Knocking noise - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ALTRNTV · 02-20-2005, 06:57 PM

I was driving to LA the other day when it was raining and suddenly I felt something knocking from under my car. You could also feel it from under you. I slowed down and went to the nearest exit and pulled to a gas station. I was thinking my wheels were loose, so I tightened the lug nuts. Tight as can be. I went back on the freeway and it didn't do it anymore. I was going back home when it did it again. This time when it happened, it felt like I was losing power, I pressed the gas but the car didn't accelerate like it should. I again felt the knocking from beneath the car. It was scary. It never did this when it wasn't raining, only when it rains.

What's wrong??

It's a 96 s14 by the way.

idlafie · 02-21-2005, 12:41 AM

Quote:

Originally Posted by AkademikONE

I was driving to LA the other day when it was raining and suddenly I felt something knocking from under my car. You could also feel it from under you. I slowed down and went to the nearest exit and pulled to a gas station. I was thinking my wheels were loose, so I tightened the lug nuts. Tight as can be. I went back on the freeway and it didn't do it anymore. I was going back home when it did it again. This time when it happened, it felt like I was losing power, I pressed the gas but the car didn't accelerate like it should. I again felt the knocking from beneath the car. It was scary. It never did this when it wasn't raining, only when it rains.

What's wrong??

It's a 96 s14 by the way.

Stock intake or aftermarket intake? If aftermarket intake do you have a cold air extension on it? Did your Check Engine Light come on? What kind of tires are you running on your car? Do you have tread on them or not? How fast were you going when you heard the knocking noise? Was it constant only at one speed or varied with your speed?
There can be several dozen reasons for the cause of this problem. You're gonna have to give us more info...
ID
PS:
Almost forgot..."It never did this when it wasn't raining, only when it rains", you mean you've had this problem before?? if so for how long??

ALTRNTV · 02-21-2005, 03:02 AM

I have a regular Injen intake on, not the cold air. No CEL on. I'm running Falken GR-B FK451s and have 50% tread left. I was going around 60mph, it was when I was over 60mph when it happened, nothing at lower mph. What I meant by that is it never did the knocking noise before, when it wasn't raining. Now that it's raining here, it acts up on me. I drove on the freeway this morning when it was pretty dry and no noise. It's never happened to me before, just this week.

When the knocking sound came, I felt (or I think it was just in my head since I was scared) a loss of power, like the car wouldn't accelerate as usual.

The noise was coming from underneath the car. Scary stuff.

s13gonwild · 02-21-2005, 05:31 PM

you sure it wasnt a puddle splashing agaist the bottom of the car? LOL

drewtoes · 02-21-2005, 10:11 PM

dude! i was with twinkie in the car and this exact thing happend...we couldnt figure out wat the hell was going on. by the way, twinkie has an s13 fastbaCK w/ sr20, about 20% thread in the front wheels, and 10% IN THE BACK. (I KNOW ITS PRETTY BAD BUT WE HAD NO CHJOICE). but yeah, we jacked the car 3 times to check it and nopthing! it keeps happening on and off. felt like a cone stuck onder the car and we were dragging it. do you think it could be a transmission problem??

by the way it was also raining....it neverl happened before that, and when it stopped raining the car went back to normal.

ALTRNTV · 02-21-2005, 10:38 PM

Damn... yea, I also think it's a tranny problem.

papershot · 02-21-2005, 10:50 PM

haha, this also happened to me before, also when it was raining. only happened to me once though, hasn't done it for a long time. I had brand new ES100s at the time though, couldn't be the tires.

ALTRNTV · 02-21-2005, 11:10 PM

How long ago did it happen? I don't want to drive in the rain anymore.. haha.

drewtoes · 02-21-2005, 11:14 PM

IT HAPPENED LAST WEEK...but yea the car is fine now. and the noise hasnt returned but we are trying to figure out what it could be and hope it isnt gonna be bad in the long run...

Twinkie · 02-22-2005, 05:28 AM

yeah im twinkie. drewtoes and i - we were driving to santa cruz and the thing vibrated like crazy right under the driver's seat. felt like a little demon was right under the car trying to drill its way into my ass. "FUCK!" i thoguth to myself..."not another malfunction".

it was a hell of a night...i pulled over rigth on 17 half way to santa cruz, and checked under the car with a flashlight while the sky was falling down to my face, and i couldnt see a damn thing. fucking asshole weather makes everything harder...gAY man...

s13gonwild · 02-23-2005, 12:51 AM

omg its water hitting the bottom of the car.....it has NOTHING to do with your transmission. notice all of your problems are in the rain? it even happends to me...dont worry about it haha

ALTRNTV · 02-23-2005, 06:25 PM

Yea, but the knocking sound had a particular "tempo," as in the time between knocks was the same. I don't think water can have that rhythm.

