Eddie 1406 - Fun with adjustments

[Nalanthi]

I'm going to rip this bastard apart when I get home.
After the truck sat for a good ten weeks so I could give the GTO some road time before she gets garaged for the winter, I hauled 'er back out for an axle swap and some other adjustments in anticipation of the cold months ahead.

My tune was ALL out of whack...

After a bout of ****** econ (13mpg down to 6mpg), I slapped the vac gauge on it last night to see what the engine had to say, and proceeded to tweak the A/F mixture.
Funny - it was perfect when I parked her, but now my best vac readings are with the A/F screws all the way in. That's not right...
The truck otherwise runs fine.


possible junk stuck in carb?
What do the rest of you think?

 

[MadOgre]

The idle mixture screws only control at idle so any thing above like 8-900 rpm has nothing to do with those screws. Driving down the road is all about rods and jets.

I had to lean my primaries out 12% from the box set up and 8% on the secondaries

 

[rich weyand]

The idle mixture screws only control at idle so any thing above like 8-900 rpm has nothing to do with those screws. Driving down the road is all about rods and jets.

I had to lean my primaries out 12% from the box set up and 8% on the secondaries

Yeah, me, too. They come rich as hell stock from the box. My tune is all the way off the tuning chart, and dead on the numbers with the A/FR meter.

 

[MadOgre]

Yeah, me, too. They come rich as hell stock from the box. My tune is all the way off the tuning chart, and dead on the numbers with the A/FR meter.

Interesting Ive have been considering going leaner too.

I found the fast idle screw lol I was looking on the wrong side

 

[Nalanthi]

Likewise... I'm jetted 12% all around at 6500ft.
She seems to have run fine today, but the needle isn't the most accurate. The pump will tell me this weekend.
...still tripped out by the fact that i'm running best at idle with the screws all the way in.

I may still yank it this weekend if not for something to do.

 

[MadOgre]

Likewise... I'm jetted 12% all around at 6500ft.
She seems to have run fine today, but the needle isn't the most accurate. The pump will tell me this weekend.
...still tripped out by the fact that i'm running best at idle with the screws all the way in.

I may still yank it this weekend if not for something to do.

Ya that cant be right lol. I wonder if the idle screw is adjusted in enough that its taking it just off the idle and in to the part throttle stage ?

 

[scottybaccus]

I tune a lot of these, and have learned to make them dance, but two things are certain.

1. none of the settings are correct out of the box. I think shipping bangs them around too much. Go through the whole thing like you're installing a refresh kit, even if it has never been installed.

2. the Edelbrock calibration kit, with all the jets, springs and needles, is essential to getting it dialed in to your application. I have never found that mystery engine combo that they designed it for!

 

[MadOgre]

It is so they can sell you the calibration kit for another $75.