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DS4 IP experts

If you do decide to go the OBD2 path, don't spend time or money by playing with resistors. Just put in the correct OE value resistor and let the computer do the work. Incorrect resistors just fools the computer and makes it think it is doing one thing, when in reality the IP is doing something different. Put another way, with a non-OE value resistor, the only time the mixture is correct is at idle. Once asking for power, the system is out of balance and usually on the rich side. The better way to get different fuel levels is via the power tables in the software. But last I checked, the only way to get different fuel levels is just to change the desired power for a given throttle value.

I was never sold that OBD1 was really any different than OBD2 when it came to the resistors and fueling.
 
Twisted Steel Performance said:
This IP was on a motor that failed, the owner says he thinks it was working when it was removed.

The prom I'm using is a prom quadstar sent me to use for this testing on my stand. I do have the owners prom I'll swap and try to see if that makes a difference.

I could swap a db2 in to prove the motor, but that is a lot of work and doesn't show the owner the motor is right with his IP, so I'll keep working to see if I can get this figured out. I'm sure it's not the PCM as the motor I ran a month ago was perfect with a new IP so it's something with this pump I think... I'll wait till the owner gets back in town to see what he wants to do..
Click to expand...
It’s the IP
 
Big T said:
It’s the IP
Click to expand...
I have a spare that I can send to @Twisted Steel Performance
Try it out and see if it runs with that.
It is the pump that was on my engine when I bought the truck.
It was throwing an advance code. Replaced the advance stepper motor and have not tried it since.
The original stepper motor was froze solid. New one could ratchet in and out with the actuator plunnger.
 
As of yesterday afternoon everything is good, I'll run it a few more times next week and make some fine tuning adjustments and I believe all will be good.
 
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