02-20-2005, 06:57 PM	#1
ALTRNTV Post Whore! Join Date: Mar 2003 Location: Western Conference Posts: 9,429 Trader Rating: (0) Feedback Score: 0 reviews	Knocking noise I was driving to LA the other day when it was raining and suddenly I felt something knocking from under my car. You could also feel it from under you. I slowed down and went to the nearest exit and pulled to a gas station. I was thinking my wheels were loose, so I tightened the lug nuts. Tight as can be. I went back on the freeway and it didn't do it anymore. I was going back home when it did it again. This time when it happened, it felt like I was losing power, I pressed the gas but the car didn't accelerate like it should. I again felt the knocking from beneath the car. It was scary. It never did this when it wasn't raining, only when it rains. What's wrong?? It's a 96 s14 by the way.

02-21-2005, 03:02 AM	#3
ALTRNTV Post Whore! Join Date: Mar 2003 Location: Western Conference Posts: 9,429 Trader Rating: (0) Feedback Score: 0 reviews	I have a regular Injen intake on, not the cold air. No CEL on. I'm running Falken GR-B FK451s and have 50% tread left. I was going around 60mph, it was when I was over 60mph when it happened, nothing at lower mph. What I meant by that is it never did the knocking noise before, when it wasn't raining. Now that it's raining here, it acts up on me. I drove on the freeway this morning when it was pretty dry and no noise. It's never happened to me before, just this week. When the knocking sound came, I felt (or I think it was just in my head since I was scared) a loss of power, like the car wouldn't accelerate as usual. The noise was coming from underneath the car. Scary stuff.

02-21-2005, 05:31 PM	#4
s13gonwild BANNED Join Date: Jan 2005 Location: cali Posts: 466 Trader Rating: (0) Feedback Score: 0 reviews	you sure it wasnt a puddle splashing agaist the bottom of the car? LOL

02-21-2005, 10:11 PM	#5
drewtoes Leaky Injector Join Date: Jan 2005 Location: useless userville Age: 42 Posts: 59 Trader Rating: (0) Feedback Score: 0 reviews	dude! i was with twinkie in the car and this exact thing happend...we couldnt figure out wat the hell was going on. by the way, twinkie has an s13 fastbaCK w/ sr20, about 20% thread in the front wheels, and 10% IN THE BACK. (I KNOW ITS PRETTY BAD BUT WE HAD NO CHJOICE). but yeah, we jacked the car 3 times to check it and nopthing! it keeps happening on and off. felt like a cone stuck onder the car and we were dragging it. do you think it could be a transmission problem?? by the way it was also raining....it neverl happened before that, and when it stopped raining the car went back to normal.

02-21-2005, 10:38 PM	#6
ALTRNTV Post Whore! Join Date: Mar 2003 Location: Western Conference Posts: 9,429 Trader Rating: (0) Feedback Score: 0 reviews	Damn... yea, I also think it's a tranny problem.

02-21-2005, 10:50 PM	#7
papershot Zilvia Junkie Join Date: May 2004 Location: CT Posts: 368 Trader Rating: (0) Feedback Score: 0 reviews	haha, this also happened to me before, also when it was raining. only happened to me once though, hasn't done it for a long time. I had brand new ES100s at the time though, couldn't be the tires.

02-21-2005, 11:10 PM	#8
ALTRNTV Post Whore! Join Date: Mar 2003 Location: Western Conference Posts: 9,429 Trader Rating: (0) Feedback Score: 0 reviews	How long ago did it happen? I don't want to drive in the rain anymore.. haha.

02-21-2005, 11:14 PM	#9
drewtoes Leaky Injector Join Date: Jan 2005 Location: useless userville Age: 42 Posts: 59 Trader Rating: (0) Feedback Score: 0 reviews	IT HAPPENED LAST WEEK...but yea the car is fine now. and the noise hasnt returned but we are trying to figure out what it could be and hope it isnt gonna be bad in the long run...

02-22-2005, 05:28 AM	#10
Twinkie Zilvia Member Join Date: May 2004 Location: Santa Clara Age: 40 Posts: 258 Trader Rating: (0) Feedback Score: 0 reviews	yeah im twinkie. drewtoes and i - we were driving to santa cruz and the thing vibrated like crazy right under the driver's seat. felt like a little demon was right under the car trying to drill its way into my ass. "FUCK!" i thoguth to myself..."not another malfunction". it was a hell of a night...i pulled over rigth on 17 half way to santa cruz, and checked under the car with a flashlight while the sky was falling down to my face, and i couldnt see a damn thing. fucking asshole weather makes everything harder...gAY man...

02-23-2005, 12:51 AM	#11
s13gonwild BANNED Join Date: Jan 2005 Location: cali Posts: 466 Trader Rating: (0) Feedback Score: 0 reviews	omg its water hitting the bottom of the car.....it has NOTHING to do with your transmission. notice all of your problems are in the rain? it even happends to me...dont worry about it haha

02-23-2005, 06:25 PM	#12
ALTRNTV Post Whore! Join Date: Mar 2003 Location: Western Conference Posts: 9,429 Trader Rating: (0) Feedback Score: 0 reviews	Yea, but the knocking sound had a particular "tempo," as in the time between knocks was the same. I don't think water can have that rhythm.