post #16 of Old 12-03-2012, 10:25 PM Thread Starter
fastener
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Vacuum is too low and is indicative of retarded ignition timing. The MAP is probably telling the ECU that the engine is under a load when it's not, so the ECU adds fuel. Are there any adjustments on the Howell?

Any vacuum leaks? Have you tried spraying throttle body cleaner arond the intake manifold to head to see if there's a leak there?
You are exactly right. The low vacuum is fooling the MAP and in turn the MAP has the ECU dumping fuel.
I borrowed a friends smoke machine and the motor is tight. Couldn't find any leaks anywhere. All vacuum hoses are new. My friend who I borrowed the smoke machine from has his own auto shop. He is going to come over tomorrow and see if he can find something. So far he is stumped with me just giving him info over the phone. I keep thinking I'm going to find something simple (or not) but so far nothing. I'm going to give Howell a call tomorrow too and bounce the info off them.

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post #17 of Old 12-04-2012, 05:52 AM
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In the meantime, twist the distributor a bit more advance and see what the vacuum does.

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post #18 of Old 12-05-2012, 07:12 PM Thread Starter
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In the meantime, twist the distributor a bit more advance and see what the vacuum does.
Finally got some free time again. Tried advancing the timing and the vacuum maxed out at 13". From 12* to about 18* the vacuum stayed at 13" above 18* the vacuum started dropping.
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post #19 of Old 12-05-2012, 07:31 PM
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Something is funky in the "timing" department.

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post #20 of Old 12-05-2012, 07:50 PM Thread Starter
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Something is funky in the "timing" department.
Could this possibly be caused by a bad damper? I noticed some of the rubber bushing material in my damper is coming out.
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post #21 of Old 12-05-2012, 08:21 PM
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Yes that will give a false timing reading.

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post #22 of Old 12-06-2012, 04:33 AM
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Could this possibly be caused by a bad damper? I noticed some of the rubber bushing material in my damper is coming out.
That's a real possibility. Perhaps the outer ring has rotated?

If you own a Renix Jeep, you'll want to check this out.

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