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Mike Kelly
Mike Kelly, Auto Mechanic
Category: Car
Satisfied Customers: 5469
Experience:  17 years experience as a auto mechanic,foreign and domestic.5 years running my own repair business.
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2003 Mazda 6: Dealer just had to replace the Cat converters

Resolved Question:

Have a 2003 Mazda 6, 3.0L. Car has 40000+ miles on it. Dealer just had to replace the Cat converters. Now they say there is a ticking noise in the valve train, like something isn't getting lubricated. Any ideas?
Submitted: 7 years ago.
Category: Car
Expert:  Mike Kelly replied 7 years ago.
Hi,how are you,it sounds like that the oil pump might be getting weak on the car,not pumping enough oil or not pumping it fast enough,hope this helps.
Customer: replied 7 years ago.
The noise is not present until the car is up to temp, wouldn't a weak pump be worse when cold?
Expert:  Mike Kelly replied 7 years ago.
Not always,in most cases yes,but the pump can be operating as it should upon start up and failing when it gets hot.
Customer: replied 7 years ago.
Is there anyway to check this out, other than the oil pressure?
Expert:  Mike Kelly replied 7 years ago.
Not really,well you can of course remove the pump and test it that way,but that is what i am leaning towards is the pump,hope this helps.
Customer: replied 7 years ago.
Dealer says there is plenty of oil pressure & volume, noise only happens coming off idle & up to 1800 RPM, no noise after that. Any other ideas?
Expert:  Mike Kelly replied 7 years ago.
well,then maybe a bad valve or lifter causing your problem.
Customer: replied 7 years ago.
Listened to car today, noise is more like a loose vibrating heat shield type of sound. Sound is louder when car is cold & follows RPM up to 1800 - 2000 then goes away. Sounds like something is rattling around inside rear valve train
Expert:  Mike Kelly replied 7 years ago.

Did the noise happen as soon as the converters were replaced?

Customer: replied 7 years ago.
yes, but the dealer is saying it must be what caused the cats to go
Expert:  Mike Kelly replied 7 years ago.
Yeah,i think it is the other way around,i think that something during installation of the cats,is causing your problem,very hard to fight the dealer though.wish i could be more help.
Customer: replied 7 years ago.
i agree too but i've got no option but to have them look at it
Expert:  Mike Kelly replied 7 years ago.
I think they should be responsible,but they will never admit wrong doing,it really sounds like a bolt was left loose or dropped inside and is reeking havoc.good luck man.
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