92 SSEi chugging under slow and even aceleration when warm - 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 07-05-2005, 02:54 AM   #11
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Do you know what the part number & ball park price is ?
I tried searching there site before but I couldn't find a vehicle specific Cat, only a universal.
Is using one of there cats going to screw up my stock muffler (before I get the dollars to replace it) or my back pressure (power of stock design) ?
I don't really want to upgrade to an aftermarket if it means power loss vs. the stock set up. Did you get a power increase when you went aftermarket ?

Thanks again,
Dutch
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Old 07-05-2005, 10:32 AM   #12
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Use the universal. It won't screw you up. You'll hear a slight change in exhaust note (for the better), and you'll feel a power increase assuming your cat is clogged or stock in good condition.

I did my cat 6 months before the rest of the exhaust. Use a universal with 2.5" inlet and outlet, no breather. The only way your muffler will get screwed up is if the old cat spewed cat guts into the muffler when it failed.
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Old 07-05-2005, 11:05 AM   #13
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Usually a cat won't spew it'* guts into the muffy, but if it did your muffy should smell like chicken.

My cat was rattling and seems good cold...it'* amazing how once they've let go they usually plug right up.

A stock replacement from Advance cost me $160 the Magna'* I think are around $60
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Old 07-06-2005, 10:01 PM   #14
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I am having a somewhat similar problem with my '93. Once the car is warmed up, it will chug and buck at anything over 3000 rpm. Under that, it drives like a champ. This may make it obvious, but I have noticed that the exhaust is louder ( like an exhaust leak) around where the cat is located. I haven't checked for an all out leak, but if this problem is related to the cat, that will give me a good reason to replace it.
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Old 07-07-2005, 04:11 AM   #15
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Ok after a few nights working on this beast, I finally got the tank droped....what a pain.
I went and picked up a new AC Delco fuel pump & strainer ($130) and new straps ($25 for the pair) to hold the tank as the old ones were badly rusted and had to cut one.

Still have to grab some more parts like the bolts that secure the straps ($7 each w / nut) and a new fuel sending unit ($100) & a Magna Flow universal cat ($80).
I might also grab a new tank cause it looks pretty rusty (can't really afford it though) this misson is probably gonna cost me around $500.

It'* gonna be interesting to see what condition the pump & strainer is in once I remove the assembly from the tank. Also to see what is causing this problem.

I will post back to let you know the outcome.

Thanks again for all the help & suggestions,
Dutch
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Old 07-08-2005, 02:22 AM   #16
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Default same thing here

Im having the same problem now but it happens to me even when its cold. my mecanic seems to think it'* a miss fire but we havent had time to check it out.and ofter when i hit the gas hard (about 1/2 way) i hear a knock or a something that sound to me like a valve poping open then it bogges to like 500 rpm or stalls all together.I may be misstaken about the valve poping sound as i am no mecaniac by any strech of the imagination.and i know that fuel pressure is good (40 psi)...so 'm thinking somthing to do with ignition.so if you can help me out here to I would greatly apprecheate it.
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Old 07-08-2005, 02:24 AM   #17
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Check the back of your harmonic balancer for cracking in the rubber.

And start with the basics. Plugs and wires. At least the plugs, and check the wires. Use the procedure in Techinfo for checking your coils.
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Old 07-14-2005, 09:56 PM   #18
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Well problem fixed after aprox. $500 (canadian).
I have wanted to change the strainer on the fuel pump since I found out about the TSB on the car which caused the car to stall on right hand turns.
More recently the problem with the car wanting to stall and chugging while moving in a straight line prompted me to do the following.
Replaced the Gas Tank (was pretty rusty)
Replaced the Fuel Sending Unit (badly rusted)
Replaced the Fuel Pump & Strainer (new design for the strainer, longer)
Replaced the Straps, Fold Nuts and Bolts that hold the Tank
Replaced the Fuel Filter
Undercoated the car with Rubberised Ashfault undercoating
Bought new MagnaFlow Cat but have not installed as of yet.

My advice after this misson.........anyone who has not replaced the factory strainer (about the size of a large Tea Bag) and is having problems with the way the car runs, Replace it, mine was Black. If you don't have a hoist available to you, plan to spend a lot of time doing this job as it is not easy with Ramps or Stands.

Problem fixed...........Thx for all advice,
Dutch
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