IamZHead

Thanks - I was not going to get a set with gauges - but perhaps this is the wisest thing to do to understand the pressure in the system. Can anyone verify? - The vacumn pull only brings out the freon not the oil - Can I have the system vacumned by a professional and then add my own R12 after to an empty system - That I need a new dryer. - That I add 9.5oz of Refrigerant Oil to the low side - what type is compatable with R12 - How do I check the current level of oil? - Pull a vacuum to like (-25 to -30 atm) and let it sit for 30 mins. - Check for leaks (Needle rising). - If all is good and with the engine off, put one can of R12 in AS LIQUID (can held upside down) into the system. Start engine and top off with R12

1st - This site is AMAZING, and an incredible resource - kudos to the creators and participants I have a 76 280z with 21K original miles - and yet even with that low mileage - I am still bringing her back to a better life. That is, one where she is driven (whenever its not raining or snowing). This Summer - I thought I would try to bring back the AC. The AC state: - - everything seems to run - Ihavenot done a leak test or a vacumn pull - bubbles are viewable through the recevier / drier when AC is running - I have the original connections on the compressor - I assume the system is still R12 I'm not comfortable with the conversion to 134A yet (smaller molecules - pressure increases - etc). I recently bought some R12 on Ebay and I want to try recharging the system. Does anyone know if these Datsun compressors used a universal type mount / thread and if these R12 recharge hose / kits they sell on EBAY will fit. Nobody one up here (garages) will not put in R12 into a unit - and I cannot find a recharge hose - so I am going back to EBAY. Thanks Any comments on rechargin an R12 unit - would be helpful - I don't want to hurt the environment or myself....or my Z!!

Thanks All The fuel filter was replaced and when we tore it open the old one it was "half full" of what I would call a fine, almost clay-like particles - could have been rust...could have been sabotage. But who would do something like that to a machine like this !!! I really got to get a locking gas cap. I am going to look into the tank cleaning as well - I have a new coil so that is one is on the agenda - I am thinking about bringing out the OHM meter and going into ECU diagnostics - I picked up the EFI book and its a good read. As for the rest I am going to mention it to my mechanic as ideas. I must say I am gettign a bit discouraged - never had this issue with the carb set up in the 72 240Z Fact is there are no Z's up here anymore and no Z mechanics God Bless!!

Had a 72 240z in my early twenties – sold it to go back to school – 20 years later I buy a 76 280z. This one is special…but aren’t they all!! Anyways – the history – after importing it into Canada and driving it for two Summer’s I am driving it to the garage for Winter storage, seriously. Suddenly, I feel a loss of power (50%) when I accelerate...or effectively no power gain when I apply the gas – like there is air or a void when I press on the gas and nothing is burning at the cylinders...no RPM movement...jst dead air. Pedal goes down but nothing happens. Car starts jerking a bit - it doesn't like this, and neither do I. With some slight gas pedal feathering I manage to get it to the garage and put her to bed – really wonky considering everything was working fine up until then. Jump ahead one year – I have been buying some parts on Ebay over the winter...with the assistance of my local mechanic - Put in new injectors - Put in new fuel pump - Put in a new AFM (That was an easy one haha) We have spark, we have fuel pressure at the injectors, and now we have air. I start her up she sounds great, I le ther idle for a bout twenty minutes – warms up – I ease her out things seem good then wham – gas pedal doesn’t seem to have any reaction - loss of power - progresss to no power – I notice when I press on the gas pedal – there is the void and then she starts to die (idle drop) - I release the pedal and she returns to a nice idle, press down and she dies, release she comes back - regardless of gear 1st or reverse – cannot get her into 2nd and I cannot even move her from the her current position without her dying - I turn her off and let her sit for about 10 minutes - Engine is warm – start her up and shes fine – gas pedal works, RPMs work This problem is intermittent and regardless of a cold or warm engine it occurs I can’t seem to find out what is happening inside. I am a bit afraid to take her out on the street, until I find the bug. EFI Relay? Contact somewhere? Has anyone had this happen to them or can they recommend a solution. My mechanic is a bit stumped as well We have not tried any ECU - voltmeter testing of all the relays etc Please Winter is coming and I want to get her working Thanks All