Mechanics

TOYOTA TERCEL SENSOR PROBLEM

1991 Toyota Tercel

Hello,

I am trying to help a neighbor (elderly) out.
She has a 1991 Toyota Tercel LE with 74,500 with a 1.4 liter engine.
It won't pass marta emissions.
Her tags have expired, so I just can't jump in it and run it to a mechanic.

The car starts fine, it idles fine, put it into gear and it idles rough, but does not die.
The car had new plugs put in it 19 months ago (4000 miles ago) and a new air filter, it looks fine. Oil was changed at that time as well. I found this out by looking thru all her paperwork.

I checked the oil, and it has a " gas" smell to it. I took off the oil fill cap as well and it has a " gas" smell too. The oil looked fine and clean!

Car does not smoke on start-up or while it is running.
BUT, I noticed the tail-pipe has a large amount of Black-sooty stuff on the inside of tail-pipe, I mean thick!

So before I start replacing one item at a time, do you guys have a idea of where to start.

I am not that mechanically inclined, and thought she may need a new air-filter or new plugs, but they both looked almost like new.

I know you probably won't be able to help me because I don't have the " codes" or anything.

But any help beats no help.

Regards,
Jack
Avatar
Jackonzophi
October 8, 2007.




Could be a sticky/bad injector. If it is that rich, pull plugs and see if one is darker than the others. Could also use a meter and measure resistance across the injectors and look for the difference. If all are rich, might need an o2 sensor
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Tiny
Jack42
Oct 9, 2007.
O2 sensor is what I thought, as soon as I saw the soot build-up in tailpipe.

Betty (the owner) told me, she had the oil changed and air filter done regularly, but, she couldn't ever remember having anything else done to it, other than replacing the tires once, and brakes once.

All city driving for 16 years.

Thank you very much for your input.

Tiny
Jackonzophi
Oct 9, 2007.

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