1993 Econoline 4.9 Can a manifold gasket cause a pretty bad miss?
Country: United StatesMake: Ford
Hi, I’m Chris. Welcome and thanks for asking your question!
A faulty intake manifold gasket can cause a misfire. A faulty exhaust manifold gasket would have to be pretty much gone and not just barely leaking to cause a misfire, from a lack of back pressure.
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I just had the van in the shop yesterday to check for the miss. The miss does not occur when the vehicle is cold. They smoke checked it at cold idle and at warm idle. At cold idle there were no present vacuum leaks. At warm idle they reported to me that there was a pretty noticeable leak at the manifold gasket.
Which manifold was leaking?
I have never heard of a smoke test for vacuum purposes with an engine running, this would just suck all the smoke in and spit it out the tailpipe.