High to Low Side Open - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 02-16-2013, 09:02 PM Thread Starter
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High to Low Side Open

Having a High to Low Side Open code thrown. Seems to do it mostly when the engine is sort of cool and im going up hills or if I get on it a little. Whats some things that could cause this? its just on one of the cylinders, which happens to be on the same side I replaced a couple glowplugs on. The code started getting thrown after I changed the glowplugs so I'm thinking something with the harness under the valve cover? Does that make sense?

99 f350, 4inch exhaust, 6637 filter, tuner.
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