January 18, 201213 yr Author comment_377939 replaced coil and it started up again but its running kind rough. Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-377939 Share on other sites More sharing options...
January 18, 201213 yr comment_377940 But it's running Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-377940 Share on other sites More sharing options...
January 18, 201213 yr comment_378009 Is it a steady, "chug, chug, chug" sort of rough, that would suggest a cylinder or two that consistently isn't firing? Or do you have a random, irregular miss?Try richening the mixture by pulling the vacuum hose off of the fuel pressure regulator. Block the hose to seal the vacuum leak. Better or worse?Try leaning the mixture by pulling off the vacuum hose to the HVAC system (next to the brake booster vacuum hose). Better or worse? Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378009 Share on other sites More sharing options...
January 18, 201213 yr Author comment_378041 up one down another it started (good) now it just idles low then when its reved up it sputters then dies. any advice? Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378041 Share on other sites More sharing options...
January 18, 201213 yr comment_378045 Did you try what Sarah said to do? It would be good to check your fuel pressure with a gauge, too. Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378045 Share on other sites More sharing options...
January 18, 201213 yr comment_378046 If your plugs are black then it is possible the connections to the water temp sensor need attention. Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378046 Share on other sites More sharing options...
January 18, 201213 yr Author comment_378047 i was going to but it refuses to start again. and ill take a look blue thanks Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378047 Share on other sites More sharing options...
January 18, 201213 yr Author comment_378049 i checked the sensor and fiddle with the wires a bit and lo and behold it started up again. i think i might have a problem there Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378049 Share on other sites More sharing options...
January 18, 201213 yr Author comment_378051 if there is something wrong with that sensor. aka bad connection/ wire it would cause it not to start right? Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378051 Share on other sites More sharing options...
January 19, 201213 yr comment_378076 If you have a bad connection, the car might start, but it will run really rich, with black smoke out the exhaust. If the sensor is shorted, the engine will run very lean. I don't know whether it would start that way. The best way to check your sensor and connections together is at the ECU plug. As I recall, you need to check resistance between pin 13 and ground.Try starting the engine with the fuel/air mixture modifications I suggested, and see if either one gets the engine running any better. Of course this is just for diagnostic purposes. Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378076 Share on other sites More sharing options...
January 22, 201213 yr Author comment_378377 Big update! thanks for all your help guys i did alot of wire checking and everything you guys told me but all it took was an extra pair of eyes. My dad came over today and we spent a few hours on it and found that the wires going to the pick up coil in the distributor were melted! so we took the wires off the distributor, cut off the melted portion and rewired them and it runs fine now! thanks again for all your help FastWoman, SteveJ, blue, jimbob_racing, and grantf! Link to comment https://www.classiczcars.com/forums/topic/41889-car-turns-over-but-wont-start-78-280z-please-help/?&page=2#findComment-378377 Share on other sites More sharing options...
Create an account or sign in to comment