stumped

[warmpancakes]

Well the ty has new plugs, wire cap rotor, and fuel pump idles like a dream, but at part throttle cruising it has a stumbel or a buck, around 2200 RPM andy ideas? 98k on truck no smoke old plugs looked good basically a stock truck

 

[91blazins10]

Re: stumped

fuel filter maybe? couldnt hurt to change it and see if it goes away

 

[warmpancakes]

Re: stumped

Its laying on the garage floor, didnt get to it. for some reason the starter died when i was doing plugs??? Im gonna kick myself in the nuts if thats the problem

 

[JSM]

Re: stumped

stock chip/ecm map sensor?

 

[Don W.]

Re: stumped

Got a scan tool? Check the o2 sensor. Look at it idling. I should have a fairly uniform rise and fall. An "S" curve on its side so-to-speak.

 

[warmpancakes]

Re: stumped

stock chip/ecm map sensor?

yes, yes and yes, I reseated the chip map is a replacement

 

[alwayswantedone]

Re: stumped

Its laying on the garage floor, didnt get to it. for some reason the starter died when i was doing plugs??? Im gonna kick myself in the nuts if thats the problem

If this is the problem you have to have turbomom video the "kicking yourself in the nuts". That would just be hilarious. I chuckled a bit at the thought of it haha.

 

[JustBeachin]

Re: stumped

Im gonna kick myself in the nuts if thats the problem

I'm pretty sure that'd be harder than changing the plugs AND fuel pump.

 

[It's just a six]

Re: stumped

Maybe your TPS?

 

[CLONE]

Re: stumped

Things I would check....
TPS has a flat spot
MAP sensor bad or a vacuum leak to the sensor
Battery voltage at ECM is low
Bad grounds at ECM or engine
Most likely in my experience it is ignition related. Most stumbles on stockish trucks usually are ignition related.

 

[turbodog]

Re: stumped

After replacing the parts, did you disconnect the battery to reset BLM? Might want to do that, FWIW.

 

[pinellas50]

Re: stumped

After replacing the parts, did you disconnect the battery to reset BLM? Might want to do that, FWIW.

Does the computer go through some sort of learning process when the battery has been disconnected?

 

[warmpancakes]

Re: stumped

yep its a learning computer, First thig I do after I pop the hood even for a oil change is disconnect the battery, because its never just a "oil change"

 

[turbodig]

Re: stumped

Plugs look the same, or is one funkier than the others.

My gut would be

a) partially plugged injector
b) ignition
c) grounds/wiring

Fire up a scan tool, and log it when it happens.

 

[warmpancakes]

Re: stumped

Plugs look the same, or is one funkier than the others.

My gut would be

a) partially plugged injector
b) ignition
c) grounds/wiring

Fire up a scan tool, and log it when it happens.

iHave it narrowed down real well 1800-2000 rpm part throttle (no boost) when its shifing to OD is the most common time, Im gonna put it on the Dyno tonight and hook up a scope

 

[gimpin]

Re: stumped

ignition control modual?

mine had a similar issue but ended up being the fuel pump