weird misfire update

A while back I posted a thread asking for the help of the Big Boy's, due to a misfire problem I couldn't find. Well I wanted to update you guys as to what it was. As a refresher, I was having a high rpm misfire with my 348. It ran prefect at the low rpm's but would misfire big time around 5,000 rpm. I pulled the spark plugs and reindexxed them. The fuel filters were brand new. The MAFS were okay. I looked at the crank position sensors, and both of those were just fine. Checked the sensor at the back of the intake cam. I bought new spark plug wires, changed out the coil packs with different coils from a friends 348. We changed the igniters, and even went as far as to swap out both of the Motronic ecu's. We checked the grounds and everything was fine. The connections for the fuel injectors were checked, as well as all the vacume lines. After all of that I decided to revisit the crank possition sensors, and they both checked out okay again. So I cleaned them up to put them back on. Then started cleaning the female connectors coming from the wiring loom. There is a rubber boot covering the connector. I pulled one back everthing was fine, just dirty, cleaned it and put it back on. Pulled the boot off of the other connector and BINGO!!!!!! The #1 wire on the back of the female connector was busted. I pushed the pin out the back of the connector and recrimped the wire to it. Put everything back together, and PRESTO, my misfire was gone. So kids, when you are checking your electrical connections, be sure to look for broken wires.

>>So kids, when you are checking your electrical connections, be sure to look for broken wires.><<

Fantastic Ernie!!!

Glad you found the problem...on Ferrari's persitance pays off.

excellent work!

I've found this true on the Mondial as well - persistant problems can often be traced to the wiring loom connectors - this is applicable to almost everyone.