Hi’ya!
My M has developed a very slight misfire at cold starts, which has gotten a little worse this year. It goes away when the secondary air pump / ”smogpump” shuts down - after I’d say 30sec - then it runs perfectly.
I’ve checked compression, all coils & plugs are all new.
Any guess? Seems to be related to the air-pump, IMHO.
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Slight misfire, air pump?
- Argenta
- Senior Member
- Posts: 1051
- Joined: Sat Feb 07, 2015 7:49 pm
- Mr Tidy
- Legend
- Posts: 23809
- Joined: Wed Jul 02, 2014 12:18 pm
- Location: North West Surrey
Slight misfire, air pump?
My MC does this as well.
I recently read about E46s having the same issue on m3cutters and the consensus seemed to be either the secondary air pump or possibly a failed throttle position sensor.
Link here:- https://forums.m3cutters.co.uk/threads/ ... st-3446215
I recently read about E46s having the same issue on m3cutters and the consensus seemed to be either the secondary air pump or possibly a failed throttle position sensor.
Link here:- https://forums.m3cutters.co.uk/threads/ ... st-3446215
Coupes because stunning!
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black
- Argenta
- Senior Member
- Posts: 1051
- Joined: Sat Feb 07, 2015 7:49 pm
Slight misfire, air pump?
Thanx, ok it doesn’t ”kangaroo” actually I haven’t noticed anything weird driving it. Its on first 30sec of tickover you can feel the engine rumble about, which stops when the pump stops.
- Mr Tidy
- Legend
- Posts: 23809
- Joined: Wed Jul 02, 2014 12:18 pm
- Location: North West Surrey
Slight misfire, air pump?
I think "kangaroo" might not have been the best description! I'd describe it more as stuttering.
Coupes because stunning!
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black
Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black