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 FAQ: Supercharger Noise (Bad Coupler)

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ZEP
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 16, 2008 4:07 pm

Hrm, didn't even think about the cat. I just replaced the wires today. The car did not hesitate on my way up to work today. But another problem arose. When leaving, I started the car up and backed up, and suddenly, I could feel the car shaking pretty badly and I only accelerated in short bursts with my foot on the gas.

I immediately pulled over into another parking space, the tach fluctuating from about 600 rpm to up to around 1500-1600 at idle, and I opened the hood and the supercharger and engine were shaking visibly. I turned the car off, then turned it on another time. Same thing happened. I turned it off and on a third time and the motor started shaking again.

I waited about 30 minutes before trying to start it again, and when I did, it started perfectly fine and though I know I probably should have called a tow truck, I drove all the way 35 miles home with absolutely no problems. It was the strangest thing. Now, I have absolutely no idea what the problem was. Anyone have a clue, or need more info?
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 16, 2008 7:48 pm

Being that you replaced the wires only a day ago, my money is on the wires either not fully connected to a plug or coil, or you crossed a wire. If it's intermittent, they're probably not crossed. Try twisting and pushing each wire boot onto it's plug. Wear gloves and push hard. Check the coil terminals that all connections are good. Twist and push each wire to be sure.

It's also possible you have a bad coil. If you don't solve the problem, and you are sure the wires are not crossed, try checking or replacing the coil packs.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 16, 2008 7:49 pm

recheck that all the plugs are tight and wires are connected well
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 16, 2008 8:31 pm

Yeah, I already messed with the wires, made sure they were fully in the plug and the coil. That's what I did right before I started it up the final time and it started running good. That was most likely the problem, because it hasn't happened again and I've started it 3 times since last posting on here.

Thanks for the help though, if it happens again, I'll replace the coils. Are OEM coils recommended?
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 16, 2008 8:33 pm

Yes, OEM coils are just fine.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Aug 23, 2008 10:11 pm

One final question before I let this thread rest. If anyone can give any more words of advice, that'd be great. Btw, I have not replaced my coils.

Went to the mechanic today because my car's still doing its hesitation thing. What it's doing is sort of a combination of things. In one instance cruising at 55-70, I put my foot on the gas about 50% and the tachometer needle started... bouncing up and down, which was reflected in the way the car moved, felt like something wasn't turning over right or something. Very strange.

Also today (I drove about 100 miles at higher speeds), putting my foot on the gas (not all the time) would yeild little response in acceleration, if any at all. I've heard this is a symptom of a clogged cat as well.

So I went to the mechanic today and ask him about it, he tells me that if my cat was clogged, the SES light would show. I'm assuming that's accurate, but if it's different or something with the Riv then that'd be great to know. He also said that it might possibly be the computer being unable to regulate fuel or something correctly to match what kind of pressure I give to the pedal. He also said the fuel pump might be going out.

Knowing very little mechanically about these vehicles, it's hard for me to say "let's do this over this" or whatever, so just wondering if anyone has any more thoughts on this problem. It's not really a question of hesitation anymore... more of just a weird lack of response type of thing.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sun Aug 24, 2008 5:17 pm

ZEP, your description of the tach needle swinging wildly really makes me think it's a coil. I''ve read this exact same symptom from a 3800 SC that had a loose coil connection.

You can have coils tested, I believe it's easy with the right tool, shouldn't cost much to do. I would go that route rather than assume the cat is bad. It may throw a code, or it may not, depending on what the problem is. In your case, since your problem seemed to happen all-of-a-sudden, I don't think it's a clogged cat.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sun Aug 24, 2008 7:55 pm

Coolness. Thanks.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sun Aug 24, 2008 8:27 pm

i had almost the same problem with my GP GT, but it was very intermittent and the tach would jump, the car would hesitate, and eventually cut off at highway speeds and sometimes while coasting to a stop light. but it was my electronic throttle control.
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PostSubject: Coupler Question   Wed Sep 10, 2008 10:00 pm

How can you tell if your coupler is going out? The car seems fine at idle and under light accleration but when you bunch it hard you can hear a noise liker gravel and you can feel it as well. Would this be the coupler?

