My 2000 bmw e46 316i on start up it goes up then down on revs and idles at 800rpm with slight fluxtion. when i rev it at idle there is a delay for no more than a second and same on take off i must bring up the revs slightly before take off. could this be fuel pump or throttle problem?

Marvin

• 85242 Answers
• Posted on Oct 31, 2008

SOURCE: low/poor idle

Here is what you need to do, a cleaning of the intake throttle blade and the idle speed control air-bypass valve, they get full of gunk over the miles and cause idle issues (stalls) 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

Romel Edmondson

• 68 Answers
• Posted on Jan 19, 2009

SOURCE: BMW E46 battery light and rev counter

oNCE THE BATTERY LIGHT COMES ON, IT MEANS THAT THERE IS A PROBLEM WITH UR CHARGING SYSTEM. mOST LIKELY THERE MIGHT BE A PROBLEM WITH UR ALTERNATOR. u SHOULD LIAISE WITH AN AUTO-ELECTRICIAN

SOURCE: the rev is going up & down on idle & when driving

have you checked your air inlet manifold for any leakages by spraying WD40 around each portall bolted to the cylinderhead gasket,check for vacuum air pipes deterioration.make sure the engine is running first ,then spray WD40 to check that the engine speed should increase.it sounds like your engine is haveing problems breathing due to heavy hydro carbons increasing./and your CO2% is dropping.

SOURCE: bmw e46 316i 1.9 L (1895cc) M43B19 2001

i have a hose that is broke on my 316i but i need a dwawing of my engine to identify the part .

SOURCE: bmw 3 series idle problem

Its most likely a timing problem. unfortunatly this can only be done by a computer! So bring it to a dealership or somene in the know with a diagnostic machine.