brcree Posted November 16, 2015 Report Share Posted November 16, 2015 1994 Deville 4.9. My eng. has started to have a slight stall miss when going up hill...any suggestions? Link to comment Share on other sites More sharing options...
James Woods Posted November 16, 2015 Report Share Posted November 16, 2015 Maybe the fuel pick up in the tank has become loose, or the fuel pump filet sock is really plugged except forward the top side. But either of those would only be at a lower fuel level. Anything over 1/2 tank it shouldn't change. Our it could be you only notice it up hill due to increased engine load. Could be doing it anytime extra load is on engine. Our option b only drive downhill Lol Link to comment Share on other sites More sharing options...
brcree Posted November 16, 2015 Author Report Share Posted November 16, 2015 Good info there Jw.......down hill....yeah....that works. Thought it could be an O2 sensor. Link to comment Share on other sites More sharing options...
James Woods Posted November 16, 2015 Report Share Posted November 16, 2015 O2 sensor just reports back to computer what the engine is doing. I'd an o2 sensor fails the computer just goes to a closed loop mode and wouldn't give a miss fire. A lot of times with any engine problem there will be o2 codes due to overly rich or lean exhaust, doesn't mean o2 sensor needs replaced it usually means they are working properly. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 16, 2015 Report Share Posted November 16, 2015 If there are no codes that tell the tale, I would start with the distributor cap and rotor, then the plug wires. How many miles are on the plugs? -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
brcree Posted November 16, 2015 Author Report Share Posted November 16, 2015 The plugs do need changing......the car itself has over 240,000 on it...I replaced the coil a few months back....rotor and cap looked ok then. Will check out the wires tonight. Link to comment Share on other sites More sharing options...
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