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  #1  
Old 08-26-2015, 10:20 PM
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Jeep Starting Issues

Hello All,
I have a 2001 Jeep Grand Cherokee that I replaced the 4.7 liter with another 4.7. I put all new gaskets in the engine, new spark plugs, starter, battery. Problem is it took me almost 24 months to do this so the gas is at least that old. After installing the engine I started it and it ran fairly well for about 20 minutes, water temp was good as was the oil. However, had a lot of white smoke out the tailpipe. Eventually the SES light came on and the engine quit and I haven't been able to get it started since.

I presume that it is the old gas that is causing the starting problems, if so, is there anything short of draining the gas tank and putting good gas back in. Any other ideas would be appreciated.

Thanks,
Scott

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  #2  
Old 08-27-2015, 08:48 AM
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Re: Jeep Starting Issues

Since the check engine light came on, most probably a fault code is set in the PCM. Use a scanner or do the key dance to see which fault code is set. For the keydance do the following: ignition switch off/run three times and leave in run at the third time. The odometer will show DONE when all ok, or a fault code(s).
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  #3  
Old 08-29-2015, 01:10 PM
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Re: Jeep Starting Issues

Sorry to be slow in posting my reply here. I tried the key dance method of displaying coded and I didn't gt anything. The odometer kept showing the mileage reading and never displayed a code or "done". Thoughts on what I maybe doing wrong?

Many thanks for the assist.
Scott
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  #4  
Old 08-29-2015, 06:23 PM
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Re: Jeep Starting Issues

Did you check all the fuses already. If the PCM is dead due to a blown fuse, the engine will not run and the keydance will not work
Do the volt and fuel level indicators work normally, or do they show 0? The last would be a sign of a dead PCM.
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  #5  
Old 08-31-2015, 09:23 PM
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Re: Jeep Starting Issues

I checked the PCM fuse (actually said PCM Battery) and it shows continuity. That is the only thing that says PCM under the hood.

Also the fuel gauge, oil pressure gauges and volt meter work fine. So I'm at a loss what the issue is. I checked the power to fuse block under the hood and am showing 12.4 volts to lead into the fuse block.
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  #6  
Old 08-31-2015, 09:41 PM
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Re: Jeep Starting Issues

There are three fuses in the PDC feeding the PCM: Fuse #6, #19 and #26. I would also swap the auto shutdown relay with the TCM relay for trouble shooting.
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  #7  
Old 09-01-2015, 10:17 PM
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Re: Jeep Starting Issues

Thank you so much for your help, it turned out that fuse #6 was bad. However, as a matter of maintenance I will be replacing all the fuses in the underhood module.

After the Jeep started, I did get P0202 code, which seems to indicate there might be a problem with injector 2. I'll start troubleshooting that next, but it seems like the Jeep will run even with the bad gas in it. If I can get it to run through the bad gas without dropping the tank, I'll be happy.

Any thoughts?

Again, many thanks for your advice. You were spot on.
Scott
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Old 09-01-2015, 11:43 PM
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Re: Jeep Starting Issues

First errase the memory and see if the same code comes back. If so, than i would start measuring the resistance of the injector, when i´m not wrong its somewhere around the 11-15 Ohm. You can also compare it to an other injector. When ok, then measure the wires to the injector for continuity and if ok, for short to ground.
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  #9  
Old 09-07-2015, 09:22 PM
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Re: Jeep Starting Issues

I replaced the injector and now the Jeep will at least idle. Still a bit rough, but I think that is because of the old gas issue. I've added Lucas Injector Cleaner, a bottle of HEET and some octane booster. Hoping that will let the gas burn well enough for me to drive the bad gas out the tank (hoping to do that over the next couple of evenings). Once I run the tank dry will then refill it with new gasoline. Obviously, I am trying to keep from removing the gas tank. Anything I should be concerned with regarding this plan?

Many thanks for the help on this. I have really appreciated all the assistance I have had on this problem. It has helped immensely.
Scott
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  #10  
Old 09-07-2015, 10:22 PM
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Re: Jeep Starting Issues

I don´t know how much fuel is left in the tank. It would probably be a good idea to drain this fuel instead of burning it of in the engine. I think that you can get a drain hose with a small valve, which would open the schräder valve on the fuel rail. When you than remove the fuel pump relay and put a wire between the slots 30 and 87, the fuel pump will run continuously and the fuel will be drained.
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  #11  
Old 09-08-2015, 02:02 PM
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Re: Jeep Starting Issues

I think I have about 7 - 8 gallons of fuel. I like the idea of pumping it out rather than running it through the engine. i will have to find a schrader valve to screw onto the fuel rail port. I do have a fuel pressure tester that has such a connection but it is not something I cannibalize for this.

Thanks for the help. I'll let you know how things work out.
Scott
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  #12  
Old 09-12-2015, 05:40 PM
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Re: Jeep Starting Issues

Continuing saga on my jeep is: I did drain the fuel tank as prescribed above. That worked very well. Had about 7 gallons of gas in the tank. I then replaced the fuel filter, added Lucas Fuel Injector cleaner and HEET to gas tank and filled it with fuel.

I drove it about 3 blocks and the engine died. The ASD fuse had popped (30 AMP). I had a spare 50 AMP and put it in and the Jeep started. Of course it threw off a SES code indicating something was wrong with the ASD Circuit, which I'm guessing is caused by the fuse popping.

The engine will idle, however it still has a miss in the engine, even with the new gas (I only got to drive it about 6 miles before I got called in from my play time ). At higher RPM the engine does seem to smooth out.

All the gauges are working, engine temperature is normal, oil pressure is 45 - 50 lbs, alternator is about 14.

I'm thinking I'll take it out for a drive to see if running it will improve the idle. But I doubt that it will.

Any thoughts or ideas would be much appreciated.
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