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Old 05-12-2003, 06:59 PM
Registered User
Join Date: Nov 2002
Posts: 10
Question Slow Acceleration on 420 SEL

The car accelerates slow. It seems normal for regular city driving but if I need to accelerate quickly (pulling out into traffic) it is slow. It is as though there is no difference between when the pedal is half way down or all the way down. Also, if I am on the highway and go to pass it does not kick down. It will accelerate to high speeds but do it slowly. What could this be? O2 sensor? Or what about linkage--I do not put very many miles on the car and the linkage could get sticky I suppose? Any ideas? Thank You
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Old 05-12-2003, 07:48 PM
Posts: n/a
have you checked the fuel filters?
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Old 05-12-2003, 10:43 PM
3 MB's and counting!
Join Date: Apr 2001
Location: Toronto, Canada
Posts: 1,825
I have the same problem but maybe cause I have the slow 3.8L?
99 C43
98 S420
99 C230K
01 C240
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Old 05-13-2003, 03:12 AM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
if you press accelerator to floor should kick down into first if your kick down switch is ok. My Euro500 Se with Euro 420 engine is no Corvette eater off the line but given enough road,Oh well to late at night for braging........
William Rogers...........
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Old 05-13-2003, 12:40 PM
flixbiz's Avatar
Registered User
Join Date: Sep 2002
Location: Davidsonville, MD
Posts: 167
I used to get frustrated about the acceleration issue on my '91 420. I thought it was just a smaller engine issue because I've driven the 5.6 liter and it gave more of a kick off the line.

After I had the transmission serviced (fluid/filter change), I discovered that kick down had not really be working. It works now and while I don't get pinned to my seat, acceleration's better than it was.
1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)
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