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Lexus GX 470: I have 2 unrelated questions: 1- 2006 GX470…

I have 2 unrelated questions: 1-...
I have 2 unrelated questions:
1- 2006 GX470 with 136,000 miles has a "pinging" noise from the engine. No loss of power and not overheating. Been doing this for approx 6 months. Lexus tech has worked it over and offers no diagnosis other that he thinks it is carbon build-up. Thoughts on causes?
2-Same GX470 - Wouldnt start, lights on dash blinked and radio cam on/off uncontrolled. Jump started with another car, went straight to auto store and battery tested at 100% charge. Hasn't happened since. Causes?
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Answered in 22 minutes by:
11/9/2012
Lexus Mechanic: lexpert, Lexus Master tech replied 9 years ago
lexpert
lexpert, Lexus Master tech
Category: Lexus
Satisfied Customers: 9,974
Experience: Master Certified with lexus, 8 years experience with Lexus
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Thank you for posting! If you need more assistance please REPLY otherwise less then perfect feedback from you means I don't get paid.
1- get a top engine fuel induction service performed on it and have the mass air flow meter cleaned out, a new sensor may be needed. Also make sure new factory iridium plugs were replaced at 120,000 miles.
2- this is an indication of worn starter contacts. Monitor it for now but if it gets more consitant plan on a starter replacement.
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Customer reply replied 9 years ago

Thanks for the answers. I have a couple of follow-ups.


#1 - I will do as you recommended on the Fuel induction Service. What do you think is making contact inside the engine that is causing the noise?


#2 - If it is worn starter contacts, why would a boost cause the car to start?

Lexus Mechanic: lexpert, Lexus Master tech replied 9 years ago
The pinging comes from spark knock. The engine has to run 20% lean or rich to set a code and check engine light. 10-15% will cause a pinging.
2- coinsidence. When starter contacts stick simply cycling the key to start several times unjams it not a voltage boost.
lexpert
lexpert, Lexus Master tech
Category: Lexus
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Experience: Master Certified with lexus, 8 years experience with Lexus
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