Archived Truck is missing need help

[RodeoSI]

I am a brand new member. Thanks Mr. Wagner for getting me started. The forum has been great reading and now I am a member, just in time.



My truck started missing yesterday just at low idle and only after it had gotten hot. Tonight I put in new injectors, DD2. An off duty cummings mechanic did. He thought the lift pump was going. Just from the sound it was making as we were pruging the system. The miss does'nt happen right at start up and it had gone away, I thought, after I filled up with fuel today. However after the injectors and warm up it is really stumbling now. And I can notice it is happen all the way through power up.

I have an EZ, DD2, AFE intake and exhaust and very little smoke. My pyro seems to be normal 600, no load, post turbo, 5th gear 2100 rpm.



What should I do now. MY lift pump and injection pump are still under warranty. Replaced 8000 miles ago second set in less than 20,000 miles.



Thanks

 

[lmills]

Have you checked your fuel pressure or for codes?

 

[RodeoSI]

no I haven't. Do I have to have someone check those for me?

 

[rkressg]

If you plan on having any warranty work done to your truck, REMOVE any of the mods (such as the ez and injectors) or the dealer will void the warranty!

-Rich

 

[RodeoSI]

Ok! Dealer replaced the lift pump and the injection pump. Still has a miss. Don't know where to go from here. The lift pump was putting out 4 ounces per something when it was suppose to be at 45 ounces per. The injection pump did not set any codes but I persuaded them to swap it any way based on symptoms. (They were not real happy when the symptoms did not go away. )



I did remove my ez box. Thanks. Any suggestions?

 

[rkressg]

Did this miss start with the new injectors, or was it present before the swap?

I am not sure, but it could be a problem with possibly a bad crank, cam, or apps sensor.

BTW, have you tried to change your fuel filter? I remember at my old job, if any motor began to act up, the first thing we did was change the fuel filters. It fixed the majority of the problems.



If you can, can you give more details as to when the miss occurs?

I. E. motor temp, weather,

-Rich

 

[RodeoSI]

Thanks.



The problem started before the injectors were replaced. I did change the fuel filter, hoping that would help it didn't.



Today, I changed the oil, disconnected the batteries and cleaned and retighten all my ground. (I read the problems with ground connection last not on TDR)



The miss happen only at idle and becomes more noticeable as the truck get warm. It doesn't seem to have any problems in the higher rpms. It acts as if its about to die but it catches itself. When I drive and come up to a stop light and push in the clutch, the rpms stumbles as it comes close to idle.



At idle if I step on the fuel pedel quickly, it reves up and stumble on the way back down. If I do this a couple of times, the truck starts to stumble at idle. The best way to describe the stumble is it acts like its going to die and the comes back. When it is not stumbling, you can hear a real rough idle. Almost like it has air in it.

 

[RodeoSI]

Here is more information.



It starts pefect. First try. When it first starts it doesn't run rough. It only starts if I rev the motor or after I take off and come back to idle.



On start up, on rev or driving, I am not getting any white or blue smoke. If I rev the motor it will do a small puff of black smoke at first. I can get it to blow black smoke when I am driving. The truck does not smoke on the rough idle.



A few times when I start off the truck stumbles like, a gas motor does when you start in to high of a gear.



Other than that the truck seems to run good. I had a small load on it today. My egts are good, my boost is good, my engine temp is good. Power seems good.



I had two thoughts: Could valves being out of adjustment cause this? Or Maybe somehow somewhere I am sucking air and more so after the motor is warm or after I have been pushing on the fuel pedel.

 

[DieselMinded]

WOW THIS IS A TUFFY



Looks like you've covered just about all the bases... ... ... .

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Sounds like its not sure how much fuel to tell the pump to pump when engine is at an idle-------DOES Fuel Pressure drop when motor starts acting like its dieing???

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Could also be batteries going south even tho there clean its sounds as if when the block heaters cycle it boggs the motor down to the point to where it about dies then when they stop the motor revs back up. When your operating the alternator must be pulling the load or the block is alreay warm so the heaters dont kick on.

-----------------------------

Thats it Im ALL out



Just some guess's

good luck

DM

 

[rkressg]

How many miles are on your truck. With regard to your question about valve lash, unless something happens, even at 125,000, the valves are usually not that far out of spec. I believe that the specs are 17 thou and 7 thou on the exhaust and intake respectively, but I can not remember.



