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Old 11-10-2008, 03:44 PM
Ramp Rat
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Question RPM Surge ?????

My 98 Jimmy with a 4.3L and automatic will show a change in cruse RPM of 200 to 300 rpm. The tach shows an increase of 200 rpm for about 1 second and then returns to its original reading. You can feel the change but only slightly. This happens about every 10 to 15 seconds until you get about 30 to 50 miles down the road. Im assuming that everything has warmed up by then so it stops.
There are no shown or stored trouble codes in the computer. Any ideas?
Thanks, Steve.
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Old 02-23-2009, 04:53 PM
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eatonrapidsdonnie is on a distinguished road

I had a simular problem with my 96 silverado.. I would come to a stop but my rpm would go from 600 to 1000 then back about every 5 seconds... I noticed that it would do it when I had my defrost setting on for my front windshield. Since it was the summer time, I checked my air conditing level and it was lower then normal. I filled it back up and them that stop and went away. Its been a yr now and mines starting to do it again. I think that I have to charge my ac again {slow leak, maybe you have one also} or maybe its something else?
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