TXCASE801 Posted April 3, 2009 Share Posted April 3, 2009 hey everybody... i need some help.... my 78z runs very rich, i have swapped out the thermotime and the temp sensor and cleaned and replaced both connectors. i have also replaced and cleaned the 2 prong sensors on the intake and cleaned and greased (dielectric grease) all the sensors on the engine and the ecm. i have checked for a vac leak, none found. i am stuck, it starts good and runs great when cold but very shortly it starts running rich.... a smaller problem is when shifting, the prm's dont drop very quickly, but the main thing it smokes bad from running so rich.....PLEASE HELP i have checked the fuel injection manual,the 78 z car manual, the chiltons and the haines manuals.... and still lost as a goose Quote Link to comment Share on other sites More sharing options...
jc052685 Posted April 3, 2009 Share Posted April 3, 2009 Cylinder Head Temp Sensor = Very importaint that its connected/works properly. What year is your car? I dont remember but I dont think all 280z had the head temp sensor. Could be wrong. Quote Link to comment Share on other sites More sharing options...
TXCASE801 Posted April 4, 2009 Author Share Posted April 4, 2009 i replaced the cts, the zone says the 78 is different from the 79. i thought the 78 up was the same and the 77 down was the same...???? well an update, the car started running like pure crap besides all the white gas rich smoke it is pouring out. just to check, did a compression check, all cyls had 125psi but #1 and #6 plugs were wet from gas. checked the plugs,(1 and 6) 1 wasnt firing and the other firing off the side near the electrode. i replaced the 2 plugs now its running good except for running rich and when shifting, the idle remains very high. i think the afm is bad but possibly the cts or the thermotime switch because when i change the plugs around there is no difference. the only change is that the engine dies when one of the plugs is pulled from the connector.. one of the harnesses has red tape on it and i do not know which one goes where. im fixing to have to ohm them out. *** note , the afm had the stop bent causing the door to partially open. i repaired the bent terminals and made a new stop. all looks ok but.... i have a 77 afm but it appears slightly different than the 78.... any suggestions??????????? thanks jj Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.