4.7 flooding and then stalling out - JeepForum.com
 
LinkBack Thread Tools
post #1 of 5 Old 05-01-2009, 07:18 AM Thread Starter
GeorgeTown
Registered User
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

GeorgeTown is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 05-01-2009, 08:12 AM
rm2001wj
Registered User
 
rm2001wj's Avatar
2001 WJ 
 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,228
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.
rm2001wj is offline  
post #3 of 5 Old 05-01-2009, 08:42 AM Thread Starter
GeorgeTown
Registered User
1999 XJ Cherokee 
 
Join Date: Apr 2009
Location: Miami
Posts: 11
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
GeorgeTown is offline  
post #4 of 5 Old 05-01-2009, 11:01 AM
rm2001wj
Registered User
 
rm2001wj's Avatar
2001 WJ 
 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,228
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.
rm2001wj is offline  
post #5 of 5 Old 05-02-2009, 10:04 PM Thread Starter
GeorgeTown
Registered User
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



GeorgeTown is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1993 grand waggon 5.2L V8 flooding out ECMUDSLINGER ZJ Grand Cherokee Forum 4 12-01-2009 10:35 PM
4.7 dies......flooding? CHm0074 ZJ Grand Cherokee Forum 7 07-21-2009 07:34 AM
My 95-ZJ is stalling --- Just like yours... 95ZJ-tilshedies ZJ Grand Cherokee Forum 19 03-03-2008 12:32 AM
ZJ Flooding on the passenger side floor. Need advice JimJimBinks ZJ Grand Cherokee Forum 15 06-24-2007 12:10 AM
'05 WK Flooding? alinn ZJ Grand Cherokee Forum 5 06-16-2005 02:59 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome