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High engine revving and cut out after throttle body cleaning


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Anexamander
Novice

May 17, 2017, 1:19 PM

Post #1 of 9 (625 views)
High engine revving and cut out after throttle body cleaning Sign In

Hello, today I cleaned the throttle body and plate on my 1997 gmc sierra with 5.7 L vortex engine. Everything went great until I tried starting it... instantly revs up to about 35000 rpm and then the engine dies... this is probably quite simple and I apologize for wasting your time, but I'm in a pinch and couldn't find any information online.
Thanks,
G


(This post was edited by Anexamander on May 17, 2017, 1:21 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 17, 2017, 2:12 PM

Post #2 of 9 (613 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

? What did you do use a whole c
an with engine off maybe? These run lousy just anyway with air filter/snorkel parts just removed and do stall. That has to all be in place and in good shape or all bets off.


IDK - Some you can get air filter in all crocked and may notice bottom under there catches quite the odd debris - own one, this year to boot shocked at what junk - leaves and such are safe BEFORE filter and no clue why it isn't near leaves where it is but if all that junk went thru unfiltered would be trouble,
T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 17, 2017, 2:12 PM

Post #3 of 9 (610 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

That would be 3500 RPM.

I don't know if you took anything apart that could have damaged the IAC but try the reset procedure first. If this doesn't work, try disconnecting the battery for 5 minutes. When you restart it it will relearn the idle strategy.

  1. Turn the ignition switch to the ON position for 5 seconds.
  2. Turn the ignition switch to the OFF position for 10 seconds.
  3. Start the engine.
  4. Check for the proper idle operation.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Anexamander
Novice

May 17, 2017, 2:14 PM

Post #4 of 9 (605 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

Thanks I will try that now... what is the iac? I was pretty careful and I don't think I damaged anything. Will try the reset quick here


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 17, 2017, 2:18 PM

Post #5 of 9 (601 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

Idle Air Control





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Anexamander
Novice

May 17, 2017, 2:41 PM

Post #6 of 9 (596 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

Well those solutions did not seem to do much... so next I'll change the iac I suppose...


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 17, 2017, 2:44 PM

Post #7 of 9 (590 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

First make sure you didn't leave any hoses disconnected or damaged. Any unmetered air getting into the system can do that.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Anexamander
Novice

May 17, 2017, 2:44 PM

Post #8 of 9 (585 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

Will do! Thank you very much!


Anexamander
Novice

May 17, 2017, 4:58 PM

Post #9 of 9 (576 views)
Re: High engine revving and cut out after throttle body cleaning Sign In

So replaced both sensors with no luck... my mechanic buddy is gunna come take a look tonight so I'll let you know if we get it fixed and what the problem was


(This post was edited by Anexamander on May 17, 2017, 5:00 PM)






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