Engine miss

[Mopar1970man]

I have 1999 cumins 4x4 automatic that has recently had vp44 replacement and while driving it seems to miss it mostly does this not under a load like when going down hill it doesn't do it while accelerating. It has two new batteries. I am not getting any codes no check engine light and I have no clue what to look for on a diesel. 

[Mopar1973Man]

Welcome... Err um... Mopar Man... 

 

I would start out testing the alternator for excessive AC noise. 

[Hawkez]

Any idea on what your fuel pressure coming from your Lift Pump is?  Your fuel filter may need to be changed.  What mods have you done to your truck?  Why did the IP get changed?  Was this miss happening before the swap?

[Mopar1970man]

It was happening sometimes before IP swap. Changed IP because it was smoking and had no power changed lift pump when I changed IP. It is also hard to start I have to cycle key a few times before it will start it idles and has plenty of power. There are no mods on engine. 

[Dieselfuture]

I would suspect injectors 

[Mopar1973Man]

33 minutes ago, Dieselfuture said:

I would suspect injectors 

 

Possible... Typically I noticed the miss more so during idling state. 

 

 

[Mopar1970man]

2 hours ago, Mopar1970man said:

It was happening sometimes before IP swap. Changed IP because it was smoking and had no power changed lift pump when I changed IP. It is also hard to start I have to cycle key a few times before it will start it idles and has plenty of power. There are no mods on engine. 

 I don't know anything about fuel injectors. How do I check them? 

[Mopar1973Man]

Your injectors have to be removed from the engine and then taken to a shop to be pop tested. 

 

[dripley]

4 hours ago, Mopar1970man said:

It was happening sometimes before IP swap. Changed IP because it was smoking and had no power changed lift pump when I changed IP. It is also hard to start I have to cycle key a few times before it will start it idles and has plenty of power. There are no mods on engine. 

By cycling the key do you mean turning the engine over a few times before it starts or you have to turn the key a few times before the starter will turn the engine over? If the engine is turning over but not starting you are possibly getting air into the fuel system.

 

This Mopar Man thing could get interesting.

Edited June 20, 2017 by dripley

[Mopar1970man]

I have to turn engine over a couple times before it starts

[Mopar1973Man]

Now that is a loss of prime problem. I've got to ask does the Wait To Start light come on instantly or does it delay?

[Mopar1970man]

The wts comes on for a couple of seconds. Truck had been sitting up for 3 years before I got it from a relative. I recently had the IP changed and lift pump. I had read on a site that it may be the copper crush washers does anyone have any ideas on that? The truck seems like the fuel shuts off while driving the rpms will drop 300-400 and come right back up.  

[JAG1]

Clogged filter bad fuel from a long storage? Change filter also Is there any chance there is a filter before the lift pump. I'm hoping  Otherwise clogged tank screens?

[Mopar1970man]

I've changed filter I'll check tank

[Killer223]

algae in the fuel. it'll keep clogging new filters.

or you have an intermittent lost of lift pump pressure. check grounds, and lift pump flow.

[Mopar1973Man]

2 hours ago, Mopar1970man said:

The wts comes on for a couple of seconds.

 

You missed what I was looking for. When you turn the key on does the Wait To Start come on the very instant the key click to the ON position or is there a small delay (maybe a few seconds) before it lights up then go out?

[Dieselfuture]

Still need to know your fuel pressure, even new lift pump can be junk. And I agree on loosing prime, air is gettingin somewhere in fuel for it to start hard. If you're planning on keeping the truck I suggest to put a good lift pump like fass and basic gauges, fuel pressure, egt, tranny temp if an auto to begun with. On the injectors if you're going to take them out, just get some rv275  and call it a day until you figure out where to go next with your truck. RVs can always be a back up injectors if you ever go bigger. Definitely check for AC current on the alternator output,  causes alot of problems. 

[Mopar1970man]

I had injectors rebuilt that has seemed to fix the surging of the engine. My apps is at 8.6% at idle I'm gonna try to reset because it's hard to stay at slower speeds. I'm still having hard starts but if I turn key on and off until wts comes on it starts fine. I'll be inspecting fuel lines for air leaking in at connections. I'll keep y'all updated. I will also be adding fuel pressure gauge and trans temp gauge. Thanks for all the help

Edited June 23, 2017 by Mopar1970man

[notlimah]

That's an issue. You shouldn't need to keep turning the key on and off until you see the WTS light then start the truck. It should illuminate as soon as you turn the key to ON the first time.

[Mopar1970man]

Truck runs perfect now. This is what I had to do, injectors rebuilt and reset apps. Thank everyone for helping me out