Question about 1989 Cadillac Fleetwood

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Emissions sticker under hood is missing for vacuum hose routing and some hoses are hooked up wrong. Need diagram to explain/show what hose goes to what part in engine bay and to correct vacuum port(s) on carburetor. Also, if I may add, it's a Rochester Quadrajet on a 1989 Cadillac Brougham with a 307 Oldsmobile engine. Idle mixture screws need to be adjusted and any feedback with proper adjusting procedure(s) would be appreciated. Thank You for your valuable time with this matter

Posted by nofearamk on

  • nofearamk Aug 07, 2011

    Thank you bro for the quick response to my inquiry! Will check out the sites.

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2 Answers

john nail

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If this car has a 307 with a carb it did not come out with it the 1989 fleetwood came out with a 4.5L cadilliac V8 with DFI fuel system, so i have no idea whet to tell you on the vacuum lines.

the last year cadilliac used the 5.0L (307) was in 1986, and they used 2 fuel systems so you need to know your vin# the 8th vin# will be either a Y or a 9

vin# Y


Emissions sticker under hood is - johnjnail_213.jpg
vin# 9


johnjnail_214.jpg
now for adjusting the carb. if it has never been adjusted before you will need to remove the carb and turn it over and remove the factory plugs over the adjusment screws then reinstall the carb and using a double D adjustment tool turn the screws out 2 turns then start turning the screws in one at a time untill the rpm drops then back back out just untill the rpm leves back out then 1/4 more this is called a lean drop carb adjustment also this carb has a mixture control unit inside the carb and it can also be adjusted but you need a dwell meter adjust the mixture control unit to 30 degress dwell on the V8 scell.

Posted on Aug 07, 2011

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ZJ Limited

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I thing that everything that you need are in this sites:
- qudrajet_carburetor_rebuild/dyno_test_results
- firstgenfirebird.org/FAQ/engine/carburetor

Additionally, I suggest check this write-up about how to rebuild/ modify quadrajets (also vac hose diagram)

Hope helps.

Posted on Aug 07, 2011

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