[potat]

Hi All,
A quick update, I got the SUN MGA 1400 tubing diagram and the analyzer is working fine.

Hooked up my car to the analyzer and looked at the exhaust numbers, it was a little rich and my
mechanic checked most of the things, and it seemed to be okay. Now he plans to test the emission
components one by one and see where the problem is. Will keep you posted. We had a spare MAP
sensor, and looks like MAP is not the problem. Thermostat is also working fine. I have pulled parts
from an old car the last weekend, hopefully that helps us to trouble shoot the problem.

Thank you!

[potat]

Good one, Twiggy. If you could get the code, post it as well so it becomes very useful!!

[potat]

Thanks, Eric.

I agree with you. I need to get this problem taken care of.
Will update as soon as I am making any progress.

Thanks!

[potat]

Thank you all for your valuable comments.

My spark plugs, wires, rotor caps and oxygen sensor were replaced about 3 years ago.
I understand the ‘changed parts’ do not mean anything as these components can go
bad any time. MAP sensor was changed ~4 years ago.

No check engine light or codes.

My engine burns little oil as I have to top the engine oil atleast once with 1/2 quart between
the oil changes (3000 miles).

As per my mechanic, the vehicle is smooth and he has not detected any leaks. (On another
note, my mechanic’s gas analyzer is down. His SUN MGA 1400 gas analyzer internal tubing
has gone bad, still waiting for the vacuum tubing diagram for it).

My car just failed the emissions test – 160 ppm HC and 2.0% CO. This was with a 1400-1450 idle
speed that was set by my mechanic.

Let me try to follow the steps as per your listing. For the fuel injector cleaning, I will ask my
mechanic.

I will keep you posted. Thanks a lot. In the meantime if anyone has any additional comments,
please post. Thanks and have a great week!

[potat]

Thanks, Eric.

Yes Eric, you are correct. The recommended idle for Corolla 95 (automatic) is 700-750 rpm.
My mechanic has set the idle speed to 1400 rpm (he has done this in the past to get
through the emissions test), and according to him ~1400 rpm would give a lean mixture
(I have a hard time understanding this, so I took his word).

I will check again for vacuum leaks and see whether I find any indications.

Thanks for many wonderful videos on youtube. When I first started getting my
hands ‘Dirty’, (2004) there were not many videos on car repairs.

By the way, do you know someone who owns a SUN MGA 1400 modular analyzer
(now the company is taken over by SNAPON)? I am trying to get the vacuum tubing
diagram for the analyzer so that it is easy to check the emissions at my mechanic’s
place. (I got a manual for MEA 1400, but that’s not the one I am looking for).

Thanks!

[Author]

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