mluczaj22 Posted July 10, 2012 Share Posted July 10, 2012 anyone had these two codes pop up together consistantly on a cali emissions pathy? im having trouble tracking down the problem after these parts have been replaced. the codes just keep coming back. Link to comment Share on other sites More sharing options...
Slartibartfast Posted July 10, 2012 Share Posted July 10, 2012 Ignition signal and EGR? If new sensors don't solve the problem, either there's a problem with the harness or something's wrong with what the sensors monitor. I'd check the plugs first, make sure they're not corroded Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 10, 2012 Author Share Posted July 10, 2012 yeah its driving me nuts. ive done all checks per fsm and everything checks out good. after a day they both come back. Link to comment Share on other sites More sharing options...
Tungsten Posted July 12, 2012 Share Posted July 12, 2012 That looks like a fun one. Can you list what you already did exactly? Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 12, 2012 Author Share Posted July 12, 2012 new coil,resistor,egr valve and hoses. also egr solenoid. im thinking i have more crud in the egr line and intake. it was very gummed up. Link to comment Share on other sites More sharing options...
silverton Posted July 12, 2012 Share Posted July 12, 2012 code 21 could also be caused by distributor cap, rotor, spark plug wires, and the spark plugs. 1 Link to comment Share on other sites More sharing options...
Tungsten Posted July 12, 2012 Share Posted July 12, 2012 Most likely just a crack in the cap or a glazed rotor. Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 17, 2012 Author Share Posted July 17, 2012 its fixed. the egr port was clogged where it meets with the mixture heater plate. not much room in there at all. bad design. ignition code has vanished too. strange. Link to comment Share on other sites More sharing options...
Kingman Posted July 17, 2012 Share Posted July 17, 2012 Those are almost always clogged. Link to comment Share on other sites More sharing options...
mluczaj22 Posted July 17, 2012 Author Share Posted July 17, 2012 never had this issue with my 87 hb. but i also maintained it alot. i used the egr valve from my hb and it was nice and clean. i just wasnt sure how common it was. Link to comment Share on other sites More sharing options...
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