Bogs after starting
04-01-2012, 07:36 PM
#1
Bogs after starting 95 Formula M6
Brand new NGK Iridium Plugs, Duralast wireset, ran fuel injector cleaner, cleaned MAF and TBI, K&N Filter, new fuel filter, fresh oil and oil filter, Slowmaster 40 exhaust.
Problem: When I fire it up, it sputters and backfires a bit and the idle jumps around a bit, can drop as low as 500 rpm. After that smooths out, I can put it into gear and go and it'll bog and shudder, rpm won't go above 1100 or so for a few seconds. After that, it runs perfectly fine as long as I don't turn it off and back on.
Ideas?
Brand new NGK Iridium Plugs, Duralast wireset, ran fuel injector cleaner, cleaned MAF and TBI, K&N Filter, new fuel filter, fresh oil and oil filter, Slowmaster 40 exhaust.
Problem: When I fire it up, it sputters and backfires a bit and the idle jumps around a bit, can drop as low as 500 rpm. After that smooths out, I can put it into gear and go and it'll bog and shudder, rpm won't go above 1100 or so for a few seconds. After that, it runs perfectly fine as long as I don't turn it off and back on.
Ideas?
04-02-2012, 07:01 AM
#5
Doesn't really have to warm that much, it seems. After that initial bit of trouble is gone, I don't have any more until I turn it off and on. From idling at a stop light, to letting off the clutch w/o giving it any gas and skip shifting, to punching it and doing 145 in 5th the other day, it's as smooth as a shot of really good whiskey.
I only sprayed the MAF. I was tentative about touching the wires b/c I figured fibers could get stuck on them or, being clumsy, I'd twitch and break one or something.
I only sprayed the MAF. I was tentative about touching the wires b/c I figured fibers could get stuck on them or, being clumsy, I'd twitch and break one or something.
04-02-2012, 06:34 PM
#6
Alright, turns out that a major exhaust leak has developed right before the cat. Very loud backfiring in the exhaust pipe. MAF is fine. Ran it w/ the maf disconnected and it did the exact same thing in speed density. Seems that the only thing that helps is to give it a lil gas as I'm starting it, about enough to get it up to 2500 rpm or so. Then, it runs fine after. So I'm thinking the problem with it bogging may be from the exhaust system not having enough backpressure until I push some gas through it.
