Firebird 3.1 Purge Valve resistance
09-13-2021, 03:14 AM
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Car: '1991 Pontiac Firebird
Engine: LH0 - V6 3.1
Transmission: TH700R4 automatic
Firebird 3.1 Purge Valve resistance
Hello guys,
I have issues with my Firebird idling rough. We have replaced the TPS, the coolant sensor, MAT, Delphi IAC, Fuel Injectors, Ignition Coil / cables, O2 sensor, EGR valve and many other things. Then we checked the EVAP canister valve. I have two canisters and both of them show a strange resistance behaviour.
Measuring the resistance between the two terminals it starts from approx. 1200 Ohm and keeps decreasing while measuring for just a few seconds to ~300 Ohm and lower. I have read somewhere else that the Purge Valved should be around 20-30 Ohm. Is there any varistor causing this, or are both of the valves completely out of service.
Engine is a T-Code 3.1 (LH0)
I have issues with my Firebird idling rough. We have replaced the TPS, the coolant sensor, MAT, Delphi IAC, Fuel Injectors, Ignition Coil / cables, O2 sensor, EGR valve and many other things. Then we checked the EVAP canister valve. I have two canisters and both of them show a strange resistance behaviour.
Measuring the resistance between the two terminals it starts from approx. 1200 Ohm and keeps decreasing while measuring for just a few seconds to ~300 Ohm and lower. I have read somewhere else that the Purge Valved should be around 20-30 Ohm. Is there any varistor causing this, or are both of the valves completely out of service.
Engine is a T-Code 3.1 (LH0)
Last edited by aycaramba; 09-13-2021 at 06:58 AM. Reason: Added some more parts which were replaced.
09-15-2021, 04:02 AM
#2
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Join Date: Jun 2017
Location: Hanover
Posts: 17
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Car: '1991 Pontiac Firebird
Engine: LH0 - V6 3.1
Transmission: TH700R4 automatic
Re: Firebird 3.1 Purge Valve resistance
Update:
After using another Multimeter the resistance showed up a value around 30 Ohm, which seems to be okay. Thread can be closed.
Thx.
After using another Multimeter the resistance showed up a value around 30 Ohm, which seems to be okay. Thread can be closed.
Thx.
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