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post #1 of 50 (permalink) Old 12-12-2007, 02:03 PM Thread Starter
 
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Help, please...and thank you!

I bought my SC about a month ago, and I knew it needs work. But I had it checked by a mechanic today to see if the previous owner was right about what he told me was wrong with it..he said it needs a egr valve, thats whats throwing the misfire.

Well, the shop told me that the egr valve wouldn't cause it, and I've been told by friends that it could cause the misfire, because the vacuum hose could be carbon blocked....

Then, I find out by the shop that I have a spun bearing in my supercharger...how can I tell, should it act funny? And how much is that to get fixed, generally? I have a spare supercharger in my garage that I could use, I would just like to see what kind of a ballpark figure on that.

Thanks for any help in advance!

Last edited by Karlen; 12-12-2007 at 02:18 PM.
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post #2 of 50 (permalink) Old 12-13-2007, 10:25 PM
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If you have a spare supercharger, just swap that one on, it will be cheaper and easier than replacing the bearings in the one you have. Either that, or you could get a blower from magnum powers and step up the power quite a bit.

As for the EGR causing the misfire, it is possible, but highly unlikely. In theory, if the EGR comes on when its not supposed to, it could cause the engine to miss, but it would only miss at idle, and as the rpms went up, it would be perfectly smooth, but just down on power. The EGR tube being blocked with carbon won't cause a misfire, it would just cause the EGR valve to not put any exhaust gases into the intake, which would be like not having EGR at all. I would first check the plugs and wires, and maybe do a compression test on it to track down your misfire.

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post #3 of 50 (permalink) Old 12-14-2007, 01:25 PM Thread Starter
 
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Thanks man, will do.

Do you know about how much it would cost to fix bearings in my blown supercharger?
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post #4 of 50 (permalink) Old 12-14-2007, 02:27 PM
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Replacing the bearings is basically part of a complete blower rebuild. Most likely, if you could even find a shop willing to do it, it would cost more to have your blower rebuilt than to just buy a rebuilt one. Or the other option is to do it yourself. There really isn't anything to a blower, just pull it apart, replace the bearings, and put it back together.

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post #5 of 50 (permalink) Old 12-14-2007, 09:18 PM
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I would like to know what it was doing that they suspect a spun bearing.
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post #6 of 50 (permalink) Old 12-14-2007, 09:27 PM Thread Starter
 
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To me, it was nothing abnormal, but keep in mind it also has a misfire..so I have a couple things I need to do a better diagnosis on. Hopefully thats just a bad spark plug/wire and can be easily fixed.

I just wish I could tell if the supercharger in my garage is working so it can go on my car...fingers crossed..
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post #7 of 50 (permalink) Old 12-14-2007, 09:54 PM
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The blower will tell you if it's on the way out. They tend to get louder. If it's nice and smooth to turn makes little to no noise (not with your foot in it) no excessive play, I would say it's probably ok.

As for the miss. Do start simple. Is it a constant miss or a every once in awhile drop off?

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post #8 of 50 (permalink) Old 12-14-2007, 10:33 PM
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hey carlen good luck with the sc. I was the one you met at the amaco you work at. I have the silver sc.
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post #9 of 50 (permalink) Old 12-15-2007, 03:23 AM Thread Starter
 
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Originally Posted by thunderbird96 View Post
hey carlen good luck with the sc. I was the one you met at the amaco you work at. I have the silver sc.

Ya, I remember you man..

The car is kind of rough at idle, then smooths out, then rough again at about 2100rmps to about 2700rpms, then smooths out again..I was driving it the other day and got above 2700 in 2nd then went WOT and the darn SC hiccuped right before I went to shift...then a couple hours later after about two miles of WOT it died, wouldn't start, then finally did and the SC was making a horrid noise....There is a cable you can pull on the back of the SC, and when my friend did that, it didn't do anything but make a low choking noise..
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post #10 of 50 (permalink) Old 12-16-2007, 03:09 AM
 
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Thats the throttle cable....
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post #11 of 50 (permalink) Old 12-16-2007, 11:07 AM
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Originally Posted by Karlen View Post
Ya, I remember you man..

The car is kind of rough at idle, then smooths out, then rough again at about 2100rmps to about 2700rpms, then smooths out again..I was driving it the other day and got above 2700 in 2nd then went WOT and the darn SC hiccuped right before I went to shift...then a couple hours later after about two miles of WOT it died, wouldn't start, then finally did and the SC was making a horrid noise....There is a cable you can pull on the back of the SC, and when my friend did that, it didn't do anything but make a low choking noise..
Horrid like a rattle?
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post #12 of 50 (permalink) Old 12-16-2007, 05:26 PM Thread Starter
 
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The noise is more like a pulley gone nuts, screeching..the car died the first time it did it..then I got it started about 10 min later, and it made it back home. Then parked it, and my friend pulled on the cable on the back of the SC (No, its not the throttle cable) and it didn't do anything. My friend said it's supposed to do something, I assume make boost?
I'll try to get a video of what it's doing tomorrow after I get off work. Might be able to help, I was just upset that it happened and can't remember much.
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post #13 of 50 (permalink) Old 12-16-2007, 05:33 PM
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I think they are pulling on the bypass valve to open it at idle. If that is the case, then no it won't have any effect at idle, and it also doesn't tell you anything about what is wrong with the car. If you want to determine for sure if the noise is in the blower, take off the belt. The car will run fine without the blower belt on, and if the noise goes away doing that, then you know its in the blower. If you pull the blower belt off, and you still have that noise, then it is coming from something else, possibly one of the front accessories. If the noise goes away with the blower belt off, it could still be one of the tensioners, or the jackshaft pulley. Usually when a blower bearing goes out, it will make a moaning/grinding sound. What you are describing sounds like something else.

