I went to fuel up tonight, finished up and payed. Then I went to start the ol' beast and it idled very rough, then would only turn over. No CEL, only the 1693 that I can't seem to run away from (will be checking that out tomorrow), I cracked 1, 3, 4 injectors, got plenty of fuel, bumped the ignition a bunch of times before i cracked the lines, and then twice after i cracked them, tightened them back up, and started up right away with a rough idle, then after revving it a bit, drove perfect. Got home, let it cool down, shut it off, then started it back up with no problem...what the h*ll??? VP problem??? I'm about to drive this truck off a cliff...good news is that this problem happened right after coming home from the dealer...I was looking at a 98 QC 12v 5sp...maybe its a sign. Any info or ideas of what happened would be very helpful.
A big thanks to all who read this

 

Looking at your sig, sounds like you have a pretty sweet truck!

The pusher and Carter aux pumps should be keeping the HRVP "happy", have you seen any indications of low FP? I'm not sure if the HR requires more pressure/flow.....Having plenty of fuel at the injectors is a good sign that you're srill pumping fine from the VP.

Hopefully you just had a gremlin hidden amongst all the goodies you have on your rig, and the Cummins finally spit it out, never to be seen again -

 

Rauschbo, thanks for the nice words
ya I hope you're right! I looked into the 1693 code that I got and it turns out that the map sensor voltage is too low...I would imagine that the engine got flooded or something? I'm not 100% sure what the map sensor does. I'll do a search

 

ah, so the map sensor low voltage is not too big a deal from what I got from my search...hopefully nothing goes wrong anymore...

 

I am sure you checked for codes, so if you did not get any and fp was good, look for a fuel leak, and it might pay to dump the water seperator.

 

ya, i mentioned that I got the 1693 code, which turned out to be a map sensor low voltage code in the ecm. so I think I will fiddle around with that connection on the weekend...hopefully that will work.
thanks all for your help!

 

same thing happened again today, except it would start once, after bumping the starter several times, and then idle very rough and just sputter until it died (all within about 15-20 seconds). I was running low on fuel, so I went and got a jerry can full of diesel, and put it in, hoping that that was the reason, but when I got it to start again, using the same method of bumping the starter, it ran rough as h*ll, puked out a huge cloud of white smoke and then died. Things like this make me wonder why the heck i bought this truck

Would that be the Map sensor sending improper fueling information? I had it towed to my mechanic, so he has to use a scanner to pull the codes, all I got was the 1693 code again...maybe i should just buy an '03

 

I know it sounds off base, but what condition are your batteries/cables etc in? Low voltage on startup might be giving the pcm fits and dumping out a code not really associated with the problem.

Try cleaning up the battery connections, check the cables and if you can check the battery condition. Maybe you are just drawing them down too far on startup.

 

With all the mods you list, I would pull and clean the MAP sensor. What it does is read the manifold air pressure and send a voltage signal to the ECM that in turn tells the injection pump how much fuel charge to send. The MAP sensor is located down back on the driver's side of the intake plenum, just ahead of the IAT. While you are there, check the terminals on the MAP for white fuzz, clean them and use dielectric grease. If they get any corrosion the voltage will drop and kill your fueling rate.

 

FYI, Whenever I start my truck a few times in a row, without taking it out and running it for a while I end up with a low voltage situation and it sets a code for low voltage at the APPS, (accelerator peddle position sensor). If I run it and get the battery all charged up again than the code clears itself after about 3 cycles of the Key. My Batteries are good and It usually only happens in the winter when the wait to start light takes a long time to go out. Before you off load the truck you may want to check the batteries first. Just a thought.

 

Now its giving me a 1757 gov pressure not between 15-20psi...what is the governer pressure?

 

"17" codes relate to the transmission.
Sounds like the electronic in the valve body are giving you a code.

 

Sounds like you may have a grounding issue. Check all of the ground on the batteries going to chassie ground. A loose ground will cause all kind of strange problems. Including no start issues.

 

marvelous...ah well, time to buy a DTT/Goerends tranny...hopefully nothing else goes wrong. I think a pair of new batteries will probably go a long way as well.
Thanks to everyone for their help. hopefully this is all the trouble I will have for a while.
Ian

 

No, No, No. No tranny yet!!!! (unless your looking for a reason!!!) You really need to make sure you have good strong batteries. Try doing a slow battery charge overnight and clear all codes and start over. You live where it is cold and especially since you have been doing a lot of cranking it is quite likely that the battery voltage is low and so the computer is picking up low voltage on all the sensors and thinking it has a problem. The govenor sensor is in the trans and will control lockup "I think". If you haven't noticed any shifting problems or lock up problems than I would suspect the batteries first. 3 of my friends have had wierd codes this winter because of the cold and not running the trucks long enough to get a good charge on the batteries. It won't cost you any thing to try that. Remember, do one thing at a time. When you start cracking fuel lines etc. you can create new issues by letting more air into the system. Take a deep breath. It's probably something simple.