Intermittent no start condition

John Nechiporchik · 09-16-2013, 02:49 PM

Thanks for the ideas. What fails on the optispark? I've seen references to this before as a problem area.

Thanks

Steve Williams · 09-16-2013, 04:14 PM

Quote:

Originally Posted by John Nechiporchik

Thanks for the ideas. What fails on the optispark? I've seen references to this before as a problem area.

Thanks

The optical sensor gets knocked out usually by a foreign substance. Oil, water. A quick continuity check of the harness should be done. Manipulate the wires as you do this. They can and do go bad as well.

John Nechiporchik · 09-16-2013, 05:45 PM

This thing has an MSD Distributor Cap,coil (HVC2) and crank trigger.

Dave Noll · 09-16-2013, 05:59 PM

...

FED 387 · 09-16-2013, 06:26 PM

Try a different coil---this typical of a MSD 8261 coil ---they cannot take a continous start and stop round after round like this without overheating and doing exactly what you are describing--- been there done that--- problem should be solved---FED387

John Nechiporchik · 09-16-2013, 08:15 PM

Started it tonight....fired right up. Ran for a minute.....shut off.....tried again 5 times over the next 3 hours....no start.
FED....would you recommend another P/N coil or get another 8261?

Also, I recall previously that the fuel regulator seemed to stay near operating pressure for quite some time after the pump/engine was shut down. This regulator (Paxton) is immediately bleeding off instantly after the pump is shut off (engine NOT running) Drops to 15 psi (set at 45) in about 3 minutes.
Wondering if this is the problem?

FED 387 · 09-16-2013, 08:52 PM

try any other coil other than another a MSD 8261 if you are going to run more than a lap every hour or two just to see if that is the problem--- for repeat operation much like stock/super stock/ bracket cars go DO NOT USE the MSD 8261 it will usually do what you are describing---an MSD 8251 will not cause the symptoms you are describing---an MSD8261 coil gets so hot internally with repeat operation it breaks down due to the heat--- if you ran the car for a lap then shut it down for a while say 30 +minutes then ran another lap you MIGHT be OK but the MSD 8261 coil is not designed for lap after lap

09-16-2013, 02:49 PM	#1
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 85 Liked 13 Times in 7 Posts	Re: Intermittent no start condition Thanks for the ideas. What fails on the optispark? I've seen references to this before as a problem area. Thanks

09-16-2013, 05:45 PM	#3
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 85 Liked 13 Times in 7 Posts	Re: Intermittent no start condition This thing has an MSD Distributor Cap,coil (HVC2) and crank trigger.

09-16-2013, 05:59 PM	#4
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 712 Likes: 2,716 Liked 240 Times in 112 Posts	Re: Intermittent no start condition ... __________________ Dave Noll, EF/S ,?/SA 6526 Last edited by Dave Noll; 10-16-2013 at 05:06 PM.

09-16-2013, 06:26 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,429 Likes: 563 Liked 336 Times in 183 Posts	Re: Intermittent no start condition Try a different coil---this typical of a MSD 8261 coil ---they cannot take a continous start and stop round after round like this without overheating and doing exactly what you are describing--- been there done that--- problem should be solved---FED387

09-16-2013, 08:15 PM	#6
John Nechiporchik Member Join Date: Mar 2007 Location: Grosse Ile Mi. Posts: 316 Likes: 85 Liked 13 Times in 7 Posts	Re: Intermittent no start condition Started it tonight....fired right up. Ran for a minute.....shut off.....tried again 5 times over the next 3 hours....no start. FED....would you recommend another P/N coil or get another 8261? Also, I recall previously that the fuel regulator seemed to stay near operating pressure for quite some time after the pump/engine was shut down. This regulator (Paxton) is immediately bleeding off instantly after the pump is shut off (engine NOT running) Drops to 15 psi (set at 45) in about 3 minutes. Wondering if this is the problem?

09-16-2013, 08:52 PM	#7
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,429 Likes: 563 Liked 336 Times in 183 Posts	Re: Intermittent no start condition try any other coil other than another a MSD 8261 if you are going to run more than a lap every hour or two just to see if that is the problem--- for repeat operation much like stock/super stock/ bracket cars go DO NOT USE the MSD 8261 it will usually do what you are describing---an MSD 8251 will not cause the symptoms you are describing---an MSD8261 coil gets so hot internally with repeat operation it breaks down due to the heat--- if you ran the car for a lap then shut it down for a while say 30 +minutes then ran another lap you MIGHT be OK but the MSD 8261 coil is not designed for lap after lap

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