'94 DSM running rich...

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- Teryaki
  
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posted
20 years ago

Thu, Mar 4, 2004 4:13 AM

I've got a '94 twin-cam normally aspirated Eclipse. Picked it up two months ago. It runs great, but can't pass emissions. I'm completely stuck at this point.

Emmissions were 3x the allowable on all categories. There's black smoke that smells of unburned fuel under acceleration, both when cold and when hot. Oil change, new air filter, replaced the O2 sensor, welded up a crack in the exhaust manifold, and ran a bottle of injector cleaner through it. WORSE on the re-test. Cleaned the plugs, checked conductivity on the plug wires, did compression tests on all four cylinders... Nothing wrong in any of the tests, but still no change. The car runs very strong with a little bit of a low-RPM miss, gets really good mileage... I'm stuck scratching my head.

Any ideas? Anybody?

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- Dick C
  
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posted
20 years ago

Thu, Mar 4, 2004 4:58 PM

Teryaki wrote in rec.autos.tech

Don't clean plugs, replace them. They are cheap, very cheap, and cleaning rarely gets them back to where they need to be. Also replace the plug wires. Also replace the fuel filter, pcv valve, distributor cap and rotor. In other words, do a complete tune-up, don't poke at it. Also check for vacuum leaks.

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