525 EFI fault code question, please help
06-29-2017, 08:50 PM
#1
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525 EFI fault code question, please help
Looking for a little help. Short story is I had a alarm go off this past weekend on a 2005 525 EFI w approx 160 hours. Motor was running great prior to alarm and during. No reduction of power and running smooth. 5 beep alarm. Scanned the motor and had 3 fault codes that I need help with. #77 cam sensor, 17 idle map str, and 21 ect overHT. My question is, should I simply replace all three or is there a sequence I should try so as not to buy unneeded parts (the damn cam sensor is very expensive, $700 ish). Also, any issue with using a ac delco cam sensor that is much less expensive. Any help would be appreciated. Thanks in advance.
06-30-2017, 08:16 AM
#2
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Based on my experience with my 525's...
Did the alarm go off at higher rpm or as you were coming off plane/idle, say less then 2,000rpm. If off plane or idle, replace the MAP sensor. also, do not throttle down at a rapid pace because that will cause a map code. I doubt it is the cam sensor.
Did the alarm go off at higher rpm or as you were coming off plane/idle, say less then 2,000rpm. If off plane or idle, replace the MAP sensor. also, do not throttle down at a rapid pace because that will cause a map code. I doubt it is the cam sensor.
