Engine/Transmission (1998.5 - 2002) Mach 2.5 EDM's installed but...

[PRyker]

I have a few questions about how my truck is running now...



The install went easy and truck started up after about 10 seconds. I was really happy as I did not think it would go so smooth. It ran just a bit rough but figured it would clear up after a few days. Here are some of the small things I have noticed and wondered if others could comment on them:



1. Smoles bluish smoke now when starting up in the morning. CLears up after I drive it. Does it at idle only really but it is very noticable.



2. Reving engine while in park the engine will miss a bit, but only if I really step on it. Under load no miss at all. I can here it miss when I am going down a hill though and the engine is breaking the forward momentum of the truck.



3. I hear a loud clicking / tapping sound coming from the drivers side of the engine. It speeds up and slows down with the speed of the motor. Sounds like it is coming from the VP-44 but it is hard to tell. Will bigger injectors change the sound of the injection pump? Almost sounds like loud valve tap?



These things did not bother me at first as I figured they would go away after a while. They haven't and I would like to hear from others. I did torque the hold down bolts to 89 inch pounds and was careful when pulling out crossover tubes.



Thanks



Phil

 

[bmoeller]

How is the fuel pressure?



The 370's in my '97 smoke a lot too, when cold.

 

[Jetpilot]

Phil,



I run the 2. 5's and love them..... The smoke may be caused by the unusually cold weather we are having right now. As for the noise and the miss I am not sure what might be the cause. How long have you had the modified ecm, maybe it could be part of the problem. I am sure a call to Don M~ about will help clear anything up. He is very good at customer service and can probably help you out.



Doug

 

[Rman]

I've got mach 2's, I smoke quite a bit more initially at start up then I used too. The blue smoke is normal when cold. If you're doing that after getting off the freeway at idle you may have a bit of a problem. My truck "changed" sounds after injectors too, I just got used to it. My wife commented that she thought something was wrong with it, I just let it go... she doesn't know about the "improvements" I made.

 

[PRyker]

Guys,



I think my truck is ok and the injectors are fine... I believe the sound is simply a result in the change of the injection coupled with the Mad ECM. I have a constant 15 PSI of fuel pressure as I have a FASS. I have had the Mad ecm in for a few months before I swaped injectors.



The miss kinda bothers me but it maybe cause they simply have not settled in yet? It is only present when no load is on the engine like when revving up (which I avoid at all costs anyway) and engine breaking when going downhill. If it continues more than a few weeks I will give DonM a call. I am not worried though as DonM has AWESOME customer support and stands behind everything he makes.



I have seen others post similar threads after swapping out their injectors. How have you guys made out?



Thanks



Phil

 

[PRyker]

OH,



and is has been cold here so I will wait and see how much they smoke when it warms up. I will say that it may take a while as there is supposedly a big winter event on it's way here to the east coast.



The bluish smoke does not bother me as long as it does not mean anything is broken, worn, wearing or not working properly.



Thanks



Phil

 

[Vaughn MacKenzie]

I wonder if you seated all the injector tubes properly. After I've popped in the injector I try to align the groove in the head with the angle of the injector tube as close as I can then torque down the retaining bolt. Then put in the tube and make sure you snap it in place then torque down the injector line to 28 ft/lbs (getting this right is pretty important according to Cummins). Another way I do it is pop the tube in before torquing down the inj. retaining bolt and then I go back and forth between that and the injector line as I tighten down to make sure they're mating together well.



Vaughn

 

[cArNiVaLwOrKeR]

Missing?

@ 1800-1950 I geta missing/stutter noise too

But BobWagner said it may clear up w/MaD Ecm,

Ill get the Ecm later this year like July after I chrome out my Harley

 

[RHARVEY]

Is it a true miss or a lope???? Couple of years ago I heard HeberRam's truck idle and it sounded like a high lift cam.

It may just be a lope caused by the injectors. . If the truck pulls hard and smoothes out off idle . . I dont think you have anything to worry about. .



Rick

 

[PRyker]

When I installed my injectors I was careful to pry the tubes out about a 1/4 inch then pulled the old injectord and put the new ones in. Before I tightened down the injector hold downs I went back to each injector cross over tube and pushed on it with my finger and it would "pop" back into place. I then torqued the injector hold down bolts to 89 inch pounds and then tightened up the injector tube nuts into the head.



28 ft lbs for the injector line nuts??? I did not know I needed to torque these in properly. How critical is this? How in the heck would you torque a bolt that youy cannot get a socket on anyways? I have never done that.



OK, so what the heck is a LOPE? can someone explain a lope to me in a bit more detail??



Thanks



Phil

 

[RHARVEY]

It sounds like a gas motor in a hotrod. .



Rick

 

[PRyker]

Rick,



Hmmm... . It does kinda sound and feel like that. I am probably worried way to much here but it is just how I am. My wife had a 2002 Chevy Suburban with a 6. 0 litre engine in it with about 9000 miles and I could hear the dreaded piston slap. Even though I knew the truck was fine and drove great it drove me freakin nuts that something was not working the way it was really designed to work and I sold the suburban because of it. Well, I guess GM designed it that way but it bothered me a lot. I will never own one of them new GM engines until they get rid of the piston slap problems.



Everyone called me nuts but I simply could not get over it.



Now, I am not anywhere near that with the cummins as the motor is leaps and bounds better than that 6. 0 GM gasser but I just have to get myself "feeling ok" with the new sound.



Thanks



Phil

 

[Tcolesanti]

Hey Carninalworker, how long have you had your injectors installed??? It took a while for my 1. 5's to smooth out, about 3500 miles.

 

[justinp20012500]

Snap on makes a torque wrench that has a swivel on the head. Along with the use of a 19mm crows foot you can get to 5 and 6 fairly easy.



28lbs/ft is very important, but after you do say... . 5 or 6 sets of injectors it is very hard to get the line to seal to the connector tube, you have to start up'ping the torque to keep them from leaking.





Justin-

 

[DLBurns]

My 1. 5's never even made the engine stutter... Keyed the ignition and let the FASS run then cranked for about 5 seconds and it fired right up!!

This is a letter I got from DonM when the truck stalled ONCE after I put in the injectors.



"The truck runs good with the 1. 5's but it did stall once coming to a stop, any idea's?"



"Yes, the stall can be from the pop pressure. Some weaker pumps that are worn internally will get this from time to time. The only way to fix it. is to drop the pop pressure below the stock level. Stock is 305. Most stock injector cores I get here are in the 280 range. They drop very fast, the ones from Bosch. I set them at 305 as a new injector would be, but sometimes it will cause me some grief. As the needle wears into the nozzle the pop will oftentimes lower some and the trouble will go away. "

 

[PRyker]

ok,



I am going to remove the injector line bolts, clean the connector tubes, reassemble with proper torque specs and then see what happens. I did a lot of reading on previous posts and I learned a lot.



If I still have the same issues then I will talk to Bob Wagner or Don and I am sure they will do right by me.



Thanks for all the help.



Phil