O2 sensor replacement

muc

"Retired" Association of Marine Technicians...
Joined
Jul 7, 2004
Messages
2,441
I now work the parts/service counter for a big dealer, and.
It never fails to amaze me that people want to install parts that rarely go bad BUT THEY DON"T DO MAINTANECE. I've lost count on how many boats show up and the customer tells me they have replaced the O2 sensors, IAC, MAP and etc.
I tell them $200 for diagnostics and we will call with results.
I feel so bad charging people the $200 diag. (idiot tax) that I started trying to start with the question "are you keeping up with the recommended maintenance?". But this just usually leads to the customer saying "I do all my own maintenance, just fix my problem.
Next the tech comes to the counter with one spark plug in his hand. There is paint on the plug, so 10 years old and never been replaced. We do the normal service and 9 out of 10 times that fixes it.
Your spark plugs are 5 years over due.
Your antifreeze is 6 years over due.
Your exhaust manifold anodes are 10 years over due.
I would start with plugs and manifold anodes. You can use a mirror and flashlight to see some of the inside of the exhaust manifold to check the condition.
Someone 6' 1" 225 lbs should have no issues doing this.
This is an aluminum block, heads and manifolds engine. So I sure wouldn't let a high school kid do this job, way to easy to strip some VERY expensive threads. Especially since the plugs and anode bolts have been in there way too long.
Volvo offers a free download of their DIY maintenance manual. It has some pretty good advice for working on these engines.
@Fun Times gave you the link, here it is again.

It would be normal for a catalytic engine to run a manifold hot if there is excessive unburnt gas in the exhaust.
 
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