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Discussion Starter #1
My 89 NA is throwing a code 25 & 26 which is rich and lean condition. I have no idea where to start looking. Any tips are appreciated. The car idles at approximately 1K rpms which seems a bit high for me. I have a FSM coming to me in the mail but wanted to get a head start on the problem if I could.

-Charlie
 

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Shadetree mechanic
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2,499 Posts
CEL code # 25
Air-fuel ratio lean malfunction

Trouble areas
-- Injector circuit
-- Injector
-- Oxygen sensor circuit
-- Oxygen sensor
-- ECU
-- Air leak
-- Fuel pressure line
-- Air flow meter

CEL code # 26
Air-fuel ration rich malfunction

Trouble areas
-- Injector circuit
-- Injector
-- Oxygen sensor circuit
-- Oxygen sensor
-- Fuel pressure line
-- Air flow meter
-- ECU

Troubleshooting the EFI electronic circuit with a volt/ohmmeter
http://www.pbase.com/aw11mr2/image/55009037
 
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