95batmobile

iTrader: (2)

sounds like a cat.. had it happen to my jeep and my car. it would hit a certan rpm and would just get stuck.. got worse as the days went by.. first day i could go like 70 then by the 3rd day i was stuck at 50..

Gojira94

iTrader: (4)

True- my 94 A4 stock tune was set for a commanded idle of 550. Thought it was wrong until I did some checking.

stuart4185

Grazi, where do you live?

grazi

im in new jersey

stuart4185

damn, i messed up thinking you had an OBD2 car, whats the cost to get a reflash from PCMforless or similar? just take it back to stock, or slightly better optimization

grazi

So I think my first route is Im going to cut out my cat and install a high flow cat...I was thinking about doing a test pipe but I dont want to get too much smell and if I keep the car til next inspection, I dont want to deal with the hassle.....What do you guys reccomend for a good high flow cat. Seen a couple on ebay for like 40 bucks...Stupid question. Is the stock Y pipe going to be 2.5" for the LT-1?

cookietime

Before you cut the cat off, un hook the flange behind the cat, 4 bolts, and check if any exhaust is coming out. that should help determine if the cats clogged or not. If it is clogged you can hollow out the cat for now, until inspection time.To save a few bucks.
I needed a new 1 and opted for the magnaflow one, and passed nj sniffer testing.
http://www.ebay.com/itm/MagnaFlow-Di...c10f81&vxp=mtr

BTC

You might also have some metallic flakes coming out the rear of your exhaust if your cat has collapsed, or is clogged. This happened to me a few times, but my car was pretty much undriveable in each instance.

4K+Converter

I've been fighting a similar problem with my mother's 95 Mark VIII, except with a random miss everywhere. First I suspected bad gasoline and I've worked my way down to some sort of sensor problem.

I yanked a few fuses to deal with anything PCM related and the car came back to life temporarily. The miss was gone, and the car even had more "vacuum." I say this because on cold start when the idle rpm is high, it really starts moving when my foot comes off the brake. Additionally the brakes are way more touchy now, there is a small threshold where the brakes are off, then on. This is the way it was before the problem. But a few days later it started hardcore studdering again, but was fixed with yanking the fuses again. Next time I'm going to yank one fuse at a time to see which system the miss is involved with.

My advice is to pull the PCM fuse and let it forget all its temporary data. I think 15 minutes is all you need, although I haven't dealt with an LT1 car in a long while. Although I don't know what sort of involvement the PCM has to do with your problem. The good news is that testing it is free and if it resolves your problem temporarily, it'll give you another clue to whats going on.

93v8clone

how old are o2 sensors ????? mine did same a so/p and i hanged em and ran great after

Mississippi

Mine just did this a few months ago. Its the cat. Gut the cat and then go have fun. If you live in a state that requires emissions bs then replace that ******. It definitely sounds like a cat for sure. Don't do like I did and change an optispark when you don't need to.

Coyotesa

iTrader: (1)

Any updates?

quik95lt1

iTrader: (7)

happened in my gto i blew the cat out of its housing and it got lodged in my x pipe........car didn't misfire but felt like it was down about 200 hp lol figured it out immediatly when i saw the little pieces of tin foil shooting out the back of the car lol

grazi

I actually havent had the time to get under there and do it yet. With the babies I have about 1 hour per month of free time. Im excited to see if its the cat though. thx

ZGOBYBY

iTrader: (14)

Good luck man, you are in good hands around here.