This is topic 351 w/a 12-14min run time????? in forum Tech Talk at Northern California Ford Owners  .


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Posted by T-TopTerror (Member # 480) on :
 
My buddy put a 351 in his mustang. Now everything is stock on the ignition side except for the distributor(MSD). New battery, stock alternator. The thing will idle for only less than 15 min. then we can't get spark for 2 hours. WTF!!

Any suggestions would help at this time... Thanks
 

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Posted by st5150 (Member # 51) on :
 
TFI module and maybe the O2 sensors if it dies after 15 min. Check the codes in the EEC.
 

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Posted by T-TopTerror (Member # 480) on :
 
Oh ya, I've replaced the TFI cause that's what I thought. But the O2's? Why is that? We aren't getting spark?
 

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Posted by Blu50Stang (Member # 489) on :
 
Try a new coil
 

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Posted by st5150 (Member # 51) on :
 
O2's is for the dying after 15 minutes part. After 10-15 minutes, the O2's have warmed up enough and the EEC listens to the O2's to control the idle (amoung other sensors).

I'd still check the EEC for codes regardless.
 

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Posted by T-TopTerror (Member # 480) on :
 
Coils are good or bad...
Do you really think that the O2's after warmed up could cause the engine to die and not restart untill completly cooled? All we are missing is spark?
 

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Posted by mustanggt5091 (Member # 444) on :
 
one step at a time, first replace the coil and get some spark all the time! Check all the wiring and make sure there is no burnt wires or unconnected wires. Once you know you are getting spark all the time and problems still happen then go from there!
 

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Posted by cobraman_1994 (Member # 467) on :
 
is it the correct distrubuter for the 351?
this is karls car right?
 

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Posted by st5150 (Member # 51) on :
 

quote:

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Originally posted by T-TopTerror:
Coils are good or bad...
Do you really think that the O2's after warmed up could cause the engine to die and not restart untill completly cooled? All we are missing is spark?

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You could have two things wrong at the same time, that's all I was saying. Who says only one thing at a time has to not work right? Like others have stated, swapping parts with known good ones should narrow things down. Spark system is pretty small and easy to trouble shoot.... the TFI on/in the distrubutor tells the EEC to fire the coil. All 3 are easy swaps.
 

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Posted by BlueOvalRacing (Member # 1531) on :
 
It's most likely either the tfi module or the stator inside the distributor. If it has an aftermarket module, just tell him to trash it and get a Ford module. Stop by the shop sometime and I will lend you my tfi tester - that way you will know if it is the module.
 

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Posted by rokcrln (Member # 2536) on :
 
And just for info I have had a coil go intermitant on me before. Changed the coil and problem solved.
 

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