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Yes, the firewall mounted voltage regulator still does the regulating. The only item I don't get with the '92 ECM in my 91.5 is the overdrive shift. The water in fuel light seems to work, voltage regulating, grid heaters and cruise control all work. I did borrow a '94 diesel ECM to try out -...

Ofelas, I lost my ECM about a year and a half ago on my 91.5 auto D250. I used a momentary toggle to the grid relays, and a lit toggle taped to the gearshift handle for overdrive. Cruise control was dead, and no water in fuel light. This was all fine except I really wanted cruise control...

As PToombs recommended, pour a bucket of cold water on the injection pump when it's hot - it will probably start right up. The heat increases the clearances in the pump body and allows it to leak too much. The water shrinks down the housing and brings the pressure back up. My dad had a couple...

I have a 91.5 D250 in Ontario. Just had the emission inspection done a couple months ago. Because they can't plug in their computer, it's a visual inspection. Start the truck, let it idle for 15 minutes to see if it smokes. Mine gives a good puff on start but is clean after. The mechanic wasn't...

Back at Christmas, I found my computer had partially failed on my 91.5 D250 auto. No grid heaters, no overdrive and no cruise control. Speedometer worked, and I don't know if the computer controls anything else, but nothing else had failed. I put in bypass switches for the O/D and grid heaters...

Check the electical The O/D requires several switches to be made before it will upshift. Not sure if I'll get them all but: Switch on the dash for turning it off, temp switch for when the engine is too cold, temp switch for transmission too hot (I think, can't quite remember), and the TPS. And the...