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Old 04-01-2013, 07:38 AM   #6
Focus Jr. Enthusiast
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Location: Richmond, VA
What I Drive: 2000, Cloud 9 ZTS

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Originally Posted by whynotthinkwhynot View Post
Um.. you only have one vac line controlled by a solenoid, and that's the purge line from the EVAP system. All vacuum lines should be operating all the time. Have you inspected the lines?

Do not be afraid, there are not many- like 4-5. Follow the VECI diagram under the hood. You might also have a problem with your check valve on the power brake booster or the booster itself.

I'd check the usual vacuum issue suspect: the PCV vacuum line. Of course it's important to check all of the lines for damage, but this one is the one that seems to cause the most problems.

Also, an engine that is running on like 2 cyls will have a hard brake pedal because it isn't producing vacuum like a normal engine, so that issue could be another symptom of your engine issue instead of a cause.
Its running on all four cylinders now. I have traced the vacuum lines and used intake cleaner spray to verify that there are not any leaks. The brake booster or valve could be culprit still. But after it warms a little they operate fine. Or when I rev the motor over 2k in neutral within a minute of starting it cold in the morning. My thoughts are that it could be the temp sensor. When it runs open loop it uses this to calculate the fuel mix. Also I dont know when the O2 sensor was changed if ever. So that is on the list of things to do next as well. But the O2 sensor would only affect closed loop driving.
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