1990 Cadillac Seville POOR GAS MILEAGE

8008MAN

MEMBER
1990 CADILLAC SEVILLE
V8
FWD
AUTOMATIC
78,000 MILES

ALL OF A SUDDEN MY CAR SMELLS OF GAS AND IS GETTING HORRIBLE MILEAGE. I'VE CHECKED FOR LEAKS AND FOUND NONE. I RECENTLY HAD A TUNE-UP DONE A COUPLE OF INJECTORS REPLACED AND A NEW DISTRIBUTOR INSTALLED. I'M GETTING ABOUT 10 MPG AND IT USED TO BE ABOUT 18 MPG. ANY HELP WOULD BE APPRECIATED.

3 Replies

BUZZSAW

MECHANIC
1,198 POSTS

Is it missing? Or running bad? Scan the codes for me, off and warmer on the heater/AC control head. Codes will come up in the control head, write them down

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Monday, February 4th, 2008 AT 6:43 PM

8008MAN

MEMBER
3 POSTS

Is it missing? Or running bad? Scan the codes for me, off and warmer on the heater/AC control head. Codes will come up in the control head, write them down[/quote:000ec0afc0]

It is not missing and it seems to run ok? It just has NO power and it is sucking down the gas. Also just yesterday it started doing another wierd thing. When you go to start it, it chimes, like a door chime. It never used to do that. Anyway here are the codes. NO ECM CODES, B112 Current, all the rest of these are History Codes B120, B122, B333, B334, B335, B336, B337 & B552. Can you tell me how to clear these history codes.

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Tuesday, February 5th, 2008 AT 4:17 PM

8008MAN

MEMBER
3 POSTS

Is it missing? Or running bad? Scan the codes for me, off and warmer on the heater/AC control head. Codes will come up in the control head, write them down[/quote:9aee99968f]

It is not missing and it seems to run ok? It just has NO power and it is sucking down the gas. Also just yesterday it started doing another wierd thing. When you go to start it, it chimes, like a door chime. It never used to do that. Anyway here are the codes. NO ECM CODES, B112 Current, all the rest of these are History Codes B120, B122, B333, B334, B335, B336, B337 & B552. Can you tell me how to clear these history codes.[/Quote:9aee99968f]
I went out and cleared the codes and the only one that comes back is B112.

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Wednesday, February 6th, 2008 AT 2:42 PM