M42 w/ 1500-2500RPM stumble

[wastedincome]

Ok the M42 in my Vert' has developed a stumble-studder between 1500-2500 RPM. BUT ONLY onced warmed up. If the motor is cold its seems ok.
Is there some sort of "cold start injector" or something that isn't shutting of when warm??

[wastedincome]

Anybody??????????????????

No one knows these M42's???

[BavarianBimmer]

Check all vaccuum hoses first,

had also that problem on a cold engine => loose vaccuum hose

[asubimmer]

yeah check those hoses. Mine sarted ideling like crap and it turns out that someone had tapped my vaccum hoses back together...haha..no wonder they crapped out on me.

[Bimmerfanatik]

Mark, we'll go through the car when you come up (whenever that is) and figure out what's going on. There has to be a reason for this.

I suggested perhaps the cat may be clogged - any takers?

[asubimmer]

mine was clogged before i bought the car..then it got gutted for it crimes...then i put a pipe through it...I don't like cats

the car has no power w/ a clogged cat

[Bimmerfanatik]

mine was clogged before i bought the car..then it got gutted for it crimes...then i put a pipe through it...I don't like cats

the car has no power w/ a clogged cat

ok, so it's not at low rpm, its just straight through?

[asubimmer]

i don't know all the details on it but i'll ask nick for more details this weekend. He gutted the cat before i got the car. He just said that he was driving one day and the engine got all choked up and then after a moment of no power (he didn't say if it was up top or in the lows or all...haha) and then bang...black smoke cloud...power again and no more cat. It blew out! Gutted cats sound like crap so i welded a pipe through it.

[KangamangusDriver]

Vacum lines, check the one on the bottom of the air intake boot.

I had the same problem with my M42

[royalflush313]

Ok the M42 in my Vert' has developed a stumble-studder between 1500-2500 RPM. BUT ONLY onced warmed up. If the motor is cold its seems ok.
Is there some sort of "cold start injector" or something that isn't shutting of when warm??

I had the same problem with my M42.
The problem was a fairly small crack in one of the vacuum lines. I was told that the heat opens up crack making the problem more apparent.

G'luck fixing it.

[wastedincome]

Thanks guys
Now I gotta make some time to check it out