*Glenn*

The crank sensor fault on a Merc will not always throw a fault code in the engine ECU. You can sometimes get a fault code in the transmission ECU with the fault code "input speed signal". This occurs in BMW's too. You can always just keep driving it until it stops and won't start again, then it's easy to diagnose, but not to comfortable to drive around knowing it can let you down at any time.

I would get a PPI done by the closest BMW repairer in the area to safeguard yourself. Mc Millan BMW is the closest or BM Workshop in Grey Lynn. Find out who services it for him now.

Weird ? Not in Jamaica

That'll most likely be the crank sensor....quite common

Regarding valve stems - would they show up on a compression test? No and they are not DIY on a valvetronic engine

Try checking with Joe @ Eurosurgeon

I would replace all the breather hoses associated with the CCV valve while it's all exposed- they crack. I would also replace the crankshaft position sensor (by the starter) while your in there- these also regularly fail. Use new manifold gaskets. The oil on the oil pressure switch is probably coming from a leak around the oil filter / cooler housing. Camshaft sensors and vanos seals leak in the front of the motor. Rocker covers leak, brake vacuum pumps leak, sump gaskets leak, water pumps leak, power steering pumps leak, radiators, thermostats, expansion tanks, hoses...... you should all know the lists now, nothing changes. N42 & N46 motors (and most of the valvetronic motors) also give issues with valve stem seals. The same result with idling and then accelerating, resulting in the smoke and excessively high oil consumption, made worse by the leaks on the drive and garage floor. These motors are one of the most problematic I have ever had the unfortunate opportunity to work on and empty wallets quicker than a pig at a trough.

Is the "new" battery charged ?? Terminals clean and on correctly ??

Ray @ Hellbm will have one. Ring him

Can do

^^^^ This. We use it all the time

You hit the nail on the head there Amber-Leigh

Get it scanned first for issues...maybe just something minor

Why not run for Mayor Allan

It's a shame when this happens, maybe they were just very busy at the time.

No it's not, the bore size in the bell housing is larger than the pin locating hole in the flywheel/flexi plate. And it must be accurate if your are doing anything with cam timing/vanos.

Not serviceable... by making sure adjustment is correct and the brakes are bled properly. It's a bit hit and miss. Inbalance on a rolling road can also be caused by tyre pressures

Could also be the brake proportioning valve if fitted . Follow the brake lines to the firewall and see if it goes into a valve body bolted to the firewall

Sorted

My Schnitzer 17" X 8.5 type 3's are $1100 + Gst each to replace through BMW . Yours will probably be dearer

No it doesn't on a E39

I would be expecting higher readings up around 200psi if it was done at WOT if the test gauge was in good condition. Someone else also suggested it wasn't done like that. It's also best to use a screw in type gauge that has a seal as well, rather than a hand held type. The battery may not be that strong and No4 cylinder would be one of the last cylinders to be tested. The only way to be reassured is to get it rechecked or do a cylinder leak test if necessary. What did they suggest ? Did the test also include a full scan and report on any faults in any of the control units ??

No.. I wasn't suggesting that at all. Technicians work with other peoples repair instructions all the time... ie: TIS It's best practice pulling something apart to scribe or twink location points for critical items to insure correct fitting when reassembling even when you have instructions... ask any technician or engineer... it's like using a ruler in school. Many documents have unclear or misleading diagrams & photos.

Twink or a sharp scribe can often be your friend

A 5% variation is acceptible when testing at cranking speed... some people might accept more. If a BMW has low compression on any cylinder it will not idle smoothly as plenum chamber vaccum gets upset and that effects airmass readings.