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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 12-26-2010, 11:16 PM
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IDIDieselJohn IDIDieselJohn is offline
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Check Engine light flashing randomlly driving

'89 F150 300 Straight 6, C6, 62k miles

Been doing it for a couple days now, driving down (on the highway only) the Check Engine flashs randomlly, sometimes even looks like the bumps makes it light up, will stay on for a solid few seconds, then off, then flash again.

Seems to stay on solid whenever you really put your foot on the gas. Whenever theres a good load on the engine. Let off, light turns off, driving along @ 55mph flashes randomlly?



Could it be a loose contact/connector for something since it seems that the bumps affect it?


When I get off the highway, it's off and never comes on, not even with the bigest bump.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 12-26-2010, 11:30 PM
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timbersteel timbersteel is offline
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Have you pulled codes? Or get a friend or someone to sit in the driver seat while you wiggle the wiring.
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Old 12-26-2010, 11:36 PM
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I don't have a codes reader. Not right now anyways... never bother getting one, never had a computer controled engine before 7 months ago...

But the light is never on parked.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 12-26-2010, 11:53 PM
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Mine does that, it's my EGR sensor malfunctioning. IDK if that is the problem, but it could be it! ^_^
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Old 12-27-2010, 12:42 PM
Lazy K Lazy K is offline
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Ford Fuel Injection » How To Run a Self-Test Here is a link to instructions for getting any trouble codes without a code reader. The CEL does not have to be on for there to be trouble codes.
Might be worth doing.
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Old 12-27-2010, 04:49 PM
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my 95 bronco did the same thing going down the highway...inbewteen 55-65 the check engine light would come on until i slowed to about 45...do the self testvery easy to do...but in the test i found it easier to not do the slash marks...whatever works best for you though
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Old 12-27-2010, 05:15 PM
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My stang was doin that, was idle air control sensor . Best thing to do is self test like lazy k said
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Old 12-27-2010, 05:15 PM
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1989, 73, 73l, 89, blinks, check, engine, f150, f250, flashes, flashing, ford, light, service, ses, times

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