gross polluter in california

unaware · 02-21-2004, 08:08 PM

Help!

I am a moron!

My 1989 convertible that I rarely drive needed a smog check (test only station) so I dropped it off. Apparently when then the engine warmed up it flagged a code, but the tech ran it anyway L. I am now a gross polluter.

Hydrocarbons at 258ppm
Carbon monoxide 6.21%

Computer had: Code 13 - o2 sensor
Code 42 - spark timing

Replaced distributor module and o2 sensor
Cleared codes

But the computer still blows a code 13

Checked computer it shows .445 volts constant
Check at sensor volt varied around .6 volts
Checked at back of computer (purple wire) same as at sensor

Is it reasonable to think I need a new chip and/or unit?

Thanks

Cooter · 02-21-2004, 09:09 PM

When my '86 showed the O2 sensor code and replacing the sensor did not fix it, I traced the wiring down and could not find anything wrong so I swapped in another ecm and the problem was solved.

unaware · 02-21-2004, 11:04 PM

Thanks cooter I just swapped it out and it worked!

On the ecm it said to be sure and check all solenoids and relays. Do you know what they are talking about?

Cooter · 02-22-2004, 01:10 AM

More than likely, if you replaced the ecm and everything is working, then you should not have too much to worry about. I don't have my service manual in front of me, but there are several relays and a solenoid or two controlled by the ecm. They are concerned that a failed relay caused the original ecm to die but since your's was the input for the O2 sensor, I would probably leave well enough alone. Drive it around and make sure you are getting o2 sensor activity and have it re-smogged.

Vett-eight-nine · 02-23-2004, 12:43 AM

How much is an ecm??? May be going down that road! :U

drive it · 02-23-2004, 01:57 AM

Always ask for a "pre-test"! If you were closer, I'd say bring it by...I have an anylyzer with gas bench...oh well, a little too much snow on the ground now too...

Vett-eight-nine · 02-23-2004, 06:17 PM

Pre-tests are not an option here (not free, anyway!)

unaware · 02-23-2004, 08:40 PM

autozone about 80 bucks for new ecm.

they charge 140 buck core charge, so remove ecm first (take out chip and cover, remove the two plastic mounting rods)

ALWAYS DISCONNECT THE NEG BATTERY CABLE FIRST!!!!

Cozmo · 02-24-2004, 12:18 AM

Quote:

More than likely, if you replaced the ecm and everything is working, then you should not have too much to worry about. I don't have my service manual in front of me, but there are several relays and a solenoid or two controlled by the ecm. They are concerned that a failed relay caused the original ecm to die but since your's was the input for the O2 sensor, I would probably leave well enough alone. Drive it around and make sure you are getting o2 sensor activity and have it re-smogged.

Cooter,
I am imressed with your knowledge.

Thanks for the info! :cheers: