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Mazda MX-5 Miata Starting and Stalling Problems

58 messages,  Last post on Nov 09, 2009 at 3:43 AM

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What is this discussion about? Mazda MX-5 Miata, Engine, Convertible

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#9 of 58 Re: Stalling Mystery - 2001 Miata [jracer] by thesluce Apr 30, 2007 (3:58 pm)
Replying to: jracer (Apr 12, 2007 7:56 am) Hi J,   I also had this problem and after much research by my mechanic (mainly) and by me (secondary) we figured out what the problem was. It is the Cam Position Sensor (CPS) and it appears to be a common problem. Many websites have information on this and several of them refer to Miata.net where you can find all kinds of Miata-based information. Here is a link of what someone wrote about our same problem:   http://grassrootsmotorsports.com/news/082005/cam-position-sensor.php   The part is roughly 80-100 dollars although a mechanic may charge more for it (mark-up). Labor isn't tough and should maybe run you another 80-120 dollars.   Hope this helps.   Cheers, Paul
#10 of 58 Re: 2001 Miata stalling while driving [jerseygirl137] by thesluce Apr 30, 2007 (4:01 pm)
Replying to: jerseygirl137 (Jan 19, 2007 3:19 pm) Hi Jerseygirl:   Your problem is the Cam Position Sensor (CPS). It probably needs replacement. The part should cost somewhere around $100 and labor about the same. See my other post to another person on this same message list for more info.   Cheers and good luck, Paul
#11 of 58 Re: '99 Miata Engine Light [hookedongolf20] by debbiek May 12, 2007 (11:27 am)
Replying to: hookedongolf20 (Apr 14, 2007 1:43 pm) I also had the same problem with my 99 Miata for about a year. I cleaned the built up carbon in the manifold and the check engine light has been off ever since. Only cost me a few bucks for the throttle cleaner. YIPEE!
#12 of 58 Re: 2000 Mazda Miata with the standard stalling problem [uniboy] by buffmx5 May 26, 2007 (6:32 am)
Replying to: uniboy (Apr 14, 2007 2:02 pm) Hey Robert hope this helps out Miatas are known for timing chain to "go" 60k hopefully you have a decent relationship w/the prev owner and you can find out what kind of modifications were made prior Patrick '00 Silver
#13 of 58 Miata 1999 - engine rough idle, no power by kahutek Jun 05, 2007 (9:06 am)
Occassionally, I start my '99 Miata and the engine idles poorly, it revs up with difficulty, but it runs. Then I take it out on the highway, and after 10 minutes it starts losing power and the catalytic converter gets so hot I can smell it inside the car. This happens once a month. The runs again the next day. The engine light is on, but the mechanic says it's the safety interlock warning (or something) for an automatic trans; I have a stick shift. Now the mechanic says it's my O2 sensor and my catalytic converter needs to be replaced. What is the real problem? Replies to this message: ateixeira (Jun 21, 2007 11:28 am) ron77 (Nov 19, 2007 6:56 pm) Thierry76be (Jan 06, 2009 8:19 am)
#14 of 58 Stalling, Engine Light by mestull Jun 06, 2007 (5:00 pm)
I hope this helps someone. My 2005 Miata (non-turbo) started idling poorly, then progressed to stalling, and the Check Engine light came on. It sure seemed like a sensor problem. I had the codes read. There was a fair list of them. I reset the faults by momentarily disconnecting the battery. The faults came back. So I started replacing the likely sensors. Nothing helped.   Finally, I removed the throttle body, and found the inside of the plenum behind it coated with an oily mud. The crankcase ventilator (PCV valve) spits a little oil mist in there. Then the super fine dust that finds its way through the air filter turns that into mud. I cleaned as much as I could reach and the throttle valve. That didn't fix it.   But after thinking about it, I figured some of that oily mud may have been partially bocking the idle bleed needle valve, or the idle bypass (both located in/on the throttle body).   So I opened the idle bleed a lot. That fixed it. I reset the faults again, and they didn't come back. So my car idles perfect (like new) and there's no Check Engine light on.   The idle bleed needle valve is a phillips head screw, that's recessed in a hole, facing the passenger side on the top of the throttle body.   As far as the underlying cause of the problem... The PCV valve worked fine. So I assume an oily film is normal in the plenum. I upgraded the air filter to a K & N to hopefully reduce the fine dust.
#15 of 58 Re: Miata 1999 - engine rough idle, no power [kahutek] by ateixeira Jun 21, 2007 (11:28 am)
Replying to: kahutek (Jun 05, 2007 9:06 am) We had rough idling and power loss on our old 626 and it turned out to be dirty fuel injectors. A throttle body service fixed the issue, but at the dealer is was very pricey, about $500 IIRC.
#16 of 58 Re: 99 Miata Problems [caledelaney] by bigbozer1 Jul 20, 2007 (2:57 pm)
Replying to: caledelaney (Mar 19, 2007 5:51 am) I have a 1999 10th Anniversary 6-speed. It is coming close to 90K miles now and I have not spent a dime in repairs. I use Mobile 1 oil and change every 5000 miles. I have not even changed the timing belt. I guess I have been very lucky. TOUCH WOOD! Replies to this message: ateixeira (Jul 23, 2007 6:31 am)
#17 of 58 Re: 99 Miata Problems [bigbozer1] by ateixeira Jul 23, 2007 (6:31 am)
Replying to: bigbozer1 (Jul 20, 2007 2:57 pm) Don't quote me on this but I think the engine is non-interference. You could be stranded, though.
#18 of 58 Won't start by lost6 Aug 16, 2007 (7:19 am)
My niece bought a 99 Miata and ran the battery down listening to the radio. Replaced the battery, but the engine won't turn over. She left the key on over night. Any ideas?

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