UPDATE - dosed it with Techron - ran the car 100 miles today (4-12) - using same DME as when problem originally surfaced
- no more misfire - fingers crossed
maybe just a sticky injector
it's been a year since i got my 3.2 conversion running, much thanks to many related threads here - and it was quite delightfull once the initial issues were solved
now i have a new misfire problem that recently surfaced
- it did not do this for the first 1500 miles or so - it would previously pull like a train in 5th from 1500 rpm with gentle throttle input and never required shiftdown even on relatively steep grades- it was like having an automatic trans
now the thing "bucks" or misfires under low-rpm load in higher gears at mid-to-deep throttle - e.g. under 2200, 4th-5th, especially pulling up an incline - if i downshift it is OK
and it occasionally "hiccups" on an uphilll pull even in lower gears at higher rpm (i.e. 3000) -
almost as if there is a momentary total electrical disconnect, like maybe a loose connector somewhere - but i've checked all the connections & found no problems
fwiw - it recently got a new cap, rotor & plugs after getting very wet during an August deluge and developing a really bad misfire (
http://forums.pelicanparts.com/porsche-911-technical-forum/714211-misfire-after-storm.html), - it ran perfectly after that fix
until now - as described above
the still-oem wires & plug ends test OK per spec & show no cracks or nightime arcing
- i have 4 good DME's and have swapped one just to rule that out; also has new pump & filter, etc
and yes i have the Test Plan and have been thru all that stuff (search my other 3.2 posts)
here is a relevant thread:
http://forums.pelicanparts.com/porsche-911-technical-forum/719543-3-2-engine-jerking.html
?? any good ideas that are speciific to such a misfire??
? has it actually happened to you & what solved it?
TIA