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Old 02-15-2013, 10:34 PM   #21
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 39,042
 

2003 L-Series 3.0L Sedan
Default Re: LW300 Misfiring; P0306; Vaccum Leak?

Some members have reported finding their flexible rubber couplings for the intake manifold damaged resulting in uneven engine running. With many couplers, a vacuum leak can occur easily. I've found mine are made of some sturdy material, perhaps a heat resistant polyurethane or silicone? The quirky German stainless clamps are another issue and any reuse of these clamps and couplers requires care to be sure they're assembled correctly to prevent a vacuum leak.

Members found these couplers expensive from a dealer but maybe they're a standard size that can be found with some Googling.

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