spark, has fuel pressure, new air filter, new fuel filter. Sometimes it will start and run fine and then a couple miles down the road it will die and not start again. Other times it will not start, it turns over like it is going to start, but then dies. I am at a loss, as it will run fine for a few days, and then it either will not start, or it starts and then down the road a ways it dies, and then will not start again.
Re: '93 Grand Cherokee intermittently starts and runs
Hi, I had simmilar problem with my 1993 JGC . I ran out of gas and it would not start until the next day. Then it will start and run until I put the brakes on tho stop and then it will die. It starts right back up. Ended up being the voltage regulator in the ECC/ECM. It is at the mechanics shop right now waiting for the ECC to come in.I will post a follow up.
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Your indications sound more like a clogged fuel filter or intermittant fuel pump. But it could also be your air supply! When was the last time you changed your air filter and fuel filter. I would start with those two first and then check the fuel pump.
My 95 Jeep GC had a similar problem when I was doing a lot of driving on dirt or gravel roads, and I had to blow out the air filter (with compressed air) often to clear the problem.
Having same issue with my 2000 grand cherokee. sometimes fuel pump will prime and car starts the other 50% of time no fuel pump noise only smaller radiator fan will come on and make vibrating whining noise. I have changed out fuel pump and filter as well as checked and ruled out all fuses/relays involved. Need help too
There are several possibilites.
When it dies does the Engine Light come-on and stay-on? If so there are codes which are present that can isolate/point you to a more specific problem.
Based soley on your description: I would first check your Spark Plugs, Wires, and Coil. When were they last replaced? If these are fine: When was the Fuel Filter replaced? Air Filter? Check the fuel pressure at the port located on the fuel rail in the engine compartment.
If those check out okay: I would check and/or replace the Idle Sensor and/or the Throttle Position Sensor.
Basic rules on bad idling:
1. Fuel - is there enough getting to the cylinders?
2. Spark - Is there consistent spark getting to all the cyclinders?
3. Air - Is there a air shortage = clogged air filter?
Let me know if this helped, or if you have additinal information or questions. Feel free to contact me a FixYa.com!
Have you tried to switch your car on, wait 3 sec's and then start the engine? reason: If the pressure in the fuel system went down very fast, it need some sec's to arrive the pressure it needs to start. Also possible: switch on, wait 2 sec's, switch off, on and start. This does the same I told above. If that works, change the fuel pump or let this item checked be a specialist (it's expensiv to replace it).
You have a good theory but haven't finished testing so you can verify it...check actual fuel delivery when in no-start...also probe the pump wire on the pump side of the harness and see if you are in fact not getting power to the pump all the time. (also in no-start). Don't test after it gets started, or testing will tell you what you already know...It runs fine once started...tests will then tell you it's fine (you know it's not) Problem itself could be anything from a bad connection somewhere to a balky pump.
Also check the vaccum hose from the fuel pressure regulator to the intake manifold, it is right on top, to the front right of the valve cover where the fuel lines attach to the fuel rail, there is a small vaccum hose that runs from the regulator to the intake manifold, I have a 93 grand cherokee limited w/ 4.0L 6cyl, it was hard to start at times, wouldnt start at times without starting fluid spray and had your symptoms at idle, running rough like it wanted to stall like it was out of gas, I had various opinions ranging from fuel pump was bad to the fuel filter to the fuel presure regulator, the fuel pump relay ,etc....after replacing the relay and having the same symptoms, some digging brought me to this vaccum hose, wich had a break in it, when it was replaced it allowed the regulator to have the correct fuel pressure output and solved all the afforementioned problems way cheaper than the suggested alternitives. good luck.
Could be a sensor.I'm thinking more along the lines of a fuel pump or fuel filter.If the fuel pump is going bad..similar symptoms.Would be advisable to install a pressure gauge at the engine,and check fuel pressure when it's acting up.