Tune made shudder worse

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12-08-2013, 09:30 AM

#11

maupin442

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It was definitely a miss fire. But it has stopped completely now.

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12-08-2013, 11:38 AM

#12

Kenferg1

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Quote:

Originally Posted by maupin442

Changed the plugs today. Put in Motorcraft Iridiums gapped at .030. The old plugs were badly burnt out and gapped between .045 and .050. Truck runs amazing! No shudder at all. Runs smoother than when I bought it. Thanks for all the help!!!!

Does anyone know why the EB engine burns plugs so quickly? A100,000 mile interval seems to be wishful thinking on Ford's part. Surely they experienced this in their testing.

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12-08-2013, 11:56 AM

#13

Ssls6

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Quote:

Originally Posted by Kenferg1

Does anyone know why the EB engine burns plugs so quickly? A100,000 mile interval seems to be wishful thinking on Ford's part. Surely they experienced this in their testing.

Weak coils could be the problem. A small gap and fresh electrode edges are compensating for weak voltages.

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12-08-2013, 03:59 PM

#14

brucesears

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Boosted engines put additional stress on plugs and coils. Boost can blow out the spark on plugs with too wide of a gap. These plugs are just fine to about 35K miles if the gaps are set at 0.030 or a bit narrower. I can remember the 70's with disgust, my old 70 Mustang with the 428 CJ had to have new plugs about every 5K miles. Either plugs or points would cause misfires after that.