Ford 90 Aerostar "Jerks" when driving


Old 03-14-09, 09:36 AM
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Ford 90 Aerostar "Jerks" when driving

The aerostar is the 3.0L version, automatic, with 105k miles. Recently it has begun jerking while driving, as if the thrust is cut out for a split second. It occurs both when accelerating and when at a constant speed (norm 45+ mph).
I recently had the transmission flushed and filter replaced and had some Lucas Oil transmission fluid added to the system.

Friends have recommended that I get the fluid replaced again. They say that not all the gunk gets cleaned out during the first flush. The fluid was dark and filter clogged according to repair guy prior to recent flush. I drove it x-country (TX-NV) after the flush with 1k lbs of stuff in the car. It was fine during x-country drive, but is acting up now.

Any ideas? Do I really need the trans flushed again or a new trans or something else?
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Old 03-14-09, 10:42 PM
Join Date: Mar 2009
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I would check with your fuel filter if it cuts out. Not too into Gas motors but if you loose power every now and then that may be an issue.

Could be missing also maybe. Whens the last time you changed plugs and wires?
Old 03-16-09, 10:38 PM
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I would get your motor mounts inspected.. they can cause jerking
Old 03-22-09, 05:57 PM
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Sounds like you may have a miss fire concern. 3.0l Aerostars were known for the distributer cap towers arcing under load. To check all you have to do is remove the engine access cover inside the vehicle. The dist. cap will be right there. Spray a light mist of water onto the cap/wires (don't soak them) then load the engine (AKA brake stand) and see if you can reproduce the concern. Also pull the spark plug wires off of the cap towers and see if they are corroded. If you find any problems, replace the cap, rotor, wires and plugs. Also suggest using OEM parts. I've had a lot of come-backs with after market parts on these. Good luck

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