cams415 Posted March 18, 2015 Share Posted March 18, 2015 Need advice my 280z is running to rich what should i do Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted March 18, 2015 Share Posted March 18, 2015 Replace the air filter. Quote Link to comment Share on other sites More sharing options...
cams415 Posted March 18, 2015 Author Share Posted March 18, 2015 That should do it? Someone told to replace the water temp sensor when i went to get it smogged it mostly passed expect for emissions that failed and timing Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted March 18, 2015 Share Posted March 18, 2015 I have no idea since you have not given any information. But when I drove my Z from Colorado to California, my mileage dropped to less than 20mpg and it ran rich, so I replaced the filter and that fixed it. If you want useful help with your issue you need to give details on your car. Engine, fuel injection, modifications, history. Even if it's completely unmodified, you need to say what the issues are, when they started, what you have done... Quote Link to comment Share on other sites More sharing options...
Phantom Posted March 21, 2015 Share Posted March 21, 2015 Follow the electrical leads from the water temperature sensor where it's installed in the thermostat housing. About 18" down the lead and into the larger part of the harness you should see/feel a "small lump" in the harness. Strip away th insulation and you'll find the aluminum bullet connectors where the wires from the engine temperature sensor connect into the harness. Those aluminum connectors corrode over the years causing higher resistance in the circuit which tells the ECU the engine is cold and to run richer. Pull the connectors apart, thoroughly clean them, coat them in dielectric grease and reassemble. That will eliminate that as a source of the engine running rich. My '77 was running so rich my plugs were wet with fuel and I was getting 5.5 MPG when I finally discovered the "lump". Quote Link to comment Share on other sites More sharing options...
Tony D Posted March 22, 2015 Share Posted March 22, 2015 (edited) "it mostly passed expect for emissions that failed and timing" Smog.. In before the shed...LOL Edited March 22, 2015 by Tony D Quote Link to comment Share on other sites More sharing options...
JSM Posted March 26, 2015 Share Posted March 26, 2015 "it mostly passed expect for emissions that failed and timing" Smog.. In before the shed...LOL I wonder who coined that phrase, "in before the shed!" Quote Link to comment Share on other sites More sharing options...
Pharaohabq Posted March 27, 2015 Share Posted March 27, 2015 Your cold start injector could be leaking too, to cause a rich condition. There's a few possibilities. Can you describe how it's running? is there any surging? you said it flagged on timing, That could certainly cause rich running. get a light and time it according to the FSM. I think it was something like 10 deg BTDC, but you would need to look it up. Quote Link to comment Share on other sites More sharing options...
Phantom Posted March 29, 2015 Share Posted March 29, 2015 (edited) All good advice above. 10 BTDC is correct for timing on the 77 L28. Any update on the status? Edited March 29, 2015 by Phantom Quote Link to comment Share on other sites More sharing options...
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