Join Date: Sep 1999
Location: San Diego, CA
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Re: MPI problems again???
Here are a couple of things to think about:
* There are two power wires. One is switched and the other constant. Are you sure you disconnected the constant power?
* If the constant wire has been interuppted for more than a few minutes, the computer will lose the memory of what it learned while running. It should start over like it did the first time you started it. Even when I have disconnected the power (both wires) mine seems to run better than it did the first time it started up.
* The high RPMs are definitely programmed for the first minute or so, but I don't remember mine having higher rpms during the computer's 'learning period'.
* How does it run? Is it missing at any RPMs, or is it smooth and strong through the whole power band?
* If you are experiencing any performance loss at higher or lower RPMs it could be the gap on the crank sensor. The first one I got didn't have the paper button. I set it at the recommended gap and it wouldn't start. Hesco recommended increasing the gap to something like .070". It started, but missed at higher RPMs. I decreased the gap to around .050" and it is perfect. The crank sensor is extremely sensitive. You may play around with that to see if it is the problem.
258 4.0 Head/MPI,NV4500,D300,4.10's,HS9500