Quote:
Originally Posted by shimmy
Shouldn't compression tests be done hot?
I couldn't replicate my overheating anywhere but on track, warm day, full power.
Cleaned rads, replaced stats and sensors, viscous fans, etc etc. US forums have loads of this and if you think about it if you only get it at full chat, warm day, so plenty of air and fan is not an issue. Temp of oil ruses first followed by water so it seems to be engine caused not water cooling system.
I narrowed it down to injectors, map or fuel related. Removed Map and still happened then HG failed proper and after fixed it never happened again
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Yes ideally - it wasn't done cold, just not as hot as it should have been. Was rushing and the engine had cooled for an hour or so because i realised i didn't have the right adapter to reach down the thin spark plug access holes and connect the compression tester.
Anyway, for a HG check it doesn't matter too much if the car is not red hot, as your looking for anomalies between the cylinders. Hot readings would just show around 15psi higher on each cylinder.
It does make sense what you say with regard to oil temp rising first causing the water temp to budge, although the other M3 that was with us had the same sort of oil temps 125/130 but his water temp didn't budge at all.
I'll give Simpson's a ring on Tuesday and see what they think...
Didn't you end up replacing your engine shortly after the headgasket Shimmy? was that the result of damage caused by the failed headgasket in the first place?