soo...
heres the deal:

Went and got the final changeover, my 3.4 is now running a complete 3400 topend (heads from a 2000 + Grand am with the 1.76" intake valve, d shaped exh ports, 3400 plenum and lower intake, 19# injectors) after trying to do a intake swap myself, and bending a valve.

Short Short Version:
i had someone do all the labor as i didnt have the time to track it down slowly myself. so i get it done, and i go to pick up the car, drive it around the block..im like..decent power... i step on the gas.. rpms climb about 100 and then car stalls like the gas cutout.. im like wtf..and i try to restart, wont, try again, wont, try again...BAM! - huge backfire.. so i coast over to the side of the road, and let it sit a minute, restart, take it back, talk with the guy -- he says, i dunno, leave it for a day. i do so. he says its ready the next day - i come and drive it around the block, same problem, he says he doesnt know so im like f*** this isht and just drove it home, dont want the idiot working on my car.

so as of today, car runs, but stumlbes, ive tried everything i can think of, everything seems to be working fine according to my auto x-ray, but i get misfires / detonation on acceleration and such. im wondering if my car is running too low an octane (i know you are gonna be like - on a 3.4?!?)

i only ask this cause the CC on the 3400 heads are 28cc and the ones on the iron heads are 53cc. even tho i used the grand am pistons to keep the CR down to 9.5:1 -> its still a huge jump in CC size. so i just wonder if now i have to run higher than 91 octane to get the car to idle properly / accelerate.

mind you the car has no problem with WOT at high rpm. only low / take off.

thanks for any info, if you have any q's ask ill try to be as descriptive as possible.

thx

-Russ

 

did the car start doing this after you got it back?

if so then give the guy shi*
and tell him to fix it

if he feels its in his best interest not to fix it then take the next step

nice exhaust btw

 

thanks for the compliment on the exhaust -- as for wether it started doin it after, yea it did..but. i cant directly attribute it to the guy. cause its a wierd *** problem, i took it to a second mechanic and the second mechanic couldnt figure it out either.

anyway -- i've been talking with a friend of mine that programs for the 3.4 DOHC and gave him an auto x-ray reading i did last nite, WOT Run - 99% throttle :

Right Block Learn: 137
Left Block Learn: 136
A/F: 12.6:1
Injector Pulsewidth: 21.7 mS

according to him im going past static on my injectors. they are supposedly 19#, but i dont know exactly how to check. im thinkin a AFPR / Fuel Pump / 24# or more FI is in the works.

 

Widen the injector pulse and tune the nos timer and youll run 9s

 

fast and the furious....lets not get ricey in here lol

 

dont hate just cause you dont know what im talkin about

 

I wasn't hating I was just joking around. geez lighten up people.