[Rob22760]

The lads car Engine management light comes when sat idling, the fault code p0303 - miss fire on cylinder 3 - so we did the coil pack check no difference on 3 when removed so cleared the fault, purchased a full set of coil packs & new plugs, fitted them car ran great for 10 -15 mins, then missing again same code, really scanned it got new fault codes p0303 again & the Map & Mfi sensor code, so purchased new map sensor, same again ran great - 10 - 15 mins later P0303 code, so was told could be the camshaft sensor, so pulled the sensor can cough and started running awesome, so ok another sensor replaced both sensors and you quessed it 20 mins in engine management light on p0303 error car miss firing on 3...... if you clear the fault and drive the car it's great no miss fire drives awesome soon as you stop and idle the light comes on ..so big question any ideas because I've ran out now lol

 

[Rob22760]

Oh I forgot to put that bit, I did compression test on all cylinders, 116 psi on all, so you reckon possible be a blocked injector on 3, I'll take a look at that next thanks,

 

[Rob22760]

Thanks Guys, i brought a new compression tester they are coming out at 175 psi on all four cylinders so I've took it to a garage and had it plugged into a super computer and we have narrowed it down to bad wiring loom on three or Ecu, so I need to chase the wiring back and check it out. Failing that have the Ecu tested.

 

[Rob22760]

if any corroded connections you would get a fault code flagged, if no fault codes other than misfire based codes then mechanical or injector issue, just in middle of doing a cooper s engine that had miss on 4 smoking really badly turned out broken piston caused by the timing chain stretched and kept driving it hard then blocked the cat up,, ended badly now all pistons out found all oil rings cracked and broken that compression tested at nothing on number 4 and the others were 120psi,, the oil use blocked off the cat and caused back pressure and heat spike back to cylinder 4 and blown the bottom part of piston off

That look fun lol