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2001 Silverado High Idle Code Po507

2001HIGHBOYSILVERADO

By 2001HIGHBOYSILVERADO
in Ask A GM Technician

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tobias Senior Enthusiast

tobias

Posted
Posted
I think that YOU HAVE A VACUUM LEAK. CHECK THE INTAKE area.

 

Hey Mike, your CAPS LOCK IS ON. :D

 

 

I like your SIG FORMATTING, DAN! :D

2000DV4.8 Senior Enthusiast

2000DV4.8

Posted
Posted
I think that YOU HAVE A VACUUM LEAK. CHECK THE INTAKE area.

 

Hey Mike, your CAPS LOCK IS ON. :D

 

 

I like your SIG FORMATTING, DAN! :D

 

 

Thanks I thought of it ALL BY MYSELF. :D

2001HIGHBOYSILVERADO Enthusiast

2001HIGHBOYSILVERADO

Posted
  • Author
Posted
MY 2001 SILVERADO WITH A 4.8 HAS HIGH IDLE APROX 1000 TO 900 AND THROWS CODE PO 507 ANY IDEAS HAS NEW IAC ALL VACCUM HAS BEEN INSPECTED RUNS GOOD NO DRIVABILITY PROBLEMS

 

INTAKE HAS BEEN OFF WITH NEW GASKETS STILL THE SAME I AM A DODGE CHRYSLER TECH THIS IS MY DADS TRUCK COULD PCV OR PURGE CAUSE A BIG ENOUGH LEAK THAT THE IAC CANT COMPINSATE FOR IT

2000DV4.8 Senior Enthusiast

2000DV4.8

Posted
Posted

NOT SURE BUT PLEASE TURN OFF YOUR CAPS LOCK, IT SOUNDS LIKE YOU'RE YELLING AT US AND IT'S HARD TO READ. THANKS.

 

EDIT: Punctuation is also fun. :D:D

2001HIGHBOYSILVERADO Enthusiast

2001HIGHBOYSILVERADO

Posted
  • Author
Posted
NOT SURE BUT PLEASE TURN OFF YOUR CAPS LOCK, IT SOUNDS LIKE YOU'RE YELLING AT US AND IT'S HARD TO READ. THANKS.

 

EDIT: Punctuation is also fun. :D:D

 

 

Sorry about the cap locks and thanks for the replies let me tell you guys how it happens I can erase the cde truck will be fine then when driven and stoped when put into park the idle will spike and not return to propper idle and the check light will come on with genaric code po507 poss GM code p1508 or 1509 and sorry about my typing

thank you

minibike132 Senior Enthusiast

minibike132

Posted
Posted
MY 2001 SILVERADO WITH A 4.8 HAS HIGH IDLE APROX 1000 TO 900 AND THROWS CODE PO 507 ANY IDEAS HAS NEW IAC ALL VACCUM HAS BEEN INSPECTED RUNS GOOD NO DRIVABILITY PROBLEMS

 

INTAKE HAS BEEN OFF WITH NEW GASKETS STILL THE SAME I AM A DODGE CHRYSLER TECH THIS IS MY DADS TRUCK COULD PCV OR PURGE CAUSE A BIG ENOUGH LEAK THAT THE IAC CANT COMPINSATE FOR IT

 

 

If you replaced the IAC the idle position needs to be relearned. To answer your question yes, pretty much any little leak is going to throw this off. I chased one early in the summer for the better part of a day. I knew there was a vacuum leak because if the IAC is doing what it should (you need to verify that it is actually working) then there has to be a leak. That one turned out to be the hole in the throttle body for the throttle plate shaft had worn out allowing air in. You have to remember any air that is getting in that isn't calculated to get in is a vacuum leak.

2001HIGHBOYSILVERADO Enthusiast

2001HIGHBOYSILVERADO

Posted
  • Author
Posted
MY 2001 SILVERADO WITH A 4.8 HAS HIGH IDLE APROX 1000 TO 900 AND THROWS CODE PO 507 ANY IDEAS HAS NEW IAC ALL VACCUM HAS BEEN INSPECTED RUNS GOOD NO DRIVABILITY PROBLEMS

 

INTAKE HAS BEEN OFF WITH NEW GASKETS STILL THE SAME I AM A DODGE CHRYSLER TECH THIS IS MY DADS TRUCK COULD PCV OR PURGE CAUSE A BIG ENOUGH LEAK THAT THE IAC CANT COMPINSATE FOR IT

 

 

If you replaced the IAC the idle position needs to be relearned. To answer your question yes, pretty much any little leak is going to throw this off. I chased one early in the summer for the better part of a day. I knew there was a vacuum leak because if the IAC is doing what it should (you need to verify that it is actually working) then there has to be a leak. That one turned out to be the hole in the throttle body for the throttle plate shaft had worn out allowing air in. You have to remember any air that is getting in that isn't calculated to get in is a vacuum leak.

