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v10 excursion problems!!!

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Old Nov 3, 2009 | 06:01 PM
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Unhappy v10 excursion problems!!!

hey guys i need some help in a bad way...my excursion had been to 4 shops and has been sitting for 7 months now...when you drive the thing and pull up to a stop light or a stop sign and prepare to stop and when you do stop the motor lugs down to around 400 rpm and wants to stall and sometimes does and when you pull away it shifts down to first,so its like it stays in second while your on the break and when you let off the brake pedal and start to roll it shifts down...it also at an idle in park stalls and misses every once in a while...sounds like a machine gun sound at an idle....iac has been changed,,,maf has been changed,,,cops have been changed,,,,speed sensors have been changed.....check engine light is on but registering no codes? tranny shop ran the tranny for codes but came up with nothing....im at wits end trying to fig this out...could it be the main computer? i dunno whats left so hopefully someone out here can help
 
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Old Nov 3, 2009 | 06:16 PM
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Originally Posted by whiteexc22
check engine light is on but registering no codes?
If the computer isn't giving you codes then either there is a wiring problem between the PCM and the OBD connector, the reader doesn't work, or the PCM is bad.

So that's one problem. From your description is sounds like the torque converter is not unlocking when you come to a stop. The PCM controls torque converter lockup, so either the computer is not doing its job, it's getting bad information from a sensor, or it's not able to control lockup like it should.

I think you're right, you should probably replace the computer if you can't pull the codes from it after eliminating the other possible causes I mentioned.
 
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Old Nov 3, 2009 | 07:01 PM
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thx for the reply.....i thought about the convertor but then why would it miss and stall why its in park....unless im having 2 diff problems....the scanner is a snapon computer and is not picking up codes so i was thinking that the trucks computer might be failing
 
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Old Nov 4, 2009 | 11:32 AM
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Unless the miss and stall are computer-related, which is certainly possible, then yes you have two problems. But I would fix the big one first, lots of times the smaller ones will go away when you fix the larger problems.
 
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