Engine/Transmission (1998.5 - 2002) light throttle miss + P1693

[TboneMan]

I've done my searches but I want to confirm my suspicions.


First the specs:

2001 HO, 6 speed manual. 208,000 miles, orig VP44, fuel pressure with stock lift pump 8psi (this OEM pump has over 160,000 mile on it, and still holds).

I got stranded by the APPS in December and hit has been replaced.

Symptoms:

Occasional slight "miss" or stumble under light throttle. Through a p1693 code and a p0252 yesterday on the way home.

Check engine light reset itself this morning. Codes still showing upon inspection


I know I'm on borrowed time for both my VP44 and lift pump (I already have a new lift pump sitting on a self in the garage).

Based on what I've read, it looks like the VP44 is about to die.

Is this a fair assumption or should I look for other (cheaper to repair) causes?

 

[tntframing]

here is what i was told by the rebuilder of injection pumps here in my town. (yes a bosch authorized shop) The vp44 sometimes when going out will not cause a code from the ecm or pcm. Because the electrical values according to the pcm and ecm are still within specs. so you get no code, as mine did. But what i did not know is the vp44 will have and store its own codes which could show if your pump is going out. Mine had death codes stored in the pump electronics but never showed up in the ecm or pcm. So what im trying to say is take your truck to and injection pump rebuild shop abd ask the to check the pump. Its no fun to guess, change parts and find out you wasted your hard earned money just to have the same problem.

 

[JLandry]

Based on what I've read, it looks like the VP44 is about to die.



Is this a fair assumption or should I look for other (cheaper to repair) causes?

Lacking additional information to help pinpoint why the check engine light came on, it seems like a fair assumption to me. But keep in mind it's hard to predict if the VP44 will suddenly "die. " Sometimes when they wear out they start exhibiting bad behaviors such as you described, but otherwise can continue to operate for a long time... or not.



John L.