EGR problem.
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EGR problem.
My Dads truck is 1989 F150 with a 5.0L and has a problem with an EGR code. Ive put a vacuum pump on the EGR valve and the engine wants to die, so it is opening. I also removed it and checked to make sure it is closing. Which it is. How would I determine if it is the solenoid thing or the position sensor?
KOEO
81 Air Diverter selonoid fault
82 same?
CM
31 EVAP control below minimum voltage
KOER
33 EGR Valve Fault.
44 Thermactor air system fault
52 Power steering pressure switch open
The EVAP and Thermactor codes are because those systems are just *gone*. The only thing left of EVAP is the charcoal canister and that looks like someone took a hammer to it. I also discovered the air solenoids were not hooked to anything, so I disconnected them to prevent a vacuum leak.
KOEO
81 Air Diverter selonoid fault
82 same?
CM
31 EVAP control below minimum voltage
KOER
33 EGR Valve Fault.
44 Thermactor air system fault
52 Power steering pressure switch open
The EVAP and Thermactor codes are because those systems are just *gone*. The only thing left of EVAP is the charcoal canister and that looks like someone took a hammer to it. I also discovered the air solenoids were not hooked to anything, so I disconnected them to prevent a vacuum leak.
Fleet Owner
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From: Easton,Ks
First of all make sure you still have a vacuum source going to the EGR solenoid after you disconnected the two A.I.R solenoids.
Service Code 33 in Key On Engine Running indicates that the EVP sensor input did not change after the EVR solenoid was instructed by the processor to open the EGR valve. Because a Code 84 was not received in the Key On Engine Off Self-Test, it is known that the EVR solenoid functions electrically. It is also known that the EVP sensor is in the expected closed valve range because Code 32 and 34 were not received in either Key On Engine Off or Key On Engine Running Tests.
Possible causes:
Vacuum hose leaks
Obstructed vacuum hose
Obstructed EVR solenoid filter
Damaged EVR solenoid.
Damaged EVP sensor.
Damaged EGR valve
You could try grounding the Dark Green wire at the EGR solenoid with the engine running and see if the the engine wants to die.
Service Code 33 in Key On Engine Running indicates that the EVP sensor input did not change after the EVR solenoid was instructed by the processor to open the EGR valve. Because a Code 84 was not received in the Key On Engine Off Self-Test, it is known that the EVR solenoid functions electrically. It is also known that the EVP sensor is in the expected closed valve range because Code 32 and 34 were not received in either Key On Engine Off or Key On Engine Running Tests.
Possible causes:
Vacuum hose leaks
Obstructed vacuum hose
Obstructed EVR solenoid filter
Damaged EVR solenoid.
Damaged EVP sensor.
Damaged EGR valve
You could try grounding the Dark Green wire at the EGR solenoid with the engine running and see if the the engine wants to die.
Thread Starter
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New User
Joined: Dec 2009
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First of all make sure you still have a vacuum source going to the EGR solenoid after you disconnected the two A.I.R solenoids.
Service Code 33 in Key On Engine Running indicates that the EVP sensor input did not change after the EVR solenoid was instructed by the processor to open the EGR valve. Because a Code 84 was not received in the Key On Engine Off Self-Test, it is known that the EVR solenoid functions electrically. It is also known that the EVP sensor is in the expected closed valve range because Code 32 and 34 were not received in either Key On Engine Off or Key On Engine Running Tests.
Possible causes:
Vacuum hose leaks
Obstructed vacuum hose
Obstructed EVR solenoid filter
Damaged EVR solenoid.
Damaged EVP sensor.
Damaged EGR valve
You could try grounding the Dark Green wire at the EGR solenoid with the engine running and see if the the engine wants to die.
Service Code 33 in Key On Engine Running indicates that the EVP sensor input did not change after the EVR solenoid was instructed by the processor to open the EGR valve. Because a Code 84 was not received in the Key On Engine Off Self-Test, it is known that the EVR solenoid functions electrically. It is also known that the EVP sensor is in the expected closed valve range because Code 32 and 34 were not received in either Key On Engine Off or Key On Engine Running Tests.
Possible causes:
Vacuum hose leaks
Obstructed vacuum hose
Obstructed EVR solenoid filter
Damaged EVR solenoid.
Damaged EVP sensor.
Damaged EGR valve
You could try grounding the Dark Green wire at the EGR solenoid with the engine running and see if the the engine wants to die.
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I went and ran vacuum hose to the various items and got rid of that brittle plastic tree. Still same EGR code.
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Fleet Owner
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From: Easton,Ks
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Well, I discovered I hooked the hoses to the can backwards, so it was getting very little vacuum. I switched them around. I did just now ground the green wire and the engine is responding. I shut it off then re-did the test and 33 came back.
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