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Old 25 Jul 2010, 04:31 pm
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Posts: 112
Default Year 2000 Honda Accord pinking - tried everything..?

Hi, any suggestions of what may be causing my car to pink:

Is worse in hot weather, especially uphill. Have tried to cure by doing the following:

Cleaned EGR valve and passages

Replaced Spark plugs

Replaced Air filter

Replaced Lambda sensor

Replaced Knock sensor

Replaced Distributor cap

Always use Shell V power only so not a fuel octane issue
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Old 25 Jul 2010, 04:46 pm
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Join Date: Nov 2009
Posts: 13

Pinking as you probably know is pre detonation. Why are you using V-power as the higher octane could be causing it as it is not built for that fuel unless you have made modifications to it.

Try it on premium unleaded (95Ron) to see if it cures it.
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Old 25 Jul 2010, 05:01 pm
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Join Date: Jul 2010
Posts: 1

check your timing, it could be too advanced.

Or just put some engine flush through first see if that improves it.
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Old 25 Jul 2010, 05:16 pm
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Join Date: Aug 2007
Posts: 1,032

There are only two possibilities: the knock sensor is defective (would certainly bring in a check engine light and P0325 code, and you have already replaced it) and pre-ignition from deposits in the combustion chamber. If the detonation were being caused by combustion chamber conditions when the ignition fired the knock sensor would command the timing to be retarded a bunch and you would never hear knocking, so if the knock sensor is working the problem must be from pre-ignition.

The problem with pre-ignition is that it can't be controlled by the computer and it doesn't even care much about octane. The only certain fix is to remove the head (ouch!) and scour the deposits off. But you can certainly try the products on the shelves at your local auto parts stores to get the deposits off. Seafoam is popular, but I don't know how effective it is with combustion chamber deposits. You've already done the spark plugs so it isn't deposits on them. The EGR was a good idea, too... every little bit helps.

In any case, it is a serious problem. Detonation is very bad news. I once rebuilt a Volvo engine that had been detonating and every cylinder had a broken first compression ring.

EDIT - check out the first source for a description of removing carbon deposits from a Neon engine. I don't mean to insult your Honda, but it sounds like a well tried procedure.

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