Rep Power: 0

I have a 2001 Manual Honda Civic Ex. It has 64k miles on it. It works like a charm. Never had a problem with it. All of a sudden about 5k miles ago I start hearing this sound. It only happens when the car is in gear and in the RPM range 3,500 through 3,800. It sounds like a rattling noise. When I rev my engine through that range and I am not in gear I dont hear the rattling noise. It only happens when I am in gear. It happens in all gears also. It is more noticible when I slow down (by braking, not using the engine and gears) and the car is still in gear. I am not sure what it is. What could it be? If you need more information I will be happy to provide it for you guys.

Thanks again in advance,
Oren

 
Rep Power: 512

i got that crap too.. is it sound like its coming from under the dash? i dont know what it is but i'm about ready to rip my dash off and secure everything that has potential movement...

 
Rep Power: 812

Well mine was actually a rattle coming from the engine. I swapped the cylinder head and it went away, but you could also try using 89 instead of 87 gas and changing the plugs. Also try some greased lightning brand fuel system treatment.

 
Rep Power: 0

I will drive it around today and try to pinpoint the exact area where I think the sound is coming from.

The wierd thing is:
1.) It ONLY happens while I am in gear. If I rev my engine while parked though that RPM range nothing is heard.
2.) Sound ONLY happns in that RPM range. No other range.

Thanks,
Oren

 
Rep Power: 0

I already tried Penzoil and Lucas Fuel System Cleaners any they didnt work. I am also trying an Auto-RX cleaning but that doesnt seem to help either.

Thanks,
Oren

 
Rep Power: 0

Checked the spark plugs and they look perfect. They were also gaped correctly when I checked them. Additionally , I removed my header heatshield and the sound still occured.

Thanks,
Oren

 
Rep Power: 812

I still have the rattle I think you're talking about. It actually happened after the head swap, so I thought it was something loose. Can't figure out what tho. It also seems to go away once it gets warm.

 
Rep Power: 812

Okay, I may have found a solution. Do you have a neuspeed strut bar? Mine was hitting the R134A refrigerant hose and causing it to vibrate. I put some soft foam between it and the sound went away I think. It could also be the hose touching the hood if you don't have the bar installed.