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Old 04-28-2019, 03:03 PM   #1
E10246
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Default 1988 Volvo 240 Wont pass Smog (Smog certificate attached)

I have already replaced the following on my 240 (California Smog check):

Spark plugs
Distributor cap
All filters
Oil change
Mass Air Flow Sensor
Timing belt

The smog cert says Gross Polluter, Ignition timing (FAIL), Vacuum Hoses (FAIL) and the high reading of NOx.

Its not the catalytic converter right?

But my car wont pass smog. I have attached the picture of my smog papers. Please let me know what the problem could be.

image1

Last edited by E10246; 04-28-2019 at 03:35 PM.. Reason: specifics
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Old 04-28-2019, 03:29 PM   #2
NotSoFresh
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I bet its vacuum lines.
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Old 04-28-2019, 07:05 PM   #3
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Default 1988 Volvo 240 Wont pass Smog (Smog certificate attached)

The Vacuum lines I understand, but what about the ignition timing? how do I fix that?
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Old 04-28-2019, 08:14 PM   #4
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Vacuum lines are the most basic form of engine management and is used in the ignition system to tell it if the engine is accelerating or decelerating for example. Vacuum is everything.
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Old 04-29-2019, 12:04 AM   #5
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Default RE: 1988 Volvo 240 Wont pass Smog (Smog certificate attached)

Quote:
Originally Posted by NotSoFresh View Post
Vacuum lines are the most basic form of engine management and is used in the ignition system to tell it if the engine is accelerating or decelerating for example. Vacuum is everything.
I'll tackle that first and let you and everyone first. cheap parts too!
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Old 04-29-2019, 02:16 AM   #6
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First I would check fuel pressure.

Is that car with LH 2.4 or 2.2 fuel system?

What was that ignition failure?
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Old 04-29-2019, 04:18 AM   #7
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Nox is the cat.. go to a muffler only shop to get a new one. I get mine replaced for like $250 max installed here in nor cal
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Old 04-29-2019, 04:12 PM   #8
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Quote:
Originally Posted by NotSoFresh View Post
Vacuum lines are the most basic form of engine management and is used in the ignition system to tell it if the engine is accelerating or decelerating for example. Vacuum is everything.
Is their a list/table anywhere that shows the expected vacuum levels at specific conditions?
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Old 04-29-2019, 11:26 PM   #9
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My 88 failed like that then I put a new cat on. Smog emissions numbers barely registered after the 2nd test
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Old 04-30-2019, 08:04 PM   #10
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seen this many times before on 85-88 240s with Chrysler ignition...

the diaphragm in the ignition ECU (passenger side fender area) is leaking and your ignition timing is too far advanced

plug the vacuum line elbow to the ECU with a small bb and then put it back in to the ECU and your timing will be normal and NOX will drop massively.

You need to fix whatever they said was defective.

Your O2 sensor been replaced lately? Did you warm your car up before the test and did they test it warm?
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