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Mk 2 1.8 Sport Misfiring & Running Rich


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#1 Shotgun Rider

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Posted 12 January 2012 - 10:33 PM

Hi All, I'm hoping someone can help me with the problems I've been having recently.

I have a 2002, 1.8 Sport mk2.5. A month or so ago the car started misfiring and the idle was very erratic. It owuld sometimes idle at 1400 rpm before dying down to the point of stalling before firing up again, never actually stalling. The revs would fluctulate several 100rpms regularly. After a while the engine management light came on, and an ODB reader gave the diagnostic code P0172 with an error message saying that the car was running too rich on bank 1.

I took the car to a local garage, who rather than fix the issue, bodged it by closing off the EGR valve. I can't say that I was too impressed at paying £60 for a bodge but I reckoned it would tie me over till I had time to get it sorted properly. The engine management light was off and the car drove perfectly for around 4 miles before it started playing up again!

We removed one of the spark plugs on Monday and it seemed to be sooted up quite badly so I've ordered a set and will replace them shortly. The car does seem to be running smoother since removing the spark plug and giving it a quick clean (though we only did this to one of them as I was going to order new ones). We tried and failed to remove the MAF sensor at this time but tired as best as we could to spray some cleaner on it at this time. The engine management light has come on again though with the same fault code.

Any advice on what could be causing this?

Thanks in advance.
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#2 Phil

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Posted 13 January 2012 - 07:33 AM

My first thought would be the coil pack(s). You need to take it to a specialist (IMO), who is able to swap them out for a good known set without having to go to the expense of buying them on a guess. What's your location, as there are a few around the country (I'm too busy at the moment, so ... I'm out!).

On a side note, I'd go back to the original garage and demand the EGR is re-instated and 60.00 refunded; that's just a complete bodge.

P
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#3 Shotgun Rider

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Posted 13 January 2012 - 09:31 AM

My first thought would be the coil pack(s). You need to take it to a specialist (IMO), who is able to swap them out for a good known set without having to go to the expense of buying them on a guess. What's your location, as there are a few around the country (I'm too busy at the moment, so ... I'm out!).

On a side note, I'd go back to the original garage and demand the EGR is re-instated and 60.00 refunded; that's just a complete bodge.

P


Thanks Phil. I'm from West Wales, 20 miles west of Carmarthen to be precise and I don't know of any specialists within a reasonable distance. If someone knows of one, I'd appreciate a heads up.
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#4 Shotgun Rider

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Posted 13 January 2012 - 03:40 PM

Would a coil pack throw up a specific error code?
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#5 Gilj

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Posted 13 January 2012 - 04:02 PM

Interesting read - I keep getting occasional miss fires often just after I hit the gas on my MK2.5, throws up engine code P0302 when I get enough miss fires in a row, starting to think this could be down to a coil pack too. I think that P0302 means cylinder 2 miss fired... it's always the same one for me, I have cleared it off a couple of times while I troubleshoot.

I think swapping the coil packs over and seeing if a different cylinder throws a code should do the trick?
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#6 Gilj

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Posted 23 February 2012 - 03:28 PM

update; Swapped my coil packs and now throwing code P0300 - getting some new coil packs on saturday.

How are you getting on Shotgun?
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#7 jonfogg

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Posted 23 February 2012 - 05:21 PM

Have you tried new leads? When mine was misfiring i slung a set of these on and it stopped it straight away http://www.racingbea...515b-1674-p.asp

absolute bargain for what you get!
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#8 Shotgun Rider

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Posted 23 February 2012 - 05:43 PM

update; Swapped my coil packs and now throwing code P0300 - getting some new coil packs on saturday.

How are you getting on Shotgun?


No luck with mine at all. I had it on a diagnostics machine around two weeks back and the guy reset something and it ran quite well till a couple of days ago. He did recommend that I change the front O2 sensor as it was on the way out, this has not made any difference though and this morning the ECU light came on again.

I spoke to Sam Goodwin earlier who said that it could be a coil pack, though my mechanic told me that it would be a constant misfire if that was the case. Is that true? I'm currently trying to find a used MAF sensor at a decent price to see if that fixes the issue.

If all else fails, I am going to Birmingham mid March and I will make a detour on the way home for Sam Goodwin to have a look at it.
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#9 Swampy

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Posted 23 May 2012 - 10:32 PM

Sorry to bring up an old thread but Ive been having similar troubles with my 2003, 1.8 Sport mk2.5. Its throwing up the p0172 code - Running too rich bank 1. I recently changed my air filter and then the Engine light came on. I changed the front o2 sensor after advice from an MX5 specialist and some of the other mechanics I used to work with and had the light switched off. It came back on after 48 miles. I also got told that I'd installed my MAF the wrong way round. I have sorted that now but havent had the code checked or turned the light off yet. The car seems to run rough when cold like its being restricted somehow but feels ok when it warms up to temperature. Any ideas? Coil pack?
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#10 ScORTED

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Posted 25 May 2012 - 02:43 PM

leave the battery off for a few hours to clear the ecu then go for a long drive making use of all the gears / rev range see if it comes back; I suspect it won';t if your maf is the right way round
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#11 Swampy

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Posted 25 May 2012 - 04:58 PM

Thanks. I did wonder if the ECU would re-learn after battery removal. I know it did on my old Lexus.
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#12 ScORTED

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Posted 25 May 2012 - 05:41 PM

its worth a punt and its not going to cost anything beyond a bit of time and fuel
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#13 sarahr1335

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Posted 13 April 2013 - 05:04 PM

Hi everyonel, I know this is an old thread but was hoping someone can help me with my problem please?

I have a 2000 mk2, MX-5 1.8 Spotr. The last year or so ago the car started misfiring, but intermittently. It would misfire for a while, loose power then the power would kick in and it would drive like nothing had happened. I took it to many garages but they could not detect the problem as it always seemed to be running fine when it was in the garage. As the misfire was not constant they advised that it needed to misfire while it was in the garage to detect the problem.

I researched this problem and had the plugs and leads changed, however the misfire continued and no one seemed to know what was causing this. I had a full service in November and they replaced the leads again, as I was told they was not fitting correctly... so that was two sets in one year!

Well the problem persisted, then after more garages and cost later I was informed the coil pack had gone and when it came to having its MOT it failed on emissions.

Since then I have replaced the coil pack with a new genuine mazda part, a new catalytic converter,which was completed blown due to the misfire proble.

I was advised to changed to airbox as it had a performance air conduct kit... this was already fitted on the car when I bought it about 6 years ago.. But was slightly cracked, I was told this could be sending messages to the sensor to send more fuel through, therefore could be culpret to the petrol running rich and emissions problem. So I have replaced the airfilter and box back to its original.

However, when the car went int for its second MOT, The car has still got an emissions problem and only just scrapped through the MOT. I have been informed that the petrol is still running too rich and it also has a slight misfire on start up... its very jumpy but driving is fine and seems to be driving well.

I was wondering if this is an easy things to get fixed or am I better cutting my losses and getting rid of my much loved car :( Have I caused any serious damage driving with that intermittent misfire fault?

Also the ABS light keeps coming on too.

Can anyone advice on what could be causing this? or point me in the diection of a good garage that wont rip me off, as i have already spent well over £500 so far.

Many Thanks in advance. :)
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