LB9 1986 trans am...its really almost stock except ignition CAI,airfoil,no muffler(it fell off lol) 3" exhaust.. 160* thermostat. K&N filter...


But since the muffler fell off she runs a bit more richer... Should I start at 8-9* adv?

 

No, find out why she's running rich

 

Mine seems to like 10* with 72cc heads.

 

I think it has to do something with the muffler falling off.

 

She's just rich at first until it warms up than is good

 

All gm's run rich at first startup.

 

Yes but she runs rough not like normal and I can smell she runs really rich but its weird.... She smells rich but my AFR short band says its right in stoich just way leaner until she warms up than its in normal range

 

No that's not normal. Check your plugs?

 

I have not yet..it started doing it about a week ago just haven't had time to take her out to my shop.... I was thinking plugs or O2 sensor... It has accel 8mm wires and cap and rotor... It came with the car when I naught her... I'm a msd guy so eventually that will be changed and wanted to change the plugs to Bosch+4 plugs for it.

 

I've never had good luck with accel.

 

Lol it is why I'm a msd guy....

 

Rich, but way leaner...stoich...but not......think about things in a logical manner,,,smells rich, then yes it is...regardless of what your gauge says -note to self, may need ne gauge?

"all GM's run rich at start up"

How can I say this so as not to hurt any feelings...

BullShite

 

Yeah there's no such thing as "cold engine enrichment". Guess I should have said "some".

 

You don't think that when the muffler fell off that would cause it to run rich.. I say rich because it smells rich.. The guage is brand new auto meter... It just reads leaner at start and runs rough for a couple min. Than smooths out to normal and drives perfect.

 

Or maybe my inj?

 

No that won't affect how it burns fuel. Whenever I've had that kind of problem it was usually the plugs fouling until they were warmed up.

 

That would make sense... Thanks everyone.... I'll keep you all posted

 

What are some real ally good spark plugs these cars like? I usually is Bosch +4.

 

About the only kind I'll use are Bosch platinums but I was in a pinch one night and had to buy some autolight double platinums because I needed a shorter one to clear my headers and they work well. I've had good luck with both seems they don't foul as easy

 

Just found out that MSD makes spark plugs so I'm going to give them a try... What is the best gap for these engines?

 

I'd just leave them stock at.035 unless otherwise noticed.