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  1. Intake gasket replacement help?

    Cadillac Seville / Cadillac 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)...
  2. '98 Deville - usual Northstar problems?

    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...
  3. 2004 Deville overheating mystery

    Cadillac DeVille 1985 to 2005 including:1985-1992
    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...
  4. 98 ETC fuel filler neck

    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...
  5. Another random misfire thread

    Cadillac DeVille 1985 to 2005 including:1985-1992
    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...
  6. Performance upgrade for northstars (DIY attempt)

    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...
  7. Thermaweld Northstar Kit

    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 : They promise a fix. But no real customer reviews on the net.. Thanks
  8. 96 northstar wiring harness

    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...
  9. Seized brake? 93 Eldorado touring coupe

    Cadillac Seville / Cadillac 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...
  10. New cylinder heads after 90k miles and failing timing chain tensioners

    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...
  11. 2005 STS Oil and Air Leaks GALORE

    Cadillac STS Forum 2005 through 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...
  12. 2000 Eldorado surge tank hose coolant leak

    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...
  13. Need some help with Northstar swap project.

    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...
  14. 1994 Seville Engine Swap ... 4.6L

    Cadillac Seville / Cadillac Eldorado Forum
    Hi i got a 93 Seville with a 4.9 gm as a donor car , a 90 VW Jetta Diesel donor car and I have a 94 Seville sts with a 4.6L . the 94 is in immaculate shape besides the fact it has a cracked block . I am having issues trying to find a replacement block or engine so i have a couple options. the...
  15. 2002 Deville base overheats can't figure out what's wrong

    Cadillac DeVille 1985 to 2005 including:1985-1992
    Ive got a 2002 cadillac deville base im gonna try to give as much detail as possible here. First of all car only gas 106000 miles... been driving it for about 6 months with absolutely no problems furthest i would go was about 60 miles and nothing would go wrong the car ran like a champ then...
  16. STS-V - Finally got one !!!

    Cadillac STS-V Series Forum
    What an amazing Cadillac!! The car being a 2007 with an estimated 80k price tag new, far from my reaches back then but as time will have it, some things are worth the wait! V8s Forever
  17. Greetings from Finland!

    Informal Lounge, Introductions, General Discussion
    Hi everyone. Just wanted to introduce myself. I bought a 1992 Seville STS a couple of weeks ago and just registered to this forum. From the looks of it there's plenty of advice available should I need it. The car is in very good condition for it's age. Completely rust free, for example. It's...
  18. Antifreeze Reserve tank boiling over

    Cadillac Seville / Cadillac Eldorado Forum
    I have a 92 STS with the 4.9 V8, and when I'm idleing at a stop light or drive thru it starts over heating. as long as I'm moving it's fine. Temp got up to 190 degrees and I started seeing steam appear around the hood. I pulled over and opened the hood and that plastic antifreeze overflow tank...
  19. 2000 Deville Fix It Before It Fails?

    Cadillac DeVille 1985 to 2005 including:1985-1992
    Hello All, I have been pouring over topics here for weeks now. I am about to "inherit" a 2000 base Deville from my wife's God Mother. She had owned it since new but it has not been garaged (in a parking lot of a retirement center). It has appx 42,000 miles and is in very good...
  20. Deville Concours ---> DTS......Differences?

    Cadillac DeVille 1985 to 2005 including:1985-1992
    What are the major differences between the 1997-99 DeVille Concours and 00-05 Deville DTS? I know it's a whole new body and platform, but it's the same underlying principle below....the full size DeVille with all the sporty accoutrements. Does the DTS drive a lot tighter than the Concours? Does...