2000 gmc k2500 odd power loss issue

Cadillac_jim · September 7, 2016

My truck has the 5.7l engine in it and I've had this issue only a handful of times. I was wondering if anyone else has had the same issue or has ideas on what to test.

The problem: every blue moon when I start the truck for the first time that day and am driving it feels like its choked out one way or another. I have extremely poor acceleration and seems like it simply doesnt wanna go. It only does this for about a mile or two then goes back to normal and drives fine the rest of the day. It seems to only happen on super humid days, after it rained overnight, or once after a car wash.

I haven't really checked anything out yet since it hardley ever happens. My air filter is brand new, and the truck has 106k mi on it.

ChumminsDQ · September 8, 2016

Id say cap and rotor. Fairly common issue esp if your noticing it during humid times.

Change cap, rotor and wires, should clean up the problem.

Cadillac_jim · September 9, 2016

Awesome, thanks! Replaced that, definitley had plenty of corrosion in there. The real test will be tomorrow morning, suppose to rain n be super humid again overnight.

ChumminsDQ · September 10, 2016

Hopefully the truck is running better!

Cadillac_jim · September 10, 2016

Well I replaced the cap and rotor only, still happening. Any sort of tests or visual checks I could do instead of replacing more stuff?

ChumminsDQ · September 12, 2016

No check engine light?

Could be a timing issue, just odd that it only does it an select times. Is the ignition coil acting as it should or any corrosion on it?

ChumminsDQ · September 12, 2016

Im just rattling my brain as much as possible remembering what else one truck I had, that had your identical symptoms, had going with it. Outside the obvious sparkplugs.

(All my trucks are diesels now)

barry G · September 14, 2016

wires.

plug wires or elsewhere.

these vortecs respond to equal length plug wires.

the first blowouts are passenger side rear.

the computer is sharp enough to kill the short ones...does not have a separate timer for short wires.

It is as silly as it seems written.

Cadillac_jim · September 16, 2016

Nope no check engine light and the truck always fires right up.

Wires n plugs are next on my list of things to do but I'm a broke college student at the moment who needs books, for now I'll just be letting my truck "warm up" on humid days. Not sure if thats bad in the long run?

I noticed some sets for as low as 30$ then up to 200 (performance set I assume). Whats the thoughts between BWD or AC Delco sets? Both have a set around 100$

ChumminsDQ · September 16, 2016

Dont do BWD , get AC Delco at minimal. There are certain things that "cheap" is ok but unleas you want this to pop up again sooner, get somethin a bit better than BWD.