| electricalserv x5 |
04-04-2016 05:22 PM |
Quote:
Originally Posted by StephenVA
(Post 1074447)
OP
Most coils will go 100+ WITH NO ISSUES. When they go bad from winding failures or over heating they will run HOT and burn through the insulation housings, or they just drop DEAD. If you are staying with the X5 for the long haul it is a good thing to replace all the coils at some point besides on the side of the hwy.
You can bench test them with a volt Ohm meter. Just read the resistance across the terminals. Any higher than the others? Toss them. Without a lab scope you can not do a full output test to determine the secondary output side. You need to understand that using just one of these tests you can have a coil that passes the resistance test but will fail under high loads (going up a hill for example).
See Below from another forum:
From the u shaped Ignition Coil Harness in the manual there are 3 connectors- 1, 4a, 15. It says that 15 is positive (+) and will be the one tested against ground. Coil primary 1(-) and 15 (+) resistance = approx. 0.8 ohms, Coil secondary= N.A., Spark Plug connector= Bosch- 1k ohm +/- 20%, Beru- 1k ohm +/- 20%. This is based on M52TU+ engines.
Bad ignition coils will give you a SES light. (Engine miss firing on Cyl #X)
Start with ensuring power to your ignition connector - pin 15 should have 12 volts...not fused so be careful while probing.
to test ignition coil primary resistance you can probe terminal 1 (-) and 15 (+)..and you should read approx 0.8 ohms.
to test spark plug connector resistance the Bosch should read 1K ohm +/-20%. (Note: these are the replaceable boots on the 3.0 engines.)
NOTE: I could not find any published source for the coil specs on the 4.8is motors, other than look for the miss firing code. Anyone?
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the X5 is running fine really, the little bit of shaking has not happen for a while, I just did the tranny filter and fluid , really a big differences, I did the spark plugs last month also, road force balanced the new tires Michelin Latitudes , oil is great , last year I spend a boat load on the oil leaks and valley pan, water pump.
I still like to replace the Nav screen and I have some pixs out on the temp also.
It never ends. |
