Question About--EGR Valve Temperature Switch
Thread Starter
Race Director
Joined: Jan 2004
Posts: 18,725
Likes: 709
From: Bergen County, NJ
Question About--EGR Valve Temperature Switch
I broke this wire today , when replacing my EGR pipe insulation sleeve.
[Its on the EGR Valve Temperature Switch]
I started the Vette and drove it with this wire disconnected, didn't notice any difference.
Question: What purpose does this wire serve ???
[Its on the EGR Valve Temperature Switch]
I started the Vette and drove it with this wire disconnected, didn't notice any difference.
Question: What purpose does this wire serve ???
Racer
Joined: Oct 2002
Posts: 416
Likes: 2
From: Westfield MA
I'll quote from my Helm's manual. "This switch is normally open(cold) and closes with heat from the exhaust gas, when the EGR is operating. The ECM monitors this switch for proper operation and should set a Code 32, if the system fails." So, all it basically does is tell the computer that the EGR system is functioning ok.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Be careful that you do not twist the "metal post" in the temp unit as this is used to calibrate the temp device. I believe a new switch is about $15 from the GM dealer. Just trying to be helpful!
SAM
SAM
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Slip a section of heat shrink tubing over the wire before soldering it back onto the sensor; then slide it down over the solder joint and shrink it down for a good seal.
The ECM checks the EGR sensor:
-once at start up, will set a code 32 if the switch is then closed
-once after it calls for EGR, will set a code 32 if the switch is open
The ECM only calls for EGR when engine load is minimal and coolant temp is over 175deg F, as while cruizing on the highway with a stock setup.
The ECM checks the EGR sensor:
-once at start up, will set a code 32 if the switch is then closed
-once after it calls for EGR, will set a code 32 if the switch is open
The ECM only calls for EGR when engine load is minimal and coolant temp is over 175deg F, as while cruizing on the highway with a stock setup.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I tried resoldering mine, ended up buying a new one. It never threw a code though. Hmm.
If you want to test it... Hook a continuity tester across the body and the wire, and hold a lighter under the end. Should take 10 seconds or so to show continuity.
If you want to test it... Hook a continuity tester across the body and the wire, and hold a lighter under the end. Should take 10 seconds or so to show continuity.
Drifting
Joined: Dec 2003
Posts: 1,493
Likes: 94
From: Westfield MA
When my switch went bad, I got a code, if I remember right, the conditions are such that it has to be commanding EGR, the coolant temperature has to be above a certain threshold and 4 minutes must go by. I never got a code until I replaced my thermostat, then 4 minutes down the highway the light would come on.
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Drifting
Joined: Mar 2005
Posts: 1,923
Likes: 0
From: GA
Originally Posted by Onlya1
I got a 32 code yesterday but where exactly is the EGR switch? I recently changed my exhaust to a magnaflow system, will post pics soon.
