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BMW E46 N42N46 Random Long StartupCrank SOLVEDFIXED see description
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=9uAKn31s0UI
TLDR; Chain jumped a tooth on the intake VANOS sprocket because of a broken chain guide rail which caused low compression. Replaced guide rail and chain, re-timed the engine and it works great now. Complete fix video here: • N42/N46 Chain Replacement DIY Complet... . • My 2001 E46 316ti BMW with N42 engine started having trouble starting when engine was cold. It would start and then immediately stall. After that I had to crank for about 30-45 seconds before it started again. It would start normally when warm. • The car was parked for the summer and after I started using it again for the winter I noticed random long crank. • I tried with no success: • i tried starting with starting fluid: no success, • checking for vacuum leaks (and CCV system): all ok, • checking fuel pressure: all OK, • replacing fuel pump and fuel filter and fuel pump relay: no change, • checking spark and replacing spark plugs: no change, • checking for leaking injectors: no faults found, • no related error codes (in INPA), • replaced crankshaft sensor (original): no change, • checked EWS (anti theft): all ok, • checked compression (6 months before this issue): in the middle of min-max spec. • • SOLUTION: • I checked the compression again when it would not start. It turned out that it was very low, 80 PSI instead of 150 PSI for cold start. I read on the internet that sometimes oil pressure regulator gets stuck and does not relieve pressure. If the pressure is to high (more than 6 BAR) the lifters rise to high and that causes the rocker arms to rotate and push the valves to slightly open position. • I then raised the car, dropped the sub-frame and removed the oil sump to check oil pressure regulator. • Then I noticed a small piece of plastic stuck on the side of the oil pump! After investigation i determined that this piece of plastic broke of from the chain rail guide! • I then removed the valve cover gasket and checked the timing with special N42/N46 locking tools. • I put the engine in TDC on first piston with flywheel pin and inserted front VANOS and exhaust camshaft timing locking tools with no problem. Then I tried inserting the locking tool for the intake camshaft and it was out of alignment for about 15 deg! • After further investigation i concluded that the chain jumped a tooth on the intake VANOS sprocket and that cause the intake camshaft to be out of timing, which was in turn causing low compression. • When the engine was cold there was simply not enough compression to get it started, after some cranking the compression increased just enough to start. When the engine was warm, there was enough compression. • Bad intake cam timing also caused lazy throttle response and very poor acceleration until engine warmed up. • I removed and checked oil pressure valve and there was no debris or gunk, it looked OK. • I then replaced the chain and guide rail, re-timed the engine and it started right up; the problem is now gone! BimmerZen assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. BimmerZen recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of BimmerZen , no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not BimmerZen.
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