88R686st Posted December 22, 2009 Share Posted December 22, 2009 my 80 mack with a 237 has a wiered idle problem. start it up and idles fine after 5 minutes or so it will jump up about 200 rpm's and idle to high. if i wack the throtle it will come back down and then it will eventually high idle again. injection pump was done 2 years ago. any thoughts? Quote 88 R686st 80 R685 93 Ford L8000 02 Ford F550xl 06 Ford F550xlt 06 Ford F350 lariat Link to comment Share on other sites More sharing options...
fjh Posted December 22, 2009 Share Posted December 22, 2009 my 80 mack with a 237 has a wiered idle problem. start it up and idles fine after 5 minutes or so it will jump up about 200 rpm's and idle to high. if i wack the throtle it will come back down and then it will eventually high idle again. injection pump was done 2 years ago. any thoughts?My guess would be the throtle lever is broken try replacing that first! Quote Link to comment Share on other sites More sharing options...
mackkid Posted December 29, 2009 Share Posted December 29, 2009 my 80 mack with a 237 has a wiered idle problem. start it up and idles fine after 5 minutes or so it will jump up about 200 rpm's and idle to high. if i wack the throtle it will come back down and then it will eventually high idle again. injection pump was done 2 years ago. any thoughts?I Be guessing problem with governer Quote Link to comment Share on other sites More sharing options...
other dog Posted December 29, 2009 Share Posted December 29, 2009 could be as simple as a weak spring. the throttle spring on the '77 I drove worked backwards from what you would think-if it broke, which mine did twice, it would run wide open. I put a rubber strap on it along with the spring, just for extra "insurance" in case the spring decided to break again in a bad spot, like coming down the mountain with a load of chips. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment Share on other sites More sharing options...
theakerstwo Posted December 30, 2009 Share Posted December 30, 2009 Just a quick tought here but if it has air ride cab and no free travel in the throdle linkage it could be gaining the movement of the air bag airing up and mashing down on your gas. Quote glenn akers Link to comment Share on other sites More sharing options...
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