Steer me to plain tuneup direction

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f100owner
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Steer me to plain tuneup direction

Post #1 by f100owner » Mon Apr 02, 2018 9:07 pm

I have been searching and have ran across this info for newer trucks, but can someone point me to step by step instructions for timing my 1971 f100 with 240 six, auto choke, auto trans with Carter yf carb? Also, is there any differences between the Carter D1TF- ya/xa/za/aaa carbs. I am planning to replace my carb. Well buy one and keep my original as a platform to learn how to rebuild.
The truck does have a pertronix electronic ignition module. The engine was rebuilt about two years ago, but between battling a manual to auto trans upgrade and other challenges, the engine hasn't ran much. The occasional start to hear it run and watch it smoke and sputter.
Texas;
1971 F100 - 240CID
2016 Ford Expedition
2015 Ford Fusion
2016 Harley - Ultra Limited.

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bubba22349
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Re: Steer me to plain tuneup direction

Post #2 by bubba22349 » Sun May 20, 2018 11:51 pm

[quote="f100owner"]I have been searching and have ran across this info for newer trucks, but can someone point me to step by step instructions for timing my 1971 f100 with 240 six, auto choke, auto trans with Carter yf carb? Also, is there any differences between the Carter D1TF- ya/xa/za/aaa carbs. I am planning to replace my carb. Well buy one and keep my original as a platform to learn how to rebuild.
The truck does have a pertronix electronic ignition module. The engine was rebuilt about two years ago, but between battling a manual to auto trans upgrade and other challenges, the engine hasn't ran much. The occasional start to hear it run and watch it smoke and sputter.[/

Stock tuneup specs for a 1971 240 six
1. Spark Plugs are gapped at .034 with your Pertonix try .045 gap to start with then experiment with a wider gap of .050 or a little more if you want.
2. Point gap is set at .027 for the base generic setting you would want a end up with Dwell setting of 37 Degrees for best results. With your Pertonix unit you would ignore this setting.
3. Base timing is set to 6 degrees BTDC. I set them at 8 to 10 degrees to start with depending on your local conditions sometimes going up to 12 degrees. Any pinging drop back down until it stops.
4. With the engine warmed up to operating temps and the choke fully open. Set idle mixture to lean best idle. This done by setting to the highest Idle RPM and then only turning the mixture screw in a 1/4 turn (leaner).
5. Last set the Curb idle to 500 RPM for manual trans, 500 RPM for auto trans in drive with parking brake set, this will usually be 50 to 100 RPM higher when trans is in Neutral or Park.

The order of the settings can make a differance to the final tune this is why the carb settings are last thing. Are you confident that your carb is in good condition and with the float level is set correctly? Since the engine is new did you set the valve rockers correctly? Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

f100owner
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Joined: Fri May 09, 2014 11:11 am

Re: Steer me to plain tuneup direction

Post #3 by f100owner » Mon May 21, 2018 2:14 pm

Thank you for the response.
I did not rebuild this engine. A machine shop in San Antonio did (twice - but I won't go into why they did that).
I know I am off on the spark plug gap - pretty sure I was using the stock settings.
From what I have read, I should use the timing marks found on the passenger side of the engine, correct? Memory tells me there were timing indicators in two locations.
Texas;
1971 F100 - 240CID
2016 Ford Expedition
2015 Ford Fusion
2016 Harley - Ultra Limited.

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bubba22349
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Location: Flagstaff, Az. 86005 near the old Route 66

Re: Steer me to plain tuneup direction

Post #4 by bubba22349 » Mon May 21, 2018 3:32 pm

The stock plug gaps will work but if your coil is one of the recommended ones for use with the Pertonix then a wider gap is also of benefit. Yes some engines usally the later models will have two sets of timing marks one set (on passenger side) is used by emissions testing equipment (scope / analyzer that is used for a smog test). The Timing marks to use for a regular timing light are on the drivers side looking at the engine from the front of the truck. Good luck on your tuning :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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B RON CO
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Re: Steer me to plain tuneup direction

Post #5 by B RON CO » Mon May 21, 2018 10:19 pm

Hi, I don't know why you said you watch your engine sputter and smoke. It should run nice and smooth.
I would advance the timing, and then lower the idle. If it pings when you drive it, retard the timing a little.
Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
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