Intermittant stall, power loss, engine check light

[mental69]

My 99 cruiser has suddenly developed an intermittant problem. I'll be driving along and I'll apply the brake to slow down at an intersection or make a turn, and occasionally, I will push the accelerator and the truck will only creep along at around 12-1400 rpm (5mph or so) and the check engine light comes on. Its as if the fuel pump has stopped working beyind providing enough to idle.

If I turn the truck off and start it again, it runs fine, and eventually a day or so later the check engine light resets. however, today it happened about 3 times, and I'm pretty concerned. When I'm sitting in neutral, I hit the gas pedal and nothing happens when I push it unless I totally jam it to the floor. But then I restart and everything is fine but the engine light. Before i take it in, I thought i would see if there were some ideas out there.

i was thinking clogged fuel filter, but seems unlikely. Seems to be more of an electrical or computer issue since it resets. Resister on fuel pump, or bad fuel pump? oxygen sensor? the truck probably knows exactly whats going on if I could hook it up to a computer.

I have about 168k on it, and have never had a major problem except replacing the starter ( not a fun job).

Appreciate any input.

Casey
Denver, CO

 

[1loudLX]

APPS is my guess....hey that rhymed!

 

[mcalvarez73]

i had the same problem on my '98 before, i changed the APPS... problem solved!!!

 

[mental69]

What is APPS?

 

[mental69]

Accelerator Pdal Position Sensor? never heard of such a thing, but I will now look into it.

 

[Trunk Monkey]

What is APPS?

https://forum.ih8mud.com/search.php?searchid=5530670

Search is your friend, a whole damn bunch of knowledge on the APPS.

 

[mental69]

I love this forum as much as my cruizer! Thanks!

 

[NMuzj100]

Search is your friend, a plethora of knowledge on the APPS.

I think this is closer to your intended meaning.

Try the FAQ too ...

Throttle Position Sensor / Accelerator Pedal Position Sensor problems (low power etc)

 

[pete100]

my guess is that the ECU is detecting a fault, and so does 2 things. firstly light the 'check engine' lamp on the dash. and secondly it limits the engine power to just allow you to limp home.
in any case, the fail code will tell you the source of the problem. either short the contacts and count the blinks (covered elsewhere on this forum), or get a dealer to plug in his reader.

 

[Trunk Monkey]

I think this is closer to your intended meaning.

Dammit. That's what monkey's get for trying to impress with big words.

 

[ddnuts]

Mental69, what's the situation at this point. I'm having the same symptoms as you describe. I'd like to know what you found out or what you did to fix the issue.

 

[farinvail]

Without plugging in the ODBII scanner it is all just a guess. Know the code, know the problem.

 

[erase]

Similar issue w/o dtc codes.

'99 100 with idle issues @ low speed. The issues continues to happen. Checked alternator thinkin voltage regulator. No DTC codes occur...ever. Ideas?

 

[NMuzj100]

'99 100 with idle issues @ low speed. The issues continues to happen. Checked alternator thinking voltage regulator. No DTC codes occur...ever. Ideas?

Have you tried cleaning the throttle body ? instructions in the FAQ.