MAJOR Performance Problem SSEi Did a Ton of Testing No luck - 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 05-02-2006, 08:36 PM   #1
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Default MAJOR Performance Problem SSEi Did a Ton of Testing No luck

Hi, I'm having some major performance issues with my 1992 SSEi. The mods that I've done are in the signature.

The main problem with the car is that it is SLOW. This car is about as fast as an old carborated civic. I'm not exaggerating. I have a scan tool, I know how to read it, and I have never been stumped like this before. If anyone has any insight on what could be wrong please let me know your ideas.

I ran the car on a G-tech tonight to confirm the slowness of it. The first run was a 16.0 at 85mph. The 2nd, 16.8 @ 81mph, and the 3rd, 17.0 @ 80mph. The horsepower test showed a peak of 120hp LOL!

Here'* what I've checked/replaced

-Ran a compression test - all 6 cylinders made from 160-165psi of compression

-Did a fuel pressure test- fuel pressure was within normal range with no drop-off at WOT

-The scan tool shows 0KR at WOT, even with the 2.2" pulley, the highest value of KR I've observed was 3*, but this was just once, so I know my timing isn't being pulled like crazy or anything.

-The scan tool shows that my car is running RICH at WOT. The 02 voltage is usually around .96, which is on the high side, I'd like to see it around .9v

-Everything checks out good on the scan tool, nothing out of the ordinary, no codes, etc.

-The car makes 10-11psi of boost at WOT. The boost comes on VERY quickly and is genearlly steady.

-I AM getting belt slip on the */C belt. I'm running a gatorback with a 3.5" tensioner and the top of the belt is glazed. The slip is minor, but evident on the gauge (the boost hits about 9.5psi right away and then within a 1/2 second or so reaches its peak)

-The car has the following new parts on it: Lower intake gasket, supercharger outlet gasket, valve cover gaskets, new vacuum hoses, new throttle body gasket, new plugs gapped at .050", new wires, good oil, new pcv, and there'* probably some other stuff I'm forgetting.

-I tested the coils, the secondaries' resistances all checked out. I didn't test the primaries of the coils.

-I checked the rocker arms for proper torque, they all checked out. There are no cracked springs or signs of anything out of place.

-I checked the brakes to make sure that none were grabbing, they weren't.

-The transmission shifts what seems like perfect. The shifts are positive and without any hesitation, and the transmission hasn't slipped yet. I thought that the car might be starting in 2nd gear, but I felt the shifts, and verified it with the scantool, and it appears to be starting in first.

So basically to sum it up: I have a engine with great compression, new iginition components (minus the coils), proper fuel pressure and no signs AT ALL of leaning out, and I'm getting the boost that I should be getting with a brand new air filter and a nice CAI.

So wtf is wrong with this car?
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Old 05-02-2006, 09:01 PM   #2
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This is a mechanical problem, so I'm moving it to 92-99.

I'd like to see your IAT readings. What kind of plugs do you have? Can you do an exhaust backpressure test? What is your intake made out of?
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Old 05-02-2006, 09:09 PM   #3
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Quote:
Originally Posted by J Wikoff
This is a mechanical problem, so I'm moving it to 92-99.

I'd like to see your IAT readings. What kind of plugs do you have? Can you do an exhaust backpressure test? What is your intake made out of?
The IATs are usually around 90-100deg. when the car is warmed up. The sensor is in the pipe, not just hanging there. I doubt that'* the problem though because I'm not getting any KR. The intake is made out of stainless steel. I don't have the tools to do an exhaust backpressure test, but I don't have a cat, so the only restriction could be in the muffler, but I also have a cut-out before the muffler, and it doesn't make a difference in power if I open it or not.
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Old 05-02-2006, 09:15 PM   #4
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What brand was that filter I saw in your sig? Try running some seafoam lately? And what are your plugs?
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Old 05-02-2006, 09:20 PM   #5
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Quote:
Originally Posted by J Wikoff
What brand was that filter I saw in your sig? Try running some seafoam lately? And what are your plugs?
It'* a cheap one I got off of ebay. The car runs the same with no filter at all. The plugs are Autolite 104s. I'm not big on seafoam. When I pulled the supercharger and LIM, I cleaned everything. I could run it through my fuel system, but I personally don't think that seafoam is a miracle cure. The car is seriously down on power. I doub't that it'* something that could be fixed by cleaning a little crap out of my intake tract.
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Old 05-02-2006, 09:43 PM   #6
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Just trying to get ideas. Have you checked for vacuum leaks? Cleaned the MAF with rubbing alcohol and a q-tip?
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Old 05-02-2006, 10:05 PM   #7
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Quote:
Originally Posted by J Wikoff
Just trying to get ideas. Have you checked for vacuum leaks? Cleaned the MAF with rubbing alcohol and a q-tip?
I checked for vacuum leaks, I have not cleaned the maf yet however.
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Old 05-02-2006, 10:06 PM   #8
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Pull the MAF, if the wires look dark, clean them gently. If they look clean, it'* probably fine to put it right back in.
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Old 05-03-2006, 12:27 AM   #9
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Quote:
Originally Posted by J Wikoff
Pull the MAF, if the wires look dark, clean them gently. If they look clean, it'* probably fine to put it right back in.
This is much more major than a MAF problem I believe. The car won't even spin the tires when the torque converter is fully loaded from a stop (pedal to the floor and making boost). I'll still clean it though.

Honestly, I'm thinking that the problem has to be ignition or valvetrain-related. I could have a leaking injector, but I don't have any problems with starting, and the oil isn't loaded with fuel. The motor seems very solid, it'* just that something isn't right. If there was something wrong internally, It would show up in the compression test or as a knock or the like.

My last car was a LT1 Firebird. It made near 400rwhp with the stock bottom end and without any power adders. I've been working on cars for quite a while and I've never seen anything quite like this.
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Old 05-03-2006, 12:42 AM   #10
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Where are you located?
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