Engine/Transmission (1998.5 - 2002) "Limp" Mode

[s2Mumford]

OOPS!



Edited because I hadn't had enough coffee when I posted

 

[SEmerson]

It sound to me like you have a dead pedal or a bad vp44. Is the trans shifting from start out? If it only has one gear then it is in limp mode.

 

[s2Mumford]

It's shifting. Just takes a minute to get any speed up, has minimal power.



After jiggling around all my electrical connections yesterday, the condition hasn't returned in about a half dozen starts.



Like I said in one of my earlier posts, I thought it may be electrical. Bad ground / bad connection, something like that.

To come and go like that just makes no sense to me.



Thanks

Stu Mumford

 

[SEmerson]

When a vp goes out many times you get a dead pedal. My 01 will do this often. I have barely over idle pedal response. It will also shift late but this is only because the pedal is push down so far. If you turn it off and back on most of the time it will work again for awhile. Mine also does it mainly when it is cold. Also a 0216 is almost always a vp44 going out.



Does this sound like what you are seeing?

 

[WTBurke]

Stu



Perhaps it would help to obtain the factory service manuals for your CTD.



Manual #2 section 14-66 The Bosch VP-44 fuel injection pump is a solenoid-valve controlled-radial-piston-distributor type pump.



(skip to 3rd paragraph)... Fuel from the transfer (lift) pump enters the VP44 where it is pressurized and then distributed through high-pressure lines to the fuel injectors. The VP44 is cooled by the fuel that flows through it. A greater quantity of fuel is required for cooling the VP44 than what is necessary for engine operation. Because of this, approximately 70 percent of fuel entering the pump is returned to the fuel tank through the overflow valve and fuel return line.



I have been a member of TDR for a little while now. I have learned a great deal and I study outside sources to build my understanding. When a new person comes along I will try to help if they post to something I have experience with.



I work in high pressure fluid delivery systems for a career. I have H. O. P. E. for everyone I deal with. HOPE is an acronym for Help Other People Evolve. I teach and I also learn from many people.



Welcome to TDR... . there are some great people on this site



William

 

[SEmerson]

BTW

The return line is at the overflow valve right infront of the fuel supply line at the vp44. That line runs to a T by the map sensor where it picks up return from the injectors and then goes to the fuel tank.

 

[s2Mumford]

Man is my face red!





Thanks William, and my humble apologies.





I replaced the LP with a FASS system and now I see what you are talking about. The FASS adds a SECONDARY return line into the filler neck vent line, I didn't think through the whole deal.

I assumed that the return line was to replace a retun line rather than to install another one.



I guess I'm in that stage of grief ... denial?



Cheers

Stu Mumford





PS Live and learn.

 

[WTBurke]

Hey Stu

We are all here for each other and I know what your going through. Lets always work togather.



No Worrys



William

 

[s2Mumford]

Originally posted by SEmerson

When a vp goes out many times you get a dead pedal. My 01 will do this often. I have barely over idle pedal response. It will also shift late but this is only because the pedal is push down so far. If you turn it off and back on most of the time it will work again for awhile. Mine also does it mainly when it is cold. Also a 0216 is almost always a vp44 going out.



Does this sound like what you are seeing?

Exactly. Mine is also an 01.



I did creatre a sig, but for some reason it doesn't show up when I post?



Thanks

Stu Mumford

 

[SEmerson]

Mine has done that for over 40k. We have just put up with it. I do have a spare vp44 under the back seat but haven't changed it yet



Your sig works

the forums are set to only show it on your first post.



I live in Moreno valley btw

 

[s2Mumford]

Originally posted by SEmerson

Mine has done that for over 40k. We have just put up with it. I do have a spare vp44 under the back seat but haven't changed it yet

And the people said "Amen!!"



Thanks, neighbor.



I live in Woodcrest.

 

[Huff N Puff]

The 0216 & 1693 are

The 0216 is a problem in the VP44 usually caused by the fuel delivery system to the vp44. It could be the VP44 itself but it is more than likely the FASS that has not been installed properly,or it is not delivering enough fuel to operate the VP44 properly. Please call the folks at FASS and clearup how to install it. Please dont use scotch locks on the wiring,solder all connections. Please post how you installed it, we might see a problem. The 1693 is a problem in a companion module. Meaning the engine processor is seeing a problem in one of the other processors,eg VP44 module or trans module or body control module. If any of these processors sees a problem in another pocessor . This is a common trouble code that is set when someone bombs their truck. In your case its probably the engine processor seeing a issue with the VP44 processor caused by the 0216. Hope this is some help. Merv

 

[Ron Bissett]

Originally posted by s2Mumford

I hear ya!



I'm sorry, I thought I put all that stuff in my sig, I'll re-edit it right now.



The thing that I am having a hard time with is choking doown the cost of a new VP when mine is still kicking ass. I just pulled a ~6500lb package back and forth across teh Mojave Desert, up and over Chiriaco Summit, truck ran sweet on the way there, went boating, driving around town without the trailer went into limp mode, fixed itself, ran great all the way home. Averaged 14. 4 mpg, pulled strong.



I looked under the hood before I left for work, jiggled all the wires, and I think I may have sussed it.



The new harness that powers the FASS pump was sitting right on the starter.

I'm wondering if that was causing a short...



I'm going to keep hammering away until I'm left by the side of the road. Until then, I'm going to keep a rabbit's foor on my keychain and a six pack of sodas on ice in the bed



Thanks

Stu Mumford

Have you changed the fuel filter? Some times a Load of fuel can be pumped in the station tank and you just pull in and before all the junk crud water and other stuff like rust dirt and bugs etc have settled back to the bottem of the tank you pump some in to your trucks tank ,the only thing standing in the way is your filter check it often and change every 11000 miles. You may still have this crud in the tank . Hope its not the pump but before puttin out all that money Id check the fuel system and the wire harness and any thing related . Ron Bissett in Metro Louisville KY.

 

[RHARVEY]

I have an 01 sitting in my driveway that has a p1693 code. I installed a fuel pressure gauge on the banjo that connects to the 44 and found that the truck has 2lbs of fuel pressure at idle. There is NO POWER at all. When you push the throttle down the truck barely moves. I did replace the lift pump and now the gauge shows 16lbs of pressure. I just want to make sure that its the VP-44 that has went bad before I order this guy another pump. Even with the new lift pump that truck still dont have any power. . and the only code is the P1693. .



Any suggestions???



Thanks

Rick