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Old 05-11-2009, 16:55   #1 (permalink)
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1990 Mark VII Engine Surge

1990 Lincoln Mark VII LSC, Car idles fine in Drive or Reverse. When put in Park or Neutral it surges severely and stalls. If there is a power draw such as Air conditioning on, it will idle in Park or neutral. Idle Control Module has been replaced and Secondary Air Solenoids are working. Any ideas
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Old 05-18-2009, 08:18   #2 (permalink)
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Re: 1990 Mark VII Engine Surge

I'd suggest pulling the computer codes and having a poke around the Mustang forums as the engine is pretty much the same. It could be any number of things such as the MAF sensor is dirty. Having the codes should help you locate (or better understand) where the problem is. A sensor of some sort no doubt.

I have two 1988 Mark VIIs, so if you need me to confirm something I can take a peek at one of mine and get back to you.

All kinds of good info can be found by Googling 'Ford Fuel Injection'. The web site was especially helpful for me as it showed me how to read the computer codes and what all the sensors and actuators do.

A little knowledge is a dangerous thing!

:-)
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Old 05-22-2009, 16:30   #3 (permalink)
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Re: 1990 Mark VII Engine Surge

Wasn't aware I could hook up a code reader to this old doll. Thanks for the insight, of course always looking for the quick solution.
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Old 05-22-2009, 19:47   #4 (permalink)
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Re: 1990 Mark VII Engine Surge

The codes will actually be blinks of the Check Engine light. You have to make a jumper connection on the EEC plug and turn the ignition on. The codes will blink out and you can write them down. It is explained in detail at a couple of web sites, but the Ford Fuel Injection site is most helpful.

Good luck!
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Old 06-26-2009, 00:07   #5 (permalink)
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Re: 1990 Mark VII Engine Surge

you can get a code reader on ebay for Fords for about $20 for the older style OBD setup. i have one myself and it also performs a compression test on engine too to cut off injectors and spark to check if all cylinders are performing equally. it is made by Equus i think is the brand... has yellow face on controls
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