Sgt. Spuds

iTrader: (1)

Alright the specs are in my sig. First time the car started with the new motor and tune, it ran pretty good, see sig for idle/rev clip. It's got a pcm for less tune on it that I think is the problem, but now what it does is load up and foul the plugs out, I have to take all 8 out, clean em, re install, and the car will start right up, but sooner or later, the same thing happens, runs rich and dies... Car is still open headers, but everything else is finished on the car, just want to drive it. I noticed that the air filter on my CAI was pretty dirty, but I haven't had the chance to clean the plugs again and try it without that filter..

And for what its worth, the car went through a foot puddle in July with the stock motor, but this is the same maf and filter that got soaked, car hydro locked and snapped a stock rod..

street demon2k3

iTrader: (3)

How long has this been going on, or did you just get the car working?

Sgt. Spuds

iTrader: (1)

just got the car running

96redcamaro

iTrader: (1)

when I had my headers put on the O2's got burnt.

do you think your O2's are good?

1994Z28Lt1

iTrader: (1)

i think possibly having open headers could be a part of the problem, since the oxygen sensors are close to the end of the collectors oxygen could make its way back there on deceleration and the pcm will think its running lean and it will dump the fuel in a foul the plugs

its really no different than having leaking collectors and having it affect the oxygen sensors

i would try and get some exhaust on there, reset the pcm and see where that takes you, not only that but definitely cleaning that filter and the maf couldn't hurt either

do the easy things first

9formula4

iTrader: (5)

yeah spuds get an exhaust on that thing and change the O2s. You'll be fine after that

Sgt. Spuds

iTrader: (1)

The headers were used when I got them, so there wasn't any residual coating on them, o2's are brand new as well. Thanks for the advice though, I'm not trying to be a smart *** and put down all your suggestions lol. So how do open header car's run then? I've seen a few, this thing wont even make it down the street and back without fouling out.. Could I disconnect the o2's and see if it will run like that? I know it won't go into closed loop but would it atleast run, to where i could drive it to an exhaust shop? If you watch the video in my sig, when I rev it up a bit its been running for probably 3-4 mins, and its shooting 6 inch flames out of the headers lol..

Tudds

iTrader: (4)

I ran open headers for a week and my car was fine, it was an ls1 though
Swap the maf with someone you know

1994Z28Lt1

iTrader: (1)

how old are the oxygen sensors and what brand are they?

keep in mind that if its running rich enough to foul plug it really doesn't take long to mess up some good oxygen sensors they dont like being covered in soot

Sgt. Spuds

iTrader: (1)

Bosch :'( lol they might have ~500 miles on them before the car went down, last july

1994Z28Lt1

iTrader: (1)

well we'll probably get some Bosch fanboys in here after i tell you this but oh well

when i had Bosch sensors in my car, (LT's stock cam) i was having the same problem with running rich and fouling out plugs, i changed plugs, wires, coil (opti was new) trying to chase that problem and never did fix it until i finally manned up and got some AcDelco sensors in there it has run perfect ever since

Sgt. Spuds

iTrader: (1)

So I shouldn't get the new 02's until I get the exhaust figured out right? I know bosch o2's aren't very good, but its all I could find last year..

csjta2

iTrader: (43)

1)Check fuel pressure, make sure it's within specs

2)Try another PCM, got any friends with LT1 cars? Even if it's a factory tune it will tell you if the tune is wrong that you have now.

hth

Sgt. Spuds

iTrader: (1)

The car will not start on a factory tune, cam's a bit too big lol, I tried before I sent my pcm off to Brain at PCM's for less.

1994Z28Lt1

iTrader: (1)

if you want to run open headers i would atleast get and extension and run a turndown or something, anything to lengthen the distance from the exhaust outlet and the oxygen sensors and then get some new oxygen sensors and see where you sit

97badass

iTrader: (8)

sounds totally wicked! but im guessing with everyone else about the O2 sensors...and will that cam work with stock heads? i see you have yours ported...

Sgt. Spuds

iTrader: (1)

Mine are very slightly touched up, nothing major, I assume stock heads would work fine. thanks

Sgt. Spuds

iTrader: (1)

No one answered if my car would run in open loop fine if I disconnected my o2's

EDIT

I just went to autozone and found some 3 inch id to 3 inch od 12 inch pipes, 7.99 each, would these fit and seal around my slip on collectors and be able to be sealed by a clamp? The end of my headers in kind of tapered and these are more boxy where they change from 3 inch id to od

Smokinlt1

How well does it run before she stalls out? If your O2s are fairly new and the car ran good before, I would get a scanner and see if the Coolant Temp Sensor is reading correctly. If it reads a minus anything, it dumps fuel and can cause plugs to foul very quickly. The computer thinks the motor needs the extra gas to start and run if the reading is a minus. It's the sensor that screws into the waterpump, the one on the side of the head is for your gauge.

You might already know all that but I figured I'd throw out a different opinion. I had a PCMfor less tune when I had the Hotcam kit and it was very rich. Pulled the plugs to verify it was rich.

street demon2k3

iTrader: (3)

I used the same Autozone extentions and some turndowns meanwhile I got the car running. If you disconnect the O2's the car will stay in open loop, that might help you figure the problem(maybe the O2's).