Engine/Transmission (1998.5 - 2002) Intermittant Dead Pedal

[John - K5AWO]

Intermittant Dead Pedal.

Codes 0122, 0216, 1693
Codes used to clear out but won't now.

Changed out the APPS Monday with a used known good one. Did nothing to help. The trouble is still there with me. Started to do the recal of the APPS voltage but a used APPS complete with pedal assembly was handed to me for $150. 00 so thought why not? At least I get a test with a 2nd APPS. So, I now have a "known good spare?"

Trucks starts good like normal. Runs good except when the DP happens. When it happens, let off throttle, put auto-transmission in neutral and stab pedal a couple of times. Problem fixed, go on for a while until it decides to go DP again.

I have noticed that IF the truck is driven aggressively, and if, the pedal is kept busy that the DP does not happen. DP only happens when the pedal is held at a steady state condition for several minutes.

Also, when the temps are lower than about 45-50 degrees, DP never occurs. I drove for 5 months this past winter without ever having DP occur. The hotter the weather, the worse it is. temps now 100*F, DP is a very frequent event.

This has been going on now for a couple of years and is bugging the hell out of me. I just cannot believe that the VP can be bad and continue to function "normally" most of the time for two years.

So, is this still an issue with the APPS not being calibrated exactly as per the voltage on the APPS white tag? Or, as a second thread currently running suggests, is it a bad ECM? I have a 2nd stock ECM that is going to be swapped in this weekend. I just never thought the ECM might be the culprit, but will try that just to see.

a 3rd thought? Is low power consistent with worn injectors? My truck (98. 5 24V) has 107k miles, used to be a tow rig before I bought it at 87k miles 3 years ago. The truck is stock with a Van Akin module on it. It's a 1-ton dually automatic w/4. 11 gears and almost gutless.

4th thought. If someone convinces me that the VP has to be changed out, is it worth it to buy the HD version for the extra $700 bux?? Does this do anything that F1 injectors won't? Truck is box stock and can't afford a new transmission. I don't pull very often, maybe twice a year and drive easy (2100-2200 rpm) and watch out for overloading the transmission by shifting out of OD right away if it starts to pull down. I want more mpg, will the F1's do that?

Lots of questions here, but I really need to get this thing fixed because the truck needs to tow a 11,000# trailer from San Diego to Tulsa, OK in September and then double back to pick up the 8,000# Avion TT and take it to Tulsa.

The way it is now with the DP and almost no guts at all, it would be a very frustrating couple of trips. When we drive at night in cool temps, it goes all night without DP even once.

Thanks in advance for all of your good help.
John Craig,
Mesa, AZ

 

[16919]

Those are all VP codes. . it is dying, sorry to give the bad news. What HD pump are you referring to? Do you mean a HRVP? There is an SO, HO and a HRVP. As well as some kind of new monster pumps that nobody wants to say anything about. Bigger injectors vs a pump are two different things... . Based on your mods just get a stock replacement pump from I. I. , Blue Chip or Schied and then get a good after market fuel system and a good set of gauges to boot. Then you can start to think about injectors and transmission upgrades as well as a better exhaust, etc. and start down the slippery slope.....

 

[John - K5AWO]

I have ordered gauges and the Vulcan relocation kit and will move the new pump to the frame rail.

By HD pump, I was just thinking of the one that puts out more fuel, but from what you say it would make more sense to just get the stock pump and a set of injectors and save some money?

 

[SnoKing]

Look at Midwest Fuel Injection, they do not charge a core charge unless you fail the return the old pump in 30 days. Good price also. Rip can also get you a pump. Also certified shops will be using the same newer PSC and other pieces to remanufacture a pump. SNOKING

 

[azpete]

A couple of years ago I was coming home from the lake with the camper on and towing the boat. Started up a long steep grade with a passing lane and a Chevy with camper behind me, reached down to turn on the comp so as not to be embarassed on the grade and did not realize it was set to 5x5. Truck stumbled and just made it to the top. DEAD PEDDLE.



The rest of the summer I would get the dead peddle accellerating to merge on the interstate. Come winter the dead peddle almost gone but rough idle and smoke on morning starts.



Come spring and warm weather, dead peddle.



Called Bob Wagner and ordered a standard SO pump if I remember right was from Source Automotive for around $1100 with a warrenty. Been running fine for the last year and a half just fine. I think turning the comp on at that time fried the electronics in the pump.