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IM having drag on the engine

Tiny
DELL12
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 160 MILES
I drive a 2003 chevy trailblazer. I just cleaned the throttle body and now im having serious drag on the engine, and it stops abruptly when I take my foot off the gas. I cleaned it and replaced it the right way, the only thing I can think of is that to get to the two bottom screws on the throttle body I had to remove two of the coils above the spark plugs. What could be causing this?
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Friday, September 7th, 2012 AT 4:06 PM

11 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the MIL indicating and have you checked for trouble codes?

Check the throttle position sensor connector and ensure it is plugged in tightly.

What is the idling speed? Seems something is wrong with the cleaning.
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Friday, September 7th, 2012 AT 4:08 PM
Tiny
DELL12
  • MEMBER
  • 6 POSTS
My check engine or any other lights don not come on, the vehicle starts fine but when you listen to the idle it becomes quieter as you let it sit, and you can feel serious drag when you start to drive and as soon as my foot leaves the gas pedal it completely stops. Everything fit on just as nicely as they did before I took them off, everything went back into the same place as it came from. Does it matter that I did not use any cleaner I just wiped all of the gunk out with a clean rag?
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Friday, September 7th, 2012 AT 4:17 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
It does matter. Wiping does not clean the air passages and instead of cleaning, you could have pushed some gunk into air passages causing more harm than good.
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Friday, September 7th, 2012 AT 4:25 PM
Tiny
DELL12
  • MEMBER
  • 6 POSTS
Would that cause such a drastic problem? It cant be driven in the condition it is in with the way that it stops almost immediately after I let off the gas. Would taking it off again and re-cleaning it with proper cleaner solve this?
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Friday, September 7th, 2012 AT 4:29 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Yes because the if idle air passage is restricted, the engine would not be able to idle correctly causing the stalling which you are experiencing now. I would sugges you get a can of carb cleaner to clean the throttle body.
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Friday, September 7th, 2012 AT 4:33 PM
Tiny
DELL12
  • MEMBER
  • 6 POSTS
Alright, I will try that and get back to you. Thank you very much.
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Friday, September 7th, 2012 AT 4:34 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome.
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Friday, September 7th, 2012 AT 4:37 PM
Tiny
DELL12
  • MEMBER
  • 6 POSTS
I took it all apart again, and cleaned it out with carb cleaner and it is spotless, then put it all back together the right way but the problem still occurs. What else could be causing it?
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Friday, September 7th, 2012 AT 8:19 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you clean the part where the throttle plate closes? What about any other ports inside the throttle body? Was the IAC cleaned?
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Friday, September 7th, 2012 AT 8:48 PM
Tiny
DELL12
  • MEMBER
  • 6 POSTS
Basically all I did was clean the throttle bore and the throttle plate until it was spotless, and then reassembled everything. What else is there to clean that could be the problem in that area?
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Friday, September 7th, 2012 AT 9:00 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Inside the throttle bore there are air passages (ports on side of bore). Spray carb cleaner into those to get the air passages clear. Let it soak for a while and spray again.

When trying to start, it might be difficult and after starting it would stumble until the carb cleaner is cleared.
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Saturday, September 8th, 2012 AT 10:29 AM

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