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  1. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    Anyone know what these are for? I just got this 97 concours for a really sweet price a few weeks ago. I've been fixing it up over the last couple of weeks, but for the life of me I cannot figure out what these lines are for. I was thinking maybe coolant lines, but they don't seen to be quite the...
  2. Seville and Eldorado Forum
    This spring when I got Calypso (yes I named my Eldorado after the paint color Dark Calypso Green) out of storage for the winter, she sounded like one of the cylinders was running dry for about the first 20 seconds every time I started her up. Recently, she let me down for the very first time. I...
  3. STS Forum - 2005-2012
    Hello everyone, A few weeks ago I parked my 2008 Cadillac STS 4.6 RWD. The issues being I lost my RPM response on my clusters and the car ran rough. I always keep a OBD2 scanner in my car so I scanned it. It turned out to be P0336 and set off two knock codes after (P0325, P0328) I reset to see...
  4. Seville and Eldorado Forum
    Hi everyone..... so I picked a 96 ETC and it is overheating.... checked the purge tube and it was partially plugged (poor flow) .... i cleared it, and now my question, it is still overheating , which direction should the flow be on the purge line. is is coming from the reservoir to the...
  5. CTS First Generation Forum - 2003-2007
    Hi all! I've got CTS 2007 2.8L LP1 Engine and it's slow... So in one day I decide to swap it some this more fun. Because of difficulties getting an LS engine in our country I choose Northstar LH2 4.6 with 5L50E trans to swap. So I already got engine and trans kit from RWD 2006 STS. Also got...
  6. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    Hello all, I’m not the best at posting (so please bare with me) but I’m really looking for some help as I’m at a loss. I have a 98 Cadillac Deville with 210800 mi. I have had intermittent stalling in the past only while in drive, and foot on brake. It was like twice since I have owned the car...
  7. Northstar Engines and System Technical Discussion
    I just finished both valve covers today 11/27/21 at 56k miles. When I was having a hard time with the passenger side I decided to do some more searching around on the forum for info and found this post here by Neutrocuted which helped me out a ton although some of his info did not apply to me...
  8. Seville and Eldorado Forum
    Hey there, I have a ‘99 eldorado esc with 125k miles on it. Engine was replaced with a remanufactured one about 5 years ago at 90k, so a pretty young engine, but for a while now, I’ve had a pretty audible ticking sound coming from the engine. The ticking is constant and speeds up a bit when I...
  9. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    I’m having some issues with my North Star. The temp being displayed on my dash does not match the scan tool. Even when the sensor is unplugged it shows my coolant is at 130* F when I checked it with my dmm it showed the correct resistance corresponding to the temp on my lazer thermometer. Have...
  10. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    I used to own a 2003 Cadillac Deville Base with the Vintage Edition package. A very close family friend bought this car brand new and then sold it to my grandma who owned it until I took ownership. I lost the car in an accident in early October and saw it sold at auction around Christmas. The...
  11. Seville and Eldorado Forum
    Okay so I bought my first car in November for my 23 bday. It’s a 97 Cadillac Seville sts northstar. It had 149000 miles when I got it now at 154000. I didn’t know a thing about cars when I bought it. I have spent hours reading the posts on here about the Seville and the northstar and have...
  12. Northstar Engines and System Technical Discussion
    My mechanic has been trying to get the system reprogrammed after replacing bot the ISC and the TPS. After several times trying, it keeps returning a code that indicates that the programming wasn't repeated. Now he wants to replace the Throttle Body, but I can only find ones on ebay. He says...
  13. STS Forum - 2005-2012
    Hi has anyone else had a problem with their lh2 Northstar pinging? It doesn't matter what gas I use, I've been running 93 octane and I still get a ping, and no check engine light at all, or codes? It just started out of the blue. Right after I had power steering pump replaced. Thank you for any...
  14. 2001 Cadillac Deville Base Modified

    2001 Cadi4.6Ld air Deville Base 4Door Sedan. 32 Valve 4.6L Northstar V8. 103,500 miles. Stock 275hp. Current Dyno before mods - Avg 268hp. Current Dyno after Mods - Avg 326hp Ram cold air intake. Hi flow cats. Duel single chamber straight through performance mufflers. Spitfire performance tuning...
  15. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    Hey. I'm new to GM cars, and I need a bit of guidance. My car began stalling when I lift my foot off the gas. The only code is P095 which states that it detected a stall (thank you very much.) Going through the diagnostics, it says to check the TPS and the ISC. The TPS seems fine. I went...
  16. Seville and Eldorado Forum
    Hi all, working on my 94 eldo base. 94 Northstar 4.6, it's idling rough, and has a random misfire, I have: Replaced the fuel pump Replaced the FPR Cleaned the TB Checked my wires Confirmed all coils are working Replaced PCV valve Done a vacuum leak check with an unlit torch (non conclusive)...
  17. Northstar Engines and System Technical Discussion
    I’ve gotten ahold of a beautiful black 98 DeVille Elegance with only 69,000 miles on it. The car drives great on the highway and most short distances, but there have been 2 times where the engine has overheated (240 degrees or over) once while stuck in traffic after being on the highway, and the...
  18. 2013 Cadillac XTS - Won’t shift to park

    I was driving home yesterday and I got home and car wouldn’t shift into Park. I can shift in neutral which I did, put parking brake on, Turned engine off but car Wouldn’t turn off. To make sure I didn’t kill battery I unplugged it. Plugged it in this morning and now car won’t turn back on. Can’t...
  19. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    This car has stumped me, so I’m turning to the collective intelligence of the interwebs. 2004 Cadillac Deville DHS 238k miles Bought at 100k miles, owned for seven years. It has a history of overheating if the outside temperature is 90+ degrees fahrenheit. Downshifting to run the engine (and...
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