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Old 11-06-2012, 02:30 AM   #1 (permalink)
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Default Replacing 3.0 engine on my 2005 mazda6

I am replacing my engine, after my pre cats killed my last one. I am going to buy headers and I have already bought a new engine. I bought a few sensors (camshaft sensors and crankshaft sensor) I was wondering what other sensors I should buy/replace. The car has over 100k miles on it now. Any help in this matter would be greatly appreciated!
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Old 11-06-2012, 07:56 AM   #2 (permalink)
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have the alternator rebuilt(I made the mistake of installing the headers w/o doing that. big mistake).

replacing the forward O2 sensors on both banks is a good idea as well.
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Old 11-06-2012, 03:08 PM   #3 (permalink)
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Okay, I thought the O2 sensors would probably need replaced...they are probably siezed up anyway lol. But I never would have thought about rebuiling the alternator. How much is that, and who does that kind of thing...just any shop?
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Old 11-06-2012, 04:20 PM   #4 (permalink)
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access to the alternator requires removing the rear exhaust manifold and 2/3s of the header system. it really isn't a fun job to do, and doing it down the road would be no biggie, but the removal process makes it worth doing.

best bet is to ask locals. most electronic motor shops will rebuild them for ~ 100 bucks or so. for an additional tip they will even bump up the power output.
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Old 11-07-2012, 01:30 AM   #5 (permalink)
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Right on, well I'm thinking I might try to do it myself...I like the bragging rights lol. Has anyone tried this before? Is it very difficult? Also, what is your opinion on deleting the front O2 sensors all together? Maybe pushing them further back even?
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Old 11-07-2012, 06:14 AM   #6 (permalink)
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Remember to re-route the EGR valve on the new engine
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Old 11-07-2012, 10:05 AM   #7 (permalink)
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Quote:
Originally Posted by mikeykuk View Post
Right on, well I'm thinking I might try to do it myself...I like the bragging rights lol. Has anyone tried this before? Is it very difficult? Also, what is your opinion on deleting the front O2 sensors all together? Maybe pushing them further back even?
Can't eliminate the front O2s, they control your air/fuel ratio.

it isn't very difficult to rebuild one from what I understand, but I can have a local shop do it for the price of what the parts alone will cost me and they will clean and paint it too.
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Old 11-07-2012, 11:33 AM   #8 (permalink)
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I am glad I asked. I will call some local shops and see what they say. I really appreciate the advise guys. What do you mean "re-route" the EGR valve? I've heard about cutting the tube down, but that's about all I have heard. Also I took my engine out of the top. I know a lot of people are hesitant to do so. And all of the build ups show out the bottom. It was pretty easy, I must say.
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Old 11-07-2012, 12:15 PM   #9 (permalink)
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DIY: EGR Re-Route (Re-routed properly pics page 5))

When and if I remove my engine, it will definitely be out the front or top. No Fing way would do it from the bottom.
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Old 11-07-2012, 11:39 PM   #10 (permalink)
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Yeah, it was way easier to just pull the engine, as oppose to dropping it with the subframe. I'm use to rear wheel drive classic cars, so I figured why not try to use knowledge I already have haha. Anyway, I started taking apart the front end. And I can say...it was pretty damn easy, with the exception of the CV shafts lol. Today I finished pulling everything off of the old engine, cleaned it, then put it on the new engine. I very much looking forward to painting my valve covers!
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