GMC Jimmy Engine Codes
I own a 1996 GMC Jimmy. For the past 3 months, I regularly (once every 2 weeks?) get a engine warning light resulting in code 440.
Initially, I was advised maybe it's just a bad batch of fuel or tightness of fuel cap. Obviously after so many repeats, this is not the problem.
So I don't get hosed going to a mechanic right off the bat, what would be the causes of this issue and the methods of diagnoses and possible repairs or replacements required?
I don't notice any coincidingissues with the vehicle and fuel economy has not dropped since the start of the problem (although in the past month, since weather is colder, fuel economy has dropped noticeably!)
Thank you.
Initially, I was advised maybe it's just a bad batch of fuel or tightness of fuel cap. Obviously after so many repeats, this is not the problem.
So I don't get hosed going to a mechanic right off the bat, what would be the causes of this issue and the methods of diagnoses and possible repairs or replacements required?
I don't notice any coincidingissues with the vehicle and fuel economy has not dropped since the start of the problem (although in the past month, since weather is colder, fuel economy has dropped noticeably!)
Thank you.
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A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Possible Solutions, diagnosis can be tricky at times. Here are some things to try:
Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks
Bank 2, sensor 1 is the front pass side.
Bank 1, sensor 2 is the pre-cat (in front of)sensor.
Bank 1, sensor 3 is the rear most or post-cat sensor.
Thanks.
The rear wiper and the 3 way 4x4 switch run of the same power ( this is only my guess). both lost power at the same time.
Where do i start ? thinking im going to try and feed the 4x4 switch with a power or test for continuity.