Question about 1990 Cadillac Deville

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How do i replace a freeze plug on 1990 cadillac deville next to firewall

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: replacing spark plugs

Changing spark plugs in your Cad is not an easy thing. I tried it using the chiltons manual and it took five hours. Just in case you want to try it yourself you will need to start by removing the engine cover (two screws easy to locate). Next step is the tricky and tedious part. A black cylider with small vacuum tubes located at the rear center next to firewall needs to be removed. It is attached to the engine by an somewhat difficult to reach bolt and a almost impossible lower bolt that can be acessed underneath if you can find it and have hand of a ten year old. I removed it from bottom of vehicle than tightened it after from the top this is by far the most difficult of the process watch your knuckles. This vacuum valve is connected to a silver hose which needs to be unscrewed to remove valve two screws attach it from the bottom. This is another difficult one. Make sure the your socket is firmly onto the wrench, one socket remains hidden after it fell off, making a extra trip to the store neccasary after losing it. Move valve out of the way as best you can and what remaing are 8 bolts holding on the "ignition coil assembly". These shoul be taken out in a "W" pattern: top bottom top bottom. Remove these and remove panel another very tight fit. Remove spark plug boots and take out spark plugs and keep in order so that spark plug damage can be assessed according to corrisponding cyclider. Repeat for front plugs and reverse steps to reassemble. Spark plugs come pregaped. Start with the rear plugs, they are the most difficult, and you have a better idea how much time it will take.

Posted on Sep 29, 2008

  • 1986 Answers

SOURCE: headlights need adjusting up on a 1990 Cadillac

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

Posted on Nov 04, 2009

jvvalleyjoe
  • 2 Answers

SOURCE: fuse box diagram picture for 1990 cadillac deville

your best bet is to go to your choice of auto repair store and purchase a Haynes Repair Manual for GM it covers the Cadi, Olds Toranado and the Buick Rivi 86-92, its located in the back section of the book youll have no problem locating it.

Posted on Dec 20, 2009

honeymokey
  • 3113 Answers

SOURCE: how to change fuel filter 1990 Cadillac deville

Get car on a lift as the filter is under car close to where your gas pedal foot may rest. Two open end wrenches will take it apart.

Posted on Apr 06, 2010

duane_wong
  • 6826 Answers

SOURCE: 1990 cadillac deville 4.5l runs rough and

Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.

The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.

Posted on Jul 02, 2010

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2 Answers

How to change freezes plugs on a 93 Cadillac Deville


http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/113670-freeze-plug-replacement.html

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How to replace the freeze plugs on the head facing the firewall on a 2003 deville 4.6


IF you have no room to maneuver the tools required to do the job. the quickest option will be to drop the engine gear box assembly to a point that you can do the job. Make sure that if you do this to replace all the plugs because if one is leaking the rest will not be too far off leaking also

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Hi I own a 1990 Cadillac Deville 4.5 MPI recently the catalictic converter became clogged so I removed it replacing it with a straight pipe then it ran like **** so replaced spark plugs checked contin


First I should warn:: straight pipe can get you in trouble with the law. But what has happened is your car uses a o2 sensor to monitor the flow of air in the system. By removing the converter you have disrupted the flow and now the engine computer is receiving the wrong readings and telling the fuel system to enrich causing spark plugs to fowl. You will have to return the balance to correct the problem or change the chip in the computer.

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Turn signals and hazards wont work on my 1990 Deville fuse is fine. what next?


It sounds to me that your turn directional switch located behind the steering wheel has failed (was a common problem in those years) If you have an airbag in the wheel then the switch is called a clock spring. To test unplug the connector under the dash going to the switch and plug in a new switch. and manually turn the new switch back and forth to see if systems work.

Dec 29, 2012 | 1990 Cadillac Deville

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How much should i gap the sparks to


The gap on spark plugs for the 4.5 fuel injected motor on a 1990 Cadillac Deville is 0.060

May 05, 2012 | 1990 Cadillac Deville

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My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.


Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.

Remember to install sealant after flushing out the system to prevent leaks.

Jan 25, 2011 | 1992 Cadillac DeVille

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Feb 16, 2010 | 1990 Cadillac Deville

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Where is the heater motor module located on 1998 Deville?


Attend the parts department of a Cadillac dealer and they can print the page showing the location. I found mine on my own on a 1995 Oldsmobile Aurora under the dash on the passenger side near the upper edge of the carpet in the venting. You should look at any one at the parts department to see what they look like. There is only the outer surface where the connector attaches in sight. The largest part is out of sight. It was about 2 inches from the blower motor. If you are very agile with only one hand on tools and body contorted you can take it out of a Cadillac at a wrecker and install it in your car. Next time I do it I will remove the front seats and then I can use two hands on the tools. My 1990 Cadillac had it located in an easy spot under the hood in the venting attached to the upper center firewall. Two screws and it was easy to replace with trial ones at the wrecker until I found one that worked. The newer Cadillac may not be as easy.

Jan 21, 2010 | 1998 Cadillac DeVille

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1990 cadillac deville 4.5l runs rough and missfires. Checked fuel pressure and for vac. leaks, both ok. have replaced plugs, wires, cap, rotor, performed injection service. no results. Hooked to scope and...


Had a computer on my 1990 Cadillac Deville bad, after changing plugs, wires, cap, fuel injectors, egr valve, etc.

The computer was not firing an injector and i had a miss and rough running mostly at 35 mph on the roads. It bucked like a bull.in a rodeo.

Aug 02, 2009 | 1990 Cadillac Deville

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