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Old 02-19-2012, 08:43 PM
StyxB2500 StyxB2500 is offline
Always fixing something
Join Date: Feb 2012
Posts: 9
Default Chirping on startup - Solved!!

I've seen a few threads on this issue in the past but nothing too definitive on the solution so I'll post my findings.

On startup, my 1998 B2500 was chirping and squealing right as the engine fired up. It would last about a second and quickly disappear. It would squeal the first three or four starts until the engine is warm, then it wouldn't make any noise.

After spending the weekend repairing several issues on the truck (transmission repair) I decided to investigate and found that the problem is NOT coming from the front of the engine. This rules out the pulleys, belts and tensioner. The sound was coming from the back of the engine and was louder on the passenger side of the truck.

The problem turned out to be the starter. For some reason, the return spring is not pulling the starting gear back into the solenoid quickly enough and it's left bouncing around against the flywheel until the vibrations push it back in. I suspect that the starting gear bearings are shot but won't know for sure until I tear into it.

I've replaced the starter ($10 on craigslist - yay!) and haven't hear the chirp since! It's been two days now and she's gone through about a dozen starts and hasn't let out a squeak!
'98 B2500, M5OD-R1, Standard cab, 160k and counting!
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chirping startup, squal, starter noise

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