So would anyone who what the hell is going on with my POS

[nmskull66]

Ok so not sure if anyone has ever heard of doing this before or if im the first person to actually do this..? I have a 2001 Firebird with a 3800 all last year i sprayed the car with a dual stage nitrous kit (200hp estimated) never tuned it just ran 110 and it help up until the very last track event of the year. It backfired and I bent a valve so i finally got around to fixing the head (9 months later) so this is what i did and where my problem comes into play.


I used to have a built GTP that constantly broke so i have all these performance parts for a 3800 laying around so I dropped the motor in the firebird, and instead of putting a set of stock N/A heads on the car I put my Built Ported GTP heads on with 1.9 rockers, headers, ported my lower intake very minimal just to remove the roughness, added a direct port nitrous kit where the injectors would have went in the intake, moved the injectors to the heads, head studded it, double roller, etc.

Finished the car started it, it was fine went to drive it and if driving normally the car runs fine. When WOT the car wont shift, Lacks power, misfires. I had my buddy with HP tuners look at it and the minute the car is floored spark knock maxes out.... We added 20% more fuel and removed 8 degrees of timing and it barely made a dent in the problem. Only lower the spark knock to about 10 degrees instead of 15+


Does anyone have any idea on what could possibly be going on?

Any help is greatly appreciated. Not looking for peoples sarcasm or bullshit I just want help, Thanks

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[Mike K]

It sounds like false knock. Those sensors are just frequency based.

 

[PANDA]

Have you changed the plugs?

I know I asked you that at the track when you were spraying and you said NO.

 

[nmskull66]

yeah brand new 103's but i didnt gap them could that be an issue? also could the style of 103 cause a problem as well? and i dont understand how if the sensors were working fine before i dropped the motor why all of a sudden they wouldnt work?

 

[1quick]

I think 103's are gapped around 40-45 out of the box so they should be ok

 

[02BlueGT]

What are your fuel trims when your getting the KR?

Did you ground out/ pinch any of the KR sensor wires? They are easy to fuckup .


Sounds like you used my idea of direct port nitrous from your other thread, ill send you a bill.

 

[camarokidz28]

How many miles did you put on it? I had 9 degrees after 30 miles. took about 100 miles and mine was down to 3ish on its own. put in 104s and i'm at 2-2.5 now

 

[nmskull66]

I wasn't looking at the fuel trims my buddy was on his laptop so that I don't know but I have like 400 miles on the car

 

[Flyn]

Some people get their cars tuned after making extensive modifications.

 

[nmskull66]

Some people get their cars tuned after making extensive modifications.

um.... no shit thats why i posted this

 

[Turbocharged400sbc]

you cleaned off al the carbon while the heads were off right?

you know the inj spray pattern and volume are good? same inj as before?

make sure fuel isnt leaking past the fuel solenoid.

na motors have a higher kr sensor tq for more sensitivity

what wot commanded timing at that 10-15* of kr?

 

[Burtonrider10022]

who, what, when, where, and why.

 

[nmskull66]

James I sent you a PM about this

 

[Turbocharged400sbc]

103's or ngk equiv gapped at .040 and read/change em often.

its sounding like a coil got cracked or something for that misfire.

if the dbl roller was installed straight up and the cam and crank sensor are good then valve timing probably isnt it.

doing a case learn and watching the misfire counts might help you narrow down the problem cylinders.

 

[nmskull66]

103's or ngk equiv gapped at .040 and read/change em often.

its sounding like a coil got cracked or something for that misfire.

if the dbl roller was installed straight up and the cam and crank sensor are good then valve timing probably isnt it.

doing a case learn and watching the misfire counts might help you narrow down the problem cylinders.

Its not missing, it feels like it is because its spark knock is so high. driving normal its perfect. Would deleting the EGR have something to do with this? Also what if i switched to a stock AC Delco plug for the car or would the 103's be best?

 

[1quick]

Deleting the egr will have no affect other than the check engine light and very slightly worse gas mileage, if your going to spray the world at it I'd stick with the 103's

 

[1quick]

Have you scanned it and verified all the sensors are reading correct? Sounds like maybe a tps sensor

 

[Mike@Devo2ning]

You have a wideband in the car?

 

[nmskull66]

Just ordered a wide band, and there is no tps because it's electronic throttle body.

 

[1quick]

There is a tps its just built into the throttle body, make sure it's reading, I have a few spair dbw throttle body's if you need one

 

[Mike@Devo2ning]

Just ordered a wide band, and there is no tps because it's electronic throttle body.

Get that installed, that will definitely help in the diagnosis. Let us know what the AFR is when this stuff is happening. You could video it with the gauges.

 

[billzrx7]

Ground the block. Ive had a similar issue in the past to this where normal driving it has zero problems, WOT and it falls flat.

 

[Turbocharged400sbc]

There is a tps its just built into the throttle body, make sure it's reading, I have a few spair dbw throttle body's if you need one

i believe those use a unique tb vs the l26/32

i think you can swap the TAC module but the sensor traces will remain with the TB

what you have is sounding like a misfire and/or the trans on its way out (not to mention no shift adaptive learned yet)

intermittent hickups/glitches are becoming more common as the connector terminals get loose after repeated service. double check things
if your so sure the coils ignition system arent the problem

you probably shoulda installed the chain 2* retarded like the oem l36/26 or hell even 4* if ya check valve clearance.

monitor misfires and see which cylinder/s get the highest average counts

id still say try swapping out parts and doing testdrives

which sucks cause those things are annoying unless you leave the cowl off

 

[nmskull66]

i believe those use a unique tb vs the l26/32

i think you can swap the TAC module but the sensor traces will remain with the TB

what you have is sounding like a misfire and/or the trans on its way out (not to mention no shift adaptive learned yet)

intermittent hickups/glitches are becoming more common as the connector terminals get loose after repeated service. double check things
if your so sure the coils ignition system arent the problem

you probably shoulda installed the chain 2* retarded like the oem l36/26 or hell even 4* if ya check valve clearance.

monitor misfires and see which cylinder/s get the highest average counts

id still say try swapping out parts and doing testdrives

which sucks cause those things are annoying unless you leave the cowl off

I cut the cowl apart with a sawzall. Makes working on a motor half covered alot easier

 

[Turbocharged400sbc]

sawzall mod