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1990 Mercury Grand Marquis LS 8.0/5.0 76,000 mi. Now 88,000 miles
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Cindyl541
User
Aug 1, 2011, 7:54 PM
Post #1 of 2
(2421 views)
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1990 Mercury Grand Marquis LS 8.0/5.0 76,000 mi. Now 88,000 miles
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1990 Mercury Grand Marquis LS 8.0/5.0 76,000 mi. Now 88,000 miles Edit | Quote | Reply
I just purchased this beautiful car in excellent condition and drove away. After about 200 miles, I began feeling just the slightest bit of a pull when going between 38-40 mph. Is this a transmission thing? What should I do? I've had nothing but unreliable vehicles and I really thought I picked a winner this time. I actually thought this little tug was normal when driving an automatic but friends assure me it's not. Ideas? Scoldings? Do I need a man? Like Really?
Cindy on the Oregon Coast
So, It's now about 1 1/2 years later and my car is still just as pretty as the first time I saw it. Problem is, it started acting up by roaring and jerking now and then for about a day then it died. I was worried it was the transmission but is there such thing as a shifter? My friend mentioned it and it's just what it needs. It wouldn't start for a while but the Ford folks couldn't make it die once we got it towed to them. They said they drove it around for a while but when I got it back, the thing would not shift. I'd get to about 40 and I thought it was going to blow up. Ford says they can't do anything because they don't know what it is. Any thoughts? I miss this place by the way...
Cindy in Silverton via the Oregon Coast
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 1, 2011, 8:41 PM
Post #2 of 2
(2416 views)
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Re: 1990 Mercury Grand Marquis LS 8.0/5.0 76,000 mi. Now 88,000 miles
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You probably have two different problems on this.
90 Merc uses an AOD transmission. The AOD is all mechanical transmission. The shift quality/shift delay is controlled by a throttle valve cable that has to be functioning and properly adjusted. The shift timing is controlled by governor pressure.
I do know that they had problems with shift linkage on those where the bushings in the steering column would wear out causing the shift tube to become sloppy. Sometimes the shift cable retainer bracket bolts would come loose at the base of the column. In that state it's possible the transmission's manual valve could be improperly positioned for the gear selected.
The stalling part could be from loss of fuel or spark, or IAC failure. Its also possible that a failing EEC relay could cause the engine computer to shut off while driving. You just have to determine which when the problem is occurring.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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