I checked the O2 sensor today (per Chilton's) and it's only putting out
about 120mV regardless of engine speed or how long it's run. So,
according to Chilton's, the PCM is interpreting that as a lean condition
and dumping more fuel to compensate. I'll replace it tomorrow and see
if it fixes it.
As far as the VSS, I'm thinking that the engine is running so rich the
EMC thinks the truck is actually on the road and loaded, which would
explain the fault 15. Any ideas?
Bill Day wrote:
> Wierd, I didnt know an OS(Oxygen Sensor?) could screw with the motor like
> that? I know for certain that mine is bad, has been for a few years now, I
> still drive the truck daily and am certain I get the motor over 4/4.5k when
> I step on it.
>
> Bill Day
> billday@consolidated.net
> http://users.consolidated.net/billday/
>
> A rich man isn't always wealthy, he just has all the love he wants and can
> give..
>
> AIM - BadManD73 (Catch me if you can!)
> '95 Ext Cab 3.9L Mag 4x4 Flame Red
> ----- Original Message -----
> From: "Biff Byrum" <bbyrum9@foothill.net>
> To: <dakota-truck@dakota-truck.net>
> Sent: Tuesday, March 23, 2004 4:24 AM
> Subject: DML: Re: 95 3.9 no power
>
>
>
>>Code 15 is theVSS code. "No vehicle distance(speed) sensor signal detected
>>during road load conditions." However, I had just about the same crap as
>>you have, just last month. It ended up being the 3 month old OS. It had
>>shorted out and was returning a value so rich that the PCM could not
>>compensate. Check both those sensors. Mine is a '95 Sport, 3.9, AX15.
>>----- Original Message -----
>>From: "Tom" <booyang1@hotmail.com>
>>To: <dakota-truck-moderator@bent.twistedbits.net>
>>Sent: Monday, March 22, 2004 5:57 PM
>>Subject: DML: 95 3.9 no power
>>
>>
>>
>>>Hopped in the truck today, and lo and behold there was absolutely no
>>>power. The engine won't rev above 3000 standing still, and it likes to
>>>big down at wide open throttle while driving. While I was parked and in
>>>neutral, the shift light came on and the MIL lit up with code 15. Any
>>>ideas?
>>>
>>> 95 2WD 3.9L
>>>
>>>
>>
>
>
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