Random Hesitation @ different speeds

[TxAlero]

Ok so Ive looked around the forum and found 1 thing that i thought was causing the hesitation (fuel filter) got that changed and it still does it. Took it to a shop and the guy there couldnt find a thing wrong saying it could be bad gas or water vapor? Drove it back and forth for 2 days nothing happened then the next day it happened a few times at different speeds and at different pressures on the gas petal.
So whats the deal? Any clues as the where to look next?:cry:

[Ttop191]

dying fuel pump possibly, or sticky injectors. There's a whole list of things it could be

[sleepyalero]

Had the same problem. Could never figure it out.. do your rpms jump too? Mine stopped it a month ago hasn't done it since. Its weird it did it for about 4 months then stopped.

[TxAlero]

dying fuel pump possibly, or sticky injectors. There's a whole list of things it could be

Never heard of a ful pump acually kicking it on an Alero, but Im sure its possible. What would make an injector sticky to the point of failing to delilver gas? And how would u be able to tell which one? Or could it be the electrial connection going bad to the injector. But wouldnt that just make it just misfire??

[TxAlero]

Had the same problem. Could never figure it out.. do your rpms jump too? Mine stopped it a month ago hasn't done it since. Its weird it did it for about 4 months then stopped.

Somewhat ya the rpms do go up a bit. Mine is cold stock so Im not sure If you and I are having the same issues.

[Ttop191]

a sticky injector could have just been caused by dirty fuel, if its just a little sticky and not completely stuck it would take slightly longer for it to open, and therefore a delay in receiving the fuel, and also less fuel to be delivered since the injector isn't open for as long

[Lucalare]

He said it's at certain pressures on the throttle, could it be something to do with the TPS? Just a thought.

[hotrodwolf]

Never heard of a ful pump acually kicking it on an Alero, but Im sure its possible. What would make an injector sticky to the point of failing to delilver gas? And how would u be able to tell which one? Or could it be the electrial connection going bad to the injector. But wouldnt that just make it just misfire??

I dont know what motor you have, but on the 3400, ive gone through two pumps, and have a spare ready. They definately do go out on aleros. My random misfire ended up being bad wires, one was taking 14500 ohms, the new one was at 3000 ohms.

[xXManwhoreXx]

My random misfire ended up being bad wires, one was taking 14500 ohms, the new one was at 3000 ohms.


GEEZ!

@Op... I would deff check your TPS. Are you not throwing any codes?

[hotrodwolf]

The guy before me must have gotten very cheap wires, they looked pristine and new, but alas, they sucked

[TxAlero]

well I finally got an answer to why my engine was stalling and hesitating. The ICM has gone belly up. So I will be replacing that along with 3 new coil packs and spark plug wires to boot. :rolleyes2:
All at the sum of 240$. :nuts:

[scott192]

are you running a K&N filter if so clean your Mass air flow sensor thats caused weird surging in my car

[scott192]

haha i must read^^