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Old 01-08-2012, 08:13 PM
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W126 ignition advance vacuum?

Or so I think it is. Still learning here, so bare with me. The flat thing with the various plugs on the driver side near ABS. BOSCH part. I dont think its the actual coil, is it? Well it has a vacuum line going to it. There is never a vacuum on that line, warm (110c) or cold (0c). Should there be? Or is vacuum advance at the distributor. If the thing even has vacuum advance...

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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Old 01-09-2012, 09:57 AM
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A 1991 560 engine has crank fired ignition system & vacuum goes to the EZL for reference load signal.
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Old 01-09-2012, 11:59 AM
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Sorta figured some of that out by looking at the vacuum diagrams. But from what it appears, there should be vacuum at the module, and I have none. Sounds like and issue, right?
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Old 01-11-2012, 10:20 AM
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Should be a vacuum line from the EZL to the intake manifold at the left front of the fuel dist. With out it, the car will run good but get bad gas mileage.

Paul
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Old 01-11-2012, 12:00 PM
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Quote:
Originally Posted by pmckechnie View Post
Should be a vacuum line from the EZL to the intake manifold at the left front of the fuel dist. With out it, the car will run good but get bad gas mileage.

Paul
Well, the car does run great. I got the lambda nailed down perfect. Never seen a car with cleaner plugs. But yes, my milage sucks. Might also have a stuck open t-stat based on temps never going over 80 degrees.

I will look at it again today. I figured there should be vacuum. So I even let the car warm up til the high speeds kicked in (I have no viscus fan) and still no vacuum. Did so incase it was temperature related.

I traced the EZL line and it went under the intake. Many lines seem to go there. I will probably have to adjust lambda again if I figure this out.

Thanks much.

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