A weird hesitation....

bigtallcampbell · July 24, 2004

Ok....the truck is running great except for one thing. It just started happening....

When I'm idling and just barely push on the throttle (we're talking somewhere in the range of 5-10%...no more) the RPMs drop (almost like its going to die) and then pick back up. If I mash on it...it drops for a second and catches up. Higher-Reving throttle response seems to be just like it always is, but this hesititation makes me nervous even when I'm pulling into traffic

I've just got done replacing the cap and rotor...no difference. Replaced the fuel filter...no difference. The plugs and wires have about 5K miles on them...should be fine. Just did an oil change last week.

Anyone have any ideas? The next thing I'm going to do is a throttle body cleaning with some seafoam, but I have to be honest....it seems like it is a shot in the dark.

GF7PE · July 24, 2004

hows the air filter?

bigtallcampbell · July 24, 2004

Air Filter is brand new......

I took some ChemTool to the throttle body and got the junk off of it......didn't help.

RyanZ71 · July 25, 2004

Fuel Injectors need cleaning?

RyanZ71 · July 25, 2004

condition of spark plugs, wires, fuel filter, PCV Valve?

dannyukonxl · July 25, 2004

id have to say something involved with fuel delivery, i had this problem on my dirtbike, id snap the throttle and not enough gas was being fed at idle so it would bog and stall, basically creating a lean situation, i stuck in a new leak jet to get more fuel in there and the bog is all gone,

facn8me · July 25, 2004

throttle position sensor should be the problem. I am assuming you are talking about the 94. a scanner would show easily if you have access to one. can be easily done with an ohm meter but i do not have a scematic handy to tell exactly what pins to check to be sure. but you can back probe the sensor(do not damage wires.) find the 5v reference wire then check the other 2 pins on the tps for a glitch with an ohm meter

lattero65 · July 25, 2004

Start with the cheapest thing first FUELFILTER

unkleJ · July 26, 2004

I would say its either the TPS or the IAC, both are rather cheap to replace. My old s10 with a TBI went through 2 IAC's in 75k miles. You can change the fuel filter, but I would bet money that it's not going to do anything.

SteveCZ · July 26, 2004

Ummmm, I think he said he already replaced the Fuel Filter, Plugs and Wires.

I've just got done replacing the cap and rotor...no difference. Replaced the fuel filter...no difference. The plugs and wires have about 5K miles on them...should be fine. Just did an oil change last week.

Like said before, the PCV wouldn't hurt.... if you didn't do that when you did the air filter.

I would lean towards the TPS also.........

bigtallcampbell · July 26, 2004

Well...I put some Octane boost into her and ran it a little bit. Hesitation went away...I'm guessing it was some bad gas. Thanks guys! We'll see if it stays away.

RyanZ71 · July 26, 2004

Don't go too overboard with the Octane booster, it can cause major problems! I'd still run a bottle of Techron fuel injector cleaner through there on your next fill up.