i have a 2000 trans am. mods are as follows:
volant cold air intake
ported tb with 100% blade mod
ported descreened maf
a/c delete
rear o2 delete
stock manifold and y pipe, gutted cats, into lm1
cam: .580/.590
288/294
236/242 @ 050
114 lsa


springs: 1.290"/.885" OD
1.055/.650" ID
130 lbs @ 1.800" -valve closed, spring instralled height
320 lbs @ .600" lift (1.200")
345 @ .640" lift (1.160")
max lift- .640"
rate- 313 lbs
average coil bind @ 1.090"


car was mail order tuned by pcmforless.com


now heres my issue. the car appears to jump from really rich to really lean constantly. itll startup and usually idle. sometimes its hard to even keep it running. the car has 0 power. just barely enough to move it, and it backfires bad while its going through the powerband. It will barely make it to 5000 rpm. I was throwing codes for my front o2 sensors and my maf sensor. high voltage and low voltage and circuit terminal L. My maf sensor and my front o2's are brand new. for a couple days i could unplug my maf sensor and it wouldnt affect how it runs at all. my engine sensor fuse was blown so i started rooting through the wiring looking for a wire grounding itself out somewhere because i put another fuse in and it hasnt blown yet. i havent found anything. i did however find a vaccum leak on one of the line coming off of the intake manifold. if i cover it up, the car tries to die then revs back to life and idles a little better but the car still has no power and sounds like ****. I need any suggestions or ideas i can get guys so please help me out.


If theres anyone in the pittsburgh area that think they can help me out PLEASE pm me. I need to get this figured out and any help would be greatly appreciated.

 

not trying to start anything but has the tune been checked? might ask pcmforless, or try a mail order from frost but after a cam install you need to hit up a dyno asap.

 

no it hasnt been checked.. but this just doesnt seem like its just the tune to me.. i could very easily be wrong but i dont know. again, if theres anybody in the area that can help me out, whether it be data logging or just brainstorming, anything helps at this point.

 

A buddy of mine had this problem after a head and cam swap. You have a terrible tune. You will prolly have to reset the factory tune and take ther car to a tune shop. I would say that sending the computer in by itself can't be as good without the car there. There is a place in Raleigh nc if you feel up for the drive they are well known and trusted however that is where aforementioned friend got his car tuned.

Tune

 

is there any possibility im having clearance issues? because the motor kinda sounds like its beating itself to death past 3800 rpm...

 

You have a cammed car trying to run on a mail order tune!!! Go get a dyno, Geezzz

 

This is your problem, IMO. Try to get a dyno tune and I bet you will see the results you were after. Mail order tunes are too "generic" and every car is different. Good luck!

 

I agree w/ getting a dyno tune for sure,thats alot of duration... however, i had to edit, it seems u have access to a scanner, whats it showing for ur IAC? it might b crapping out as well..My .02..

 

hopefully tomorrow ill be able to throw a scanner on it. I'll post the codes and ill datastream it and give you guys as much info as possible

 

Can you verify that the cam was installed correctly? Dot to dot? Degreed? The statement made about no power and backfiring sounds like the cam maybe off a tooth.

 

they were dot to dot when i got it back together. and the car did run fine for about 2 weeks and that was completely untuned

 

TTT

 

Should be a sign... That tune is garbage....

 

i'm with this guy

 

And at what point did it start running badly? Was it when you installed the mail order tune?

 

You really can't expect a car with that cam and other mods to run right on a mail order tune. Put your stock tune back in, adjust your throttle blade using the adjustment screw so your car won't die and take it to a tuner and get it dyno tuned.

 

it started running like this before i got the mail order tune.

 

fml

 

So you had all these mods already and it ran ****?

It ran ****, then you modded?

You didn't bother to even tune after mods, then it ran **** so you did a mail order tune and it didn't fix the problem.

Sorry man, as before, get the god damn thing Dyno tuned.

A Dyno will pick up what the hell is wrong,

 

UPDATE:
started tearing down the motor and i think i found my problem. One of my pushrods Is broken in half. Got the top half out, but it looks like the bottom half is gonna take a bit of work to get out... And it chewed its pathway in the head up pretty good too. Is it possible that this is the cause of ALL my problems?