How to Pass Vehicle state Inspection Honda Civic 92 Check engine light high idle rpm?

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JohnThomas

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HELP, my civic won't pass inspection!
Engine putting out too much pollution!
Any relatively cheap solution to fix this problem? (other than buying another used car)
Engine flush? << any use for doing this?

Take it to the junk yard and get a new one? < no, no dinero!
especially in this economy.

Already tried:
Replacing spark plugs, air filters, oil filters
Using : "guaranteed to pass" and other fuel additives.

To make matter worse
Check engine light is on, took it to a mechanic he doesnt understand why. Didn't you a computer to read error code, didn't want to take it to an expensive mechanicfor this old car.
Symptoms:
High idle rpm: Used to be around 500rpm now 1000rpm
Temperature gauge is unusually slow and sluggish.
Yes there is adequate coolant. and car runs fine.
 
If you want it fixed the best bet is to take it to a mechanic with a code reader. It could be one in a lot of codes and it could be the culprit of all your problems.
 
Ugh on a car that OLD a check engine light wont cause you to fail the test. That is the older version obd1. Might the light shed some light why you failed, maybe yes maybe no. Next time you ask a question, you might want to use some common sense and maybe post the readings vs the acceptable specs. Did you fail Nox, Ho, Co?. How long was the duration until you failed. This is very important info you left out.
 
Ugh on a car that OLD a check engine light wont cause you to fail the test. That is the older version obd1. Might the light shed some light why you failed, maybe yes maybe no. Next time you ask a question, you might want to use some common sense and maybe post the readings vs the acceptable specs. Did you fail Nox, Ho, Co?. How long was the duration until you failed. This is very important info you left out.
 
You have a vacuum leak on the engine.
A small hose has come disconnected somewhere and is sucking air into the engine.

Look around for a small hose just dangling, or a vacuum port on the carburetor with nothing hooked to it.
 
You have a vacuum leak on the engine.
A small hose has come disconnected somewhere and is sucking air into the engine.

Look around for a small hose just dangling, or a vacuum port on the carburetor with nothing hooked to it.
 
You have a vacuum leak on the engine.
A small hose has come disconnected somewhere and is sucking air into the engine.

Look around for a small hose just dangling, or a vacuum port on the carburetor with nothing hooked to it.
 
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