what would cause the cruise control to not hold a consistent speed/ it fluctuates very quickly up and down by 2 mph very annoying...turn it off van runs perfectly...best simularity to it is it feels just like your typical miss in a gasoline engine when it is on at 70 mph. or any speed setting. it has a new idm (injector drive module) it made no difference in problem.
2007-01-14 08:42:30 · 4 answers · asked by sm 1 in Cars & Transportation ➔ Maintenance & Repairs
Probably a vacuam leak or dry speedometer cable.
2007-01-14 08:48:21 · answer #1 · answered by ctlyle43 3 · 0⤊ 0⤋
Check the vacuum lines from the dash pot to the manifold. The dash pot is the vacuum motor device that pulls on the injector pressure regulator, (like a throttle). Might be a vacuum generator motor limit switch.
2007-01-14 08:50:13 · answer #2 · answered by Tinman_2_54 2 · 0⤊ 0⤋
I easily have a 1994 f 350 dually with an identical engine. interstate utilising i'm getting 22 mpg with out pulling a load. entire miles on engine approx. 85000; additionally I easily have a shell over the mattress.
2016-12-16 04:38:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋
vacuum leak in diaphram where it attaches to throttle body
2007-01-14 08:48:49 · answer #4 · answered by toadyboy 4 · 0⤊ 0⤋