so, how bad will a vacuum leak f'up the idle quality and driveablilty of M/S 50/2 engined cars? the reason I ask is I have a vaccum leak on my reccently finished swap (apparently I nicked one of the intake gaskets during install; I spray some solvent around #1 it sucks right in and she smooths out) and I'm curious as to how much of the driveability issues would be attributed to this as I have almost zero throttle response untill I'm at half throttle/over 2500 then she picks up and revs like a banshee (8.5# flywheel/S52 cams/540HFM/TRM chip) and the CEL light goes out. Basically would this (obviously more than likely) be my issue or should I be prepared to look around else where once I have the vacuum issue resolved (as stated CEL goes out when revs pick up so I don't think I have any other codes; but I am picking up a peake tool this week)?
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Greg 1987 325is (fairly far from stock at this point)
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vacuum leak = lean = BOOM. -
Not really...Originally posted by gobuffs View Post
The vacuum leak is probably causing all of his drivability issues, but adaptation is adding extra fuel, and as manifold vacuum goes down, flow through the leak will go down, so it's probably actually rich at high loads where there is actually danger of the motor going boom.
Just take it easy when you drive it and get it fixed ASAP.Comment
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alright sounds like this is at least the majority of my problems; basically I just fired up the engine (fresh rebuild) and it has run for maybe 10-15min aggregate; as it was idling so poorly (rough idle and the occasional back fire through the intake) and would die once I took it off idle (the throttle response issue I described) that I didn't want to hurt anything so I trouble shot what I could and shut it down. I was just suprised how much a vacuum leak would completely kill the drivability of the car as it was hard to drive the car out of the garage (stalled it a bunch).Greg 1987 325is (fairly far from stock at this point)
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