weird grinding sound at high rpms. VERY annoying and loud

D15, D16, D17 and Mini-Me swaps
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weird grinding sound at high rpms. VERY annoying and loud

By doubskie
- Wed Dec 01, 2010 2:34 am #225303 d15b8 with intake and headers, NO oxygen sensor.

2 problems with it...

1. whenever it reaches around 4 rpms(not EXACTLY sure its 4. i dont have a tachometer but around there) theres a weird grinding noise coming from it seems like the passenger side of the engine.
ive tried checking where its coming from but i cant seem to find.
and its much quieter when your standing in front of the car than when your inside the car.

2. after its been running for a couple minutes and warmed up it has an idling problem. after revving it itll do a reall short shake every second or so. it does it about 4 or 5 times then the rpms drop a little bit and it shakes about half as much, but its constant. i adjusted the idle and set it up a little bit and it seemed to be idling a little better for about 100 miles and now its back exactly how it was

ill take a video tomorrow cause its dark right now but any help is appreciated.

thanks
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By Eg6H2D
- Wed Dec 01, 2010 3:08 am #225312 Is it an Auto or % Speed?. that will help determine an issue..

and ur idle might be due to you not having an O2 sensor. $40 bucks... get one.. you should have a check engine light on..
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By teal_dx
- Wed Dec 01, 2010 3:10 am #225313 why would you try and diagnose anything without an oxygen sensor? That tells your ECU if it is putting the right amount of fuel in your engine. Without an o2, you're running in limp mode (weak power) dumping excess fuel into your engine, running rich which will eventually cause other problems. Don't drive without an o2 sensor.

1. could the grinding be a vibration from exhaust or shift linkage?

2. sounds like a vacuum leak or you may have air in your coolant system. IACV could need cleaning as well.
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By doubskie
- Wed Dec 01, 2010 3:20 am #225316
EG6b20R wrote:Is it an Auto or % Speed?. that will help determine an issue..

and ur idle might be due to you not having an O2 sensor. $40 bucks... get one.. you should have a check engine light on..


it doesnt have anything to do with the speed because even if im in nuetral and rev it itll still grind.

and yes im aware that no 02 sensor is bad.
wasnt a purposeful thing to not have one. i had an ef i was selling, but i was slowly taking parts off it for my eg. i didnt have a plug for the stock manifold i put on the ef and unexpectedly sold it the next day.

so i guess ill get a sensor before trying anything else with the idling problem.

as far as the grinding...
definitely not the exhaust. i guess it could be the shift linkage..but i wouldnt guess it would be based on where its coming from
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By Eg6H2D
- Wed Dec 01, 2010 3:40 am #225326
doubskie wrote:
EG6b20R wrote:Is it an Auto or % Speed?. that will help determine an issue..

and ur idle might be due to you not having an O2 sensor. $40 bucks... get one.. you should have a check engine light on..


it doesnt have anything to do with the speed because even if im in nuetral and rev it itll still grind.

and yes im aware that no 02 sensor is bad.
wasnt a purposeful thing to not have one. i had an ef i was selling, but i was slowly taking parts off it for my eg. i didnt have a plug for the stock manifold i put on the ef and unexpectedly sold it the next day.

so i guess ill get a sensor before trying anything else with the idling problem.

as far as the grinding...
definitely not the exhaust. i guess it could be the shift linkage..but i wouldnt guess it would be based on where its coming from

I wasnt trying to say anyhting about speed. i was asking if it was 5 speed or auto.. but since u mentioned neutral im guessin 5 spd.. correct me if im wrong.
if u get a grinding issue while in neutral foot NOT on the clutch it caan be your throwout bearing meaning u need a new one but if your going to do that it comes with a new clutch. .. that's all i can think of right now..
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By doubskie
- Thu Dec 02, 2010 11:23 pm #225695 well i went to get an o2 sensor today.
i couldnt find any of the cx ones.
so i got a universal o2 sensor, with only one wire.
but my oem sensor had 4. so i have 2 black, 1 green, and 1 gray that i need to hook to a sensor.

any way i can make this sensor work?
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By teal_dx
- Thu Dec 02, 2010 11:37 pm #225700 No you need to get a 4-wire o2 sensor. I think they would have universal 4-wire ones too? I'd try to get the right one for your car, it's a pretty important sensor :thumb:

By Butterzz
- Fri Dec 03, 2010 8:56 pm #225827 D series trannies make grinding noises when the fluid is low or poor quality. Change your tranny fluid and see if it helps at all.

