thek0rn

Hi all
im having a problem with my 98.5 24 valve. About 4 months ago, I installed a FASS150 pump with filters, and it runs great. But right around the same time, I began to have trouble with hot starting. It would crank for a few seconds before firing. It progressively got worst, along with some power loss and decrease in fuel milage. After just returning from bike week pulling a pop-up, (2,100 miles round trip), it wont restart hot. It also has a lot of trouble pulling out onto the highway. Seems like it pulls the same whether the pedal is ½ way down or all in.
I’ve read that the diaphragm in the vp44 is a common problem, as well as the electronics. I think its the pump, but havent done ANY testing yet. Does this sound like a IP problem to anyone else? I am going to test for fuel psi just to make sure the pump is working correctly. Any advice? Thanks in advance.

Mike Cornely
1998.5 24v 4x4 110K
MRBP 4" straight piped, S&B Intake, FASS150, ISSPRO EGT and boost gauges,
06' 17" rims, 285/70/17 BFG ATs

Snoking

Take it into an auto parts store and have them read your codes. If you have 216, the VP44 is going out. SNOKING

thek0rn

i have a modis (snap on scanner) and before the trip there were no codes at all. havent gotten a chance to scan it again, but im gonna check on that monday.
i also forgot to mention the high idle problem. after a few miles, with the engine warm, if i come to a light and stop, it idles at about 950 rpm, which is higher than normal. anyone ever experience this before??

Mike Cornely
1998.5 24v NV4500 4x4 110K
MRBP 4" straight piped, S&B Intake, FASS150, ISSPRO EGT and boost gauges,
06' 17" rims, 285/70/17 BFG ATs

dodgeguy71

What year was it that you could do the key on-off, on-off on thing? That will show codes, but not sure if that applied to the 98-99's. Anybody know for sure?

PaulDaisy

The FSM says that the stock lift pump operates at 50% duty sycle during starting in order to help with easier starting. I have read a lot of posts that say full pressure makes it hard to start on some but not all VPs. Perhaps this is what you have. What would I do about it? Well... can you adjust the pressure on FASS at all? If yes, I would take it down to like 7 or 5 psi and try. I would not WOT it at this, just run it gently, not taking the pressure below 3-5 on the road, and to see if hot starts are any easier. Maybe it is the high performance of FASS that is playing this trick on you.
-P

Snoking

I had hard starting last fall in the hot weather in the SW, then a week or two ago I had a dead peddle and another a week later. I have a 216 code set and have a VP44 on order. SNOKING

thek0rn

well i scanned the computer today at work, and the results are this: p1692, p1693, p0234, and p1389. i cant seem to get into the cummins computer with the snap on unit to check the p1692 and 1693 codes, but the p0234 is a overboost code. im gonna check the wastegate, and make sure everything is good on that end. i have a friend at the dealer that will let me borrow a drb and see whats up with the other 2 codes.

does the p0216 code set in the cummins computer or the mopar computer??

Mike Cornely
1998.5 24v NV4500 4x4 110K
MRBP 4" straight piped, S&B Intake, FASS150, ISSPRO EGT and boost gauges,
06' 17" rims, 285/70/17 BFG ATs

Snoking

Your 1389, No Auto Shutdown (ASD) Relay Output Voltage At PCM is interesting. SNOKING

thek0rn

i didnt quite get understand that one. correct me if im wrong, but as far as i know, asd relays are only used in gas trucks, and neither the relay or terminals are in the fuse panel. not sure why that one came up.