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

85

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

67,415

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

Your Answer

Add photo

Related Questions

  • 1989 Cadillac Deville with a "E48 EGR System Problem Code" 1 answer

    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...

    1989 Cadillac DeVille

    -

    Maintenance & Repair

  • Should i buy a cadillac with over heat problem 3 answers

    He only wants 300 says his micanaic looked at it just needs water pump but also the check engine lights on just don't want to make a bigger problem for myself

    2000 Cadillac DeVille Base

    -

    Maintenance & Repair

  • License plate panel for a Cadillac DeVille 1 answer

    I need to find a license plate panel for a 2001 Cadillac DeVille. We broke the backup light lens and need to replace the whole panel. Any info. on where I can buy one, other than a dealership(they w...

    2001 Cadillac DeVille

    -

    Maintenance & Repair

  • Hi i have a 2002 cadillac deville 4 answers

    I had not left the house in days didnt turn my car on i jump in and it dead i tryed jumping it i even charged da battery at a store now itz sayin starter disabled remove key what does dis mean pls...

    2002 Cadillac DeVille Base

    -

    Maintenance & Repair

  • 2001 Cadillac deville 2 answers

    My Cadillac deville (2000) won't start I have replaced the starter and the crank shaft sensors a&b also when I turn the key all the lights on my dashboard light up however when I turn it to on it ...

    2000 Cadillac DeVille Base

    -

    Maintenance & Repair

Search Cadillac DeVille Questions

Cadillac DeVille Experts

#1 kikero
kikero
Reputation 2,140
#2 Js08016
Js08016
Reputation 1,820
#3 Cynthiasmith
Cynthiasmith
Reputation 1,580
View All

Related Models For Sale

Used Cadillac Eldorado
349 listings starting at $2,450
Used Lincoln Town Car
34 Great Deals out of 1,791 listings starting at $1,500
Used Cadillac Seville
3 Great Deals out of 330 listings starting at $1,100
Used Chevrolet Corvette
149 Great Deals out of 20,681 listings starting at $3,995
Used Ford Mustang
543 Great Deals out of 45,845 listings starting at $1,999
Used Chevrolet Camaro
242 Great Deals out of 31,193 listings starting at $369
Used Lincoln Continental
6 Great Deals out of 5,051 listings starting at $37,988

Used Cars For Sale

2005 Cadillac DeVille For Sale
234 listings starting at $2,450
2003 Cadillac DeVille For Sale
205 listings starting at $1,988

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.