40* btdc... does it matter? - Vintage Mustang Forums
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post #1 of 14 (permalink) Old 02-27-2019, 06:39 PM Thread Starter
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I have 302 i pulled from a 90 mustang it ran fine when we pulled it out. It uses the 1,5,4 2.... firing order when i found tdc the timimg mark was on 0.
For some reason it only wants to start when the timing is around 40* when i try less the timing is off and it wont start.

The long white line is 0 the short line is 10*. There is a hard to see black line that is 30*

Can anyone think of why this is? And does it matter

https://youtu.be/bVHBt-2oqMA

Last edited by wscott00; 02-27-2019 at 06:46 PM.
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post #2 of 14 (permalink) Old 02-27-2019, 06:49 PM
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Something (balancer) has moved. No way thatís right.

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Patrick
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post #3 of 14 (permalink) Old 02-27-2019, 06:51 PM Thread Starter
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Is there a way to find out if the balancer has moved and put it back
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post #4 of 14 (permalink) Old 02-27-2019, 07:21 PM
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Is the 40 with the vacuum hooked up to the distributor? You check initial with it disconnected and plugged. Or are you using the distributor that came with the EFI engine? If you are you have to disconnect the SPOUT connector when checking initial timing on that one.

1967 Mustang Convertible, 289-4v, C4, Edelbrock Performer Intake, Mild Cam.

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post #5 of 14 (permalink) Old 02-27-2019, 07:26 PM Thread Starter
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I'm using a msd probillit distributor and 6a box, and ez efi. It had a carb
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post #6 of 14 (permalink) Old 02-27-2019, 07:31 PM
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Quote:
Originally Posted by wscott00 View Post
Is there a way to find out if the balancer has moved and put it back

Yes, find TDC and check the balancer to see where it is.

Paul
1965 Mustang 2+2
1968 Mustang California Special
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post #7 of 14 (permalink) Old 02-27-2019, 08:05 PM
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did you use a real piston stop to find TDC (or a real stop using the spark plug hole)?

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post #8 of 14 (permalink) Old 02-27-2019, 08:07 PM
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Various 302 engines came with different timing covers, timing pointers, and corresponding crank dampers.
You might have the correct dampener with the wrong pointer. Or vice versa.

The attached picture is just one example.
Attached Images
File Type: jpeg D33498DD-2285-4740-A525-811C3D16FEF9_1551316043981.jpeg (209.3 KB, 10 views)

1970 Mustang coupe
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post #9 of 14 (permalink) Old 02-27-2019, 08:08 PM
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if that firing order is really 15426378, then that motor definitely isn't stock.
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post #10 of 14 (permalink) Old 02-27-2019, 08:12 PM
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Also, are you sure the firing order is 15426378?
If so, someone put a different cam in there. (Probably not a roller cam)

1970 Mustang coupe
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post #11 of 14 (permalink) Old 02-27-2019, 08:13 PM Thread Starter
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I didn't use a piston stop. Just bumped it over till I felt the air push. I started around 10* and kept turning and turning the distributor till she turned over. St about 40* it starts everytime with no problems. At 30* it tries but cant, at 20* nothing happens
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post #12 of 14 (permalink) Old 02-27-2019, 08:15 PM Thread Starter
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Quote:
Originally Posted by MrFlash View Post
Also, are you sure the firing order is 15426378?
If so, someone put a different cam in there. (Probably not a roller cam)
Yep. I tried the other firing order it doesnt want to start

Last edited by wscott00; 02-27-2019 at 08:19 PM.
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post #13 of 14 (permalink) Old 02-27-2019, 08:24 PM
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Originally Posted by wscott00 View Post
I didn't use a piston stop. Just bumped it over till I felt the air push. I started around 10* and kept turning and turning the distributor till she turned over. St about 40* it starts everytime with no problems. At 30* it tries but cant, at 20* nothing happens
really should use a stop.....
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post #14 of 14 (permalink) Old 02-27-2019, 08:48 PM
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ALL the 5.0HO's (and 351W) used the 1-3-7-2-6-5-4-8 firing order, unless somebody has changed the camshaft.

On Ford's, number 1 cylinder is the front cylinder on the PASSENGER side. Are you sure you aren't looking at it like a Chevy? LOL.
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Bart

What, me worry?
- Alfred E. Neuman

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