Truck misses like CRAZY when cold. What could it be??
12-07-2005, 05:46 PM
#1
Launching!
Thread Starter
Join Date: Jun 2003
Location: Kansas City
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
Truck misses like CRAZY when cold. What could it be?? Well... when I first start my 02 1500HD in the morning, or whenever it's below 20*, it stumbles and misses like MAD. The idle will drop down to about 500rpm and then jump back up to around 1200. It will do this back and forth till it warms up. Once it finally does warm up it seems to have a slight miss. But, once I get on the gas to take off from a stoplight it runs fine. I just changed the plugs and wires and am positive it's not that. Does anyone have an idea as to what it could be???
12-08-2005, 02:23 PM
#2
TECH Fanatic
iTrader: (9)
Join Date: May 2005
Location: Longview, TX
Posts: 1,085
Likes: 0
Received 0 Likes
on
0 Posts
I bet it's your intake gaskets. There is an updated part for them that will solve the problem. If you have a way to moniter your LTFT's watch them until it stops missing. If the LTFT's are around 25 and drop back down after it warms up I'de change the intake gaskets. If the LTFT's aren't around 20 or higher it's probably not the dgaskets causing this problem.
12-08-2005, 05:43 PM
#3
Launching!
Thread Starter
Join Date: Jun 2003
Location: Kansas City
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
I'll autotap it tonite. I scanned the SES light and it threw (4) P0174 "Lean fuel trim bank 2", (2) P0171 "Lean fuel trim bank 1", (1) P0300 "Engine misfire detected", and (1) P0300 "Engine misfire detected" in the Pending DTC's. I don't remember what the LTFT's were in the freeze frame. Thanks.
12-09-2005, 05:20 PM
#5
Launching!
Thread Starter
Join Date: Jun 2003
Location: Kansas City
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
Auto-tapped it this morning and it was showing 25 and NOT droping. Sounds like that's the problem. You don't happen to know what the updated part # is? If not, I'm sure the parts department could help me out. Thanks a TON.