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99 Seville STS
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31 Posts
Discussion Starter #1
Hi everybody! (Hi Dr. Nick!)
I just bought a 99 sts with 127K miles. I am learning a lot about this car as I go, but I was hoping to get some help on a few puzzlements that have popped up.

First, Sometimes it will have decent low end power and will at least squeal the tires and chirp going into second, and sometimes it wont. Mostly it feels really lacking on the low end. The Traction control is on. It will almost feel like a turbo kicks in at a higher rpm. (Keep in mind I live at 6,000 ft above the ocean.) I was wondering if the "turbo lag" is normal, or if it's time for a tune up and TB cleaning.

Second, I know that a passive suspension is much less expensive. But, all the literature makes such a big deal of the active suspension. If the price were the same which would you prefer? By-the-way, is the load leveling compressor connected to the suspension? In other words, is the compressor needed to make the suspension work?

Lastly, I know it's the deadest horse here, but I believe the general concensus is to leave the air intake alone? All stock, no K&N drop-in filter or anything, right?

Thank's so much for any help.
 

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White Diamond '03 DHS (with DTS floor shift)
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87,119 Posts
In other words, is the compressor needed to make the suspension work?
The compressor is needed for the ELC (Electronic Level Control) only. It pumps up the rear shock to level the car.

Lastly, I know it's the deadest horse here, but I believe the general concensus is to leave the air intake alone? All stock, no K&N drop-in filter or anything, right?
Correct. The factory set up will handle all the air that the Northstar can swallow at WOT @ 6500 RPM without restricting it.
 

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2005 Deville Base, 2004 Escalade AWD
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275 Posts
Hi everybody! (Hi Dr. Nick!)
First, Sometimes it will have decent low end power and will at least squeal the tires and chirp going into second, and sometimes it wont. Mostly it feels really lacking on the low end. The Traction control is on. It will almost feel like a turbo kicks in at a higher rpm. (Keep in mind I live at 6,000 ft above the ocean.) I was wondering if the "turbo lag" is normal, or if it's time for a tune up and TB cleaning.
:wavehi:

First of all your reference to The Simpsons didn't go unnoticed :bouncy:

My 2000 STS does this, too - never have gotten a good spin from it even though my tires are worn enough to do this. I've noticed that the vehicle will not start out in 1st unless you are near a dead stop (0 - 2 mph or so). Otherwise you're rolling in 2nd to begin with. If you really want to tear up the pavement you'll probably need to stick it.
 

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2001 SLS, 1997 STS, 71 Eldo
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76 Posts
MY 97 STS, with 200,000 miles would smoke the fronts and chirp second, this was after pulling the intake, and giving it a very good decarboning. Also swapping out the upper engine dog bone mounts with custom SOLID steel mounts


My 01 SLS with 80,000 shows no signs of carbon on the throttle bottle or the Injectors, but won't lay down any rubber, and I may chirp the belts on a hard 2nd shift but not the tires. The engine play sucks up all the torque transfer to get that chirp, I'll have to figure out something, haven't come across any rel promising ideas on here.
 

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99 Seville STS
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31 Posts
Discussion Starter #5
OH DRAT!
I was kinda hoping I could do a quick fix, somehow. Thanks for the info anyway.
 

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2001 SLS, 1997 STS, 71 Eldo
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76 Posts
I mean you can try Seafoaming the hell outta of it, but the best way is to pull the intake, and Saturate the intake , and I used a vacum, some degreaser/ Seafom, pulled the plugs, and worked on decarboing it for about two day of soaking the intake and the cylinder ports.

Also change the injector o-rings and intake gasket.

Its not a big deal to pull the intake, the longest process is just letting the chemicals do there work
 
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