1989 Honda Accord Emmissions Problems

1989 HONDA ACCORD
226,451 MILES • 4 CYL • FWD • AUTOMATIC
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KENMAXINE2007
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  • 8 POSTS
Have attempted to pass the local emmissions test and each time have failed. I continue to recieve a high CO and HO?. I have had the Catalytic converter replaced, replaced the Rotor and Plug's, and ran a injector cleaner through the fuel system as well as ran the tank near emty with the fuel additive. The check engine light is on but as near as i can tell the blinking LED under the drivers seat is illuminating 6 times indicating a coolant tempature sensor.

The car does have a good Idle, however, it does at time seem to miss occasionally and I need to set the idle to 700 as it was high when I had it in the test center last.

Can you advise me please as to what other direction to take.


Thanks
Ken
Jan 26, 2009 at 9:39 AM
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MASTERTECHTIM
  • ✓Experienced Mechanic
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i would first staqrt by replacing coolant temp sensor. if its reading cold all the time then the computer will make it run rich to compensate for it having low engine temp
Jan 26, 2009 at 11:27 AM
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KENMAXINE2007
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  • 8 POSTS
Thanks for the Information. I replace the coolant sensor as you indicated, and the check engine light has gone out as suspected. I have yet to take it back for a retest.

I was going to check the timing, am I reading the tech manual correct in that it indicates to set the timing while in Park? Also what I noticed, is that when Idleing it has a slight miss every so often, but what is odd is, when I apply the brake while in Idle and in Park, I get a high vibration and when I am in drive with the brake on I get the same. Any thoughts on this.

Thanks,
Ken
Jan 27, 2009 at 10:15 AM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
the vibration is usually caused by a worn engine mount but its most often noticed with brake on in drive not park. change your engine oil before your retest. gas soaked oil will fail a emissions test every time
Jan 28, 2009 at 9:41 PM
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