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Sedans Cadillac DeVille Cadillac DeVille
2506 messages, Last post on Sep 27, 2009 at 12:50 AM
You are in the Cadillac DeVille Forum. Your Hosts are pat & karens
Having a few problems with my caddy. Rough idle, surging at 30 to35 mph then smooths out. Have been told that it might be the electronic throttle positioner. This vehicle only has 96,000 miles on it an is in show room condition. I've changed the plugs,wires,cap,rotor. Also the catyletic convertor changed out,all the filters,except the fuel filter. only run premium fuel in it. It has The 4.9 V-8 engine in it. Some please help me in this matter. I'm stumped and almost ready to take it and have a diagnostic ran. There is no service engine light on or anything telling me if anything is wrong. Can it be the E CM has gone faulty?
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Replying to: toneyg (Dec 31, 2007 2:47 pm) If so, there are 2 air passages in the bottom of the intake that clog with carbon and cause dirveability problems such as you are having. These passages can be seen by looking straight down into the throttle body. Use a probe or screwdriver to clean these passages and your problems might go away. Otherwise, yes, the idle control and/or throttle position control (some cars have both of these) can go bad and cause problems. I'm not sure these type problems would continue until 30/35mph. If these are the problem/s, I think replacement is rather simple, take off the old ones, put on new ones. BUT, getting them re-set so they work well is a real mess, best left to a mechanic who understands them, or has factory service manual to follow the procedures. There is also MAP sensor could be bad or the Exhaust Gas Recirculation (EGR) valve that could be also clogged or bad. Finding a mechanic with experience on this age Cadillac might be your best bet to narrow down exactly is your problem. Or, if you was to pursue it yourself, buy the factory service manual, not one of the after market ones.
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Replying to: bockscar (Dec 06, 2000 1:11 am) |
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Replying to: bolivar (Jan 02, 2008 11:27 am)  http://answers.edmunds.com/question_95_cadillac_Deville_oil_bell_housing_valve_c- overs_where_552.aspx
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Replying to: KarenS (Jan 02, 2008 3:49 pm)
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Replying to: bolivar (Jan 02, 2008 4:31 pm) 
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I have a 1989 deville, the radiator fan stays on all the time even when the key is off until the battery dies, just started doing it out off nowhere. Any help would be greatly appreciated. thanks
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Replying to: noyesfranka (Jan 06, 2008 12:50 pm) |
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Replying to: noyesfranka (Jan 06, 2008 12:50 pm) |
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1992 Cad Deville 99Kmiles runs great 19 per gal. It has a problem with stalling making right hand turns when the fuel tank gets to 5 gals or less.. It it possible that the fuel pump is on the right side and the turn depletes the gas. Has anyone else experienced this issue. I don't know if this is related - once in a blue moon the ignition will not work. It sets a few minutes and then it will engage. Anyone ever had this problem ????- The fuel pump issue should be a common one if my theory is correct. Help from anyone - Please
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