Slight hesitation when cold

[Ironforger]

02 3500 5.9 ho Quad cab 6 speed 227k

 

Ok, a couple of times recently I noticed a slight hesitation while attempting to accelerate.  Happens when rpms are just above idle while I'm trying to accelerate from 2nd gear to 3rd gear.  Feels kind of like a dead pedal but not completely. 

 

Points to ponder:

 

- Issue seems to happen only if the truck is cold and I don't give it a chance to properly warm up

- Seems fine once truck is warm.

- it's not mis-firing or sputtering, more like the pedal is momentarily not completely responding.

- I am NOT getting any cel or codes associated with this. 

- 2 weeks ago installed the timbo apps and calibrated it properly.  (I had an intermittent dead pedal and codes 1693  &  0121.  I don't recall today's issues happening before I changed the apps. Also, today's issue is not a profound actual dead pedal like the 0121 is. I cleared the 0121 after installing the timbo apps. Issue has not re-occurred.

 

Wondering if today's issue is due to the ecu deliberately reducing fuel in relation to low engine temp and intake air temp?  If my issue as described is normal expected behavior because I'm not letting the truck warm up before going, then would the mopar1973man high idle kit help me?

 

 

Thanks!. 

 

 

Edited August 14, 2018 by Ironforger
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[Mopar1973Man]

Check for AC noise issues from the alternator? Being that the ECM uses the tach signal for different things and if the alternator is polluting the tach signal with alternator AC noise it can impact the performance of the truck.

 

20 hours ago, Ironforger said:

Wondering if today's issue is due to the ecu deliberately reducing fuel in relation to low engine temp and intake air temp?

Doesn't happen. Now if your running a Quadzilla tuner yes this would be true stock ECM no. There are no real fuel limits on a Stock ECM for warm up. Remember I see temps down to -20*F for winter it still runs strong even on a cold start. 

 

 

[Ironforger]

26 minutes ago, Mopar1973Man said:

Check for AC noise issues from the alternator? Being that the ECM uses the tach signal for different things and if the alternator is polluting the tach signal with alternator AC noise it can impact the performance of the truck.

Thanks Mopar1973man!  What are the steps / method for checking for AC noise from the alternator? I have a fairly good klein tool multimeter if necessary.

 

I think I found Mopar1973man's video which explains how to test for AC noise:

 

 

Edited August 15, 2018 by Ironforger