i have a 95 camaro lt1 and it was completly stock and last week i put on trickflow heads nt sure which ones, edelbrock intake, loud mouth headers borla 3" exhaust magnaflow cat. bbk 58mm tb, 30lb injectors, comp cams roller rockers, bullet cam 288/281-12hr and a programed pcm. it runs but it backfires at idle and throughout the driving range and has no power at all. seems like a timing problem but theres no adjustment? vacumm problem? dist? im very unfamiler with lt1s. any ideas?

 

did you degree the came when you put it in? it is easy to be off a tooth and throw timing off... describe how it runs when you are driving it a little better, is it missing badly?

 

Did you check that you have the spark plugs wired in the correct positions on the Opti?

 

its possible for it to be off a tooth or have 2 wires crossed and still run? but yeah they r all right. ill check them again tho. it has trouble starting but when its running it will idle normal but will backfire pretty loud. and while driving its even worse. wants to stall when coming to a stop and backfires alot throughout the rpm range and has absolutly no power kinda stumbles when accelerating.

 

I assume you have, but recheck everything, vacuum, plugs/wires at both plug end and at opti. did you do anything with fuel pressure? are your injectors used and or seated properly? what heads did you use?

a backfire can be caused by a number of things. need some more info...

 

it is possible for it to run, but it wouldn't run smooth.

 

ill go though it again but i have several times injectors r new and r seated. i put a new adjustable regulator on. yeah it runs to smooth to be a tooth off, and im not sure what the heads r. i can find out tomorrow. this guy gave me a bunch of parts and his car and said put it together. im kinda thinkin its the opti.

 

read the sticky at the top of the forum about how to diagnose a dead opti if you haven't already.

 

yeah i read it. just wanna know what else could cause this problem. does it sound like it could be the opti?

 

Normally not a backfire, but more of a missing problem. Usually when an opti is dead, the car won't even run it misses so bad. I would venture to say that it isn't your problem unless it is installed off a tooth (which is possible but not probable. It takes force to do).

 

ok. ill go though some stuff tomorrow and keep u guys posted thanks for the help

 

What did you set the fuel pressure at? Is it holding that value? What brand is the AFPR?

 

idk because i dont have a pressure tester. it ran fine b4 so it cant be the pump. and i have no idea what brand it is, its anodized red with a little allen set screw and a 3/8 nut on it for the adjustment

 

If I understand you correctly, you put a new AFPR on, and did not check the fuel pressure. What if its set to 65psi and pushing 22% extra fuel through the injectors with every pulse? Red anodized.... could it be an Aeromotive?

http://www.jegs.com/images/photos/0/027/027-13106.jpg

Your whole combo is confusing... you put on Trick Flow heads, but you don't know which ones they are. Were they the 54cc combustion chambers or the 62cc's? If they were 62cc's were they cut down to reduce the cc's, and maintain the stock compression ratio? You picked the Edelbrock intake, which has an issue with plenum volume. You put on an AFPR, but you don't know what brand it is. Totally unclear what a "loud mouth headers borla 3" exhaust magnaflow cat" is (a couple commas might make it easier to understand)????

I checked the Bullet Camshafts websites, and couldn't find that cam listed - what are the specs?

Who tuned the PCM?

The comment (post #10) which apears to suggest that your Opti could be "off a tooth" isn't really applicable, since you have a 95 with the vented Opti, and it doesn't used the splined driveshaft. If the vented Opti is "off", its 120 cam degrees off, and isn't likely to run at all.

 

I guess my first question would be, is it backfiring through the exhaust or intake? Would really help in determining which direction to go. It could just be a poly-lock that backed off......