I have a 1986 Cutlass Ci era With a 2.5 Engine.Wat can be the cause for Engine ray sing up and down on RPM.?

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I have a 1986 Cutlass Ci era With a 2.5 Engine.Wat can be the cause for Engine ray sing up and down on RPM.?

2007-07-15 09:29:32 · 4 answers · asked by Filomena 1 in Cars & Transportation ➔ Car Makes ➔ GMC

4 answers

A very large vacuum leak or an IAC motor that is stuck retracted. These were known for burning their vacuum hoses and intake manifold gaskets. Check through all of this before replacing the IAC motor. Good luck.

2007-07-16 07:40:04 · answer #1 · answered by Deano 7 · 0⤊ 0⤋

sounds like Vacuum leak idle revs then drops. Lean causes the idle air control to speed up then engine control catches the idle and slows it down. Idle hunting also can be caused by bad maf sensor.

2007-07-15 16:34:48 · answer #2 · answered by John Paul 7 · 1⤊ 0⤋

bad idle control motor or a vacum leak

2007-07-15 16:32:55 · answer #3 · answered by Mike H 3 · 0⤊ 0⤋

throttle lever or stuck injector if efi

2007-07-15 16:34:33 · answer #4 · answered by triple sec 2 · 0⤊ 0⤋