1st CEL, wierd symptoms, any ideas?

[CRUIZIN]

This has occured twice since yesterday.

The 1st time it happened was when I was accelerating from a stop in a parking lot to get onto the main roadway. The CEL light came on, and I did not have any throttle response. The engine remained on, as well as all power, but I just coasted as I tried to press the gas pedal. I stopped in the turn lane, shut off the ignition, waited a couple of minutes, then went on my way with full throtle response. The CEL stayed on but eventually went off later that day on my way home.

The 2nd time happened this morning, I was about to punch it to merge onto the highway and as soon as I pushed the gas pedal down hard, the CEL came back on and I had no throtle response. I had to coast off the highway and restart again.

I thought that maybe one of my coilpacks was going, but usually the engine just misses when that happens. I had zero throttle response. Anyone ever experience this? I appreciate any ideas.

Thanks,

 

[wildsmith]

I would have a look in the problems section of the faq, sounds like a APS problem, what happens if you floor it, do you get some response? If you have the code read it should also point you in the right general direction.

 

[e9999]

yup, that's what the OBD2 system is for. Read the code.

 

[jasong]

I had a similar issue with my '99... can't say what your issue is for sure until you pull codes, but mine was a bad throttle assembly. Your truck is just de-tunning itself to a "limp back" mode when the code is thrown. If it is a throttle problem, just hope its the throttle position sensor ($200 fix), not the throttle assembly ($1,500 fix).

 

[CRUIZIN]

I would have a look in the problems section of the faq, sounds like a APS problem, what happens if you floor it, do you get some response? If you have the code read it should also point you in the right general direction.

i know, i know, need to make it to vatozone to get the code, and then I will research. Thought it might be a common problem so wanted to check here first.

When I floored it, I got zero response.

 

[wildsmith]

When I floored it, I got zero response.

Not the APS then, that is set up to give you some limited (25%?) throttle when the pedal is to the floor. Problems in the throttle body assembly are not uncommon but there are a few components there that can be the cause. Get that code

 

[AimCOtaco]

I found a brand new TB for <$1k and no problems at all since... changed the TPS first per the code and the problem returned and reported motor failure once and APPS once so rather than buying it piecemeal I bit the bullet and the truck runs better than ever. There is a clutch and in-accessible gear train in there that can wear out.

Jump on the Scangauge II group buy and then you can read and reset codes yourself among other things..