naviathan Posted January 19, 2007 Share Posted January 19, 2007 I remember reading a while back about the fuel rail cooling fan and how the early ZX doesn't stay on after the ignition shuts down, but the 83 does. There was a mod to fix that problem on the early model and I can't remember where it is. I've tried searching the forums and going through all the tech tips in my bookmarks, but I have come up empty handed. Who remembers this mod? Thanks! Quote Link to comment Share on other sites More sharing options...
1 fast z Posted January 19, 2007 Share Posted January 19, 2007 I KNOW 79's and 80's stay on for 17 minutes if the water temperature is at or above 220 deg F after the key is tuned off. I belive ALL zx's were this way. Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 19, 2007 Author Share Posted January 19, 2007 My 81ZX doesn't. The EFI cooling fan comes on while it's running sometimes, but when I turn the ignition the cooling fan goes off as well. Quote Link to comment Share on other sites More sharing options...
Sumo Posted January 19, 2007 Share Posted January 19, 2007 I used to have an 82 where the fan stays running after the ignition is switched off, I believe 79 to 83 all did. Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 19, 2007 Author Share Posted January 19, 2007 This is the 2nd 81ZX I've had and neither of them have had the fan stay on after the ignition went off. And I read a mod somewhere to keep the fan on after, so obviously they didn't all stay on. Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 19, 2007 Author Share Posted January 19, 2007 Ok I started checking through the FSM and although it's for an 82 not an 81 I think I may have an idea of what's going on. It appears the only way that fan can kick on while the car is running is if the ignition relay for some reason opens signaling the ignition is off to the fan motor timer unit. No I just need to find all these components and figure out what the issue is. Quote Link to comment Share on other sites More sharing options...
COZY Z COLE Posted January 19, 2007 Share Posted January 19, 2007 I KNOW 79's and 80's stay on for 17 minutes if the water temperature is at or above 220 deg F after the key is tuned off. I belive ALL zx's were this way. This is the key statement. The fan will not come on when you shut the car off unless the water temp is 220 deg. or greater and this includes the 79 and 80's models. This is true if everything is working right... LARRY Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 19, 2007 Author Share Posted January 19, 2007 Ok but if I drive around and get the car completely warmed up then stop at say a gas station or someplace where I'm only going to be there 30 minutes or less when I restart it acts like it's vapor locked and the temp gauge reads well over center gauge for about 30 seconds until everything gets moving again. Quote Link to comment Share on other sites More sharing options...
HizAndHerz Posted January 19, 2007 Share Posted January 19, 2007 Not saying that this is your problem, but on two of my 280z's, leaking injectors caused what appeared to be vapor lock problems. Seemed to only happen when the car was hot. The leaks were slow enough that the cars didn't run rich, but would cause flooding of one or two cylinders after a few minutes of sitting. I pulled to fuel rail with injectors and hoses intact and sure enough, after pressurizing the system there was the occasional drop of gas from the tip of one of the injectors. Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 19, 2007 Author Share Posted January 19, 2007 Hmmm interesting. I may have to look into that possibility. Would sonic cleaning the injectors stop them from leaking or is that just the end of it when they start? Quote Link to comment Share on other sites More sharing options...
COZY Z COLE Posted January 20, 2007 Share Posted January 20, 2007 I have the 80ZX FSM and in the engine fuel section under Trouble Shooting there's a section called.. Engine hard to start only when hot. It indicates to check the cold start value and the thermotime switch. If your 82 FSM doesn't have this section I can post how to check them. A faulty cold start valve would be spraying excess fuel into a hot engine therefore causing trouble in starting it as opposed to a cold engine start. LARRY Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 20, 2007 Author Share Posted January 20, 2007 Now that makes a lot of sense. Maybe next time I'll just disconnect the harness from the cold start valve and see if that works. Thanks. Quote Link to comment Share on other sites More sharing options...
atx_s130 Posted January 20, 2007 Share Posted January 20, 2007 i took that fan off i feel no different car runss the same Quote Link to comment Share on other sites More sharing options...
naviathan Posted January 20, 2007 Author Share Posted January 20, 2007 Well I assumed I was getting vapor lock, but it looks like it's leaking injectors. Not surprising. Quote Link to comment Share on other sites More sharing options...
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