Won't start, and looking for help.
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New User
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Won't start, and looking for help.
Ok guys,
I've got spark, fuel and air but the sucker still won't start.
Its a 300 I6 inside a '69 F100.
Also, the starter seems to be cranking over just a little bit slowly but only in a few spots.
Throw the suggestions out.
I've got spark, fuel and air but the sucker still won't start.
Its a 300 I6 inside a '69 F100.
Also, the starter seems to be cranking over just a little bit slowly but only in a few spots.
Throw the suggestions out.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
The irregularity in the cranking speed is due to damage to the flywheel ring.
We will need more info on the starting problem to help you out. Has it recently run? Did you do any work to it recently?
We will need more info on the starting problem to help you out. Has it recently run? Did you do any work to it recently?
Elder User
Joined: Jan 2002
Posts: 780
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Don't forget timing
In addition to the three things you mentioned, you must also have correct valve timing and ignition timing. Poorly adjusted ignition timing can cause your turnover sympton. Step one is to get No. 1 cylinder to top dead center on the compression stroke, then pull the distributor cap and see if the rotor is pointing to No. 1 plug.
Elder User
Joined: Jan 2002
Posts: 780
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Don't forget compression
It sounds like you have an ignition timing problem, but remember that you must also have good compression on all cylinders for it to run correctly. A compression test will tell a lot about the condition of the engine.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Pull the coil wire off the distributor and crank it again. If you still have the intermittent slowing, you have damaged teeth on the flywheel ring. If that problem goes away, you have too much advance and are kicking the pistons back down before TDC as David suggests. Recheck the clock angle of the distributor in the hole, retard the spark and try again. Retime.
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Compression tests good across all cylinders at 135-137.
Part of the problem with the turning over was a weak starter even though it was testing good at the local part's monkey shop.
Also, started working on the timing issue but wasn't able to get too far before I ran out of time.
Did get it to turn over and start to fire, however I started shooting flames out of the carb then got things dialed in a bit more but it was still running too rough.
Anyone have the firing order for the 300 off the top of your head?
Thanks guys.
Part of the problem with the turning over was a weak starter even though it was testing good at the local part's monkey shop.
Also, started working on the timing issue but wasn't able to get too far before I ran out of time.
Did get it to turn over and start to fire, however I started shooting flames out of the carb then got things dialed in a bit more but it was still running too rough.
Anyone have the firing order for the 300 off the top of your head?
Thanks guys.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
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Senior User
Joined: Sep 2009
Posts: 198
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From: Burbank, CA
Shooting flames out the carb is a classic symptom of the timing being seriously retarded.
Did you read this other thread? https://www.ford-trucks.com/forums/9...-wont-run.html
We talked about the common problems with vacuum advances, bad timing marks, etc.Your situation sounds similar to his.
Did you read this other thread? https://www.ford-trucks.com/forums/9...-wont-run.html
We talked about the common problems with vacuum advances, bad timing marks, etc.Your situation sounds similar to his.
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Alright guys, I read the thread that was suggested to me and it didn't help a damn bit. (good reading though)
Went out there today and fiddled with the timing a bit, got her to start but it was a real rough idle and wouldn't stay running long enough for me to hop out and fiddle with timing while it was running.
It would then die even with my foot the floor and pumping the gas...sputter real loud then just stop running.
I'm bout' ready to just pull the dizzy set it back to TDC and drop it back in and see if that helps at all.
Went out there today and fiddled with the timing a bit, got her to start but it was a real rough idle and wouldn't stay running long enough for me to hop out and fiddle with timing while it was running.
It would then die even with my foot the floor and pumping the gas...sputter real loud then just stop running.
I'm bout' ready to just pull the dizzy set it back to TDC and drop it back in and see if that helps at all.
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Set the motor to TDC and pulled the dizzy as well as the spark plugs so I could check this.
Dropped the dizzy back in, put the plugs back in...hooked up the wires and fired her up.
Ran great for about 30 secs before she died, acted like she wasn't getting fuel so I checked this with a bottle at the end of the fuel pump and filled the sucker pretty quick, also plugged an inline clear filter to see how the fuel was acting and things looked good that way.
So I'm back here asking for help, so throw out those ideas and i'll check them out.
Dropped the dizzy back in, put the plugs back in...hooked up the wires and fired her up.
Ran great for about 30 secs before she died, acted like she wasn't getting fuel so I checked this with a bottle at the end of the fuel pump and filled the sucker pretty quick, also plugged an inline clear filter to see how the fuel was acting and things looked good that way.
So I'm back here asking for help, so throw out those ideas and i'll check them out.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
What's left? Vacuum leaks? Hung carb float? Your problem sounds like fuel starvation.
Try tightening down the intake manifold and carb mount bolts and anything that screws into vacuum plugs. Pull and plug the vacuum lines one by one.
Try tightening down the intake manifold and carb mount bolts and anything that screws into vacuum plugs. Pull and plug the vacuum lines one by one.
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So I took a closer at my carb, it's a Holley 1 bbl with these markings but I couldn't find anything when I took a look in a Holley carb book.
6R
3625
B
A-1
Can anyone give me a hand id'ing this sucker?
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