thats another good thought...

but the power surges, if the cat was clogged id think it would be a powerloss overall...

with this problem, youll be flooring it, the car would feel like 230 hp, then it just surges and its like its a 200 hp car, then a second later, boom, like a nos button.

 

yeah i called a gm shop and told em the code...
and i mentioned maybe a bad cat, and he told me no..i would get a different code...

if i had a vacuum leak my boost guage would flutter...or I would not be idling @ 20vac steady correct?

if i decide to get new plugs today what ones should i get? and what gap?

 

well... i wouldnt spend the extra 20 bucks on the ngk... jsut get the autolite (model 3923) and they are 7 bucks for ALL 4!...

I would get new plugs no matter what... even if that isnt the problem, they need to be changed.

im not sure on the gapping.... i just used what was outta box and no problems.

 

I know my car HATES NGK copper plugs, but LOVES the Iridiums... When I put the 1 step colder copper's in it it "surges" kinda like he is suggesting under WOT...

Def try some plugs first... NGK copper's are only about $10 and Iridiums are about $30, even at Advance Auto, who usually stocks them...

 

got rid of the p0171
It was the filter the previous owner had installed....scepter or whatever that the auto place carries...replaced with a aem dry flow I had and that fixed that problem...cleaned the tb and sensors and the other issues are still present..

 

clean TB. also cat is probably clogged again.

go your local area thread to see if a local css.net member has hp tuners to log and tune.

 

yeah i cleaned the tb, that sure didn't help anything lol
whats the best way to tell if the cat is clogged?
I wonder if it could be the down stream 02, because it wasn't listed that it was replaced when the cat was...and if they ran very long on a bad cat, it would make the rear 02 go bad, correct?

 

the rear o2 i dont think had anything to do with the performance of the car..

my rear o2 sensor is unplugged... and isnt tuned out with hptuners.

 

i havent changed my plugs yet, went somewhere the other day and they quoted me $111 to change em *rotflmao* i was like umm have a nice day!

 

whaaaaaat.. geeze... lol...


Its not hard to do yourself..

It costs 7 dollars for all 4 plugs at napa.

btw you really need to change your plugs. lol

 

lol I know I'm gonna do em myself...i just stopped off on my way home one day to see what they would charge for the wopping 25 min. of time...I was like $45 sure I will get it done in 30 and continue on my 2 and a half hour trip back to east texas...but for $111 I was just like stfu I will never have u all do anything to my car.

but I do still need to find out what the plug gap should be

 

Stock SS/SC gap is .040"

 

that will make your sensors go bad for sure. the best bet to see if the ca is broken is to go under the car when the car is cold. take a hammer and tap on the cat. if you hear something jumping around in there when you tap it, then its broken/clogged.

changing the spark plugs would be a good/cheap thing to do to cross that off the list. O2 sensors are expensive so i suggest checking the other stuff first.