Romping and hard start - Ford Powerstroke Diesel Forum
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post #1 of 68 Old 04-11-2012, 03:21 PM Thread Starter
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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!
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post #2 of 68 Old 04-12-2012, 11:57 AM Thread Starter
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Anybody have any ideas?
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post #3 of 68 Old 04-13-2012, 03:12 PM
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do you know what tune you are running in?

2000 f550 crew cab 4x4 w/ utility bed
regulated return w/ bowl delete, 4" straight pipe, stage 1 single shots, DIY 6637, adrenaline HPOP, DP tuner F6= 80 econo, 140 aggressive, 140 extreme, towing tunes, 22.5's w/ super singles
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post #4 of 68 Old 04-14-2012, 12:21 PM Thread Starter
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I have a TS chip with 6 tunes it does it in every tune, ive tried beans and php tunes. It was so bad i took the tuner off my truck and it actually runs better. Still romps at idle though. I also replaced the pcm with no change.

Im thinking it has to be mechanical. Like i said i have the AE scanner but not sure what to look for.
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post #5 of 68 Old 04-14-2012, 02:40 PM
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This is just a wild guess because all of you're info from ae is similar to mine and my truck is running fine. Has the CPS ever been changed? I know the truck won't run if it goes out but I am unsure if there is an in between for a CPS failure. When was your last oil change and what type of oil are you running? Running some rev x might be an option??

2000 f550 crew cab 4x4 w/ utility bed
regulated return w/ bowl delete, 4" straight pipe, stage 1 single shots, DIY 6637, adrenaline HPOP, DP tuner F6= 80 econo, 140 aggressive, 140 extreme, towing tunes, 22.5's w/ super singles
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post #6 of 68 Old 04-14-2012, 04:39 PM
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Might want to verify the actual hpo pressure with a mechanical gauge.
Just because the ae is seeing correct pressure, doeant mean that it is the actual pressure.

Lee

2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
6637 with custom intake pipe. TS Performance 6 position chip!
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post #7 of 68 Old 04-14-2012, 04:56 PM Thread Starter
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CPS was changed about 15k ago.
How do i check HPOP with a mechanical gauge?

It only does it at idle. if i bring up rpm just a little bit it stops. Could it ba a bad oil pupmp not feeding my HPOP at idle? Also when i cold start it i can drive around the neighborhood slow andc its fine for about 5min but if i get on main road and get on the throttle a little harder it starts right away.

I dont remember what kind of oil is in it. I had it done at the shop when they put all these parts on.

I also have new ipr. The truck didnt do this before new parts were put on, but sat for 6mo before getting the work done.
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post #8 of 68 Old 04-14-2012, 05:14 PM
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What you have going on sounds similar to what you would get with the 10k mod on the icp.

Could the harness or sensor be messed up a little? Is there any oil in the sensor?

You would have to plumb a mechanical gauge in a hpop line. Im not sure on the procedure though.
what about unhooking the icp and driving it around a little to see if it is better.

Lee

2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
6637 with custom intake pipe. TS Performance 6 position chip!
[/URL]


Please don't confuse my attitude with my personality.. my personality is who I am,my attitude depends on who you are...
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post #9 of 68 Old 04-14-2012, 05:17 PM Thread Starter
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I just replaced the icp after it started acting up. I got to go to the store in a min anyways so ill try.

Could it be air in the fuel?
ow do i check oil pressure on on the motor (not HPOP)
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post #10 of 68 Old 04-14-2012, 05:22 PM
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Im not sure where the factory sensor is.
You can take the cover off of the hpop reservoir and see if it is about 1" from the top.

Lee

2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
6637 with custom intake pipe. TS Performance 6 position chip!
[/URL]


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