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NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

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Old 01-05-2013, 09:31 PM   #21
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is there any other way to check the codes?
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Old 01-05-2013, 10:58 PM   #22
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FWIW i dont use the led thing it says to make, i use a paperclip and the codes flash on the check engine light.
Engine Diagnostics

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Old 01-05-2013, 11:38 PM   #23
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Gotcha...will do tomorow...Cold sleeting and snowing now.
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Old 01-07-2013, 09:03 PM   #24
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well....no blinks...solid check engine light.

Might sneek it down the road to the shop tomorow after I bleed the clutch to check codes....seems to run strong though and the tick went away.
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Old 01-09-2013, 12:35 AM   #25
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Well....idle went to hell after a road trip...Probably gunna change plug wires...timing keeps jumping.

Didnt get a chance to check codes...hope I have time tomorow.

I have a funny tick/knock under throttle that comes and goes....I hope its not the knock I think it is...its a new motor...or so he said when I bought it.
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Old 01-11-2013, 11:33 PM   #26
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Well....I dont think it was the knock i was worried about...I was runnin with a mustang and I shifted from 3rd back to 2nd (damn short throw shifters) and reved about 8 grand. If it was a rod knock it would have probably flew apart.

Car runnin good but still rough idle....read codes and was O2 sensor not responding and something to do with air flow...cant remember...will check again when I have time.
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Old 01-13-2013, 03:25 PM   #27
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Miata rods stretch when overevved. The piston can make contact with the head when that happens. It sometimes takes a little time before failing, or doesn't. Maybe you dodged a bullet.
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Old 01-13-2013, 07:39 PM   #28
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Thanks for the info. Guess I gunna rebuild the spare before I thought I would.

I changed the throttle body with the one on the old motor. Idle cleared up a lot but still a little choppy....Still havnt changed plug wires. Thats next.

The intake has a brand new egr on it...will a bad egr make it idle rough? I have bought plenty of bad new parts in the past. Maybe even a vaccuum leak under the egr....still looking around for possible vaccuum leaks.

Car still running strong. Supposed to rain tomorow and the top is rough so looks like Tahoe weather to me. I own 2 of those and dont have many issues with them.

Kinda off topic but it looks funny with a Miata parked between 2 Tahoes.....kinda like a go-cart.

Thanks again for the info so far -B-
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Old 01-20-2013, 08:57 PM   #29
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Anyone got anything on the EGR?
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Old 01-21-2013, 10:14 PM   #30
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sorry i cant help much on the egr stuff, im battling a rough idle as well. clean idle air valve.
Warm up the car, then unplug your IAC. Adjust the idle screw at small increments for 900 - 950 rpm, with no electrical load on the engine (headlights, A/C, heater, defroster, etc. off).
Turn the engine off and back on to verify idle speed.
Once satisfied, turn off engine, plug IAC back in, and you should be OK.
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