Question about 1991 Cadillac DeVille

Open Question

How to clean EGR tube and throttle body 93 deville

Posted by Anonymous on

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 255 Answers

SOURCE: 1992 Cadillac DeVille idling problem

Hi,you can run a fuel presure test to see if the fuel pump is working properly, you can also run a timing chain text ,this is a little complicated but you may be able to do it , take the distribuitor cap off,with a ratchet turn the crankshaft back and faward,if the rotor takes to long to move the chain is worn out,this can cause loss of power, I hope this will help.........

Posted on Aug 24, 2008

  • 5 Answers

SOURCE: I need to know how to change out the EGR Valve on

I have found this site most useful in repairing our car. You might try it too. I have posted it below.
http://en.allexperts.com/sitesearch.htm?cnl=Cadillac-774&terms=how+to+change+out+the+EGR+Valve+on+a+93%27+Cadillac+DeVille&Action.x=13&Action.y=4

Posted on May 05, 2009

  • 3 Answers

SOURCE: 1991 cadillac deville fwd 4.9 engine shudders hard

I have a 1991 Cadillac Fleetwood 4.9 120000 miles, I have the same problem. replaced plugs,wires,cleaned throttle body, and O2 sensor and have same problem. Taking it to a GM shop on 02/24/10.

Posted on Feb 23, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1998f1504.6wtriton runs fine but getting codes 401,171and174check all vacum lines,dpfe sensor,sprayed carb cleaner everywhere,new egr ,egr tube,took off elbow and throttle body cleaned it up no blockage...


Some of these intakes have a channel under the throttle body that supplies flow to the EGR. The channel is below the mounting plate for the air horn. Also clear the computer of old Codes.

Code 171 and 174 mean lean condition. It means more air is getting into fuel mix than is metered through air intake. Try using water spray bottle on all seams and Vacuum lines while engine runs and opening will draw in water and affect RPM.

Use water spray on Brake booster while engine runs. Bad diaphragm will leak Vacuum.

Finally, rear metal tube to DPFE has 2 short Vacuum lines which DPFE fits on. The metal tube goes to Exhaust. Some have a metal ridge on this tube. The ridge can leak Exhaust flow and affect the DPFE readings. Sometimes rust can build in this tube and it may need to be cleaned to restore flow.

Sep 28, 2013 | 1998 Ford Explorer

1 Answer

My cadillac deville has a code PO85 on it what does it mean


You just need to clean the throttle body. Take the air duct off and hold the throttle blades wide open (engine off). Spray the throttle bores beneath the blades with carb cleaner and scrub with an old tooth brush. clean the back side of the throttle plate also. The junk and gunk is plugging up the air flow past the blade at closed throttle and the idle speed control is running out of authority to open the blade. It just needs a thorough cleaning. Disconnect the negative battery terminal for 30 seconds when you are done to reset the idle learn offsets.

While you are in there and have the blades of the throttle body wide open....see those two tubes sticking up at you from the floor of the manifold?? Those are the EGR delivery tubes and they are NOT supposed to be full of carbon.... Rod them out with a piece of stiff coat hanger wire and carb spray to get them cleaned out.

Mar 12, 2012 | 1995 Cadillac DeVille

1 Answer

I have a 2000 caddy deville. my moter shake only when im stopped and not when i drive. i did a tuneup and it still shakes. can i be a bad coil pack or.......?


try checking the throttle body and look for lose hoses anywhere near it it might be a lose EGR valve anywhere near the throttle body. when disconnected or gunky or just plain out broken EGR's will cause the car to have a very rough idle.

Jul 11, 2011 | 2000 Cadillac DeVille

1 Answer

What does the code po85 mean for a 1994 cadillac deville


It means that the throttle body is dirty and the deposits in the throttle bores are restricting air flow at idle to the point that the idle speed control has no more authority to maintain the correct idle speed.

