Bought car with "blown engine" turned out to be coils!
10-15-2011, 08:48 PM
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Bought car with "blown engine" turned out to be coils!
I had resigned to getting a short block after getting dissapointing compression results of around 45-50 psi. Of course after reading some tech info I realised that those numbers weren't that low at my cranking RPM of 133 according to my data logger!
So since I had 6 even compression pulses, I decided to take a gamble that the compression test just wasn't accurate. I grab my trusty timing light and hook it up one coil at a time.
Only the 2nd trailing coil was firing at all!
So I rush down to O'Reily's, pick up all 4 coils, 2x BUR9EQ and 2x BUR7EQ plugs. Throw it all in and VIOLA .. car comes to life smooth as silk.
I'm grinning ear to ear over this, went out and beat on it a little to celebrate. Check engine light went off finally on it's own so off to emissions testing on monday!
Just wanted to say THANK YOU to the forum because if it wasn't for the wealth of information that is easy to find with a quick search on this forum I don't think it would have been this easy.
So since I had 6 even compression pulses, I decided to take a gamble that the compression test just wasn't accurate. I grab my trusty timing light and hook it up one coil at a time.
Only the 2nd trailing coil was firing at all!
So I rush down to O'Reily's, pick up all 4 coils, 2x BUR9EQ and 2x BUR7EQ plugs. Throw it all in and VIOLA .. car comes to life smooth as silk.
I'm grinning ear to ear over this, went out and beat on it a little to celebrate. Check engine light went off finally on it's own so off to emissions testing on monday!
Just wanted to say THANK YOU to the forum because if it wasn't for the wealth of information that is easy to find with a quick search on this forum I don't think it would have been this easy.
10-16-2011, 01:27 AM
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10-16-2011, 01:29 AM
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10-16-2011, 01:49 AM
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I thought I got a good deal when I purchased my 8 back for $9,200 before taxes & dealership fees when 8's were around $14k because of a "bad engine."
But, this was also around the time when Mazda first announced they were extending the warranty on 04-08 models and since the dealership was not a Mazda dealership they were unaware of the bulletin they lowered the price.
All I had to do was a basic tune-up (coils, plugs, wires) and it ran perfect... until the clutch started slipping and the brand new tires that I was promised were never received.
10-16-2011, 12:17 PM
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yeah the car was just flooded because of no ignition from the bad coils. the low compression is caused by the fuel washing away the oil so the apex seals arent sealing well. the rpms on start were probably caused by a low battery from start attempts
10-16-2011, 04:33 PM
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10-17-2011, 09:53 PM
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The actual NGK Part number has changed to 5777 and 6917, respectivley.
Last edited by ChrisAZGT; 10-17-2011 at 09:55 PM.
10-17-2011, 10:02 PM
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10-18-2011, 04:42 PM
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Trailing plugs were shimmed, yes.
Not that it matters now, got free OEM plugs thanks to Recall 4206f. Going back in to have them installed tomorrow at no charge. Huzzah.
Not that it matters now, got free OEM plugs thanks to Recall 4206f. Going back in to have them installed tomorrow at no charge. Huzzah.
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