Burning Rubber

iTrader: (1)

My 1996 lt1 is missing and popping under load and hesitates real bad. I have tried different sized injectors. this motor has just been rebuilt. i was thinking that maybe it is something to do with timing. If it is how would I adjust the timing?

Here is a mod list: CC306 cam, 30# injectors, long tube headers, Manual steering, ac delete, smog delete, the exhaust is open at the moment but the O2s are in, mail order tune, underdrive pullies.

Burning Rubber

iTrader: (1)

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Ironxcross

iTrader: (8)

If its tuned for the cam and other things, that should be fine. You say the exhaust is open, but where? After the headers?
Could be the opti - did you put a new one in when you did the cam?

I don't know much but I'm going with opti as the culprit.

My25thTransAm

Same crap with my 94 TA. Roller went south and rolled my cam dry. Had to upgrade

Burning Rubber

iTrader: (1)

I did not change the opti itself but i did put an msd cap and rotor and new plugs and wires. the exhaust consists of long tube headers and a piece of pipeabout 6 to 8 inches long with the o2s in it.

seawolf06

iTrader: (8)

I would recheck all your plugs and wires first. Then check the opti. I know it's obvious, but you did mark the rotor before you took it off so that it wasn't installed 180* backwards correct? Timing chain could also be off. My guess is crossed plug wires, though, as that's what happened to me.

Burning Rubber

iTrader: (1)

that could be a possibilty. but i was wondering if there is anyway to check the timing?? This is my first lt1. i will check the plugs and wires next time i mess with the car.

seawolf06

iTrader: (8)

It's very difficult to check the timing on the LT1.

Burning Rubber

iTrader: (1)

do you have to have a laptop?

seawolf06

iTrader: (8)

To check the computer timing, yes, but that only tells you what the pcm's ignition timing is. It doesn't tell you what timing the engine is actually seeing, for instance, if two plug wires are crossed or timing chain is off.

Burning Rubber

iTrader: (1)

right. i think tomorrow or friday i am going to hook a scanner to it and see what kinda codes it pulls.