P7100 Problem?

[Huntmastr1]

Would you guys accept a question from a properly valved brother?

I have a friend with a 94 12 valve Auto, who ran some bad fuel through his pump. After cleaning up the system he wound up with a rough idle.

He had his local dealership check it out and they say that the #4 plunger in the injector pump is not doing something properly and he must replace the pump.

My question is: can the pump/plunger be repaired or is replacement the way to go?

2nd ?: Can he replace the pump with a stock later model pump and gain any performance?



Thanks in advance

 

[Boldt's Wagon]

First check out the injectors. Loosen the fuel line for each injector in turn while at an idle to confirm that cylinder number 4 is the offending one. Then trade the number 4 injector with a good one from another cylinder (number 3?). Then repeat the idle test while loosening fuel lines. If number 4 is still the bad one then the pump is bad. If the bad cylinder is where you moved the number 4 injector, then the injector is bad.

 

[Huntmastr1]

The injector test has alraedy been done!

Loosening all the delivery lines showed that fuel delivery at #4 was virtually none existent.



Looks like he is going to need a pump!



Thanks all,



Jeff

 

[JIM S.]

to answer your question about a pump from a diff year... have him get a 215 hp pump (96-98. 5 5-speed) that will give him lots more room to "grow"

Jim

 

[Huntmastr1]

Originally posted by JIM S.

to answer your question about a pump from a diff year... have him get a 215 hp pump (96-98. 5 5-speed) that will give him lots more room to "grow"

Jim

That is definately what I would do



Jeff

 

[JGK]

But to answer Huntmastr1's original question: can the plunger/barrel be repaired? I would say the answer is yes, correct? And it would be the cheapest (but not cheap) fix.



-Jay

 

[Cummins Corvette]

The plunger/barrel is replaceable, but they cost almost $300 each. You would also have to pay for the teardown and reassembly of the pump and get it recalibrated. I would guess that it would cost almost as much as a new pump.