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My 2001 GMC Sierra 4x4 with a 5.3 l motor starts and then…

My 2001 GMC Sierra...

My 2001 GMC Sierra 4x4 with a 5.3 l motor starts and then immediately revs so high I have to shut it dow.

Mechanic's Assistant: Will the headlights turn on? Is the battery fully charged?

Brand new battery and lights work

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Yes. Put a throttle position sensor on. No help there.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Has headers.

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Answered in 11 minutes by:
1/19/2018
david craig
david craig, ASE Certified Technician
Category: GM
Satisfied Customers: 6,045
Experience: owner/mechanic at 3D Automotive
Verified

Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

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try disconnecting the mass airflow sensor and starting the engine

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Customer reply replied 7 months ago
Ok. It is toward the back of the intake manifold I think
Customer reply replied 7 months ago
No luck with the removal of mass air flow sensor

still revving high with it disconnected?

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Customer reply replied 7 months ago
itt is.

ok. standby please

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Customer reply replied 7 months ago
Ok

check engine light?

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Customer reply replied 7 months ago
No but does It have to run longer?

no. what happens if you disconnect the tps?

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Customer reply replied 7 months ago
Ok, one minute please

ok

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Customer reply replied 7 months ago
It seems to be idling pretty good right now.
Customer reply replied 7 months ago
Now it died

ok, did you reconnect the mass airflow sensor?

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Customer reply replied 7 months ago
Ok, it started and idled with both tps and mass airflow sensor off. About 3000 rpm but steady.

ok, let try this. disconnect both battery terminals. rub them together for 30 seconds.let them hang loose for 30 minutes then reconnect them. this is a master reset of all of the modules.

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Customer reply replied 7 months ago
Ok. Will do it .

let me know. Ill be here

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Customer reply replied 7 months ago
K. Should I reconnect the two sensors before I try to start it?

yes

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Customer reply replied 7 months ago
It went back to high rev. Had to shut it down.

did you happen to remove the throttlebody for any reason?

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Customer reply replied 7 months ago
To install new tps

ok, then did you put a new throttle body gasket on?

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Customer reply replied 7 months ago
No

did you replace the tps for this exact reason?

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Customer reply replied 7 months ago
Ok. Where is it located?

open the attachment.

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Customer reply replied 7 months ago
Done. Try it again?

yes

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hows it going?

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Customer reply replied 7 months ago
I hate to cut our process short but I have to go pick someone up. How do I go about paying you? You have been very helpful.

you can rate me now, thanks, ***** ***** can continue when you are ready

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did disconnecting the pedal sensor do anything?

david craig
david craig, ASE Certified Technician
Category: GM
Satisfied Customers: 6,045
Experience: owner/mechanic at 3D Automotive
Verified
david craig and 87 other GM Specialists are ready to help you
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Customer reply replied 7 months ago
No.

ok. let me think about this. ill get back to you.

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Amedee
Amedee, GMC Technician
Category: GM
Satisfied Customers: 470
Experience: ASE certified tech with advanced level specialist. Wisconsin certified emissions state inspector
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david craig
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