I have an 86 bronco.I took it in for e test and the first reading was 89 on co's and 6 on the hc.Timing was off a little so I adjusted correctly and changed the oil and plugs took it down again and it is still high.67 on co and 4.7 on hcs.any suggestions?
86 Bronco
- Thread starter braeler
- Start date
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yo; go thru this first;
Emission Failures, Smog Diagnostic Chart Source: by Recarbco Fuel Systems recarbco.com
Emission Failures, Causes & Fixes Source: by Larry C at carleysoftware.com
Is the Air Pump hooked up and running?
Have a vacuum gauge to check Vac and determine if you have a vac leak?
Have you tried a Self Test by BroncoJoe19 do the KOEO = Key On Engine Off portion first & Remember to have engine @ Normal Operating Temperature before doing the KEY ON ENGINE RUNNING (KOER) portion
assuming you have EEC IV and EFI
Vacuum Gauge Diagnosis - BEST! Source: by Craig U at classictruckshop.com
Emission Failures, Smog Diagnostic Chart Source: by Recarbco Fuel Systems recarbco.com
Emission Failures, Causes & Fixes Source: by Larry C at carleysoftware.com
Is the Air Pump hooked up and running?
Have a vacuum gauge to check Vac and determine if you have a vac leak?
Have you tried a Self Test by BroncoJoe19 do the KOEO = Key On Engine Off portion first & Remember to have engine @ Normal Operating Temperature before doing the KEY ON ENGINE RUNNING (KOER) portion
assuming you have EEC IV and EFI
Vacuum Gauge Diagnosis - BEST! Source: by Craig U at classictruckshop.com