Take the air cleaner off, hold the throttle wide open and look down the throttle bores. Spray the throttle bores with carb cleaner and scrub the bores and backside of the throttle blades with an old toothbrush. Cleaning the deposits off the bores and throttle blade backsides it will restore the idle air flow to the correct level. When the throttle body is clean, disconnect the battery negative cable for 60 seconds to reset the idle learn offsets to the "clean throttle body" default values.

While you are in the throttle body and looking down the bores....see the two tubes sticking up at you from the intake manifold floor just below the throttle blades...??? Those are the EGR tubes and they are NOT supposed to be full of carbon and crud. Rod them out thoroughly with a piece of stiff wire to remove the deposits. Go all the way down thru the tubes to the cast passage below and make sure that they are clean and unrestricted so that the proper amount of EGR can flow.

Turning the key to the run position extends the ISC anticipating a restart, so if the setting is incorrect it would not erase a hard code. Just turning the key to run would light up both the service soon and service now lights as a bulb check, in other words, letting you know the bulbs work. Do you have the factory service manual?

The ISC adjustment is simple on this car. With the engine running and at operating temperature, You raise the throttle arm slightly with your right hand and push the shaft of the ISC in to fully retract it with your left hand. With constant pressure on the ISC shaft it will slowly retract. The very second it bottoms, you quickly remove the wiring connector to the ISC. Now you should have a very low idle and a gap between the throttle arm and the tip of the ISC. Approx. 0.060 of an inch. Once you know the gap is correct, shut off the engine, wait 10 seconds and reconnect the ISC wiring. Restart the engine and the ISC is set to spec. The TPS setting must be verified at this time. At minimum idle, ISC not touching the throttle arm, and unplugged, the TPS should be reading approx .0 or .1. Once the ISC is reconnected, you should see a TPS reading of approx. .5 at idle. with the A/C off.

A hard code can be erased but will continue to reset as long as the reason for it has not been corrected. Idle learn procedures were designed into later year engines with multi port fuel injection to adjust idle regardless of the amount of coke build up within the throttle body. Your fuel injection system does not build up coke or deposits because the 2 injectors spray down thru the throttle body, effectively cleaning the throttle body while running. Alot of owners adjust the ISC as if it were a throttle stop screw on a carb. guessing as they go. The ISC and TPS "MUST" be in sync to get the best off throttle response and smoothest idle. Adjusting the ISC without verifying gap or TPS voltage usually results in a surging or too high warm idle. You say the car failed at idle. For what reason? CO or HC? or idle too high?

Tell us news.

Jul 20, 2010 | 1994 Cadillac DeVille

2 Answers

1991 cadillac deville fwd 4.9 engine shudders hard under slight acceleration. replaced plugs,wires,cap,rotor button,ignition module,egr valve, cleaned throttle body, still have same problem


I have a 1991 Cadillac Fleetwood 4.9 120000 miles, I have the same problem. replaced plugs,wires,cleaned throttle body, and O2 sensor and have same problem. Taking it to a GM shop on 02/24/10.

Feb 13, 2010 | 1991 Cadillac DeVille

1 Answer

93 MX6 throttle body is Popping, loud,sounds like a diesel


Sounds like the pipe/connection from the exhaust manifold to the EGR valve that is located at or near the throttle body has a leak. That would make a loud popping noise.

Jul 15, 2009 | Maybach 62 Cars & Trucks

2 Answers

Check engine light on, 1997 cadillac Deville.PCM codes


PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.

May 07, 2009 | 1997 Cadillac DeVille

1 Answer

Code P0404 and P0135,Bank ONE sensor one has been replaced allready


Pull EGR & clean pintle with throttle body or carb cleaner spray & re-try. Erase codes after.

May 04, 2009 | 1997 Cadillac DeVille

Not finding what you are looking for?
1991 Cadillac DeVille Logo

Related Topics:

172 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

74896 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7688 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...