Fed Up....Bad Miss Continued

[Diesel Freak]

Has anyone thought about the possibility of a high RF field causing a problem..... when your truck acts up again, note your physical location, and take note if there is a high RF source near by. RF and electronics do not like eachother, and some times RF can tempotarily or permanently scramble Electronics... also, when you install an EZ or any other electronic device... MAKE SURE YOU ARE GROUNDED! ESD CAN AND WILL KILL AN ECM!

 

[GGades]

Mine rattled all the way from Minnesota to Idaho and back.

 

[STRALEY]

When I turn mt Comp off my truck runs great, no bucking and sounds good all the way up to 3200 RMP. But as soon as its on and I push the go pedal a fair amount, forgot it. Box or truck not sure, but we have a problem somewhere.



Jeremy

 

[GGades]

You got da same bug. Anybody tried a reflash on the Cummins ECM?

 

[EShaw]

I'm out of my league here guys but humor me if nothing else you can laugh and call me stupid.

What kind of air cleaner are you running?

Starving for air? Turbo cavatating? air getting into fuel?

When a computer gives you a problem or locks up we do a cold boot (restart)

What if you were to disconnect your batteries for ~3 hrs and see what you get.

Like I said you might just call me stupid but if you tried all the hi-tech pollyrazamataz some times it's the simple stupid stuff that cures the problem... ...

Eric

 

[Diesel Freak]

Originally posted by EShaw

Turbo cavatating?

Eric

Could you please explain how this can happen?

 

[EShaw]

Diesel Freak,

It would come from a disturbance/starvation of air flow.

http://www.dieselinjection.net/articles.html there is a lot of reading material there, but that was one cause of stumbling other than too much booze. LOL

How much time do you think it would take for the ECU/PCU to power down?

Eric

 

[Diesel Freak]

1. it is impossible to cavitate gases... cavitation requires a phase change..... liquid to gas and back again.



2. To completely power down and ECM may take at least overnight with the key on and the batteries disconnected... ... . it is hard to say but it really depends on how much capacitance is in the ECM and the rest of the vehicle.



3. I have read the Diesel Injection article before... ... . the guy is making some very large assumtions... ... but since the article is written so that the average person can understand it, I will let the assumtions stand.

 

[GGades]

BALLZ DEEP IN WHAT?

 

[outlawram]

Has anybody tried the TSB 18-02-99. It talkes about the TTC unlocking and locking when it should be consistantly locked. I sure hope we get this figured out. It is driving me crazy.

 

[Diesel Freak]

Originally posted by GGades

BALLZ DEEP IN WHAT?

hehe, if you do not know, you have more problems that a hickuping truck :-laf

 

[JPittman]

Outlawram,



I went to dealer for the shudder (?) (TC unlocking/locking) and asked about 18-02-99. It is not a "stand-alone" product anymore it is part of a complete software upgrade. Thought this was weird but others of authority have confirmed it. Anyway dealer did complete software upgrade. Did a short run up hills with the camper and it wasn't happening. Will find out this weekend on a long trip with the camper if it really is cured. Never noticed the problem empty.

 

[rubberneck]

I have had my ecm reflashed, no help. Could it be a bad ecm, possibly, bad wiring harness, possibly. Been wanting to swap ecm's with a "good" truck and see. need to find a victim i mean buddy to let me. if thats not it, i am going pull the wiring harness out and double check all pins are tight and put dielectric grease on them. others on this board have had vp44's replaced and it did not cure this. Just to be clear here we are not talking about torque convertor shake or slipping clutches, it is in the motor or should i say in something controlling the fueling to the motor. High frequency interfernce maybe, hmmm.

 

[outlawram]

Rubberneck,

That is exactly what the TSB 18-02-99 says. The locking unlocking is caused by. Electrical noise from TPS or alternator. What ever it is it shudders real fast. whether it is the torque convertor or not, nobody knows yet.

 

[rubberneck]

Ok, maybe i should have put my sig up, i thought i did that already, I have a manual truck and i have discussed my "miss" with others who have it also in great detail. obviously cant be the converter if i have a manual. Funny thing is i had a dealer tell me it was my torque convertor. (guess how long i stayed there) I think some of us are talking about 2 different problems. Mine is in the motor. as is others on this board maybe not all but there are several of us with this same problem. It is an intermitent bucking or shudder only under moderate throttle between certain rpms 1800--2200 give or take a few hundred seems to be the "spot" usually clears up under full throttle or very light throttle and is worse with cold weather or when a box that is advancing timing is added.

 

[outlawram]

that is the same rpm when mine does it. It feels just like running over a rumble strip before a stop sign. Mine clears up if I let off of the peddle or push it to the floor.

 

[Blackdog]

Rubberneck, I'm in total agreement with you b/c your truck is doin the exact same thing as mine and a buddy of mines and his a HO. Both of our cruise controls act up as well. It will speed up then slow down and so on. The dealer says the problem with the miss is in that cruise control module somehow. He's gettin it replaced this week, I'll let you guys know if it fixes his truck. Take care!

 

[Waterpete]

Stumble

This may or may not help but here goes:

I have a 99 4X4 with lots of extra power and I had stumble, call it engine momentarily quiting, when going at random speeds, since it was new.

I finally had it reflashed with two update programs last summer in Kenai, AK at the cost of $35. 00 per flash, as I was out of warranty. After parting with $70. 00 I didn't have a stumble but my mileage took an immediate drop of about 2 miles per gallon.

I guess the loss of mileage was better than the engine momentarily quiting while going down the road.

One other problem I have had was surging while going down the freeway at a steady speed. That turned out to be an intermittant connection at the MAP sensor. Dielectric grease fixed that.

Hoope this helps someone.

Pete

 

[GGades]

We all should be letting the munufacturers of the different boxes know of our troubles. I've talked to Diesel Dynamics, TST and Edge products about what's going on and none of them has really heard of an ongoing dilemma like this. If you are using a fueling box and having trouble, they need to hear it. All three companies were very perceptive and willing to listen and help.

 

[tmacc]

I don't believe it's the fueling boxes. I have had this stumble/hesitation for a year this month. The truck was stock. Nothing had been added at that point. It's there on stock trucks, just very hard to detect. It took me a little while to figure out that it wasn't the road surface. Feels like rumble strip as stated above. The fueling boxes certianly ascerbate the problem though.



I took it back to the dealer and they did the 18-024-00, which is a transmission reflash. Did nothing. Blaming the various box mfr. is looking in the wrong direction IHMO.



I have new symtoms that cropped up in the last day or so. The engine will miss on one cyl. for one rpm. It's happened just twice so far. The saga continues.



Some one mentioned dielectric grease. Is there problem of shorting between the two pins on the MAP sensor connector?



Blackdog,

Did replacing the parts you stated do any good?