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The BMW Range
5 Series
E34
E34 coil packs & fan clutch
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<blockquote data-quote="teejay" data-source="post: 215886" data-attributes="member: 51"><p>for a start you covered the basic possible irratic idle culprits</p><p>1. did you feel a difference after changing and cleaning the ICV and supressors?</p><p>2. are the same symptoms coming up again? -ones you mention above</p><p> </p><p>further investigation </p><p>1. coil packs, these can be checking using a multimeter as they have resistance inside that will determine if they have shorted out</p><p> </p><p>2. cam sensors and crank sensors - normally do not fail but may need alittle cleaning</p><p> </p><p>3. MAF, could also send misaligned signal that can cause A/F mixture to be off</p><p> </p><p>4. fuel pressure regulator - if you have to crank a long time in the mornings or when the car has been off for more then 8 hours or so, this could be it</p><p> </p><p>5. spark plugs - use correct ratings, sometimes fouling can causing shortings</p><p> </p><p>6. battery - very remote cases but do check if its time to change</p></blockquote><p></p>
[QUOTE="teejay, post: 215886, member: 51"] for a start you covered the basic possible irratic idle culprits 1. did you feel a difference after changing and cleaning the ICV and supressors? 2. are the same symptoms coming up again? -ones you mention above further investigation 1. coil packs, these can be checking using a multimeter as they have resistance inside that will determine if they have shorted out 2. cam sensors and crank sensors - normally do not fail but may need alittle cleaning 3. MAF, could also send misaligned signal that can cause A/F mixture to be off 4. fuel pressure regulator - if you have to crank a long time in the mornings or when the car has been off for more then 8 hours or so, this could be it 5. spark plugs - use correct ratings, sometimes fouling can causing shortings 6. battery - very remote cases but do check if its time to change [/QUOTE]
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