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post #14 of 50 (permalink) Old 12-16-2007, 05:39 PM Thread Starter
 
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Thanks man, I will give that a shot tommorrow. I would like to get it running smooth before I leave for basic training, it will be sitting for 3 months and I'd like to be able to drive it when I get back..any idea's on the rough idle at certain rpm's, besides having my mechanic diagnos the misfire cause?
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post #15 of 50 (permalink) Old 12-16-2007, 08:48 PM
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Thanks man, I will give that a shot tommorrow. I would like to get it running smooth before I leave for basic training, it will be sitting for 3 months and I'd like to be able to drive it when I get back..any idea's on the rough idle at certain rpm's, besides having my mechanic diagnos the misfire cause?
If you get a chance, do a WOT run and see if it misfires during that. I had the same symptoms as you, but it also misfired during WOT. Fix? Turned out two wires were arcing, and one spark plug had a nice crack in the porcelain.

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post #16 of 50 (permalink) Old 12-18-2007, 12:54 AM Thread Starter
 
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When I had it running before the SC really started to go, I did run WOT, and right before I shifted into 3rd gear, the SC dropped from 10psi to 3 or so, while still on the throttle, and the Check Engine light kicked on...

I was hanging out with friends after work today, I'll get around to the vid and pics tomorrow.
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post #17 of 50 (permalink) Old 12-18-2007, 12:56 AM Thread Starter
 
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The codes it threw, my friend has at his shop, he just hasn't gotten back to me on what they were. I'll try to get that too. Would probably help here....
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post #18 of 50 (permalink) Old 12-18-2007, 10:36 AM
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You bought a high mileage car that has a misfire.

Did you try sparkplugs and wires? Thats _Always_ the first place to start. Gap them correctly.

Your blower dropped from 12psi to 3 psi.... First thig's first... Is the gague accurate? (Did you notice a change in noise and engine power)

Two things can cause that - Something dragging down the blower, and the belt just slipping on it (Not very likely) or the bypass valve opening.

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post #19 of 50 (permalink) Old 12-18-2007, 09:09 PM Thread Starter
 
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The engine definitely dropped off too, wasn't just the blower. I'll check on the pulley and belt though, thanks for the help.

The previous owner said he had the motor rebuilt, and new plugs and wires put in, along with a new MAF, Coil Pack, coolant sensor (I can't remember which exact part of the cooling system) and it needed an EGR valve to fix the misfire...but a shop told me egr was fine. So I'm just waiting on my mechanic friend to have time to check it all out for me.
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post #20 of 50 (permalink) Old 12-18-2007, 09:32 PM
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Missing. Plugs and wires. But if the blower is acting up and boost is all over the place (see squeal below) the car would run strange.

Squeal. I might guess the blower is freezing up and that is belt squeal you hear.

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post #21 of 50 (permalink) Old 12-19-2007, 08:33 AM
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Missing. Plugs and wires. But if the blower is acting up and boost is all over the place (see squeal below) the car would run strange.

Squeal. I might guess the blower is freezing up and that is belt squeal you hear.
I agree with this post. Just changed the spark plugs and wires.

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post #22 of 50 (permalink) Old 01-02-2008, 11:00 PM Thread Starter
 
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Picked up a new supercharger.

Anyone have any how-to's to install the new one?
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post #23 of 50 (permalink) Old 01-02-2008, 11:12 PM
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remove bad one, install good one :-P

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Red Green, is that you? Might consider looking into fabbing an intake setup that isn't so, well, ghetto.
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post #24 of 50 (permalink) Old 01-03-2008, 01:28 AM Thread Starter
 
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remove bad one, install good one :-P
Lol, after I posted that I hit myself in the face.

Anyone have pics from when they did it, or any good suggestions of things I should do while I have it off, or check ups on other parts?
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post #25 of 50 (permalink) Old 01-03-2008, 06:06 AM
 
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It sounds to me like you have a spun bearing in the lower end of the engine. Not an uncommon problem as I have 3 here with the same problem. And just for the record, an EGR valve can cause a misfire like sensation, but I doubt that is what you have going on.
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post #26 of 50 (permalink) Old 01-03-2008, 02:35 PM Thread Starter
 
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It sounds to me like you have a spun bearing in the lower end of the engine. Not an uncommon problem as I have 3 here with the same problem. And just for the record, an EGR valve can cause a misfire like sensation, but I doubt that is what you have going on.
Will it be easier to check on that egr valve/vacuum hose to it while the supercharger is off?
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post #27 of 50 (permalink) Old 01-03-2008, 06:03 PM
 
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The vacuum hose would not be cabon blocked, the carbon buildup would be in the intake elbow. But like I said, it sounds like you have a spun bearing in the lower end of your engine. The best way to eliminate the acessories would be to remove the belts and then start the car. If the noise is gone, you need to start checking all of the belt driven accesories. If the noise is still there, you need to stop running the engine as the more the car runs, the more damage is occuring.
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post #28 of 50 (permalink) Old 01-09-2008, 04:27 PM Thread Starter
 
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I got GM supercharger fluid, since it's a lot cheaper than Ford's. Now, how many fluid ounces do I need? I have 4, but I can always get more, I guess. Also, on the top of the supercharger where it connects to the intercooler tubing, does that have a gasket, it kinda looked like its supposed to but Orielly's and Advance did not have one listed. Any help, thanks.
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post #29 of 50 (permalink) Old 01-09-2008, 05:04 PM
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Open the screw and fill it up until it starts dripping out.

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-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
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post #30 of 50 (permalink) Old 01-09-2008, 07:40 PM Thread Starter
 
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Open the screw and fill it up until it starts dripping out.
Figured thats how you do it.

Any idea on the gasket on top of the supercharger?
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