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Engine falls when you kick it down


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Posted

Hi guys.  Need a little help please. Got an 06' chev 2500HD 8.1L, its intermittent issue, some times when it kicks down or when power is demanded, it kicks down but then near dies... loses power I have to back out of it and baby throttle it back to speed.  If I'm on cruise control it will kick the cruise out as well.  No codes!!  Other times it's perfectly fine you can floor it and it kicks down and goes.  I'm thinking ECM?  Or BCM?  It has a new fuel pump in it.  Because it doesn't do it all the time I'm thinking electronic issue!?  

Thanks!

Posted

Intermittent conditions are tough.. Start with the basics.. check all power and ground connections.. starting at the battery..
Replace modules only when you are sure they have failed ..


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Posted
23 minutes ago, GM Fan said:

Hi guys.  Need a little help please. Got an 06' chev 2500HD 8.1L, its intermittent issue, some times when it kicks down or when power is demanded, it kicks down but then near dies... loses power I have to back out of it and baby throttle it back to speed.  If I'm on cruise control it will kick the cruise out as well.  No codes!!  Other times it's perfectly fine you can floor it and it kicks down and goes.  I'm thinking ECM?  Or BCM?  It has a new fuel pump in it.  Because it doesn't do it all the time I'm thinking electronic issue!?  

Thanks!

 

First thing that comes to mind is the fuel pump.  New ones can go bad too.  Was it GM OE or AC Delco?  

 

Hook it up to a scan tool and watch the fuel pressure when you whomp on it.

Posted

This is just a guess. 

 

Possibly an intermittent issue with the throttle body / throttle position sensor? If the TPS info is not matching the actual throttle plate position - it would cause significant problems, and may not throw a code. You can use testers to monitor the TPS info, then watch the throttle plate to see if it matches.

 

 

  • 1 month later...
Posted

So turned out all it was is a bad MASS!!  It didnt throw any codes... I recently cleaned it... but it was bad.  Replaced it....whalla...ready to race!   Lol. Friggin MASS...give you more grief than there worth!

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