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Unread 05-01-2009, 08:18 AM   #1
GeorgeTown
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1999 XJ Cherokee 
 
Join Date: Apr 2009
Location: Miami
Posts: 11
4.7 flooding and then stalling out

I have a 1999 Grand CHerokee and my mechanic just rebuilt the motor and now it runs great but after about 20 minutes of driving the engine will just get flooded out and stall!

He would have to take out the plugs and they will be soaked and then dry it out and then it will start

He tried changing computers and sensors and all kinds of stuff and it keep doing it



He rebuilt the engine in 2 days but has been stuck on this for a month!


Anybody ever seen this before?

Thanx for reading
Hope you can help
George

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Unread 05-01-2009, 09:12 AM   #2
rm2001wj
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Location: Memphis, TN
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If your description is accurate, the MIL should be on, and there should be one or more trouble codes stored in the PCM (computer). Those codes will give clues as to what is wrong. If there are no codes, then it is certain that the PCM is bad. Pull the codes and post the results.
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Unread 05-01-2009, 09:42 AM   #3
GeorgeTown
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Join Date: Apr 2009
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the only codes that are coming up are the "Crank Sensor" and he changed the crank senor and the engine speed sensor code.

He said that he already changed the PCM
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Unread 05-01-2009, 12:01 PM   #4
rm2001wj
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When you say the plugs are "soaked," I'm assuming that you mean soaked with gas and not coolant. Are all the plugs soaked or just certain ones?

If there so much fuel is being injected that the engine stalls, there should be one or more cylinder misfire codes. Also, there should be a code (due to O2 sensor signals) indicating a rich mixture. Running with a very rich mixture will kill an O2 sensor, but then there would be a code for the bad sensor. Fuel injector synchronization is done by the PCM using the camshaft position (CMP) sensor. A bad CMP sensor will mess up the fuel injection, and usually, but not always, a CMP sensor code will be thrown.

The crank sensor and "engine speed" sensor refer to the same sensor, the crankshaft position (CKP) sensor. That sensor needs to be working correctly if ignition timing is to be correct. Be sure that there is no longer a crank sensor code. If there is, that really needs to be fixed. BTW are you using a code reader and can it erase codes? Whenever you replace a sensor you need to erase any codes before you start up the engine again.

The PCM uses changes in the CKP sensor signals to detect misfires. If the sensor is not working correctly, there is not likely to be any misfire codes.

There still could be a problem with the PCM. Was the replacement new, or rebuilt, or used? It goes without saying that the replacement should be for 99 model with 4.7.
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Unread 05-02-2009, 11:04 PM   #5
GeorgeTown
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1999 XJ Cherokee 
 
Join Date: Apr 2009
Location: Miami
Posts: 11
It has been fixed!!

Turned out to be a cam sensor!!!!
Switched out cam sensor and the Cherokee is running great and I was suprisesd the take off it has when you hit the gas!

Thanx for trying to help



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