July 14, 20195 yr comment_579570 I haven't dug into technical details, but for those of you who are already looking into it... Remember that it's a 78. Might be different than what you are used to seeing. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579570 Share on other sites More sharing options...
July 14, 20195 yr Author comment_579576 19 minutes ago, Captain Obvious said: I haven't dug into technical details, but for those of you who are already looking into it... Remember that it's a 78. Might be different than what you are used to seeing. Yeah that’s what it feels like, all the diagrams don’t match up and it feels like I have different components Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579576 Share on other sites More sharing options...
July 14, 20195 yr comment_579577 Â 45 minutes ago, Captain Obvious said: I haven't dug into technical details, but for those of you who are already looking into it... Remember that it's a 78. Might be different than what you are used to seeing. oops right CO. That single lead sensor kinda looks like a switch for a cooling fan. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579577 Share on other sites More sharing options...
July 14, 20195 yr comment_579583 It's kinda looking like you might have a ZX or Maxima engine, or head, in your 78 280Z. They use a cylinder head temperature sensor in place of the water temperature sensor. It does the same thing and has the same temperature profile.  Those engines also had several extra temperature switches on the T-stat housing. Take a picture of your engine's serial number area, and the head ID area. You'll know more about what you're working with. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579583 Share on other sites More sharing options...
July 14, 20195 yr comment_579585 16 hours ago, Jack Pearcy said: . Also the clutch fork is about 4.75 inches or 120.65 mm from the front of the bell housing.  Edit - actually I can't tell what you're measuring. I measure to the bolt head. Edit 2 - it looks though, like your fork is bottomed out on the hole it sits in. Can't go any farther. This is at rest, no foot on pedal. Edited July 14, 20195 yr by Zed Head Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579585 Share on other sites More sharing options...
July 14, 20195 yr comment_579600 Zed Head is correct. Apparently  you have a transplant in your engine bay.  Here is a shot of the thermostat housing from a 79-83 ZX engine.  Looks like yours from what I can tell.  That certainly changes which parts to order. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579600 Share on other sites More sharing options...
July 14, 20195 yr Author comment_579605 3 hours ago, gwri8 said: Zed Head is correct. Apparently  you have a transplant in your engine bay.  Here is a shot of the thermostat housing from a 79-83 ZX engine.  Looks like yours from what I can tell.  That certainly changes which parts to order. Yes that’s exactly what mine looks like Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579605 Share on other sites More sharing options...
July 14, 20195 yr comment_579608 Now to figure what it connects to. Once you confirm which head and block you have, you'll need download the proper FSM for a ZX and figure out which EFI wiring harness is in your car since you have since you have a dangling connection on the sensor.  One for the 78 or 79?   I know you have a 78' but which month was it produced?  I don't have first hand knowledge of the ZX but I'm curious as when they started changing parts for the new model in the production.  Maybe someone here can answer. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579608 Share on other sites More sharing options...
July 15, 20195 yr Author comment_579633 6 hours ago, gwri8 said: Now to figure what it connects to. Once you confirm which head and block you have, you'll need download the proper FSM for a ZX and figure out which EFI wiring harness is in your car since you have since you have a dangling connection on the sensor.  One for the 78 or 79?   I know you have a 78' but which month was it produced?  I don't have first hand knowledge of the ZX but I'm curious as when they started changing parts for the new model in the production.  Maybe someone here can answer. My z was made in December of 77 Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579633 Share on other sites More sharing options...
July 15, 20195 yr Author comment_579634 I’m also still having clutch issues, I dropped the trans again and reinstalled my old pressure plate, but it still won’t disengage the clutch. From what I can tell the clutch fork is hitting the bell housing meaning it’s being fully engaged, that should have some effect on the clutch right? It acts the same trying to get it in gear with my foot on and off the clutch Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579634 Share on other sites More sharing options...
July 15, 20195 yr comment_579637 2 hours ago, Jack Pearcy said:  I dropped the trans again and reinstalled my old pressure plate, but it still won’t disengage the clutch.  From what I can tell the clutch fork is hitting the bell housing meaning it’s being fully engaged, that should have some effect on the clutch right? We've produced several threads describing the measurements you should take to be sure your parts will work correctly, before installing them. 92 mm. Not clear what you mean by the fork is "hitting" the bell housing. Also not clear which throwout bearing sleeve/collar you're using. You put the old pressure plate in but did you use the old sleeve? There are a bunch of bad combinations of sleeve and pressure plate out there. Clutch problems are common with the Z's. You're doing a lot of stuff but not providing much info to work with. Numbers. Good luck. Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579637 Share on other sites More sharing options...
July 15, 20195 yr Author comment_579668 8 hours ago, Zed Head said: We've produced several threads describing the measurements you should take to be sure your parts will work correctly, before installing them. 92 mm. Not clear what you mean by the fork is "hitting" the bell housing. Also not clear which throwout bearing sleeve/collar you're using. You put the old pressure plate in but did you use the old sleeve? There are a bunch of bad combinations of sleeve and pressure plate out there. Clutch problems are common with the Z's. You're doing a lot of stuff but not providing much info to work with. Numbers. Good luck. The pressure plates are definitely different in size, and here’s a video of what I’m talking about, you can hear the clutch fork bump the bell housing. Also I replaced the throwout bearing and I’m using the original sleeve and clutch fork. The throwout bearing I installed is identical to the one I removed 17125496-5A69-499E-A5DD-868AD0D8CBA9.MOV Link to comment https://www.classiczcars.com/forums/topic/62337-78-280z-idle-problem/?&page=10#findComment-579668 Share on other sites More sharing options...
Create an account or sign in to comment