Yeah, that brings back some memories Looks like you may have a couple of future mechanics in the family too, anyway your sure to have help on future projects Nice build too, thanks for sharing!

 

So I finally got time to get under the truck. I pulled the speed sensor and took a look at it and there were not obvious problems. How tough is it to find the other end of that sensor and check the wave it is producing? Does someone make a "cheap" scope these days?

Peter

 

OK, so we finally tracked down the problem. It was in limp mode.

Althoug the speed sensor may have been partially to blame, the primary culprit was the fact that my ECM was for an automatic and as part of the converison the PCM was replaced with an ATS stand alone controller. The ECM just wasn't happy that all those tranny parts weren't there.

Bob Wagner at Smarty sent me a new ECM file (something Dodge couldn't even do) for a manual version of the engine and that solved all my problems.

I am down to 2 trouble codes now (from 8), one related to the fuel sensor which isn't there and one related to the lift pump that isn't there either. I may spend some time figuring out how to hook these to the appropriate inputs on the ECM to get rid of these as well.

In addition, ATS pointed out an interesting fact. When converting to a truck that is older or doesn't have ABS, you often end up getting your speed input from the tailshaft of the tranny or transfer case instead of the rear axel as on the original Dodge truck. This means it turns 3 to 4 times slower than the original. You can use the ATS stand alone controller (really a PCS) to take the existing input and program a new output at the approrpriate pulse rate. This affects least the cruise control and I'm not sure what else. I haven't tried it yet and will post here what I find out.

Peter

 

Maybe its a long shot, but you miss 100% of the shots you dont take. Try recalibrating your TPS by disconecting both neg. batt terminals for at least 30 min. Reconect cables and turn key to run, but do not start. Slowley and smothly depress accellator pedal to floor, then slowley and smothely back to idle position.

Hope it helps.