PAUL T Posted December 12, 2017 Report Share Posted December 12, 2017 My 2004 Deville has been running rough lately, then last week we got gas at a local Sams Club. I should have went somewhere else when I saw the bags on some of the pumps. I ended up filling it up, then we stopped a few miles down the road for snacks and when we got back on the road and was sitting at a light it just died. My wife tried to start it a few times to no avail. Then after a few minutes she tried it again and it started but it was running rough. She kept the rpm's up until it smoothed out and we headed home. I suspected bad gas then. It ran ok for about a week and I filled it up again at another station, it ran good a few more days then died on me at home. I managed to keep it running enough to back it into the driveway. I went out this morning and it would not start. I put some dry gas in it and tried to start it again but no luck. It would fire occasionally but no start. The current codes are: P0171, P0174, P0897. The history codes are P0300, P0410, P0463, P0748, P01106, P0520, P2507. Where do I start? Link to comment Share on other sites More sharing options...
Logan Posted December 12, 2017 Report Share Posted December 12, 2017 I kinda thought the same thing when my 2001 did it. Just after filing up.....rough running....SES lamp...was it bad gas? Anyway...171 and 174. Both banks running lean codes. Could be failed rubber coupler under the intake. Cadillac only part....about $20. Intake has to come off the replace. It will look ok from above....it will be rotted out on the bottom. Bad ones cause 171 and 174 all the time. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
PAUL T Posted December 12, 2017 Author Report Share Posted December 12, 2017 I have already changed that a few years back. Could it be bad again? I also changed the elbow on the right side of the intake earlier. I might have to check the intake bolts in case of vacuum leak. Link to comment Share on other sites More sharing options...
PAUL T Posted December 12, 2017 Author Report Share Posted December 12, 2017 I went back and checked the forum and realized that I had changed the boot on my 1n-laws 2003 not my 2004. So that is where I will start. Thanks Logan. Link to comment Share on other sites More sharing options...
rockfangd Posted December 13, 2017 Report Share Posted December 13, 2017 dont forget to check your fuel pressure. your pump may be weak. also could be burnt plug to it. Seen nearly every one with the plug burnt GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
PAUL T Posted December 13, 2017 Author Report Share Posted December 13, 2017 It is not even firing now. My wife says she hears the pump kick on. I will have to see if I can find my fuel pressure guage. I also need to check and possibly clean the Throttle body out. Same codes. Link to comment Share on other sites More sharing options...
PAUL T Posted December 27, 2017 Author Report Share Posted December 27, 2017 Changed the spark plugs and broke a few coil plugs on rear harness. Bought a new wiring harness from dealer and paid $128 for what I was told was 2 harnesses, only got one and the plugs wouldn't fit the existing coils and they wouldn't take it back. So I bought the Delphi rear coil module which consists of 4 new coils and new harness for $114 from Rockauto. Gonna try to put it on in 20 degree weather tonight. I still need to drain the gas tank and refill with known good gas but the weather here is not helping. Can't get it started now to check for vacuum leak. Could it be crank sensors? Link to comment Share on other sites More sharing options...
PAUL T Posted January 10, 2018 Author Report Share Posted January 10, 2018 Is there a code for a bad starter? While cranking the starter it will hit but not start, then it rakes like cranking the starter with the engine running. I replaced spark plugs on the front and back and coils on the back. The starter has been acting up for a couple of months. Link to comment Share on other sites More sharing options...
rockfangd Posted January 11, 2018 Report Share Posted January 11, 2018 there is no code for a bad starter. sounds like it has a bad bendix. It is spinning but not popping out by the sounds of it GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
PAUL T Posted January 11, 2018 Author Report Share Posted January 11, 2018 I reread the codes and noticed a P0120 code which is a TPS code. So I ordered the TPS Sensor and installed it and that took care of the hard starting. The car started and ran like a champ and the SES light disappeared. No codes for now. Thanks to Logan and rockfangd that posted, I couldn’t have found the problem without you all. Link to comment Share on other sites More sharing options...
barczy01 Posted January 11, 2018 Report Share Posted January 11, 2018 check the ground cable on the rf inner fender near fuse block that attached to alternator. Link to comment Share on other sites More sharing options...
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