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Old 09-15-2015, 04:50 PM
StephenVA StephenVA is offline
Join Date: Jun 2013
Location: Virigina, USA
Posts: 2,039
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Tip and Trick for those who have the REPLACEABLE coil to plug boots. Replace them at 80-100K (OR 10 years) as the resistance will grow until the plug will not fire as the boot resistance exceeds the coil's output. They just twist and pull off. They are nothing but a really short plug wire. Later models have molded boots that do NOT come off. Images below...

The first indication is poor idle and miss fires in high load situations (part throttle hill climbs)

Cheap part but make sure you match up coil brand/manufacture to the boot you are buying. (Bremi/Bosch)

More images BMW E53 X5 M54 3.0L Engine Ignition - ECS Tuning
Attached Images

2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green

Last edited by StephenVA; 09-15-2015 at 05:05 PM.
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