M3 Evo do i let them take the engine apart
Discussion
About three weeks ago my 96 Evo started to play up by misfiring under loads over 5000 rpm. Then one evening as I was pulling on to my drive it was missing all the time. I got some one to come out and look at the car and they found it was not firing on all cylinders. Under further investigation we found that two of the plugs were very loose, you could undo them with your fingers and the one was out completely and the end of the plug was missing. The last service was done by a specialist in the uk and they changed the plugs.(if any one wants to know who this garage is then please e mail me. I am looking into this, as if this fault with my car turns out to be from this mistake of not tightening the plugs I will be looking at bringing a legal case.) I have never heard of plugs coming out nor has my local garage.
I then asked the garage to do a full service and of course change the plugs. This was done but we could not get the Ngk plugs and they fitted a bosch twin spark and it seem to run ok for a day or so. Having got the car back it still seemed down on power a new air flow meter cured this for again a day or so. The car has not run right since this event. The problem I have now is that,
1, it is using fuel like a thirsty hooker as low as 14 – 15mpg in town and low 20s on a run, before I was getting 21mpg in town and 30-35mpg on a run.
2 it seems to be holing back and has loads of flat spots in low revs really noticeable going up hill it seems to surge, on tick over you can hear it go from lumpy to smooth every few seconds or so.
3 tail pipes are black when normally they are white.
My Garage want to open her up as they think the one of the values has gone in no 2 cylinder. I have had the car on a Bosch computer and they have said there are no faults recorded for the compression.
I do however have the following faults
A2, 4d, A, 48, 29
Nothing else showed up.
My garage think that the very end of the plug might of got down into the engine and is stuck somewhere causing this fault. Where I went for the computer test they think that I would hear any valve problems through the exhaust and as far as they could tell the valves are not the issue.
I don’t want to start taking the engine apart until I have gone through all other routes and could some one explain the fault codes as they just gave us the list of faults above. Also any ideas of what might be causing this problem. Really would be good.
Thanks
Anthony
Spain
majesticproperti said:
I have now fitted the new plugs and it ran great for a couple of days, but now its back down on power rather lumpy at times and not very responsive, if i clean the plugs and put them back in it runs well but again for a few days, any ideas.
Sounds like a fuelling problem to me - the plugs are gettinf fouled. Are you using decent petrol?
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