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Wrong firing order??? |
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1StopJeff 
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Joined: May-10-2012 Location: Granite Bay, CA Status: Offline Points: 43 |
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 Topic: Wrong firing order???Posted: May-14-2013 at 4:18pm |
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I bought a '91 Excel with a PCM 351 last summer and put 30 hours on it. I put a new Holley on it this summer and put a 450CFM instead of a 600CFM accidentally. The boat runs good except that it is hard to start when it is warm and there is a slight hesitation coming out of the hole.
So I checked the plugs and they look great and checked the rotor and cap and in doing so I noticed that the firing order does not match the tag on the motor. The tag on the motor: 18456273 actual firing order: 18724365 So any ideas why the firing order is different than what the tag shows? Could this be causing a problem? |
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1991 Nautique Excel
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baitkiller
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Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Posted: May-14-2013 at 4:46pm |
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Not a ford guy I would guess that the factory tag is LH and the running order is RH. Pure conjecture with no research.
I shall be soon held up or knocked down by those who know. Stand-by.... |
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Jesus was a bare-footer.............
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GlassSeeker
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Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Posted: May-14-2013 at 5:05pm |
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purely a guess, maybe since you accidently put a 450cfm on you might have accidently put the plug wires on wrong?
probably should follow the firing order on the engine. |
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This is the life
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Bri892001
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Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Posted: May-14-2013 at 5:17pm |
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First step is to confirm whether you have a Left Hand (Standard) or Right Hand (Reverse) rotation engine.
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1StopJeff
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Joined: May-10-2012 Location: Granite Bay, CA Status: Offline Points: 43 |
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Posted: May-14-2013 at 6:11pm |
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I am pretty sure that it is a LH rotation motor in this boat. I did not touch the plug wires when I replaced the carb, so this is the firing order it has been the whole time I have had the boat.
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1991 Nautique Excel
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21183 |
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Posted: May-14-2013 at 6:19pm |
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18456273 = RH 351w
13726548 = LH 351w 18724365 is not a firing order of a Ford Windsor of any sort, LH or RH. Hopefully you were mistaken when you determined your firing order. Tell us how you numbered the cylinders, and which direction you followed the distributor cap around. |
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1StopJeff
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Posted: May-14-2013 at 7:06pm |
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Thanks for chiming in TR. So I guess it is a RH 351w since the tag on the motor has the RH order that you listed.
So if I were looking at the motor from the back of the boat, which would be the front of the motor where the crank pully is, the left bank would be 1,3,5,7 and the right bank would be 2,4,6,8. I found the plug wire that went to plug number 1 and then went around counter clockwise. I did that because that is where plug #8 was connected. If it goes in the other direction then the firing order would be 15634278. |
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1991 Nautique Excel
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MartyMabe
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Joined: February-21-2006 Location: High Point,NC Status: Offline Points: 3980 |
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Posted: May-14-2013 at 7:12pm |
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Ford motor--- is 1,2,3,4 Right Bank 5,6,7,8, Left Bank. This is looking from behind the motor.
Looking from the front of the motor with the pulleys #1 is front left #5 is right front. |
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TRBenj
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Posted: May-14-2013 at 7:16pm |
Fixed it for you. Once you correct for your (Chevy layout) cylinder numbering, you have the correct FO (18456273). |
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1StopJeff
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Posted: May-14-2013 at 7:21pm |
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Yes, I am a Chevy guy. How silly of me to think that cylinder numbering was standardized.
 Thanks!
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1991 Nautique Excel
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Air206
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Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3000 |
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Posted: May-14-2013 at 7:28pm |
Ha! It's a Chevy guy looking at a Ford that's backerds in a V-Drive.... Enjoy your Excel - Fun boat! |
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1StopJeff wrote: