Question about 1994 Cadillac Fleetwood

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Engine Idle High/Loss of overdrive and third gear

1994 Cadillac Fleetwood - LT1 engine began Idling high and lurches when put into gear. When in normal drive, it stay's in first gear and then floats around like it's hunting the next gear. Can only reach 1st and 2nd gears manually.

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Did you check for vacuum leaks? vacuum leak will cause a higher rpm , and some use vacuum to shift transmission,

Posted on Oct 28, 2008

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May be bad gas...but probably an ignition module or crank position sensor...you need a mechanical diagnosis...

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Dec 11, 2013 | Toyota Cars & Trucks

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Rpm are way high. at 60 miles an hour the overdrive kicks in, rpm shoot up to 4000


Either the torque converter isn't staying locked-up
or your in third gear,not od, as you suggest.

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So you know you have to go to a trans shop

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1989 cadillac seville. when engine warms up, the idle rpm rises to 1700-1800 rpm. stays at high rpm even when put in gear. changed the idle control motor and adjusted according to the manual. no...


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1985 cadillac fleetwood 4.1 will die when you slow down


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I would advise you to clear the trouble codes (by pressing the off and high buttons on your climate controll while in diagnostic mode). To go in diagnostic mode just press off and warmer buttons on the climate controll as you probably also used to read out the diagnostic codes.

If this codes reoccurs there is a problem in the power supply to your ECM which will make it forget the correct settings. Result is it has to find correct settings for idle everytime and you will lack power as it has to find out how much gas can be injected at different RPM's. This happend to me when my battery was dying on me last winter. Replacing the battery (I couldn't start anymore) fixed this problem for me. If your battery is ok I would expect a bad wire somewhere.

Best off luck fixing your problem.

Apr 03, 2009 | 1985 Cadillac Fleetwood

1 Answer

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1 Answer

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