When the compressor is called for there is a period of loud chatter, like a motor starter chattering before the coil holds. After that it runs well.
I have not yet taken this apart. It belongs to my neighbor and Maytag is giving her a bit of a run around, so she has asked me to help. It is still under warranty so I am reluctant to open it. I do have a background in applaince repair and industrial/commercial/residential wiring.
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The timing chain area also takes in the alternator and water pump. To isolate the source of the noise, use the old mechanics trick.
Place a 3 foot 1/4 inch brass rod against the flap at the opening of your ear and push until it closes. Place the other end of the rod against various engine components and listen. The noisy problem will conduct the noise up the rod to your ear and you can hear quite precisely where the problem is. Much safer than laying your ear all over a running engine.
You can also loosen the fan belt and run the engine without alternator or water pump (briefly) to see how that affects the problem. Chatter on start makes me think of starter and Bendix gear problems. Sounds like a 2 person diagnostic team to me; one to start the car and one to listen and probe.
Don't know if Subaru Forrester has an engine that has valve interference at piston Top Dead Center. If it is and the timing chain breaks, you are looking at major $$ to recover.
Darn, just sold my '95 neon. I never had to bother with the electronics, it always worked. That da da noise sounds like must come from some relay. Come to think of it, Chrysler makes had a kind of "main relay" called the Auto Shutdown Relay or ASD relay. It's purpose was as a main relay for sending power to necessary things to keep the engine running-like power to the ignition coil, and power to the fuel injectors, and to the fuel pump. This relay is triggered or controlled by the computer.
If you have a relay chattering and it is not a bad relay, then could also be a poor positive battery connection, or even a poor ground too. If that chattering sound is from the starter solenoid (on the starter motor), then you either have a weak battery or a poor connection ... or a bad solenoid.
It has to be referring to the compressor for the air conditioner, but that is a very unusual name for it.
On a '97 318, there will often be a loud chatter when the compressor kicks on that is sometimes misdiagnosed as a failing compressor. In reality, most times it is the tensioner pulley on the belt.
hi, there is a published technical service bulletin about this problem for these vehicles and the tahoes. the compressor sitting so low in the system, gets over-run by the liquid freon banging internally and actually locks up on and off during operation. this is the noise you are hearing. apparently there is a screen kit to install in the low side suction line to prevent this from happening, but GM also states the compressor needs to be replaced and the new compressors from GM at least, already have this modification done. So, i replace them when they come into my bay with the complaint you speak of, and the tensioner for the belt, likely the belt too. but it looks like you already know all about that. hope i could help.