acree25 Posted March 3, 2004 Report Share Posted March 3, 2004 My 89 Deville exhaust smells like rotten eggs. It has been making this smell for a long time now and it really smells bad all the time. The only trouble code that comes up is for the "Vehicle Speed Sensor." This code only comes up after I have been driving on the freeway for more than 3 hours. Could this be a symptom of the rotten egg smell? Any help would be greatly appreciated. Link to comment Share on other sites More sharing options...
Playtime98 Posted March 3, 2004 Report Share Posted March 3, 2004 my guess would be a bad catalytic converter. from what i've read on this board, try banging on the cat and if it sounds like a bunch of rocks in a can, then it's bad. Link to comment Share on other sites More sharing options...
pulque Posted March 3, 2004 Report Share Posted March 3, 2004 I think the rotten egg smell could also be caused by excessive gasoline entering unmetered, causing a rich mixture. Im not sure of setup on 89 DeVille,but the cause is still the same. Check fuel pressure regulator first. Does your Deville have 8 injectors? Maybe one is leaking...I would check these, as they are mechanical/electrical parts and are prone to fail. Possibly using a fuel pressure dial/gauge will give you more information.If the pressure does not hold and drops very quickly after turning car off, this could indicate a leak. Good luck Link to comment Share on other sites More sharing options...
Bentham Posted March 3, 2004 Report Share Posted March 3, 2004 Also, maybe the o2 sensor(s) is/are bad -Eric Eric 93 Cad Seville 100K 95 Chev Blazer 143K [garaged summers] Link to comment Share on other sites More sharing options...
Dan Posted March 3, 2004 Report Share Posted March 3, 2004 I would have to say bad catalytic converter. Link to comment Share on other sites More sharing options...
Bentham Posted March 3, 2004 Report Share Posted March 3, 2004 I agree -- that was the problem with mine. -Eric Eric 93 Cad Seville 100K 95 Chev Blazer 143K [garaged summers] Link to comment Share on other sites More sharing options...
davedog Posted March 3, 2004 Report Share Posted March 3, 2004 I have the same smell with my 92 eldo and several people have said bad cat Crystal Red Tintcoat Exterior | Shale/Brownstone Interior | 32k Link to comment Share on other sites More sharing options...
acree25 Posted March 3, 2004 Author Report Share Posted March 3, 2004 This is great! I am getting so much input on this problem. I tried a couple of things today to try and see why this smell is happening. I banged on my cat. converter but nothing seemed to be rattling around. I checked to see if my injectors are leaking on the throttle body and it looked like nothing was dripping when I turned the key on. I was checking all of the vacuum connections around the throttle body and I found that the vacuum port coming out of the throttle body that leads to the purge valve on the charcoal cannister is not creating any vacuum at all. Could this be a problem that is leading to the rotten egg smell? If this might not be a problem, I will get a fuel pressure gauge to see if it might be the Fuel Presure Regulator. Thanks for all the input. I will keep checking this post for more great advice. Link to comment Share on other sites More sharing options...
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