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2006 pilot with random check engine light problems. Check…

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Hi! 2006 pilot with...
Hi! 2006 pilot with random check engine light problems. Check engine light will come on and remain lit for days/weeks and then disappear. Sometimes light is just on but car runs fine (although the ECO will not kick in). Sometimes when the car idles (after starting or at stoplight) the light flashes the engine becomes bogged down and car will only slowly accelerate and shake. If I stop car and restart car will run/accelerate ok (although light will remain on). Codes read by autozone indicate Multiple cylinder misfires. Replaced spark plugs 6 months ago but has not solved problem.
Submitted: 2 years ago.Category: Honda
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Answered in 17 minutes by:
2/13/2016
Mechanic for Honda: Honda-Man, Honda Mechanic replied 2 years ago
Honda-Man
Honda-Man, Honda Mechanic
Category: Honda
Satisfied Customers: 3,348
Experience: I have an Associates Degree in Automotive. 10 Years experience on all makes and models. 20 Years Honda only including factory training. Over 30 years total.
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Welcome to Just-Answer. My name is ***** ***** online handle is Honda-Man. I have over 31 years experience repairing Honda and Acura vehicles. I would be happy to assist you with your Honda or Acura question!

Your symptoms and misfire codes can be caused by a sticking EGR valve. The EGR valve should only open when the engine is under a load not at an idle. If it hangs open it will cause multiple cylinder misfire codes. Carbon can get caught between the EGR valve and valve seat or the valve can just intermittently fail. It's opened and closed electrically so the internal motor sometimes sticks. This can happen without setting an EGR fault code. Another possible cause is one or more bad ignition coils. One or two coils can fail but you can still have multiple misfire codes. If it misfires long enough it can set false codes for non misfiring cylinders. If the codes are all cleared then read as soon as it starts to misfire again you can find the first cylinders to misfire. Usually there will only be one or possibly two if you have a coil failure problem.

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Thank you! ~Honda-Man

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Mechanic for Honda: Honda-Man, Honda Mechanic replied 2 years ago

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Experience: I have an Associates Degree in Automotive. 10 Years experience on all makes and models. 20 Years Honda only including factory training. Over 30 years total.

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