oldblues

hi
well got on turnpike today and set the cruse and all was well for about 5 mi ,
then it started !

surging up and down about 3-5 mph ????

what is going on here ????

runs fine when cruse is off ?

reset it couple of times and still does it ?

yhank you !

phox_mulder

I'd guess a vacuum problem.

Check under the drivers side battery, then trace the lines from there looking for holes, loose "T"s, cracks, etc.


phox

oldblues

hi
i dont think it is a vac prob as i put a gage on the vac line at cowl and got 25 in at idel then turned off engine and had still 23 in after 10 min .?

but i just had an idea maby i should drive it with the vac gage hooked up ?

what else could be the prob , is there a speed sensor and how do i test it ?

Stamey

It's your cruise control actuator, under the left battery. About 45-50 bucks from the dealer. When mine went bad it would surge as much as 15mph randomly, but most of the time after I hit a bump in the road.

Chris

oldblues

yes it is under the left bat .