Placed in wrong area please move.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Wed Sep 10, 2008 10:37 pm

Read through all of this thread - should clear things up!

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Wed Sep 10, 2008 11:05 pm

I read through all of that and it seems the coupler causes noise at idle? When I test drove the car in June I took it to the dealer and they looked it over and said the sc bearings and all were just fine that was less than 500 miles ago. The car does not make a noise at idle. Only when you give it a lot of throttle does it make a louder gravelly noise.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Wed Sep 10, 2008 11:19 pm

I don't think it's the coupler, but how do you know it's the supercharger? Describe the noise in more detail, and when exactly does it occur? Anything else not right with the car?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Thu Sep 11, 2008 6:26 am

I will try to take a video tonight with my camera.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Thu Sep 11, 2008 8:20 am

Coil. Coil. Did I say coil? Yes I meant coil.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Thu Sep 11, 2008 7:16 pm

I feel very very stupid. It is nothing to do with the SC I am pretty sure. Noise is only there when gear is in gear. But I turned the radio down and paid better attention noise is also made when at a stop and wheels get turned only softer. The car runs beatiful in my opinion.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Fri Sep 12, 2008 7:37 am

Im assuming you mean when the brakes are applied lightly, whens the last time you checked your rotors for warpage, and or defects like gouges etc?
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Fri Sep 12, 2008 7:00 pm

Also try turning off the motor and disconnecting the accessory belts one, then the other. Your noise might be the alternator (makes a racket when the bearing goes bad), the power steerng pump, the AC compressor or one of the idler pulleys.

However, noise in gear makes me think you have a crapped out motor or tranny mount.

One way to guess that without crawling under the car - get someone else to work with you on this. Open your hood, set park brake, start engine. Step on the brake (hard) and blip the throttle (that is, tap the accelerator pedal to race the engine a little). If the engine moves about in the engine compartment (it should not move much) you probably have a bum mount. I used to know how much movement indicated a bum mount but I don't any more. Maybe an inch or 2. Would any of you that know please chime in?

Albertj
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Fri Sep 12, 2008 9:16 pm

In park or neutural noise is not there but in gear nosie is their. Here is a video of the cars idle. Does the supercharger sound good from what you can hear? Noise is also worse when accelerating. Maybe this is no longer the right topic for this either.

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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Sep 13, 2008 12:38 am

Your video does not help me understand the problem; however one thing that occurs to me is that you should get an allen wrench and check the oil in the supercharger. Please check in again once you're taken some of hte suggested actions to see what the problem might be.

Albertj
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sat Sep 13, 2008 10:49 pm

I checed the oil in the supercharger and it appears to be fine. The video wasnt really intended to help with the problem but to see if anyone thought the supercharger sound to have a issue. Would I be right in saying if it was the supercharger it would do it all the time not just in gear? After looking more the motor does seem to move a bit when the car is placed in gear. Also the noise is not made in reverse.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sun Sep 14, 2008 1:01 am

What brand of belts are used on the accessory and supercharger belts? The Dayco PolyCogs and Goodyear Gatorbacks can whine like I hear on your video. Not a big deal.

Albertj
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Sun Sep 14, 2008 2:02 am

The belts on the accessorys are oem. They were replaced at the dealer by the previous owner at 110k that car now has 130k. Earlier Albertj had mentioned a motor mount problem. I have notice the motor does seem to move a bit when car is placed in gear.
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PostSubject: Noise coming from Supercharger   Thu Nov 27, 2008 2:24 am

Hey guys, I noticed a kind of clunk from my supercharger. It isn't very steady, but it is noticable. Could this mean I need a new supercharger coupler? And if so, how do I replace this. Thanks in advance, and sorry for the vauge discription. Thanks.
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PostSubject: Re: FAQ: Supercharger Noise (Bad Coupler)   Thu Nov 27, 2008 2:05 pm

Take the S/C belt off and try to wiggle the pulley. If it moves more than an eighth of an inch you probably need a new coupler. There's a couple of ways to do it. Here's the write-up on how to do it by just removing the snout http://www3.sympatico.ca/aepa/blowerinstall.html
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