Vacuum hose diagram
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well, I'm probably forgetting something but vacuum has to go to the brake booster via a fatter hose that has a one-way valve on it, it goes through the firewall to the heater/ac control, it goes to the EGR control valve if you have EGR, it goes to the charcoal canister regen valve (if you have one), I can't think of what else...
oh, if you have cruise control, it probably goes to the cruise servo, but not sure, never had a LH2.2 740 with cruise.
740 ignition advance is done electronically in the ICU so no vacuum there... (on a 240, the ICU has a vacuum connection for advance)
I think the pulsair system was only on later models...
if its not a turbo, it obviously doesn't go to the turbo wastegate or boost gauge on the dashboard.
oh, if you have cruise control, it probably goes to the cruise servo, but not sure, never had a LH2.2 740 with cruise.
740 ignition advance is done electronically in the ICU so no vacuum there... (on a 240, the ICU has a vacuum connection for advance)
I think the pulsair system was only on later models...
if its not a turbo, it obviously doesn't go to the turbo wastegate or boost gauge on the dashboard.
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