Howdy, I've tried a few different forums and came up short so I'm hoping some new people could point me in the right direction.

I have a 99 Ram 2500 with the oh-so Eco-friendly 8 liter that I've brought to 3 different mechanics including a dealer. No codes in the computer but all agree she ain't right.

Issues: When I bought the truck two months ago on cold start up it would idle great for about 30 seconds and then act as though it was getting to much fuel so it would bog, backfire etc I till I snapped the throttle a few times then I can drive it for miles without issue. I changed the AIC and TPS sensor just to give it a go and still no luck. The issue is getting worse as now I can shut the truck off for ten minutes, restart it and then the bogging is there until I clean it out.

I had three different scanners on it and each one says no stored codes in the computer.

O2 sensors look new as well. Someone suggested bad injector, another said try a full tune up and another said possible vacuum leak (I sprayed starting fluid around whole intake and nothing)

Love the truck but I'm coming up on wits end here so if anyone had a similar experience I'd be happy to know the remedy.

 

Unplug the front O2 sensor(s), and see if its attitude doesn't change. Always remember: Just because it's new, doesn't mean it's right.

 

Were you able to see the adaptives on the scan tool to actually see what the fuel control is doing? You can narrow it down to a bank specific issue or a engine wide issue. Graph the O2 sensor wave forms if you have a fancy scanner.


Need to look at the coolant temp data as well as the MAP data to see if they match reality. Also pull the vacuum line off at the Purge valve and plug it off. I've seen some in the past suck gas up the line if the canister or another evap part is plugged. One more thing that comes to mind is the cam/crank difference in case the chain is stretched.

 

Unfortunately the shops I've been bringing the truck to aren't that advanced with their electronics, including the dealer. I've found another shop that is going to really dig deep and go through the truck circuit to circuit to see what the problem is.

 

The dealer does have that ability. I know because I have it here. Bad dealer, I guess. Many of them can't keep experienced techs, because they screw them. It's a shame really.