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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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#50 of 58 Re: 2000 Mazda Miata with the standard stalling problem [mmaxey] by uselman Aug 07, 2009 (10:38 pm)
Replying to: mmaxey (Aug 07, 2009 11:40 am) I'm waiting for a reply from my brother about the sensors location. I've never dealt with one before. If it is your fuel pump the good news is replacing a fuel pump on a miata is rediculously simple. Mine had similar problems when the fuel pump was bad but I don't remember if it had to be warm first. Anyway if you want some info on replacing the pump let me know and I'll message you as soon as I hear back about the sensor. Cheers-Greg.
#51 of 58 Re: Tony125 [tony125] by redsripe Sep 24, 2009 (4:03 am)
Replying to: tony125 (Jul 21, 2009 10:33 am) Hi, I have the same exact issue on my 2001 MX5. runs for a few hours, then stalls. I replace the fuel pump(very simple), but the issue continued... I just replced the CPS. Now, my car won't start. It sounds like it wants to start, but it doesen't. Do I need to mess with the timeing? I moved a sensor thta is located in the front by the pully where teh timeing scale is. Does that something to do with it? I removed thinking that it was the CPS(relize the '01 in the teh back side of engine), but then I placed it back. Does this sensor needs to be at a certain angle? Not, teh CPS, but teh one I moved by mistake....
#52 of 58 2001 Miata stalling issue by redsripe Sep 24, 2009 (4:06 am)
Hi, I have the same exact issue on my 2001 MX5. runs for a few hours, then stalls. I replace the fuel pump(very simple), but the issue continued... I just replced the CPS. Now, my car won't start. It sounds like it wants to start, but it doesen't. Do I need to mess with the timeing? I moved a sensor thta is located in the front by the pully where teh timeing scale is. Does that something to do with it? I removed thinking that it was the CPS(relize the '01 in the teh back side of engine), but then I placed it back. Does this sensor needs to be at a certain angle? Not, teh CPS, but teh one I moved by mistake....
#53 of 58 1990 Miata,cold running problems by richardcburton Sep 26, 2009 (5:16 pm)
My 1990 starts great cold, but then after a minute or so runs very roughly(I think rich,but not sure)til fully warm, then runs fine.I have checked and replaced plugs,coils(ouch!),oil pressure,compression, replaced the air flow meter, and checked what I think is the air bleed valve-which has engine coolant circulate thru it-it seems to respond ok to changes in H2O temp...any ideas??
#54 of 58 Re: PLEASE READ THIS for an answer =) [philmworks] by jamarsh6039 Oct 16, 2009 (12:36 pm)
Replying to: philmworks (Apr 07, 2009 10:34 pm) Here's my story: 7 visits, same issues The last 2 trips, I bought the parts myself. The mechanic would've scalped me.   6/15/2008 113815 rough idle Catalytic Converter 273.94 O2 Sensor 427.95 PCV Valve 16.75 Valve Cover Gasket 104.47 Fuel Injector Cleaner 116.5   8/13/2008 119436 rough idle Unstick Idle Control Valve 74.72 12/26/2008124293 rough idle Replace Idle Control Valve 554.78 8/1/2009 133399 rough idle Catalytic Converter 98.79 9/10/2009 135063 rough idle Fuel Pump 283.49 Fuel Filter 129.72 Coolant Temp Sensor 195.75 Thermstat 122.97 10/7/2009 136158 rough idle Coil Pack 235 Wires 33 Plugs 21   Total pain - 2688.83   I'm in for the 7th time today. Just want them to get it right. Hopefully no more money passes hand. All the parts have been replaced, some twice. Have they hit the root cause?   John M Anthem, AZ Replies to this message: ateixeira (Oct 19, 2009 7:59 am)
#55 of 58 Re: PLEASE READ THIS for an answer =) [jamarsh6039] by ateixeira Oct 19, 2009 (7:59 am)
Replying to: jamarsh6039 (Oct 16, 2009 12:36 pm) The cat and the O2 sensor are downstream, so those were just symptoms. The problem was spark or fuel. Unburned fuel made it downstream and that's probably what clogged up the cat in the first place.   You can tell by the list they're looking at spark/fuel issues, specifically the ignition coil pack and the fuel filter and pump.   I'd go one step further and if you haven't already replace the spark plugs and especially the spark plug wires. They last about 30k miles on Miatas. On my 93 I remember changing them twice, and both times it fixed a hesitation issue.   Try that if you haven't already - and get good quality wires.
#56 of 58 mx-5 sport not starting by rj842002 Oct 29, 2009 (5:15 am)
Hi all,   My Dad has just got a 2001 plate mx-5 sport and it has not decided not to start, I am a mechanic and i had 2 of my mechanical mates over last night to look at the car. We have gone through the coils, ht leads etc and all seems to be ok. I am aware that the cam position sensor could be at fault and i have not as yet replaced this. The car then decided to start and ran (badly) for about 10 seconds. we then looked in to the fuse box inside the car where we came accross something called the key recognition system. having spent rather a lot of time reading the forums and testing out the car, I suspect that there may be something to do with the immobiliser (if fitted) or this key recognition system could be playing up. We have tried to find fault codes in the engine and also the electrical system, but nothing was coming up. By no means am i disregarding the Spark plugs, Coil units ht leads etc, but if people have already replaced these items and are still having difficulty starting the car, this in my opinion is where you need to look in to. I will keep you posted on how things progress, if they progress.   Russell Replies to this message: rj842002 (Nov 09, 2009 3:43 am)
#57 of 58 2001 Strange Stalling Problem by berylporter Oct 31, 2009 (8:27 am)
I was driving my car from NJ to MA during a recent rainy night. The car was operating perfectly. I stopped to fill up and drove about 15 miles down the highway and the car stopped. I started it and it went a short distance then stalled. This was repeated several times until I finally was able to get off the road. The car was towed to a repair shop who determined that I needed a crankshaft sensor replaced. They did so and when I returned to the shop and paid them, I drove about 1/4 of a mile and the thing acted just as it had been. I had the car towed to a Mazda dealer who put it on the computer and supposedly tested it in a variety of ways, drove it and could not replicate the problem. I paicked up the car, it ran normally until the next day when it repeated the poor behavior. Any ideas? I am afraid to drive the car any real distance. The stalling occurs much less frequently, but it does still occur. Since the engine itself doesn't appear to be the cause of the stalling I am assuming it is electrical in some way. Is there a wire that could be shorting out or pinched? Help!!!
#58 of 58 Re: mx-5 sport not starting [rj842002] by rj842002 Nov 09, 2009 (3:43 am)
Replying to: rj842002 (Oct 29, 2009 5:15 am) right, quick update. not much progress on the car itself, but i ahve had my dealer call me and they have had a 2002 model in (2.5) and they found that it was having the same not starting problems as my dad's car has. they had it connected up and again it did not bring up any errors. they then went through the car wire by wire and found that the immobiliser system had packed in. they repaired it and it was fine. i will let you know how i get on.   Russell

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