happyhapka

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?

8Mike9

No, find out why she's running rich

camarofvr

Mine seems to like 10* with 72cc heads.

happyhapka

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

happyhapka

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

camarofvr

All gm's run rich at first startup.

happyhapka

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

camarofvr

No that's not normal. Check your plugs?

happyhapka

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.

camarofvr

I've never had good luck with accel.

happyhapka

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

8Mike9

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

camarofvr

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

happyhapka

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.

happyhapka

Or maybe my inj?

camarofvr

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.

happyhapka

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

happyhapka

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

camarofvr

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

happyhapka

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?

camarofvr

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