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Update: Fault finally fixed! It was the connector between the O2 sensor and the main loom. One of the four pins had broken and was making an intermittent contact. I would never have found this without the help of the boys at Pyro in Barwell and an hour at Bruntingthorpe today doing a shakedown test.

Not yet Benkay. I will try changing the MAP sensor this weekend and see what happens. Will let you know...

Thanks Dave. Interestingly I went to have a fiddle with the car this afternoon and it won't start at all now. The engine turns over, but unless you give it some revs it just dies. I cleaned the sensor up and it made no difference, however it I tried to run the car with it unplugged it fired up...

Did the map sensor fix the problem? Got a very similar issue

Took my 172 to Donnington today for my first track day of this year- started playing up again with the same symptoms. Let me recap; Car runs fine, then all of a sudden it will loose all power and run really badly. The car does not stall, but you get little or no throttle response. All of a...

I changed the injectors and did a track day at Mallory Park today. Problem occured after an hour. I then changed the crank sensor and it worked fine for 4 hours, so hopefully I have found the issue.

No, but I can do. I would have thought an injector fault would have shown up on the ECU? Any suggestions on how best to test/clean them? Also would be great to know what the 'fuel trim' actually means.

Oh, and the ignition advance goes mad moving from 4.8 to 15... when running normally it sits between 11 and 12.

Changed coil pack and leads - car ran fine for a couple of hours then started developing the fault again, even on idle. I did a live data on the car when the problem happened and the only clue is the fuel trim (short term) drops like a stone to 3 when the problem occurs. All of a sudden the...

OK, will try the coil pack. I have one on order already.

Mk2, Ph1 172. I have been suffering from intermittent loss of power, a bit like the car is going into limp home mode. Usually you wait and it corrects itself, but is getting more regular and also now does it on idle. The RS tuner highlighted an O2 sensor fault so I swapped it today - made no...

Noticed a strange problem today on my Ph1 172. When I engage the hazard warning lights only the nearside lights come on. If I think signal right using the indicators all the lights come on? What is going on!?! Its only just passed its MOT so must have been working then. Any ideas where to start?

£500 quid delivered. 2002, 60k miles, FSH AND all the ancilliaries. Will just need the belts changing and ARP bolts and it should do me fine. Worth calling these breakers on ebay as they will do a deal to avoid the ebay charges!!

Bought a phase II 172 engine today from a breaker.. should be with me next week. Got if for a good price me thinks :) I also spoke to Ktec and they said there is a technical bulletin about valves dropping in high reving 172 engines. I did a quick forum seach and came up with nothing. Anyone...

Also would a 182 engine fit? Assume its the same physically?

Thanks, that helps and makes sense. I had just come out of the hairpin at Mallory park, just gone up to third gear and was doing about 6500 revs and getting ready to change up so not long at all.

So, confirmed last night the engine is dead. Seems a valve dropped at high revs and destroyed the piston and head. Still looking for a good engine.. unfortunatey I missed out on Whiteley's! Any idea if a phase 2 172 engine will fit the car? Seems there are a few more of these about than phase 1's.

yeah, suspect this is the best bet. Is it an easy job putting a ph2 engine in? Seem to be plenty of these around.

was doing a track day at Mallory Park today and it looks like the bottom end of my 172 went bang. Horrible noise then no power. Visually you can't see any problems but the engine will not turn over. Only done 20 laps!! Can anyone recommend someone for an engine rebuild? Might consider putting a...

Hi... bought a 172 Group N rally car today :) Will probably need lots of help to keep it running.... plan to convert to to a dedicated track car.