Idle issue and i pulled some codes
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Senior User
Joined: Feb 2009
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Idle issue and i pulled some codes
89 F250 351W C6 trans. For the most part the truck runs fine but every now and again when i'm in gear at a stop light it will start idling really rough.
34 EVAP Control system Fault/Voltage higher than closed limit
34
34
41 HEGO (hO2s Sensor Signal out of range/always lean
34
41
this is how the codes came out twice on my code reader, it was 34 34 as hard codes and 34,41,34,41 as continuios memory codes and i checked it twice just to make sure. was wondering if anybody can point me in the right direction to fix these. When i got the truck it didn't have a O2 sensor but i installed one and it doesnt have cats and the smog pump isn't hooked up
34 EVAP Control system Fault/Voltage higher than closed limit
34
34
41 HEGO (hO2s Sensor Signal out of range/always lean
34
41
this is how the codes came out twice on my code reader, it was 34 34 as hard codes and 34,41,34,41 as continuios memory codes and i checked it twice just to make sure. was wondering if anybody can point me in the right direction to fix these. When i got the truck it didn't have a O2 sensor but i installed one and it doesnt have cats and the smog pump isn't hooked up
Senior User
Joined: Jun 2009
Posts: 164
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From: Mt. Clemens Michigan
o2 always lean would lead me to believe that the o2 sensor is either faulty or the wiring could be shorted/open somewhere. i dont think that the evap would make it run rough at idle or not. but sounds like the control valve windings are open if fred is seeing high voltage.
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Okay i reset the computer today found a vac leak on the transmission shift modulator fixed that and fixed a couple vac lines under the hood that were capped off, now the problem is worse then it was before there is one vac line that i couldn't find were it goes, it is one of the red nylon ones going in the direction of the green one that goes to the EGR valve. I checked the codes and only got code number 34 again. It misses really bad when just idling but it doesnt miss when your driving it is is really smooth running from 1000 on. I was wondering if anybody has a picture of the that vac line group that go to the plastic box on the pass side next to the alternator?
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the only thing this truck is missing cat's and it has headers and it is missing the tube that goes to the EGR valve.
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