bad injector vs. bad injection pump

[zman]

I had my truck into the dealer this morning because it has had a bad idle for a while and it seems to be getting worse lately. The mechanic said I had an intermittently bad cam sensor (which is on order), but he also said I had a bad #2 injector.



My question is can an injection pump problem look like a bad injector?



The reason I ask is because at 15,000 miles, I discovered that I had a dead lift pump - for who knows how long. The only reason I figured it out is that I installed a FP gauge and had very low pressure while cruising and NO pressure at WOT. I'm wondering if the bad lift pump killed the injection pump. I have had DD2's for about 6 months - so I need to check with Lawrence at DD Monday morning to get his input as well.



Your input is appreciated. TIA!



Steve

 

[HeberRam]

Bet money!!!!

I would bet money, its not the injectors... Did you have the lift pump replaced when you noticed the low pressure???? I have had two injection pump failures and both died instantly!!! Have you checked for water, changed fuel filter???? It is possible your injection pump is failing.



Don't let the dealer change your #2 injector, because he will put in factory replacement and things will get worst. DD injectors are extroned honed and balanced for each set.



keep us informed.

 

[LSMITH]

Steve, if you need a set of stock injectors for troubleshooting let me know. I think if the pump was bad you would get trouble on more than one cylinder, but I have been wrong before.

 

[zman]

lsmith - thanks for the offer, but I still have my stock injectors.



Any way to definitively tell which is the culprit without swapping injectors?



Steve

 

[LSMITH]

Swapping injectors will only cost you 2 new washers at around $2 each, and 30 minutes of your time to see if the problem moves. Injectors can have trouble, so it is a logical step in troubleshooting it. I can't think of any other way to tell without taking the injectors to an injection shop to have them checked out.