airmike Posted November 9, 2010 Report Share Posted November 9, 2010 I am looking for advice on an engine swap: I have found a north star engine from a 2001 seville, rebuilt less than 1000 miles ago and then wrecked. The guy says he will get me all the papers showing what was done. The local salvage yard says it does not interchange with my 1999. Anyone know what is different, what would need changed, and if indeed it would be a reasonable challenge to attempt. It can be had for $600 dollars and seems to me it would be worth the effort. Anyone that could help me with facts would be greatly appreciated. I would hate to jump into this only to find out its not practical. Thanks to all in advance Mike Link to comment Share on other sites More sharing options...
rockfangd Posted November 9, 2010 Report Share Posted November 9, 2010 600 is a total steal, I wish I could find an engine for my 97 for that price. I dont quite know the interchange years but I do believe, 93-95 96-97 98-99 2000-2002, someone correct me if I am wrong on this, and I am not sure about the 9 or Y being an issue with the transmission GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
KHE Posted November 9, 2010 Report Share Posted November 9, 2010 The 2000+ engines will NOT interchange with the earlier engines. The way the PCM reads the crankshaft position is totally different. Why not repair the existing engine? Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 9, 2010 Report Share Posted November 9, 2010 The VIN 9 and VIN Y engines have different intake cams and different final drive ratios. The intake cams can be changed and the differential can be swapped out the right side of the transmission but it's probably easier and cheaper to get the right engine. Rockfanged has the years right, except that it's 93-94 and 95-97. The difference between the 1993-1994 and later Northstars is pretty difficult to deal with; the heads and fuel injection changed and the EGR changed completely. The 1995 model year used OBD I 1/2 and later Northstars use OBD II so the sensors are different, and I would use the fuel injection off the car, not off the motor, if I put it in a 1996-1997 car. I think the main differences between the 1995-1997 and the 1998-1999 are accessory mounts and possibly a motor mount. The 2000 Northstar was pretty much a redesign. It would probably be cheaper to buy a running 2001 Seville than to put a 2001 Northstar in a 1999 Seville. -- 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...
BodybyFisher Posted November 9, 2010 Report Share Posted November 9, 2010 Not a serious issue, but pre-96 NSs used green coolant and I would avoid them. That is not to say that GREEN couldn't have been used on a 96+ motor, its just that its easier to miss the change interval that is 2 years, vs. a change interval that is 5 years. Although once green us used on a 96+ motor, the 2 year interval must be adheared to. I would say, that not knowing the maintenance history of a NS, unless the block is boiled out/hot tanked, us the 2 year coolant change interval. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
airmike Posted November 10, 2010 Author Report Share Posted November 10, 2010 The 2000+ engines will NOT interchange with the earlier engines. The way the PCM reads the crankshaft position is totally different. Why not repair the existing engine? Well the biggest reason would be the price of an already (completely) rebuilt engine for $600 vs a repair. I guess from your reply this is a no go. I am NOOOOT looking forward to this job. oh well on to more procrastination Thank for the info-even if it wasn't what I wanted to hear. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 11, 2010 Report Share Posted November 11, 2010 That is a shame, its cheap enough to buy and store in your garage till you get a body for it in a few years Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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