It has had the compression test done, the heads were off abot 2k ago
to check them (same time o2s were replaced) and it got its third
plenum gasket then. The gasket looked fine, but I decided to replace
it anyway. I have capped off every vacuum port and it will still
throw fits. I have back probed every sensor possible with an analog
volt meter, a dvm and an oscilliscope. Still no help from any of the
readings. I have checked the resistance of every circuit in the
wiring harness with no luck there either. I am out of ideas and hope
the obd-II software can help me out some.
WiLieR
On 2/21/08, Bernd D. Ratsch <bernd@dodgetrucks.org> wrote:
>
> Have you done a running compression check or cylinder leak-down test yet?
> At 157K miles...i'd be checking for either a leaking plenum and/or cracked
> head (very common on these engines at higher mileage).
>
> - Bernd
>
> -----Original Message-----
> From: WiLieR [mailto:waffle787@gmail.com]
> Sent: Thursday, February 21, 2008 9:07 PM
> To: dakota-truck@dakota-truck.net
> Subject: DML: OBD-II Software
>
>
> I'm in the market for some OBD-II software to use on my laptop. I
> want it to be able to log sensor readings (as many as possible) and
> maybe create graphs of these readings. I have an intermittent stumble
> on my dak that I can't track down for the life of me. It has been a
> four year on going project to track down the source but I haven't been
> able to find it. I have replaced every sensor on the thing and I
> still get a random stumble. If it was carbed I would say it is
> flooding out because it stumbles and runs like crap, might backfire a
> couple of time either through the exhaust or the intake but if I floor
> it and run it through first gear (always does it at idle while in
> gear) to "blow it out" then it does just fine. I have checked the
> timing and it is spot on. I have monitored the fuel pressure while it
> is running normal and while stumbling; it always stays at a constant
> 49-50 psi. I don't have any vacuum leaks and my trans is acting
> normal.
>
> So my final resort is to buy some OBD-II software and log the sensor
> readings hoping to interpret the sensor data to determine exactly what
> is going on. Before it is asked, I have done a tune up, the O2
> sensors are only 2,000 miles old (I know Bernd would have asked about
> them ;D ) and I have checked and double checked every ground, tried a
> different pcm out of a known normal running dak and even swapped
> distributors thinking maybe the bushings in it were going bad. The
> dak is a 96 3.9 auto with 157k on the clock.
>
> WiLieR
>
>
>
>
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