i think the car is surging but not sure - Page 4 - 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 10-22-2009, 04:09 PM   #31
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i went back out and checked the arm, now the fist time i done this i disconnected the vac line that was on top (front) of the BCA and that vac line didnt go to the BCS it went to something on top of the supercharger, but this time i done as you asked and disconnected the vac line that goes from the BCA to the BCS, now, that vac line comes off the BCA at the bottom (rear). when i did it as you ask me too the actuator didnt drop (extened).
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Old 10-22-2009, 04:10 PM   #32
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oh when i took the car for the drive i had the top (front) disconnected and the actuator was extened.
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Old 10-22-2009, 04:25 PM   #33
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I'm sitting at my desk and can't look at my car, so I might have the hoses mixed up. The key is to have the arm on the BCA fully extended when you take it for a ride, and plug any open vac hoses. This will put your car into full boost. When you do a petal-to-the-metal accelerations the boost gage should go to the top.

Tell me how that compares to what you did, and maybe try it one more time. If this doesn't work we will have to get Danthurs back on. He knows more about this than I.
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Old 10-22-2009, 04:31 PM   #34
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i would like to thank you for all the time you have spent with me on this problem and i really aperreciate it. im not quite shure what you mean by the boost gauge should go to the top, my gauge starts at -70 moves up to 0 and continues down to +70 my needle goes up past 0 and keeps on going to +17.5 but wont go past that.
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Old 10-22-2009, 04:45 PM   #35
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I'm sorry, I meant the needle on the boost gage should go all the way to the top when you have the actuator arm fully extended and a WOT acceleration.

When you remove vac hoses so the arm is fully extended is the engine running, or off? We need to get it so the arm is fully extended with the engine running.
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Old 10-22-2009, 05:11 PM   #36
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i think i might be confusing what you are tring to tell me so lets make sure i`m on the right page. my boost gauge is in the shape of a half moon, the top of the half moon is `0` the right bottom side of the half moon is `-70` and the left bottom side of the half moon is `+70` so when i go WOT with the vac. line disconnected and the arm fully extended the needle goes from `-70` up past `0`and down the other side towards `+70` it stops at `+17.5` is the needle supost to go to `+70`
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Old 10-22-2009, 05:15 PM   #37
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It should go almost all the way to +70 with the BCA arm fully extended and a WOT acceleration. Back to your earlier description, it should go to the 3/4 mark or the 7/8 mark, not just to the 5/8 mark.
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Old 10-22-2009, 05:37 PM   #38
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i went back out and done it all again to make sure i was doing everything right as per your instructions.
this time when i told the car out for a run with the vac. line disconneted and then reconnected the result was the same.
the boost gauge went up to 3/4 for about 1 second and then dropped to 5/8 but it NEVER goes near +70
i would have to say at this point it all seems to be working but maybe the boost could be a bit higher
i wish i knew someway to get more boost but the car has 260,000km in it and i guess this is just part of it.
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Old 10-22-2009, 05:44 PM   #39
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No reason we can't get it running like new.

I would suggest you install a new boost control solenoid. Call the dealership, tell them you want to check availability, and get the part number. Then check around the auto parts stores in your area for the best price. You can also try online at rockauto.com.

This is a very easy part to replace.

Once that is done, tell us how the car peforms and we can decide what to do next.
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Old 10-22-2009, 05:47 PM   #40
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i live up in newfoundland and dont have a hole lot parts places at a cheap price but i'm coming to ontario for christmas maybe i can get it there. is it ok to drive the car that far with it like this. and is there any other thing it could be.
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