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Old 02-06-2009, 05:14 PM   #1
87Alpine325es
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Default vacuum diagram 87 325es???

is there one out there? I've searched for board the last few days and keep seem to find one. I need the vacuum diagram for a 86/87 325es. This car has over 200k and the hoses have never been touched, its having idle issues once warm (from 800 to 1500rpm back and forth). i just want to replace them all at once and hopefully nip this problem in the butt.

Thanks,
-Adam
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Old 02-06-2009, 06:58 PM   #2
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You only have one vacuum hose on the car. Thats from the manifold to the fuel pressure regulator.

The only other is a crankcase hose from the valve cover to the throttle body.

Thats it.

Other problem areas that can cause problems are blown intake gaskets, throttle body gasket, even the valve cover gasket can create running issues. The BMW engines are very sensitive to vacuum leaks.
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Old 02-06-2009, 07:36 PM   #3
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and also the vacuum line to the carbon canister. but that's all of the actual vacuum hoses, aside from brake booster/intake elbow.

Otherwise check the press fittings to the intake manifold, grab them and pull, they'll probably pop right out. Smear some black RTV on them and shove them back in, works better than buying new ones
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Old 02-06-2009, 08:12 PM   #4
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Not everything is a hose but there is certianly more than 2-3 vacuum connections that commonly leak

VC breather
"tube of death" (under the intake manifold)
intake boot
ICV connection
Carbon canister
brake booster
FPR

the intake boot is a common source of vacuum leaks. Normally before the throttle plate wouldn't be a big deal (like a carb'd engine) but on a fuel injected car it's unmetered airflow.

at least these aren't like japanese cars, yeesh.. tubes and hoses and wires going everywhere. I hate working on japanese engines!
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Old 02-06-2009, 08:14 PM   #5
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oh yeah, if you have an oscillating idle it could be a dead or dirty idle control valve. you can clean it out with carb cleaner and see if that helps.
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Old 02-07-2009, 10:28 AM   #6
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Thanks for the responses. I'll clean the icv, replace the 2 vac lines, and make sure nothing else is broken or leaking.
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