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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

Rough running engine at idle

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Old Jun 5, 2011 | 10:51 AM
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Rough running engine at idle

I have a 88 f250 and i replaced the dist. cap, rotor, spark plugs, spark plug wires, and the throttle position sensor and now when i put it in drive and let it idle while holding the brake it seems the engine has created a miss some how. Any idea?
 
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Old Jun 5, 2011 | 11:04 AM
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From: Des Moines
What type of throttle position sensor is it- adjustable or non-adjusting? See this page for the difference- Ford Fuel Injection » Throttle Position Sensor (TPS)

If it's adjustable, you may have not installed it correctly. Even if it's non-adjustable, it could be installed wrong. You need to make sure there is spring tension on the sensor when installing.
 
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Old Jun 6, 2011 | 08:29 AM
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What engine do you have? Check your spark plug wiring for correct firing order and make sure they are routed correctly. Cross-firing is a very common problem on these vehicles.
 
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Old Jun 6, 2011 | 10:02 AM
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From: Des Moines
Originally Posted by rla2005
What engine do you have? Check your spark plug wiring for correct firing order and make sure they are routed correctly. Cross-firing is a very common problem on these vehicles.
I thought of that too, and I could swear there is a diagram somewhere that shows us how our plug wires are supposed to be routed to avoid cross fire but I couldn't find it.
 
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Old Jun 6, 2011 | 10:57 AM
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Steve83 has some pics and info here: 1983 Ford Bronco Diagrams picture | SuperMotors.net for 5.0L plug wiring and firing order
 
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Old Jun 6, 2011 | 12:55 PM
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Yep, that's the one I was thinking about. Or at least something similar.
 
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