Quote:
Originally Posted by lorainfurniture
Symptoms: Runs like a dog, no power.
I suspected a vacuum leak, and I was right. At idle, I am only getting about 14-15hg of vacuum. Normal from what I searched is 18-22hg.
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If it idles like a dog I might agree that vacuum is an issue. However, if it always runs like a dog, there's something else.
Think about it. When you hit the gas, vaccum disappears and what the engine needs is fuel and spark. Vacuum leaks will be irrelevant as the butterfly valve's fully open and the engine's gulping in great globs of air.
Smooth idling is one of the most difficult situations for the management system to handle. Once you open it up, the equation becomes simpler, albeit not trivial for optimum conditions: fuel, air (which the pistons are sucking in like hell) and spark.
I've been having vacuum issues on my old M104 KE Jetronic and it's only at idle speed that problems manifest themselves.
There is something worth considering though. If you've adjusted fuel delivery duty cycle with vacuum leaks, the adjustment will be out and that could affect richness (or otherwise) under power.
That's my 2c worth.
Bon courage.
RayH