acceleration problem

[grandpaslincoln]

Now that I have the HO headers on, GL is starting to act up. Whenever I am driving around 20 MPH, and I floor it, the engine sounds like it stalls. Then suddenly, it makes a few chugging noises, then the engine comes to life, and I got all teh acceleration I could want. It did this once before, and I solved it by adjusting the accel. pump to deliver more fuel. Why is it doing it now? Too much fuel? Still not enough???

[Lincolnmania]

sounds like you need to fatten up the mix a little to accomodate the headers via the two mix screws at the base of the carb back each put an eighth turn abd try it

[Grand Marquis GT]

Welcome to my world, jon...

[grandpaslincoln]

Thanks Scott, I will do that after work tomorrow.

Yeah Tom, that's what we get when we fuck with dem stock engines mang lol.

On a side note, my new (correct) oil pressure sender came, stuck it in, and the gauge works!!!! It is showing 40 PSI, I can't remember if that is a good number or not lol.

[gadget73]

40 psi when? hot/cold/idle/at speed? I think the spec in the book says if you have more than like 5 psi at hot idle its ok. General rule is 1 psi per 100 rpm. I get 50 psi on startup, about 60 cruising, and around 35 hot idle, but thats an engine with 2500 miles on it.

[Blaze86Vic]

I get
Cold Idle------Warm Idle
32psi-----------8psi

Cold 2500rpm-----Warm 2500rpm
58psi---------------49psi

[grandpaslincoln]

Well, if this thing is working right, I am running

40 PSI cold

38 Hot

Stays about the same at all engine RPM's

Now the car runs fine, I didn't adjust anything either. Might have something to do with it being cold and wet yesterday. GL acts up when the weather is shitty.

[Blaze86Vic]

Well for pretty much all rpms it should be about the same, however it should drop a lot at idle. If not there might be an issue. Though too much oil pressure is not terribly bad thing, it could be a sign of something bad.

[Southern_Pride]

Mine drops at idle. But i have the idle set to like 150 rpms. That may have something to do with it. Yes bad weather messes with our carbs

[Blaze86Vic]

I think it's something like 800 rpm and less where it should be less than 10psi. My idle is about 645rpm, and as I said that gets me 8psi warm. My engines only got about 75,000 miles on it.

[gadget73]

Not dropping off a lot at idle usually just means the bottom end isn't worn out. Just so long as it doesn't crank right off the scale at any point you're fine.

Holley carbs and weather do not mix well, which is a big part of why I don't like them. Another thought tho, how old / what kind of shape are your plug wires in? Old ones tend to act up in damp weather. They make a really pretty light show on a nice foggy night tho.

[grandpaslincoln]

GL has over 200,000 miles on him, but the engine was rebuilt/replaced at one point, but I have no idea when.

[Pablito]

Whenever I am driving around 20 MPH, and I floor it, the engine sounds like it stalls. Then suddenly, it makes a few chugging noises, then the engine comes to life, and I got all teh acceleration I could want.

That sounds like a lean bog off idle. If you can't straighten it out with the accelerator pump cam try stepping up the size of the shooters.

Holley carbs and weather do not mix well, which is a big part of why I don't like them.

Ummm.... huh?
Holleys are great when you know how to tune them properly. In fact I'd even say that they're far better than anything that now says Edelbrock (rebadged Carter AFB's). Holleys are infinately adjustable, and are extremely reliable when set up properly.

All carbs should be adjusted in some way to compensate for the change of seasons. If you look at any carb you'll see that most (if not all) carbs have a few holes on the accelerator pump lever for this very purpose.

On a side note..... Back in the day Edelbrock recommended that Holley carbs should be used on their manifolds to achieve best results. It was actually printed in their documentation that came with them.

Look at all of Vic Edelbrock's (and his daughter's) race cars... They all have Holleys.

IMHO The best carb I've ever used on a mildly built SBF (289/302) is the venerable Autolite 4100. At 470 (1.08 venturi) or 480 CFM (1.12 venturi) it's the perfect size for awesome throttle response, and great economy.

Just my .02

-Paul

[Grand Marquis GT]

Im not a fan of edelcrock carbs either :yuck:

[Blaze86Vic]

If I were getting a carb, it'd be Holley all the way!