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Old 03-28-2012, 03:27 PM
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Join Date: Jul 2011
Location: Tucson
Posts: 123
Exhaust leak cause idle issues?

I have a 1979 240d that i'm trying to work all the bugs out on. Just curious, could an audible exhaust leak at the manifold/flange cause a rough idle? I know it seems abstract, and I should fix these leaks anyway, but I'm not sure how sensitive diesels are to exhaust back pressure issues.. and I just want to know.

Last edited by sethza; 03-28-2012 at 03:42 PM.
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Old 03-29-2012, 03:54 AM
cho's Avatar
cho cho is offline
diesel power
Join Date: Dec 2011
Location: Europe
Posts: 933


as to my knowledge,none,however do plug the holes
especially under the hood.

w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered
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Old 03-29-2012, 12:17 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
The 240 engine would probably run w/o the manifolds, it would be smokey and noisey, and a health hazard to you.

Would be a good idea to replace the manifold gasket, about $10 for a new one.

X2 that back pressure is not an issue for a Diesel to run. look at all the Ford PowerStrokes, and Dodge Cummins that are running straight pipe.

However, the volicity and volumn of exhaust out the 240 tail pipe, gives it that extra boost you need to get them going.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 03-29-2012, 12:43 PM
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Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
I'd look else where for idle issues. Start with fresh fuel and air filters, valve adjustment, a couple cans of diesel purge, and make sure your idle is set high enough. If that doesn't help you'll want to pursue motor mounts, injector pop pressures and spray patterns, and compression.

'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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