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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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)...
  9. 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...
  10. 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...
  11. Canada
    Alright, so I know that this is a rough car to work on. I am aware the parts are scarce and hard to come by. Currently I am looking for a fuel filler neck. The hose is fine. Engine has had pistons cleaned, Mechanic managed to repair it. Great car! Rough on price to fix up but it was...
  12. FWD DeVille 1985-2005, Fleetwood, and 60 Special
    2003 DeVille with 80k miles has been driving absolutely fine, smooth and powerful, when tonight I am cruising slowly around my neighborhood looking for parking and the car suddenly starts shaking. I hoped it was the road surface but soon convinced myself otherwise -- it shook when stopped, a...
  13. Northstar Engines and System Technical Discussion
    Right now I am ripping my Seville STS 2003 apart in trying to find a elusive misfire but upon putting it back together hopefully issue solved, I’m gonna be deleting the cat and installing a 3” pipe back to some muffler brand not sure yet. I’m gonna do my best to follow the stock exhaust path...
  14. Northstar Engines and System Technical Discussion
    Hi there, i am wondering if anyone has any experience using this method to fix the head bolt issue on a Northstar motor : https://thermalweld.com/auto-repair-cadillac-northstar/ They promise a fix. But no real customer reviews on the net.. Thanks
  15. Northstar Engines and System Technical Discussion
    Hey everyone im new here. I have a 96 deville with a northstar im looking to put in a project car. What kind of wiring harness are people using? Are they re-using oem harnesses or is there a good plug and play type stand alone harness out there? I have all the oem wiring. I appreciate any help...
  16. Seville and Eldorado Forum
    I have a 1993 eldorado touring coupe with the 4.6 northstar. I was given this car recently it runs like a beast other than needing the brakes bled. The guy I got it from said he put new lines on but didn't bleed the brakes. The rear passenger side brake is seized or stuck to where I can't move...
  17. Northstar Engines and System Technical Discussion
    As a result of driving on LPG, I experienced compression leakage during cold run on cyl. #1. Both the inlet valves leaked as a result of burnt valves/seats due to lean mixture burning in cyl.#1 causing a higher combustion temperature. The lean mixture was a result of bleed air being mixed at the...
  18. STS Forum - 2005-2012
    My wife has a 2005 STS with the Northstar V8. The car started losing a lot of oil, I had a good diagnostic mechanic check it out. Here's what I have: Both valve cover gaskets are leaking small leak at the oil filter adapter PCV valve hose needs to be replaced variable valve timer solenoid needs...
  19. Northstar Engines and System Technical Discussion
    Hi all! Bought my 2000 eldorado a year ago. I know the radiator had been replaced just before. It’s also been in an accident and repaired because it’s for a bent subframe. So it’s not close to perfect. But it was cheap and better than what I had. Plus- tushy toasters. Anyway, I’ve got a coolant...
  20. Northstar Engines and System Technical Discussion
    Howdy Cadillac gang, I have own a 1988 Eldorado with a 4.5 litre v8. The body is in great shape, but the engine is a bit tired, and I wanted to put something a bit more peppy in it. I was looking long and hard at the 200hp 4.9 and 4.5 High Technology engines from the era, but I saw that...
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