Volvo 940 Rich/Lean Codes Tried Everything!
#1
Volvo 940 Rich/Lean Codes Tried Everything!
I have a '94 940 Turbo wagon (208k miles). CEL came on about a month ago. Since then I have fiddled with it and gotten 2-3-1/2-2-1/1-1-3 codes in A2.
So I replaced the oxygen sensor. It was fine for a few days then came back on halfway between Atlanta and Charleston. Replaced the ECT and flushed coolant. Came back on almost immediately.
When I was doing this I took the throttle body off. Noticed it was a little wet on the butterfly valve on the downstream side. That turned my attention to the fuel pressure regulator. Replaced that with a unit that hadn't given me trouble before. CEL didn't come back on for a few days, but now it's on again with just the rich/lean codes.
I've sprayed around the engine bay with starting fluid to check for vacuum leaks to no avail. Tested voltage and resistance on all associated sensors and AMM and all look to be good. PCV doesn't seem to be backed up.
I'm going nuts over here. Can anyone please help?
So I replaced the oxygen sensor. It was fine for a few days then came back on halfway between Atlanta and Charleston. Replaced the ECT and flushed coolant. Came back on almost immediately.
When I was doing this I took the throttle body off. Noticed it was a little wet on the butterfly valve on the downstream side. That turned my attention to the fuel pressure regulator. Replaced that with a unit that hadn't given me trouble before. CEL didn't come back on for a few days, but now it's on again with just the rich/lean codes.
I've sprayed around the engine bay with starting fluid to check for vacuum leaks to no avail. Tested voltage and resistance on all associated sensors and AMM and all look to be good. PCV doesn't seem to be backed up.
I'm going nuts over here. Can anyone please help?
#3
I have a '94 940 Turbo wagon (208k miles). CEL came on about a month ago. Since then I have fiddled with it and gotten 2-3-1/2-2-1/1-1-3 codes in A2.
So I replaced the oxygen sensor. It was fine for a few days then came back on halfway between Atlanta and Charleston. Replaced the ECT and flushed coolant. Came back on almost immediately.
When I was doing this I took the throttle body off. Noticed it was a little wet on the butterfly valve on the downstream side. That turned my attention to the fuel pressure regulator. Replaced that with a unit that hadn't given me trouble before. CEL didn't come back on for a few days, but now it's on again with just the rich/lean codes.
I've sprayed around the engine bay with starting fluid to check for vacuum leaks to no avail. Tested voltage and resistance on all associated sensors and AMM and all look to be good. PCV doesn't seem to be backed up.
I'm going nuts over here. Can anyone please help?
So I replaced the oxygen sensor. It was fine for a few days then came back on halfway between Atlanta and Charleston. Replaced the ECT and flushed coolant. Came back on almost immediately.
When I was doing this I took the throttle body off. Noticed it was a little wet on the butterfly valve on the downstream side. That turned my attention to the fuel pressure regulator. Replaced that with a unit that hadn't given me trouble before. CEL didn't come back on for a few days, but now it's on again with just the rich/lean codes.
I've sprayed around the engine bay with starting fluid to check for vacuum leaks to no avail. Tested voltage and resistance on all associated sensors and AMM and all look to be good. PCV doesn't seem to be backed up.
I'm going nuts over here. Can anyone please help?
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Ethan Morrisson
Engine & Internal
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12-21-2012 04:31 AM