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I cleaned the throttle plate and now the engine idles fast.I…

Customer Question
I cleaned the throttle...

I cleaned the throttle plate and now the engine idles fast.I tried unhooking the battery for 15 min.and no good. I have no vacume leaks and now I am lost.2007 Chevy 4.8 V-8 gas

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

The truck has 134k miles on it and I thought it is time to clean the MASS sensor and clean the throttle plate

Submitted: 2 years ago.Category: Chevy
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Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
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1/28/2016
Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago
Roy
Roy, import/domestic specialest
Category: Chevy
Satisfied Customers: 7,453
Experience: ASE master tech for 40 years
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good afternoon my name is ***** ***** I will assist

how bad was the throttle body??? was it carboned up badly???

Roy

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Customer reply replied 2 years ago
NO not bad at all
Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago

it sounds like the throttle plate is hanging up and not closing all the way. re check it to verify the plate is closing all the way

Roy

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Customer reply replied 2 years ago
the plat closes all the way but as soon as the engine starts it opens up a little
Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago

was this an issue prior to cleaning??

Roy

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Customer reply replied 2 years ago
No, it ran and idled good.I cleaned it because of the miles on the engine
Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago

I would try re cleaning it. it sounds like the plate is not seating properly. if that does not work, you may have to replace the throttle body

Roy

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Customer reply replied 2 years ago
Allready tried recleaning it and no good.I do not want to replace the throttle body because it idled ok before
Chevy Mechanic: Roy, import/domestic specialest replied 2 years ago

ok, then without me being there, I cannot help you any more. I will open it up to other guys to see what there opinions are at this point

Roy

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Customer reply replied 2 years ago
Am I still going to be charged without correcting the problem? Other people on the net have the same problem and they have replaced the throttle body and still have the problem.I have been a mechanic for 45 years and have never had this problem that is why I am trying you.
Chevy Mechanic: camerontech, Auto Mechanic replied 2 years ago
camerontech
camerontech, Auto Mechanic
Category: Chevy
Satisfied Customers: 693
Experience: diagnostic auto tech
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hi there

im cam, a licenced diagnostic tech.

dont worry, you dont pay untill you are satisfied and rate us!

did you do a idle relearn on this after cleaning the throttle body?

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Chevy Mechanic: camerontech, Auto Mechanic replied 2 years ago

any time a throttle body is cleaned and replaced , there should be an idle relearn performed,

this should be done with KOEO, not running.

most people do it with the engine running, than it doesnt work. the engine must be off with key on for it to learn.

i have had to send a few to the dealer just to have the pcm reflashed as the idle learn doesnt always work ffor some reason. but the reflash always works

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Customer reply replied 2 years ago
nothing is correcting the problem and I do not want to send it to a dealer because it was fine before I cleaned the throttle plate.I do not know what went wrong because I did not remove any wires and used the correct cleaner for throttle bodies.I have cleaned over 100 when I worked for UPS with no problems. It was a scheduled repair on all gas trucks at work.I am pulling out my hair on this one.All the numbers are OK on the scan tool I use.When I start the engine all is OK until I touch the throttle pedal,some times it will return to the correct idle after 10 seconds and other times it runs 1800 RPMS
Chevy Mechanic: camerontech, Auto Mechanic replied 2 years ago

there is a chance the throttle body was damaged during cleaning. it doesnt take much when pushing on the plate that it can throw it off.

they can be damaged while cleaning.

i realize you dont want to take it to the dealer, but it could just require a simple reflash.

i have probably done a thousand of these tb services, and they should all have a relearn with a tech 2 after and some have required a flash after.

the way you describe it, its either binding or the pcm is the issue

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