Mazda Protege This compact model offers an economical solution for the need for a sporty sedan or wagon.

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Old May 16, 2026 | 08:44 AM
  #11  
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Originally Posted by Charlescrown
My concern with those plugs is how badly eroded some of the electrodes are. Some real bad another not which may be caused by detonation. To be honest I have never seen them that badly eroded even after 200,000kms. You really need to get it checked out.
I hear ya. I mentioned above at the end of my lengthy post that perhaps the previous owner encountered the stuck boots and skipped replacing those two plugs. I'll never know. However, I did run my borescope down each cylinder to have a peak. Piston tops looked rather clean (we ran some seafoam through the fuel earlier. There was a bit of carbon on them but we could easily see valve notches, markings on the pistons, and, on #2 & #3 the intake and exhaust valves (articulating borescope). All looked OK. With 2&3 near BDC, the cylinder walls (what I could see), looked typical for a high mileage engine. I did a dry compression test and all were above 150 PSI (some higher). (FSM says 119 psi is the min). Bear in mind the compression test was on a cold engine. It does have 154K so I didn't expect perfection. I'll likely repeat the compression test on a warm engine (dry and wet) but that may have to wait a bit.

I agree that seeing them in this condition was quite, eh...um... unexpected. While horribly eroded, they're not black, or wet or covered in deposits. It's amazing it ran as well as it did. He ran around a bit yesterday and put nearly 40 miles on it with no issues. He's headed out to his gf's this weekend. That's a 150mile roundtrip. I'll likely pull the plugs and redo the comp test when he gets back.
 
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Old May 16, 2026 | 09:05 AM
  #12  
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Originally Posted by Callisto
Saudade is a competent DIY and general auto service mechanic so I am sure he knows things to look for .From the pictures the. Boots boot springs and spark plugs were all just well worm out. If he had an oscilloscope prior to do the ignition service could have verified this and if there was a weak cylinder. But IMHO it was all the parts perhaps even the coils that are in need of replacement and any ignition problems.

Naturally I am going by the few pictures but the thousands of spark plugs I have changed over time
Aw.. now you're making me blush.....

But to your point, I am a DIY'er. While I have some decent hand tools (metric, imperial, and even a few Whitworth) and some "specialized" auto tools (brakes, AC) I am still limited in what I can do. The tools I have, I have amassed over many years and in many cases, bought when a particular job called for it. Even so, as cars get more sophisticated and computerized, so too does the diagnostic equipment. I can diagnose just about any issue on my 1988 Jeep Cherokee with just a multimeter and repair just about anything with basic hand tools (OK maybe not quite anything). My point here is that, at some point, the issue will exceed my ability to correct it or just cost far more than it's worth. At that time, we'll have to decide to send it to a Pro, or give it up. This has happened with a few prior vehicles.
 
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Old May 16, 2026 | 09:19 AM
  #13  
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Originally Posted by Callisto
Funny you and I have sons that are not as service savvy working on vehicles.. LOL
Yeah, both of my sons do not share the same penchant for things mechanical as I do. They do help out when I work on their cars and I'm getting them to the point where they do the routine stuff it and I help. The end game is to simply get them to do it without me.
 
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Old May 16, 2026 | 07:04 PM
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I reached my ability when they took out the engine and put in a motor (electric). At that point I decided to give up. However they are a bonus for dealer service dept's. Whitworth tools? OMG the only things I have that use them is 2 British Motor Cycles that live statically in the garage. How many miles has this car done?
 
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Old May 16, 2026 | 07:55 PM
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I have a complete set of Whitworth tools needed them or more wanted them back when I was into British cars manufacture from 1959 - to December of 1979 British cars..
 

Last edited by Callisto; May 16, 2026 at 08:03 PM.
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Old May 16, 2026 | 09:20 PM
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I have a big set of BSF taps and dies that I have never used. Work had a cleanup and threw them out. One day I will need them. It's the main thread type on the Matchless. Don't know about the Bantam BSA. Did a job on a Mitsubishi and needed a 10mm tap at the time. Customer proudly puffed his chest out stating he had a large tap collection.Whitworth says it all.
 
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Old Yesterday | 08:46 AM
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The few I have are from when I worked a summer as a mechanic at a Norton, Ducati, Motoguzzi dealership back in the 70's (in College). We also got lot's of Triumphs, BSAs, even a few Vincents and an Ariel. Don't have much, just a few for those "in between" sizes where neither SAE nor Metric fit just right.
 
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