 

 

Thank you for your response I did find a small tear in the hose right after the maf sensor but this is before the throttle body could this poss be a prob and I did notice that when first started idle is good at 650 after warmming a bit it starts climbing to end up at about 1000 your advice is good and thank you I will try spraying everhting and see if I get any veriation and btw how is the iac reset on a gm just reset all values back to base or will a battery disconect due it thank you very much for your time and if you ever need chrysler jeep dodge help let me know been a drivability tech on them for 25 years

minibike132 Senior Enthusiast

minibike132

Posted
Posted
MY 2001 SILVERADO WITH A 4.8 HAS HIGH IDLE APROX 1000 TO 900 AND THROWS CODE PO 507 ANY IDEAS HAS NEW IAC ALL VACCUM HAS BEEN INSPECTED RUNS GOOD NO DRIVABILITY PROBLEMS

 

INTAKE HAS BEEN OFF WITH NEW GASKETS STILL THE SAME I AM A DODGE CHRYSLER TECH THIS IS MY DADS TRUCK COULD PCV OR PURGE CAUSE A BIG ENOUGH LEAK THAT THE IAC CANT COMPINSATE FOR IT

 

 

If you replaced the IAC the idle position needs to be relearned. To answer your question yes, pretty much any little leak is going to throw this off. I chased one early in the summer for the better part of a day. I knew there was a vacuum leak because if the IAC is doing what it should (you need to verify that it is actually working) then there has to be a leak. That one turned out to be the hole in the throttle body for the throttle plate shaft had worn out allowing air in. You have to remember any air that is getting in that isn't calculated to get in is a vacuum leak.

 

 

Thank you for your response I did find a small tear in the hose right after the maf sensor but this is before the throttle body could this poss be a prob and I did notice that when first started idle is good at 650 after warmming a bit it starts climbing to end up at about 1000 your advice is good and thank you I will try spraying everhting and see if I get any veriation and btw how is the iac reset on a gm just reset all values back to base or will a battery disconect due it thank you very much for your time and if you ever need chrysler jeep dodge help let me know been a drivability tech on them for 25 years

 

 

Absolutely could be the problem, that equals unmetered air entering the engine. Is this auto or manual trans?

2001HIGHBOYSILVERADO Enthusiast

2001HIGHBOYSILVERADO

Posted
  • Author
Posted
MY 2001 SILVERADO WITH A 4.8 HAS HIGH IDLE APROX 1000 TO 900 AND THROWS CODE PO 507 ANY IDEAS HAS NEW IAC ALL VACCUM HAS BEEN INSPECTED RUNS GOOD NO DRIVABILITY PROBLEMS

 

INTAKE HAS BEEN OFF WITH NEW GASKETS STILL THE SAME I AM A DODGE CHRYSLER TECH THIS IS MY DADS TRUCK COULD PCV OR PURGE CAUSE A BIG ENOUGH LEAK THAT THE IAC CANT COMPINSATE FOR IT

 

 

If you replaced the IAC the idle position needs to be relearned. To answer your question yes, pretty much any little leak is going to throw this off. I chased one early in the summer for the better part of a day. I knew there was a vacuum leak because if the IAC is doing what it should (you need to verify that it is actually working) then there has to be a leak. That one turned out to be the hole in the throttle body for the throttle plate shaft had worn out allowing air in. You have to remember any air that is getting in that isn't calculated to get in is a vacuum leak.

 

 

Thank you for your response I did find a small tear in the hose right after the maf sensor but this is before the throttle body could this poss be a prob and I did notice that when first started idle is good at 650 after warmming a bit it starts climbing to end up at about 1000 your advice is good and thank you I will try spraying everhting and see if I get any veriation and btw how is the iac reset on a gm just reset all values back to base or will a battery disconect due it thank you very much for your time and if you ever need chrysler jeep dodge help let me know been a drivability tech on them for 25 years

 

 

Absolutely could be the problem, that equals unmetered air entering the engine. Is this auto or manual trans?

 

 

It is a auto 4/4 4.8 ltr

minibike132 Senior Enthusiast

minibike132

Posted
Posted

 

  • Turn OFF the ignition.
  • Turn OFF the A/C controls.
  • Saftey first :lol: ,Set the parking brake and block the drive wheels.
  • Start the engine.
  • Ensure that the engine coolant temperature is more than 176°F. You know closed loop just start it and go get a cup of coffee.
  • Foot on the brake,shift into Drive.
  • Allow the engine to idle for 5 minutes.
  • Shift into Park.
  • Idle for 5 more minutes.
  • Turn OFF the engine for 30 seconds.

 

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