1990 Cadillac Fleetwood Too much fuel consumption

SANYCH

MEMBER
1990 CADILLAC FLEETWOOD

Engine Performance problem
1990 Cadillac Fleetwood V8 Front Wheel Drive 120k miles

I bought the car a month ago and am not sure if its gas consumption is good even for a Cadillac. Now it's 20L/100 km (11-12 mpg) for the city (haven't had a chance to drive on a highway yet). Meanwhile the computer shows that the outside temperature sensor is dead (codes: F10 and F32). Can this sensor be the reason? I checked the manual, it says there's a separate temperature sensor, called Intake Air Temp sensor, proposed to control fuel waste. But who knows, may be that, outside temp one (where is it located BTW?) Can also be taken into account by the computer.

What do you think, guys?

Many thanks.

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Do you have a check engine light and when was the last tune-up?

Could be running rich due to the following:

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.

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Wednesday, June 24th, 2009 AT 3:25 AM

SANYCH

MEMBER
3 POSTS

No "check engine" yet. I put in a new air filter three weeks ago. Don't know when it was tuned up. Definitely more than a year ago, because otherwise the previous owner would have mentioned it. Is there any way I can check the coolant or O2 sensor on my own?

Thank you, rasmataz.

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Wednesday, June 24th, 2009 AT 8:46 PM

RASMATAZ