1989 Cadillac Deville with a "E48 EGR System Problem Code"

115

Asked by Aug 10, 2012 at 07:15 PM about the 1989 Cadillac DeVille

Question type: Maintenance & Repair

1st year Auto Tech student with a 1989 Cadillac Sedan Deville 4.5L V8 and a "E48 Exhaust Gas Recirculation System Problem Code" - My "Service Engine Soon" light comes on but not until i have driven it about 15 to 20 miles. I think it might be an exhaust leak and i just wanted to see what anyone else thought on what it  could possibly be? And is there any "proper" way to test an EGR Valve? Just in case that is what the problem is

1 Answer

72,345

First, check your vacuum hoses for the EGR system. If they are ok see if you can get your finger inside where the rubber diaphragm is. If you can, with the engine running at idle, press up hard on the diaphragm with your finger. This opens up the EGR valve & the engine SHOULD stall. If it stalls, the valve is sealing properly & the EGR passages are clear. You can do the same test using a hand held vacuum pump. Just disconnect & plug the vacuum hose at the EGR valve. Hook up your hand held vacuum pump directly to the EGR valve & pump it up. Again engine should stall. If the engine keeps running that means your EGR passages are clogged. You'll need to remove the EGR valve & clean these passages completely. Use a new gasket when re-installing your EGR valve. HTH. -Jim

4 of 4 people found this helpful.
Best Answer Mark helpful

Your Answer

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,250
  • #2
    Js08016
    Reputation
    1,960
  • #3
    Cynthiasmith
    Reputation
    1,740
View All

Related Models For Sale

Used Lincoln Town Car
35 Great Deals out of 1,737 listings starting at $1,099
Used Lincoln Continental
16 Great Deals out of 3,403 listings starting at $32,794

Used Cars For Sale

2005 Cadillac DeVille For Sale
3 Great Deals out of 234 listings starting at $2,495
2003 Cadillac DeVille For Sale
174 listings starting at $2,199

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.