Stumbling, Surging, Hesitation ** FIXED ** - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-14-2008, 01:06 AM   #11
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NGK TR55s are what a lot of us here use. Platinum plugs are not handled well with supercharged cars. I use the TR55s with no problems at all and I run a supercharged 92.

Get a new O2 sensor. Bosch o2 sensors are horrible in our cars. I wouldn't trust its readings.

You did put a new o-ring under where the PVC valve is correct?

My supercharger makes noise as well. Loosen the belt so that the pulley moves freely. Is there any play in the pulley before you feel the guts connect and turn? This indicates a bad coupler. I am doing this job tomorrow actually. Coupler is $30. You'll need to take off your SC I believe as well as change its oil. Easy job though imo.
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Old 03-14-2008, 01:10 AM   #12
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really? buy another NEW o2 sensor? i just bought this one for 25 bucks !!

also. replace the patinums that i just spent 30 bucks on LOL

Hey if that fixes it, then im sooo down to do it.. but really?

I need a new coupler for sure.. but need to get more info.

Cant loosen belt.. the tensioner takes care of that ( its brand new too )

AND NO.. NO O RING UNDER THE PCV VALVE.. IT WAS KIND DARK OUT, BUT I DIDNT SEE ANY O RING AND I JUST PUT THE NEWPCV VALVE IN UNDER THE SPRING, PUT THE TOP BACK ON, AND THATS IT... NOW IT MAY BE IN THERE AND I DIDNT SEE IT.. BUT I DONT THINK THERE WAS ONE.....
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Old 03-14-2008, 01:13 AM   #13
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With your problem its hard to say. I know it sucks going back and forth with parts lol. You can find quite a bit of information as to why bosch is a bad brand of o2 sensor for us.

TR55s should be under $2 each.

O2 controls gas input so its a potential cause, platinum plugs well...plugs control ignition; making it also a possible cause. Up to you with what you want to do. Maybe someone else can chime in on whether to replace it or not.

You can loosen your belt. I believe the bolt on the tensioner is a 15mm. Push down on it to release the pressure from the belt. You can then turn the sc pulley.

The O-ring on the PCV is beneath it if I remember correctly. Your new one should of came with an o-ring.
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Old 03-14-2008, 01:16 AM   #14
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IM GONNA TRY and return the o2 sensor, used for about 2 miles.. i think i can pull it off and return. Gonna get another brand..

I will find the NGK'*.. and install them too..

Then i will report back... what about the o ring?
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Old 03-14-2008, 01:22 AM   #15
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When I bought the PCV valve it came with an o-ring. I took my old valve off and found an o-ring right below it. Shine a flash light down there with a small flat head screwdriver and poke around.

Other have bought bosch o2 sensors and didn't have your problem. Your problem is a first to me so if they don't replace it then hold off on buying a new one.

Personally with hearing bad things about platinum plugs and supercharged cars I wonder if those may be causing your problem. Since it only happens with boost...

TR55s aren't all that much money. I would start there if you are to buy anything.

Hmm I also wonder if you have a clogged cat. Get under your car and kick/hit your cat. Feel free to use some pressure. If it rattles its bad.
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Old 03-14-2008, 01:34 AM   #16
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i am very interested in what you are doing tomorrow ( coupler ) IF YOU TAKE METICULOUS NOTES ( a ton of pics, of the whole process, part numbers used, THE WHOLE NINE ) i AM WILLING TO PAY YOU. I kid you not. if you supply with me with ALL of the info i need I would be more than willing to pay you. PLEASE. !

Coupler part number ( all o rings/ gaskets )

and a STEP by STEP process ( socket sizes, order of procedures ) LIKE I MEAN break it down Barney style... how;* the 30.00 your parts cost sound?

Let me know please.

will check oring under pcv tomorrow in am
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Old 03-14-2008, 01:40 AM   #17
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lol I know how it is having problems with a bonne Make sure your coupler is the culprit though. Check your pulley for play by putting a wrench/ratchet to the tensioner to loosen the belt.

Since you asked, I will take pictures the best I can and document the process free of charge. I'm not going to charge you any money simply because I would appreciate someone doing the same for me. All I ask is that you do the same for someone else somewhere down the line. I only consider this job rather easy because I had the SC apart before to rebuild the nose drive, and was holding the bad coupler in my hand at the time. I didn't know it was bad though

http://rollingperformance.com/scoil.htm

First picture is the coupler. It has 6 holes. 3 metal rods from the nose drive go into one side, and 3 rods from the "propellers" from the inside go into the other 3. Over time the holes wear and become an "oval" shape thus giving you play. I have read that even the slightest bit of play can cause noise. My noise is a loud rattling sound coming from the middle, bit closer to the pulley of the SC. Lower the RPM the louder it seems to be.
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Old 03-14-2008, 01:42 AM   #18
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Quote:
Originally Posted by Arakor
Personally with hearing bad things about platinum plugs and supercharged cars I wonder if those may be causing your problem. Since it only happens with boost...
No platinum plugs in a supercharged engine. Use copper. Dont recall what year you have, 1995 to 2003 would use Autolite 605

(edit) I see you have a 93, just ask for the correct autolite plug.
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Old 03-14-2008, 01:55 AM   #19
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i need to do the nose drive too i guess? I want the SC working top notch. what did the nose drive entail?

Thanks for ALL of your help.. ok ok ok platinums are goiing bye bye !
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Old 03-14-2008, 02:00 AM   #20
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Oh I would think not. I was driving and my SC pulley started to rotate crooked and the belt came off. It wasn't fun.

The job entailed about $100 with me and my dad doing the job. He is a machinist so we had everything we needed. Essentially you have ball bearings inside the nose drive. Mine were torn apart. I found pieces of the bearings in the drive.

So you change the SC oil, replace the bearings and you must actually machine press the shaft to the pulley I think it was. Either way its a big job. Doing the coupler and changing the SC oil (which you have to do with a coupler job anyway) should be just fine for you.
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