Isuzu Throttle Position Sensor Glitches

Isuzu Throttle Position Sensor Glitches

Posted in the Isuzu NPR Forum

Tim

Evergreen, CO

#1 Oct 11, 2006
At 30% throttle the angle drops out but voltage stays great!Ive checked a million of these trucks.Replaced trans controller,tps,idle switch, adjusted tps exactly like NPR manual recomends.
David

United States

#2 Oct 18, 2006
I have a 1996 NPR 3.9 diesel that does not seem to accelerate much beyond 30+MPH. The automatic transmission shifts properly and the exhaust brake is operating. I replaced the fuel filter and it improved slightly, but the problem is still present. Any ideas?
joe

Carnation, WA

#3 Mar 19, 2012
2004 NPR 6.0 gas no pedal response has new tps pedal and module comes and goes mostly goes any ideas
NPR gas peddle help

Holly Springs, NC

#4 Mar 20, 2012
joe wrote:
2004 NPR 6.0 gas no pedal response has new tps pedal and module comes and goes mostly goes any ideas
I am having that problem put iron the computer and the guy says the Throttle body Is bad I got one coming next day FedEx
joel

United States

#5 Mar 29, 2014
NPR gas peddle help wrote:
<quoted text>
I am having that problem put iron the computer and the guy says the Throttle body Is bad I got one coming next day FedEx

... I have the same problem did get to fix your truck?
joel

United States

#6 Mar 29, 2014
joel wrote:
<quoted text>
... I have the same problem did get to fix your truck?
mine only does it on humid weather . "Yes is so weird". Im on FL. so it's does it very often until the day dry out. Any help welcome.
Brennan

Spring, TX

#7 Oct 12, 2014
My isuzu npr has the same throttle issues we replaced throttle body , gas tank, gas pedal, and partial wiring harness. Will never buy a npr again only 120000 miles
JMG

Paterson, NJ

#8 Oct 13, 2014
I can't speak for all NPR model years but i had similar issues with my 1996 GMC W4500. What seemed like intermittent shifting/throttle issues were due to occasional loss of battery voltage. If you are having starting/charging problems or disconnect battery for any service work the throttle position must be relearned for proper shifting and throttle operation.
On my truck the relearn can be done as follows.
(1) Turn key to on position
(2) Depress throttle pedal fully
(3) Release pedal
(4) Start engine
Sounds too simple but it works! Of course this is only if there was a low system voltage condition which may have happened without operator realizing it.

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