95_muscle

Hey guys my lt1 is shooting black smoke out of the exhaust and missing pretty bad at idle all the way through wot. I replaced plugs icm Opti coolant temp sens. Fuel press is about 45.. Any thoughts?

95_muscle

Bump...

SS RRR

iTrader: (2)

Any backfiring?

95_muscle

Ah a little if I was to say downshift and be revving like 3k

SS RRR

iTrader: (2)

Backfiring during acceleration or deceleration?

95_muscle

Sometimes at wot it will backfire and it won't hardly climb RPMs and a little during deceleration

SS RRR

iTrader: (2)

Check/double check/triple check your plug wire routing as well as any burnt/damaged wires.

95_muscle

Alright Def. a good idea. Any other suggestions? I was thinkin about getting new wires anyways... Btw any advantage of thicker wires like 10 mm or something?

SS RRR

iTrader: (2)

Not unless you go OTVC. Just not enough room to safely route wires that size in stock location. Backfiring during acceleration usually points to a timing issue and one of the most popular symptoms of this are crossed or damaged plug wires. Have you done anything with the valvetrain before this happened?

95_muscle

No not the valve train but I am camming it as soon as the parts get in (hopefully this weekend) so I will probably get over the valve covers. Any good brands? And could it be vacuum lines? We had the ones on the Opti backwards and when we swapped those back it helped some

toomany

Mine does this when going wot from a steady cruise if I don't downshift. I atribute it to not having the o2 sensors hooked up correctly. Both of the front ones had their wiring burnt from when the old owner insalled the headers. I sort of repaired the wiring, but think i have a bad connection. Sometimes it will run awesome...then you hit a big enough bump to rattle the wires and it runs like *** for a while.

SS RRR

iTrader: (2)

Speed_Dmn24 or whatever his screen name bought FireCore wires to clear a misfire he had and it worked. I don't think vacuum lines would cause what you're experiencing unless it was a pretty substantial leak.

95_muscle

Okay well I just bought otvc wires so maybe thatll help?

93M6Formula

All you can do is try, Looks like you replaced most of the ignition already so this might be the last bit to get you going again.

95_muscle

Yeah maybe is a injector dumping too much fuel a possibility? Cause new ones are going in w the cam