1991 Toyota Corolla Fuel problem - Black smoke & stalli

TERESA KINTZ

MEMBER
1991 TOYOTA COROLLA
4 CYL
2WD
MANUAL
23,876 MILES

Car began by stalling when slowing down for stop signs or lights. Would start again, but acted like it was not getting enough fuel, so husband increased idle speed. Still had problem, so put on Code meter which read a "Code 31". Replaced MAPS sensor, cleaned air filter, cleaned and regapped plugs and turned idle back down. Black smoke out exhaust has worsened, fuel smell is strong and car ate 5 gallons of gas in 80 miles! Any ideas for my husband to check now? He is a carburetor man and these computer problems have him baffled.

Tuesday, July 1st, 2008 AT 9:59 AM

2 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi Teresa Kintz,

Is the code still showing?
Is MAP replaced same rating? Part new or used?
Check MAP wire for open circuit and vacumn leakage.

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Tuesday, July 1st, 2008 AT 12:49 PM

MMPRINCE4000

MECHANIC
8,548 POSTS

In addition to what KHLow2008 said,

Running a car rich for an extended period of time will kill the O2 sensor and overheat the convertor, causing the convertor material to melt and clog up the exhaust.

On a 91 the convertor is bolted to the downpipe, so you can unbolt it and look inside the convertor, it should look like a honeycomb, if it is melted it must be replaced, but you must fix the rich condition first.

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Wednesday, July 2nd, 2008 AT 5:22 AM