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Old 08-22-2004, 03:57 PM
KNIGHT07731's Avatar
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ford expedition

i have a 98 ford expedition, and it is running rough. the check engine light is not on but it cuts off in reverse. when i put it in reverse gear too quickly the needle drops below idle speed. when i step on the gas it takes off shaking then it just speeds up.at around 70mph it seems fine, but if i get to a light and i have to make a sudden stop it cuts off, but starts right up. can anyone tell me what i should check and how to check it

thanks

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Old 08-23-2004, 09:30 AM
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I dont understand why the check engine lite isnt coming on on your truck. The PCM should be able to see an engine miss and set the ck eng lite. Look at the #4 plug and cop (coil on plug) assy. There is a heater hose connector just above the cop assy that has a tendency to leak coolant on the cop and cause it to short and cause a miss. That is the most common issue on that vehicle. If it is leaking you will have to replace the coil, blow out excess coolant from the plug well and possibly have to replace the plug. You may have loosen and move the electrical junction bow at the firewall to access the hose connector. Disconnect the battery before moving the electrical box. If there is no coolant leaking on the cop/plug assy you need to get the codes checked.
(#4 cyl is located on the right rear of the engine)
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