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1999 sunfire: will engage and disengage..When jumped..normaly…

Customer Question
the starter on my 1999...
the starter on my 1999 sunfire will engage and disengage rapidly if wired to car. When jumped from the battery it performs normaly, any suggestions.
Submitted: 8 years ago.Category: Pontiac
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Answered in 3 minutes by:
6/29/2010
Pontiac Mechanic: 17 years GM tech, GM master tech replied 8 years ago
17 years GM tech
17 years GM tech, GM master tech
Category: Pontiac
Satisfied Customers: 1,918
Experience: 25 years automotive experience, 15 years with Saturn
Verified

hello, it sounds like you need to check the power going to the starter, you may be dropping voltage on the wires feeding the starter.

A rapid engage noise like a machine gun firing is usually the sign of a bad hold in winding in th starter solenoid though.

To check voltage drop, hook a DMM between Batt + and the batt+ wire at the starter and crank the engine, anything above .09V is too high and may cause your problem. Do the same on the purple wire as well.

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Customer reply replied 8 years ago
I have installed starters from the wreckers and today a brand new one same result. should I replace the wire harness leading to the starter. All the starters work properly when jumped.
Pontiac Mechanic: 17 years GM tech, GM master tech replied 8 years ago
as I said, you need to do a voltage drop test on the thick cable and the purple wire at the starter, then go from there
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