Re: 2001 350 mag mpi slight misfire
Sorry wasn't very clear, the misfire is irregular, you don't hear or feel it when just reving out of gear. Once underway its not a regular or a complete die out, more of a hesitance, a few times a minute. Unfortuantly I can not say if its there under full load as I'm on a river with a very low speed limit, but it does rev freely and smoothly out of gear, and it there up to 2000 under load.
Just took the IAC out and cleaned it, wouldn't say it was bad, a small amount of carbon on the end and the rest was good, had to remove the throttle body as one of the screew broke removing the IAC, luckily it left enought to thread to get grips on. All cleaned waiting for new throttle body gaskets to arrive.
The 350 mpi has a riser block between the EX mainfold and the elbow, probably 6" hight, so there are 2 sq 4" or so gaskets one at the bottom EX mani to Riser and one at the Top, Riser to Elbow. They took the lot apart and checked the flap vavles at the bottom and then re assembled.
I've double checked the leads and plugs and all look good.
I'll see if the IAC clean does anything, just strange that for Ten years its been faultless and as soon and I let someone else play with it and starts playing up :-(
Anyone know how to test the 4 wire IAC while its out?
Thanks again will keep you posted.
Geoff.