I usually put the new stuff in through the Speed sensor.
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By doubskie
- Wed Dec 08, 2010 7:36 am #226654 so i got an o2 sensor from pick a part.
its a 4 wire bosch, not sure what car but im pretty sure it should work

i checked which wires are suppose to connect to eachother (based on information i found online about 92-95 civic wiring AND the bosch 4-wire sensors), twisted each one together and turned the car on.
the check engine light is still on.
i figured it would turn off as soon as an oxygen sensor was connected to it.
even if it was not actually installed in the headers itself.

do i need to actually install it to see if it is working correctly? or is it safe to assume its not working correctly and i need to get a new one
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By chrono404
- Wed Dec 08, 2010 4:57 pm #226707 The o2 Sensor does need to be installed to your header to accurately read the exhaust. So yes it does need to be installed.

Also if your getting still getting a check engine light swap the two black wires on the o2 sensor. pull the 7.5amp fuse in your fusebox for a min or two and plug it back in, reseting your computer then try agian.

When you rev your engine, is your cluch pressed down? or is the clutch not being touched?

If it happens with the clutch down it could be a throw out bearing. If it happens when the clutch is not down and your in gear, then its more likely then not your main input shaft bearing. Its a common issue on 92-00 D Series Manual Transmissions.

The Throw out bearing is easy, basically remove the transmission and then just swap out the old one with a new one, if its the main input shaft bearing then your going to have to open your transmission up and put in a new bearing, We have a DIY article on howto rebuild your transmission if you want to try it yourself. Another option would be to get another Transmission and hope it doesn't have these issues.

If your car is an Automatic then the above doesn't apply.

Also what trim level is your Civic? Stock CX's come with a 1 wire o2 sensor, given the fact you have a 4 wire I would say your engine was swapped into a Different Trim Civic, all of which have a 4wire o2 with the exception of the VX(except in cali where it does have one >_>)
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By doubskie
- Thu Dec 09, 2010 12:17 am #226789
chrono404 wrote:The o2 Sensor does need to be installed to your header to accurately read the exhaust. So yes it does need to be installed.

Also if your getting still getting a check engine light swap the two black wires on the o2 sensor. pull the 7.5amp fuse in your fusebox for a min or two and plug it back in, reseting your computer then try agian.

When you rev your engine, is your cluch pressed down? or is the clutch not being touched?

If it happens with the clutch down it could be a throw out bearing. If it happens when the clutch is not down and your in gear, then its more likely then not your main input shaft bearing. Its a common issue on 92-00 D Series Manual Transmissions.

The Throw out bearing is easy, basically remove the transmission and then just swap out the old one with a new one, if its the main input shaft bearing then your going to have to open your transmission up and put in a new bearing, We have a DIY article on howto rebuild your transmission if you want to try it yourself. Another option would be to get another Transmission and hope it doesn't have these issues.

If your car is an Automatic then the above doesn't apply.

Also what trim level is your Civic? Stock CX's come with a 1 wire o2 sensor, given the fact you have a 4 wire I would say your engine was swapped into a Different Trim Civic, all of which have a 4wire o2 with the exception of the VX(except in cali where it does have one >_>)

about the sensor:
thanks that helps, ill just install it and then play with some wires.


the grinding:
it grinds when the clutch is not pushed in.
and i took a closer look at it. its pretty hard to tell, but it seems to be coming from the intake manifold area. maybe right below it.

i have a d15b8 that was completely stock when i bought it.
so i assume its a cx. because i dont see any reason why someone would swap a b8 in a dx, and if it was swapped it was done VERY cleanly.
so i really dont think its possible that it was swapped.
but i do have a 4 wire o2 sensor.
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