Originally Posted by
dogbone
Hope this helps anyone with a similar problem...
Had a daunting intermittent issue where the idle on my (late 1996 build) 60 Series would "stutter" from the normal 700 rpm up to 1000 rpm the normal high idle speed. I would not characterize this as a galloping idle, which is a different issue that I also experienced in a different life. With the current problem I would also experience a periodic uncommanded high idle for several minutes (which became interesting at stop lights or backing into a parking space). A local Detroit service center focussed on the engine EEC by swapping in a new EEC to see if the problem would go away. Of course, the intermittent problem never occurred during this trouble-shooting effort. The high idle system is apparently quite complex, passing through a number of inter-related components and circuitry.
Since I had a trip planned for Nashville last month, I scheduled service with Prevost in Goodlettesville, TN to work this issue. Fortunately, as they were moving the coach into the shop, the gremlin struck. After a laptop analysis and some brainstorming by the old-timer's they discovered the fast idle relay (R22) had a bad ground. They cut wire 953 from terminal 87A and wired it directly to a chassis ground stud. Problem FIXED!
Kudos to the guys at Prevost.
dogbone,
Did the erratic idle occur only when the engine was cold?
Mine misses while it is first warming up on a cold day. If I let it idle at 700 rpm it doesn't miss at all, but if I use the high idle feature it misses.
Tuga & Karen Gaidry
2012 Honda Pilot