My friend car, a 2001 civic EX D17a2 engine is knocking, but only when the motor is hot, and only between 2000rpm and 3000rpm. The engine is not knocking under load, only if you press the gaz pedale a little and you keep the same rpm.

When the car is cold there's absolutely no knocking sound. He put 10W30 oil instead of 5w20.

The oil pressure light doesnt stay on more than half a second when he start the car in the morning.

What is wrong?

Update Video: http://s139.photobucket.com/albums/q...t=100_0061.flv

 

How many miles are on the car? He may need to adjust his valve lash.

 

around 160 miles

 

My F22 engine does the same thing. I've found that rod #3 is bad. Unplug the plug wire for each cylinder and rev if knock goes away. You have a bad rod bearing

 

160 miles? Do you mean 160,000?

 

yes 160 000

 

+1.

 

if its the problem, how long the motor will last?

 

not long
trust me

 

You can try putting 10w-30 if 5w-30 is already in there that will help but with out hearing it I'll say stay away from long highway trips or highway at all

 

to be completely honest, if its a rod bearing going out, dont even start it, that way ou can prevent it from seizing up or blowing!!

 

that is spark knock (aka. detonation which can lead to rod knock if not taken care of) not rod knock. if the rod bearing is bad it will continue to make noise even if you disconnect one of the coil packs cause it won't stop the rod from going up and down while the crank spins



as for driving the car listen to ej8ster96 he is completely right don't drive the car at all if you need to limp it home and start looking for a new motor. Luckily you can pick those motor up for as low as $150 but usually $300-500

and the reason the car does not make noise when it is cold or when there is thicker oil in is cause when oil is cold it is thicker and thicker oil reduces more sound you could probably drop 50w oil in and not hear a thing. I would drain the oil through a screen or a coffee filter and start looking for copper shaving in the mix

 

thats foto

 

Then what would be causing the spark knock to occur? I have new spark plugs and new wires. The rotor and cap are oem brand but not orginal. I used 93 fuel and still had the problem. My egr was cleaned out about 15k ago. My compression is perfect, my injectors are working right. The plugs are all the same color. Now would a injector cause the this if it weren't firing right. The knock occurs when warm to hot engine and seems to alway be there just not at idle. If you rev it with the hood open you here a very audible knock. Not to mention the vibration I experience at 3k when hot or cold. Any ideas????

 

rotor and cap? the d17a2 does not have a distributor it uses coil packs.

what type of spark plugs do you have in the car?

and it sounds to me like you have rod knock not spark knock. which can be caused from oil starvation, detonation, or oil degredation(oil does not get changed and breaks down essentially does nothing after a while)

 

spark knock? you missed the whole point of that statement. removing the spark plug removes pressure from the cylinder, no pressure=no load=no knock.

 

^you will still get knock even if you take the plug out and remove the pressure off the cylinder due to the rate it is spinning at especially with the way these block flex. it's an infective test to determine rod knock

 

You can also get a commercially available filter cutter and cut apart your oil filter to see the metal and other contaminants the filter has trapped. Sending an oil sample to an oil analysis lab is inexpensive, under $25 Canadian per sample, will tell you what debris and contamination there is in you oil that cannot be seen with your eyes.

 

I put a video!

 

that sounds like spark knock to me check your map, cam and your crank sensor. and what spark plugs are you running certain brands of spark plugs even though they are sold for this car do not work

 

im running ngk, and they are the right one. I check all 4 spark plugs today and they are perfect, color and shape. I dont know what to do now..

 

like stated before it wont last very long....maybe a day or two? atlest thats how long mine lasted before the motor locked up. (d16y8)

So be honest with me...what was said "friend" doing?

Was he low on oil?

Or was he staying in high rpms casue he was driving like Dom on the F&F?

 

i had something like this happen to me it might be a broken motor mount

 

OR take the drain plug out your oil pan and drain all the oil (if there is any) Look at the end of the treaded protion of the drain plug, there will be/should be a magnet, and look for metal shavings

 

but now it been a week with this sound and the motor still run perfectly except the sound lol.

My friend dont drive like a dumb, the oil was castrol gtx, keep in mind the motor have 160 000 miles