No start

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
hambone
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Re: No start

Post by hambone » Wed May 11, 2022 1:13 pm

What kind of electronic ignition do you have, swiss or prestolite?, the prestolite modules are known for the potting melting out and running down in your distributor, will gum up your advance also.
IMG_1284.JPG


Tech3140
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Re: No start

Post by Tech3140 » Wed May 11, 2022 1:14 pm

Damm....
I think we just about covered everything and still back to squeak one.

Ok, when you bought this A2, you started it up by turning on the ing switch. Then you pushed the start button on the floor. It started up and a few minutes of warmup, you pushed in the choke and you drove it home and parked it in your garage.

The next day..... Nothing. Engine cranks but refuses to start.

Correct ??

Tech3140
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Re: No start

Post by Tech3140 » Wed May 11, 2022 1:16 pm

Any bright flash of light followed by a mushroom cloud??

chevpol
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Re: No start

Post by chevpol » Wed May 11, 2022 10:23 pm

Yep.
Can't understand it, Drove home OK

Parked up, them next day wouldn't start.

chevpol
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Re: No start

Post by chevpol » Wed May 11, 2022 10:24 pm

Will check what electronic ign I have later today.

chevpol
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Re: No start

Post by chevpol » Wed May 11, 2022 11:36 pm

This is the empty box (well it contains a old set of points) that came with loads of spares I got with my a2.
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Rickf
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Re: No start

Post by Rickf » Thu May 12, 2022 4:44 am

Have you cleaned the plugs? I am going to back out of this at this point. You have three threads going on this and you keep trying to steer yourself and anyone that will listing towards the ignition even though all I have seen and heard points towards the carburetor and learning exactly how to start a M-151. IF those plugs are gasoline fouled they will give you problems from now on, maybe not serious problems if you clean them well but they will never be right. You need to get the plugs right before moving on to something else or you are going to get yourself into a hole you cannot dig out of. I have tried to help for a couple weeks now but you keep asking on other threads about ignition instead of following a set plan of diagnosis. I wish you the best of luck with it.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Tech3140
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Re: No start

Post by Tech3140 » Thu May 12, 2022 6:53 am

Yea, I’m going to have to back out as well.
Tried everything I know. Someone will need to look at your A2. I would suggest you contact the fellow who sold it to you.
Wish you the best of luck.

chevpol
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Re: No start

Post by chevpol » Thu May 12, 2022 10:34 am

Thank you both for your answers

Tech3140
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Re: No start

Post by Tech3140 » Thu May 12, 2022 10:42 am

Your welcome.

By the way, if you do find out the cause, please let us know. Love to see what me missed.

Rickf
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Re: No start

Post by Rickf » Thu May 12, 2022 4:35 pm

And a last tidbit, You got nowhere until you "sorted" the carb problems. I will guess that meant getting the return spring bracket out from under the carb base and eliminating the huge vacuum leak. After that you starting getting results but not before mentioning how you were starting the engine which would definitely flood it. Everything has pointed to a carburetor issue from the beginning. I am thinking even when you tried to start it after driving it home you probably flooded it on top of having poor batteries. You need to stay on one diagnosis until that is proven clean and clear before moving on to a different one. I don't like to give up on someone but after a while of watching them try over and over to go off the proper trail I just have to throw in the towel. If I were actually there in front of it then this would have been solved but with internet diagnosis the mechanic has GOT to depend on the owner to give proper feedback and to do what they are asked to do in the order they are asked to do it. It may not make sense to you but it makes all the sense in the world to the mechanic who has done this for 50 years.
So I strongly suggest you get the plugs as clean as you can, make sure your plug wires are on in the correct firing order as 3140 mentioned and go from there. Full choke for no more than 3-4 revolutions of the engine, part choke after that with a little throttle. Good luck.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

hambone
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Re: No start

Post by hambone » Thu May 12, 2022 5:43 pm

If you have access to a cabinet blaster, you can clean the plugs right up.

chevpol
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Re: No start

Post by chevpol » Thu May 12, 2022 10:22 pm

Thank you all for your frank and helpful replies,.

I think part of my problem is that I am in the UK, so at least 8 hours inftont of you. So whilst awaiting your replies, I come up with other solutions by myself.

For instance, a few hours after I posted about the spring bracket, I was sitting down and realised what I had done.

I will definitely get the plugs cleaned, but to as I am trying g all this on mu own vhecking the firing order might be difficult.

But I will persevere,

Starting I was told hold the choke open until it fires, then half choke. Will only use full choke until it had turned over 4 times. I live and learn.

Once again thank you for your advise.

Best regards

Mark

Rickf
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Re: No start

Post by Rickf » Fri May 13, 2022 5:13 am

The choke is something you have to learn, it is different for every vehicle. But, if it is adjusted correctly and it closes all the way when pulled out, then it will pull enough gas into the engine that it should fire within 4 revolutions. If it does not then either there is a fuel supply problem or something else. Pull the intake tube off after 4 revolutions at full choke and see if there is a lot of gas in there. There should be. also check to see that the choke is fully closed with the cable pulled all the way out. The last thing you want to do is gas foul the plugs. Which brings up another thing, make sure you have the intake hose to the air cleaner hooked up when doing all of this because it will contain the gas that would normally run out of the carb mouth.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Tech3140
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Re: No start

Post by Tech3140 » Sat May 14, 2022 11:59 am

We’re you trying to start your A2 with no choke ???

You’ll never get your Cold A2 started unless you have full choke. Once it catches, go half choke till it warms up. Yes, warms up. After that, you can push the choke all the way in.

Once the engine is warmed up, starting with no choke is easy, unless you’re showing off to your friends, then it won’t start at all.

So your A2 is fixed?? Or not ??


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