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I have 2000 Honda Civic 4 cyl Front Wheel Drive Automatic 102000 Km done.
When I driving my car sometimes when I'm going to accelerate after slowing down (breaking), although the accelerator pressed it will not accelerate and also the RPM remain same and the accelerator pressed further a Knocking sound comes and it will then accelerate. This is not always happen. Gradually increases the occurrence.
I performed full tuneup for the car.cleaned the throttle body and replaced the fuel filter and also spark plugs. After that it runs very well. Had more power and no such abnormal sound.
But after about 3 weeks, when I'm driving a hill street sometimes that knock sound comes from the engine side. It will comes when I depress the accelerator pedal suddenly to get more power after slowing because of breaking. I will appreciate if some one help me to solve this problem.

. Install colder running NGK spark plugs. Here was my experience:

https://www.askmehelpdesk.com/cars-t...tml#post324106

. Retard timing. Mark an index line on the distributor housing and mounting plate. Loosen the 12 mm distributor mounting bolts (3) and rotate the distributor 4 mm clockwise. Tighten mounting bolts and your problem should be infinitely better.

If the problem persists, buy higher octane gas or install a colder running thermostat.

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Originally Posted by TxGreaseMonkey

. Install colder running NGK spark plugs. Here was my experience:

https://www.askmehelpdesk.com/cars-t...tml#post324106

. Retard timing. Mark an index line on the distributor housing and mounting plate. Loosen the 12 mm distributor mounting bolts (3) and rotate the distributor 4 mm clockwise. Tighten mounting bolts and your problem should be infinitely better.

If the problem persists, buy higher octane gas or install a colder running thermostat.

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Thank You for helping me to solve my problem.
I have some information on this, After the engine tuneup it was run very well. There was no any knocking sound. After about 3 weeks I felt it losing power and there is more carbon in the exhaust. Also reduce the fuel economy. Knocking sound is coming when I depress the accelerator suddenly to get more torque.

Keep me posted.

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Originally Posted by TxGreaseMonkey

Keep me posted.

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Thank You Very Much for your quick response. I'll Try this.

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Originally Posted by civic_ferio

Thank You Very Much for your quick response. I'll Try this.

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My honda civic 2000 is not a V-TEC. Are NGK ZFR7F-11 spark plugs suitable?

I was not recommending a specific plug no. for your car--that you will have to decide on. Honda always recommends a colder running NGK plug, for people who live in warm climates. Try that first. It should be located on a sticker under the hood.

Quote:

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Originally Posted by TxGreaseMonkey

I was not recommending a specific plug no. for your car--that you will have to decide on. Honda always recommends a colder running NGK plug, for people who live in warm climates. Try that first. It should be located on a sticker under the hood.

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Thank you for helping me to solve my problem.
I want to tell you,
Engine knock was there before the engine tune-up. But after the tune-up it disappeared. It ran great. Acceleration was great. After some time that happened again. No difference in weather. Is this related with the engine coolant?
Is there any relation with ignition timing and engine knock?
Can there be a problem with timing?

Thank You in advance.

Yes, timing can be crucial. You will have to try all of the suggestions I've given you and experiment with what works in your situation. Start by installing colder running plugs. Consult NGK, if necessary.

Quote:

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Originally Posted by TxGreaseMonkey

Yes, timing can be crucial. You will have to try all of the suggestions I've given you and experiment with what works in your situation. Start by installing colder running plugs. Consult NGK, if necessary.

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I appreciate your quick response.

Is there any risk, installing colder running plugs?
I checked several places but I couldn't able to find colder running plugs here.
Is there any relation with the anti-freeze coolant?

Determine the plug that you want to try and buy it online, if it's not available locally. The greatest risk is to do nothing. The knock you are experiencing will cause major engine damage, if left alone. If you installed the proper 50/50 mixture of antifreeze and distilled water, you should be fine.

Quote:

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Originally Posted by TxGreaseMonkey

Determine the plug that you want to try and buy it online, if it's not available locally. The greatest risk is to do nothing. The knock you are experiencing will cause major engine damage, if left alone. If you installed the proper 50/50 mixture of antifreeze and distilled water, you should be fine.

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Thank you very much for your support.
I have no experience on engine knock earlier. This knock is coming with little vibration when sudden acceleration after breaking specially climbing a hill. I thought this is related with the transmission. Because it is automatic transmission. I changed the ATF also. But it didn't solve the problem. How can I identify whether this is engine knock? This is the doubt I have.

Fill the tank with high-test gasoline. If the sound goes away, you know it was engine knock.

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Originally Posted by TxGreaseMonkey

Fill the tank with high-test gasoline. If the sound goes away, you know it was engine knock.

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I always maintained full tank of fuel with Octane number 95 which is the highest number available in the local market.

Your knock sounds more serious then pinging. Have the oil pressure checked with a mechanical gauge. I recommend that you take it to Honda for servicing. You want to rule out the possibility of connecting rod knock.

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Originally Posted by TxGreaseMonkey

Your knock sounds more serious then pinging. Have the oil pressure checked with a mechanical gauge. I recommend that you take it to Honda for servicing. You want to rule out the possibility of connecting rod knock.

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This Knocking is not coming at the beginning of journey although I depress the accelerator suddenly. It runs very smoothly. It comes during the long trip after about 1 hour, because of this I feel it can be a heat related.

Thank you very much

Go back, then, to my original suggestions. Try installing colder running spark plugs or a lower temperature thermostat. Make sure you have changed the coolant within the last two years and that the car is not starting to overheat.

Quote:

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Originally Posted by TxGreaseMonkey

Go back, then, to my original suggestions. Try installing colder running spark plugs or a lower temperature thermostat. Make sure you have changed the coolant within the last two years and that the car is not starting to overheat.

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Hi,
I used NGK FZR6J-11 plugs. Is it necessary to retard timing?

Thank you.

Did the colder running spark plugs help?

If the knocking has stopped, then there's no need to retard the timing.

Have you had any work on the timing belt? If the timing is off it well cause the vale to open at the roung time and let fule in your cat and that will cause the cat to heat up u could melt the cat witch will cause the exhaut to go back up it to the engin witch will create the knock sound