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Testing vacuum pump on 85-89 cruise control ? 200 1988

posted by  mike chase on  Sat Jun 25 16:48 CST 2005
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last visit: Fri Mar 12 05:48 CST 2010
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Bob & rhaire,

Thanks for the help. I think I am getting on the right track now.

I'm trouble shooting and was working from a diagram in the Haynes. Now I see that it doesn't correspond to my '88. I just checked the Bentley and got a different diagram for 1986 to 1989. I put up both diagrams on http://mikechaseleadership.com/Cruise.htm.

That two-part vacuum servo valve housing above and behind the engine head has three wires running to it. I assumed that it created vacuum because it had three wires running to it (motor or something). A short vacuum hose was missing when I got the car. I did put in a T so that there would be vacuum continuity between the nipple that says "Vacuum" on the smaller black canister (has three wires running to it from the control unit) and the nipple on the larger cannister (which seems to just be a small plastic air tank) and the intake manifold. Did you put the check valve in that long hose running from the two-part vacuum serve vale housing and intake manifold?

If yours is working, how many inches of vacuum do you have (indirect way of asking how much vacuum is needed)?

I can hear air being released when I step on the brake. Does this mean that the vacuum line is holding vacuum and that my hose system has continuity (no leaks)?

Mike





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