Hesitation at acceleration

[ctaylor2]

I have a 2000 S-10 and with 64000 miles and it just started to hesitate bad at accelerating from a stop only it accelerates fine when passing. I changed plugs, wires and fuel filter at 50000 miles so can anyone help me where should I start looking.

Thanks

[vtmecheng]

First, what brand of ignition system components did you use? Next, have you ever cleaned the throttle body out with throttle body cleaner. My father-in-law has a 2000 Blazer that had the same problem. There was so much gunk in the throttle body that it took and hour, a whole bottle of cleaner, and three rags to clean it out. He had never cleaned it and the crapy shop he takes it to never took the time.

[ctaylor2]

Originally Posted by vtmecheng

First, what brand of ignition system components did you use? Next, have you ever cleaned the throttle body out with throttle body cleaner. My father-in-law has a 2000 Blazer that had the same problem. There was so much gunk in the throttle body that it took and hour, a whole bottle of cleaner, and three rags to clean it out. He had never cleaned it and the crapy shop he takes it to never took the time.

No I have not cleaned the Throttle body but I will try that. Ive aways used the mix with gas cleaner. Thanks I will clean it good and see what happens.

[vtmecheng]

Make sure you wait a while before starting the engine when using the throttle body cleaner. On older engines, like my '95, you could start the engine and rev it up a bit while spraying into the throttle body but yours requires everything to be connected for it to work (Mass-Air flow sensor). If you wait a while before starting the engine it will allow time for the cleaner to evaporate. Also, don't be surprised if it is hard to start at first. What brand of ignition parts did you put on the truck at the last tune-up.

[ctaylor2]

Cleaned Throttle Body was not that dirty and still same Hesitation at fast acceleration anyone with any other ideas.

Thanks vtmecheng

[vtmecheng]

The reason I keep asking about the brand of parts you used in your tune up is because our trucks really don't like anything but AC Delco. For some reason most shops use Bosch or other brands, that make our trucks run like poop.

[BlazerLT]

Clean your MAF sensor by removing it from the vehicle and spraying brake cleaner through it to remove the deposits from the MAF wires.

To get the rest of it off if it is really grungy, take a q-tip and very VERY gently remove the reset of the dirt from the sensor wires.

[movin2stereo]

I had Bosch platium +4s in my truck and it ran like poop.I put AC Delco platiums in cleaned the MAF like BlazerLT said and I noticed a difference.Try it out.

[vtmecheng]

Hey BlazerLT, where is the MAF sensor? I have never touched mine after 138000 and wonder if it wouldn't help to give it a bath.

[atomicpulse]

it should be right after your air cleaner assembly and it will be connect to the air flow duct that runs into the throttle body. Its worth cleaning as well, I just cleaned my a few days ago and I can notice the difference

[ctaylor2]

Thanks to all
I believe I did use Bosch plugs I will change them even thought changing that one plug can be a pain in the ohhhh.
I will also try cleaning the MAF sensor and see what that does I will let U know how I make out.
Thanks again

[ctaylor2]

Tried cleaning the MAF sensor and installed new AC plugs gaped at .60 and still no luck.
Also took the time to try and clean the EGR valve and none of these were that gummed up.
Appreciate any other ideas you might have.

Thanks

[vtmecheng]

I hate for you to just throw parts at it but...How old is your O2 sensor? It can screw up your mixture if not working properly. A new AC delco from the dealer is only $45. But like I said, this throwing parts at it sucks. Have you looked at a Haynes book for it?

[Mikado14]

Have you checked your IAC? Simple job to remove and clean. You mention that the hesitation is from a dead stop but when you pass a car it accelerates fine. The difference here is the IAC. It would be something to check since it only operates when idling.

[BlazerLT]

When is the last time you did a tuneup?