I posted this quite awhile back and thought I would update the situation.
I get the occasional cylinder misfire. It can be just #4, or it can be 2,4,6 or multiple misfires. I swapped out the coil the plugs and plug wires. I checked and replaced vacuum hoses and checked everything I could think of to check. I pulled the throttle body and cleaned it and I cleaned the air intake sensor. Nothing seemed to work.
I gave up and took it to the dealer. They replaced a vacuum hose they thought may be soft and closing up. They checked everything out short of pulling the injectors and found no problems. They also did some procedure to clean the valves, but when I picked the van up I got a few blocks away and the CEL came back on with multiple misfires.
Tonight I replaced the speed sensor as that acted up the other day. It had been a problem more than a month ago, but the problem went away. I don't know if this had anything to do with the misfires, but I should know over the next couple of days.
I'm not sure what else there is to check. The mechanic thinks it's something simple like a vacuum leak, but he replaced most of the hoses and this didn't help. He is on vacation for a couple of weeks, so I have to wait to take it back in. I suspect it could be a bad ECU or bad connector. I have had a few mornings where I got a high idle. Performing the adaptive reset corrected the problem.
The van will run perfect for a few days or up to a week. Any other suggestions are welcome.
Steve
636-337-7700
888-797-5994 - order desk
