help please

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Nov 2, 2007 | 08:01 PM

capt.scott

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Joined: Nov 2007

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help please

How to tell if I have bad coils on my 2002 f150 supercrew with a 5.4 engine.

Thanks.

Nov 2, 2007 | 08:02 PM

built54

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Joined: Jul 2006

Posts: 6,282

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From: Farmington, MO

if its missing, cutting out, etc... what are you experiencing?

Nov 2, 2007 | 08:09 PM

capt.scott

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It shutters when it is in overdrive around 45-50 MPH and also hesitates when you first give it gas. Also some times when I start it the RPM and the Speedo max out and then come back to normal.

Nov 2, 2007 | 08:22 PM

F151

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The shudder at 45mph could be related to tired tranny fluid. My 2000 did this and a flush and fill cured it.. (at about 70k miles).
And isn't the gauge "sweep" normal?

Nov 2, 2007 | 08:26 PM

glc

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Joined: Dec 2006

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From: Joplin MO

Shuddering in OD at those speeds can either be the tranny or a low grade misfire. Have you ever gotten a CEL? If so, go over to Autozone and get the codes read.

Nov 2, 2007 | 08:31 PM

Mo Power

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Joined: Aug 2007

Posts: 168

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From: Wisconsin

I thought that the speedo and tach sweep only when the battery was getting low. Put a voltmeter across your battery terminals and check the voltage.

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