I do have a question, is there any abrasion on any of the engine harness wires? Pins 13, 23 on ECM go to 1,2 on the PECM (injector pump). These wires are shielded and twisted together. If they come unwound, electrical inteference could possibly cause some type of problem, maybe even a possible timing issue.

 

[RodeoSI]

In regards to the fuel pressure dropping, I have not installed a fuel pressure gauge. (Yet) Seeing this is my third lift pump, I plan on getting a gauge and an aftermarket pump to help the lift.



I will test the batteries. Thanks!



The truck only has 97,000 on it. But the motor is less. Before I bought it Dodge replaced the motor because the block cracked. (After reading on the site maybe it was one of the 53 blocks)



I looked at the wire harness but not real close. I will go back and look again. And find the twisted pair to make sure they are still in good shape.



Thanks again! Headed to Arizona!

 

[DieselMinded]

WITH THAT MUCH FUEL SYSTEM TROUBLE IT WOULD BE WISE TO GET A Fp GAUGE



AND if I was you I get a FASS and put a stop to the lift pump worries.



Good Luck

DM

 

[Mad Bomber]

It would also help to have your truck profile. Sometimes the NEW LP's are bad from the begining. I've got a gauge if your anywhere some what close. Where do you live?

 

[RodeoSI]

Sorry about the profile I am still learning. I am not sure how to put it up but I will give it here until I am to put on my profile.



Had to turn around on my way to Phoenix. Fully loaded. Ran ok but was getting worse. Back home Calhan, Colorado



Truck profile

99 w/cowboy conversion. 5spd, EZ, DD2, AFE intake (stg 1) and AFE 4inch exhaust. E Brake, pyro & boost guages.

 

[matches]

Hey cowboy, check all your fuel lines from your tank/tanks to the injector pump, a cracked or pinched line could be causing your problems. As far as getting worse with the new injectors, they need more fuel and you allready have a fuel delivery problem, thus problem worse. Buy the fuel pressure guage! I've read other members with similar problems that have found either cracked or pinched fuel lines between the tank and injector pump, I hope this helps any.

 

[Mad Bomber]

Just a thought my pick up screen in the tank was dirty after that many years could it be trying to suck dirty stuff out of the tank? That screen is REAL REAL Fine.

 

[wcjp]

Do the 24v have the dryrot issues with the supply/return lines like the 12v's? If so, my 12v also had a bad soft fuel line at the liftpump.

 

[Mad Bomber]

Do the 24v have the dryrot issues with the supply/return lines like the 12v's? If so, my 12v also had a bad soft fuel line at the liftpump.

Good ?? don't know?

 

[RodeoSI]

Here is what I know today! And I am afraid to say it is less than yesterday.



(I am going to check all fuel lines Tuesday)



Could the PCM cause this type of Problem? Because today at 4 Wheeler Unlimited in Denver, we had the scanner set up on the truck and the PCM continued to give different types of readings. 1st the intake temp would never move off of 90 F then later it worked. One time it read at idle that the truck was under a load 16% - 20%. Then it set 1693 code a bunch of times without setting an ECM code. This finally went away after we disconnected the batteries to erase the memory. Then lastly the idle on and off switch was not working accurately. You could run the idle up to 15000 rpms sometimes before the idle off would come on. (NONE OF WHAT I JUST WROTE MAKE SENSE TO ME BUT THERE IT IS)



I had an ECM update on 7/22/04 but did not get an PCM update. Last update was an AC (don't know what that means) (My board is a AB with an AC update. I was told that there is an AD with an AE update) (again all foreign to me)



They did not think it was a fueling issue because of the power that I have. Still seems to me because I drive alot that there is a variation in power from one time to the next and even through out the power curve.



This doesn't seem to make sense to everyone that has looked at it. Let me know if anyone needs more info or if anyone has any ideas.



I will be working on the fuel lines! And checking the sending unit and the sock.



Thanks

 

[DieselMinded]

""I had an ECM update on 7/22/04 but did not get an PCM update. Last update was an AC My board is a AB with an AC update. I was told that there is an AD with an AE update""

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WOW... ... ... ... ... ... ... ... . Im lost now



Replace the ECM it sounds screwy even with the updates. Things should'nt be jumping all over the place unless its messed up. Im sure its not a number of other things all going bad at the same time ..... unless your batteries are bad or you have a bad ground causeing the ECM to hick-up. ???



GOOOOOOD LUCK!!!!

DM