Question about 1998 BMW 7 Series
I have a 1998 BMW 740iL with 120 kmiles that has started to occasionally die at idle or while driving, recovering with a restart. Recently, and also for the first time, it has started to also take long (several second) cranks automatically, trying to start, that I stop and restart easily. Any suggestions?
I have been dealing with this issue for years, i assume u have no check engine light on. Before doing any other repairs do this procedure I developed in the dealership shop to repair these stalls near or at idle problems, works most of time is done exactly as described in the procedure.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Jun 03, 2009
If the idle is low, you may want to adjust it. Check first the spark plugs, high tension wires and ignition coil if they are still in good condition. You may also want to look at the fuel filter if it needs replacement. At times loos ground wires and leaks in vacuum hoses may be the cause.
Should you experience some erratic idling as well, I would suggest to clean the throttle bodies and Fast Idle Thermo valve.
Posted on Jun 11, 2009
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Posted on Jan 02, 2017
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