I have a 1992 Madza B2200 Extended Cab 5 speed standard pu. I am having computer problems which I believe could be fuel related. The original computer starts the truck without a hitch, however it runs really bad...Bought a good used computer but it wont' start the truck. I have to start the truck with the original computer, let it run for a few minutes then switch to the used computer. The truck runs great with the used computer it just won't start it.....

any ideas on what the prob could be.....really need your help...

 

Computer (ECU, ECM, Black box, whatever you want to call it) problems are common in these trucks. Go here for an explanation: http://www.avproecm.com/mazda.htm. FWIW, if you decide to have your ECM rebuilt, I highly recommend AvPro. I sent the bad ECM for my '93 B2600 to a cheap rebuilder found on eBay. He returned it after a week as 'not rebuildable.' Got on the net and found another 'rebuilt'. It failed in less than a month. Finally went to AvPro, which I should have done in the first place. They rebuilt the original "unrebuildable" one the same day they got it and returned to me immediately. It has worked flawlessly.

 

I have a 1992 B2600i SE Cab Plus with only 54800 miles on it. Three weeks ago, as I was driving, it just died. I was able to restart it, but with, barely enough power to get home. Back in my yard, it would start, but die as soon as you touched the gas. Eventually it wouldn’t even start. I changed the firewall mounted gas filter. Nothing. Following the shop manual, I then changed the Fuel Pressure Regulator. Nothing. Suspecting the fuel pump, I borrowed a fuel pressure gauge and, using the underhood jumper plug, I checked fuel pressure at the filter outlet. The book calls for 60 to 80 lbs. Mine went to 70 lbs with no bleed down after 5 minutes. I still suspected the fuel pump, but went internet hunting. On this forum I found out about AvPro. I emailed them, and then pulled my ECM and sent it to them. When I got it back, I installed it and hit the swtch. NOTHING!!! Then I remembered that I had removed the negative cable from the battery. Hooked it back up and twisted the key. MY TRUCK RUNS!!!! She fired up like it had just come down the assemble line.
Filter cvost was $40. FPR cost was $130 (my brother knows the manager of a Car Quest. The FPR lists at $330.) AvPro got $160 to overhaul the ECM and send it back. I highly recommend them.