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I have an 1995 Rover 1380cc SPI with a PerfectPower Piggy Back ECU for programmable Fuel & Ignition. I have been running this setup for a few years. I had a Weber DCOE 45 Throttle Body with two "peak & hold" 332cc Fuel injectors. The engine did about 87 HP at the wheels.

I autocross and wanted more power for this season, so I purchased an Eaton 45 Supercharger from Vmax Scart and installed it with the same 2 fuel injectors mounted in a Mini MPI throttle body down stream of the SC with the injectors wired as they were in the Weber. One injector is managed by the Mems ECU/PerfectPower piggy back and that is responsible for starting the engine and is controlled by the regular Map sensor vacuum take off, which is near the throttle body.

The second injector has its own MAP bi-directional MAP sensor near the input to the SC and is directly managed by the PerfectPower Piggyback . This one is fired as boost increases and works great.

We have had an intermittent starting and problem since day 1, and intermittently continues after 5 weeks of trouble shooting etc.

We run into a situation where the engine runs great if we apply say a propane hose at the throtle body, however it will not start or or run over 90% of the time using the regular fueling system.

We think there is something going on with the Rover ECU such as an injector lockout based on oil pressure or some other sensor or the lack thereof that we are not aware of.

We are at the point now when we turn it over and have Noid lights connected, the Noid lites work for about 5 seconds then stop operating. When we remove the Noid light and connect the injector the car won't start.

Last week the car actually started and ran Friday many times and we thought everything was solved. When the car was left in the garage Friday night the battery was disconnected.

When we went to start it Monday, it wouldn't start and the same condition exists again.

Is there something about the Mems that requires some type of re-boot after a power disconnect?

We did find a loose wire on the oil pressure sender and someone speculated that that could be the problem since maybe Rover programmed the ECU to require oil pressure before the injectors fired. That was corrected and now the Noid lights stay on for about 5 seconds when cranking the engine, but when the noid is removed and injectors reconnected the engine still wont start.

The other questionable status is with the Main relay. We don't understand all the features involved with it to allow the fuel pump to run or injector to fire. Are there more safety checks with the engine management in place that prohibit the injectors from firing??

Any tests or thoughts or pointers would be very helpful and very much appreciated. This is the single plug Mems ECU.

Thanks Very Much,

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