Ford: '73 Ford 351c pings - Help Please

Randy opined in news:168.3.44:
 

 

Absent vacuum leaks -

Sounds to me like the Adjustments were made to this particular carburetor.

The mixture is controlled by the main metering jets, not screw adjustment.

Those you presently run may be too small.

Depends on Carb. Does yours have the "power valve"?

Was this originally a factory 4V or a 2V engine? What carb are you running?
What ignition and distributor? What is your initial advance and how is the
vacuum advance hooked up?

Randy wrote: 

--

Tom
TS3
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Look here, read between lines (not on main subject)...

http://www.chevyhiperformance.com/techarticles/74058/index.html

but on re-reading your post, you seem to say that it would ping on tip-in.
That means slight acceleration.. that true?

If so, that's your main jets... can you disable the secondary? When you do
does it still have the problem?

I LOVE EECIV

Hi Backyard Mechanic,

On Sep 07 2003, Backyard Mechanic wrote:
 

Good point, I hadn't thought of that, but I'm fairly sure that I didn't
missed any of the hoses when I was attaching them. It's possible that
there might I might have missed a small hole.

Hmm, I could go around the top of the Intake Manifold and spray
something and see if it gets sucked in and the engine speeds up. Would
Berryman B-12 be enough to do that? Or is there something better?
 

I'm not sure what those would be and I'm not sure if the carburetor is
stock to the vehicle. More below.
 

Ah, right. Sounds like a random process if this is the problem locating
the correct size jet.
 

Would that be because up in the higher altitude the less air mixes
better with the smaller amount of gas? In other words, at sea leave, I'm
not placing enough gas into the engine to match the greater amount of
air.

But I'm not sure how that would effect the mid-range, the 2-3000 feet
power drop. I suppose it is possible that it could be a coincidence and
there is something else the matter.
 

The carburetor has the tag from Motorcraft, it reads:

D6PE AFA

I've looked for what the numbers mean over at Motorcraft as well as
other places and the D6PE doesn't exist. The best guess is that this is
a carburetor from 1976 (D6), but the PE doesn't match.

As near as I can tell it is either the 4300 or the 4350 based on the
Idle Speed Adjustment (ISA) for these reasons:

1) The ISA is not just a screw (by itself) which when turned moves the
Throttle Lever.

2) The ISA is not a screw located at the end of the solenoid which would
extend the solenoid armature into the Throttle Lever.

3) The ISA is not adjusted by rotating the entire solenoid body into a
threaded bracket pushing it into the Throttle Lever.

Instead, the ISA works by a U shaped bracket mounted on the Intake
Manifold. The U shaped bracket has a long screw which is threaded from
one end to the other long-wise. Attached in the middle of the screw
threads is another U shaped bracket. This one is smaller, upside down
and has the solenoid mounted on it. When the screw at the end of the U
shaped bracket is turned, it positions the entire solenoid into and away
from the Throttle Lever. Like so:

Direction of Solenoid Movement -->

.------. ..
| |==== ||
Turn `-|--|-' ||
Here | | | | \\
`--> *+-----+--+----| \\
| | ||
`-------------' ()

I don't know how standard this setup was back then. The other thing the
carburetor has is a square hole on top.

--

Randy

Randy opined in news:168.3.44:
 

{slash}

1. You're beyond my level of expertise... and, quite frankly, interest. I
hated carbs in the 60's, I hate them now.

- I prolly shouldnt even have got into this

2. Read what WLTom wrote.. I blush to think that I forgot to tell you to make
sure you have close to spec timing setup.

3. What do your plugs say?



 

Hi Backyard Mechanic,

On Sep 07 2003, Backyard Mechanic wrote:
 

The description doesn't fit. For example:

"Your Holley-carbureted street car idles terribly"

Nope, smooth as silk.

"has taken to fouling spark plugs every week or so"

Nope, they're light-tan.

"the gas mileage absolutely sucks"

Its an old truck, it's suppose to suck. If I keep my foot off the
pelt, I can get about 16 on the freeway.

"there’s an ominous black cloud swirling from your exhaust"

Nope, white and watery.

"If any of these descriptions fit your Holley carb-equipped street or
race car, you probably have a blown power valve."

Thanks for the info, but it seems unlikely that this is the problem.
 

It pings during high acceleration or going up the local hills. Just not
at high altitude.

The high acceleration is usually getting on the freeway or making a left
turn across traffic without a light to assist.

One local street which goes straight up to the top of a hill is quite
steep and long. If I floor at the base I can maintain 3rd gear for about a
quarter of the distance then it pings, 2nd for about 1/2 the overall
distance then it pings, and near the top (last quarter and steepest) 1st
gear @ 3000 RRM (it has a factory tech in the dash) doing about 10-15 MPH.

When I mention a hill, I'm thinking of 1000 feet high or less.
 

I'm not sure.
 

Electronic Engine Control (Version IV)

The only thing electronic is the coil and points.

--

Randy

Hi Whole Lotta Tom,

On Sep 07 2003, Whole Lotta Tom wrote:
 

4 bbl.
 

It says D6PE ATA on the little metal tab.
 

Stock coil and points.
 

Not sure, I've been letting the tune-up shop do all the tune-ups. I
figure they are probably setting it to factory.
 

Hmm, good question. I believe it comes off the bottom of the carburetor
in the back.

--

Randy

Hi Backyard Mechanic,

On Sep 07 2003, Backyard Mechanic wrote:
 

Nope problem.
 

Then I wouldn't have drawn that neat little ASCII art picture of the
solenoid mount.
 

Bone stock coil and points.
 

I'd have to get back to you on that one. I'm not near the Ranchero at
the moment.

Thanks for your time.

--

Randy