1971 bus missing on #1 at low rpm

Moderators: Sluggo, Amskeptic

Post Reply
User avatar
whc03grady
IAC Addict!
Location: Livingston Montana
Contact:
Status: Offline

1971 bus missing on #1 at low rpm

Post by whc03grady » Tue Apr 06, 2010 10:03 am

Not mine, but good folks we know. They're in Mexico.
Type I with dual Kadrons and a 009:
http://bodeswell.org/2010/04/06/3917/#comments
Ludwig--1974 Westfalia, 2.0L (GD035193), Solex 34PDSIT-2/3 carburetors.
Gertie--1971 Squareback, 1600cc with Bosch D-Jetronic fuel injection from a '72 (E brain).
Read about their adventures:
http://www.ludwigandgertie.blogspot.com

User avatar
Amskeptic
IAC "Help Desk"
IAC "Help Desk"
Status: Offline

Re: 1971 bus missing on #1 at low rpm

Post by Amskeptic » Wed Apr 07, 2010 10:01 am

whc03grady wrote:Not mine, but good folks we know. They're in Mexico.
Type I with dual Kadrons and a 009:
http://bodeswell.org/2010/04/06/3917/#comments
Very possibly you have an intake manifold/port leak at cylinder #1. This lean condition causes a misfire at idle but cleans up at higher rpm. You can adjust the carbs and be satisfied with synchronization between banks and still have this issue. Plug color would tip you off. Check for leak with cool engine and a spritz of WD-40, if idle changes, you have a leak. It is not just the gasket. Aftermarket manifolds are famous for warping.

It should be noted that if you have a balance pipe between the front pair (otherwise known as a brake booster circuit) you can also have a lean condition shared by #3 and #1 because intake strokes are scavenging balance pipe air instead of drawing in fresh mixture.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles

User avatar
whc03grady
IAC Addict!
Location: Livingston Montana
Contact:
Status: Offline

Post by whc03grady » Thu Apr 08, 2010 4:58 pm

Thanks for offering that, Colin.
Ludwig--1974 Westfalia, 2.0L (GD035193), Solex 34PDSIT-2/3 carburetors.
Gertie--1971 Squareback, 1600cc with Bosch D-Jetronic fuel injection from a '72 (E brain).
Read about their adventures:
http://www.ludwigandgertie.blogspot.com

Post Reply