Join Date: Apr 2012
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Romping and hard start
I just bought a 2000 7.3, automatic, 4x4. I was told it has 200cc single shot injectors, aftermarket HPOP, 38r turbo, intake, exhaust, regulated fuel return, and DP tuner.
I have AE if anyone can tell me what to look for.
Heres my problem, the truck sometimes is a little hard to start and blows white smoke. It then idles okay and drive okay for a few min before it gets a rough idle. it runs good under throttle but as soon as i lift off the pedal it gets a choppy idle. The parts are low miles and all bought new. It does not always do this and will get worse if i get on the gas hard then let get off of it. I can make it stop for a few seconds if i have the tuner set higher than stock and turn it down while i give it a little gas. When i do this it get a really quiet idle then starts romping again.
Also sometimes its worse in park than in drive but not always.
I checked ICP pressure and duty cycle at idle and get between 460-500psi at 7-9% duty cycle. If i hammer on it under load it goes up to 3200+psi and 35-40% duty cycle.
I did a buzz test and i can hear them all pretty good(idk how loud the standard is)
I did a few cylinder contribution tests. First one came back good, after running around and doing other tests i did it again and it came back twice with cylinder 3 and 4 balance or something( i forgot how it was worded)
Ideas or things to test for would be great!