dream240z Posted January 20, 2016 Share Posted January 20, 2016 Hi all, I have searched far and wide with the search feature but to no true availe. So let me start by saying this problem is destroying me lol. So I bought my dream z that ran great 2months ago. She had almost no brakes and stances Jerry rigged and welded Honda struts. I replaced everything with new stock parts while she was still running. Then suddenly after using seafoam in the gas tank that morning on the drive home she lost all throttle responds and power then died. I bought a rebuild kit. And got her towed to a shop. They realized the only problem was the suction chambers had no oil, so they filled them and tuned the carbs. She drove great for a few days so I installed a pertronix ignition, new radiator, new slave cylinder to get my clutch back, new gas tank (old one leaked everywhere) new exhaust and muffler. Than she started up again with the stalling and feeling like she was running on half power. Than she died. Got her towed back to the shop, cause I knew after the new ignition the timing needed to be reset. And I shouldn't have but in trying to get her to run I messed with the tuned of the carbs. So the shop replaced my fouled plugs from my tinkering lol reset the carbs and tuned them, set my ignition timing, and said she was running. I picked her up after shop hours and drove 1 mile before she stalled and died again, thought it was an empty gas tank so put 2 gallons in after a long walk and a 20$ gas can, than she ran great for another mile till she stalled again, noticed my oil pressure seam almost zero but i that wouldn't cause a stall. I'm so confused at this point. Please help Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted January 20, 2016 Share Posted January 20, 2016 Tell us what you have first of all. Dream Z isn't much to go on My 1st thought would be a fuel issue, since you put seafoam in the tank, you've prolly got alot of trash/rust scale that has plugged up the filters. Thats where I'd start looking... Once you provide a little more info., I'm sure others will help you more than I did. Good luck! Quote Link to comment Share on other sites More sharing options...
dream240z Posted January 20, 2016 Author Share Posted January 20, 2016 Sorry I posted it in s30, but she is a 1970 240z running stock round top carbs Quote Link to comment Share on other sites More sharing options...
dream240z Posted January 20, 2016 Author Share Posted January 20, 2016 Also I forgot to mention the surging and stalling is only after engine is warm. Quote Link to comment Share on other sites More sharing options...
malibud Posted January 20, 2016 Share Posted January 20, 2016 sounds like you aren't getting fuel ... like RB said prob. junk in fuel tank Quote Link to comment Share on other sites More sharing options...
malibud Posted January 20, 2016 Share Posted January 20, 2016 and my oil pressure gauge doesnt work well. Mine said 0 at idle . I put a mechanical one on from harbor freight had 10 psi Quote Link to comment Share on other sites More sharing options...
dream240z Posted January 20, 2016 Author Share Posted January 20, 2016 Still fuel? Ok I will buy a new pressure sender just to fix the guage, but I replaced my front fuel filter but I have one just before the tank so I will check that one next. And let you know how it goes. Quote Link to comment Share on other sites More sharing options...
NewZed Posted January 20, 2016 Share Posted January 20, 2016 Watch the tachometer needle. It will tell you if you're losing spark. If you're in gear coasting, powerless, and the needle shows spark from the engine spinning, it's probably a fuel problem. Quote Link to comment Share on other sites More sharing options...
seattlejester Posted January 20, 2016 Share Posted January 20, 2016 (edited) Simple question of what caused it to die. Car needs a few things to run, fuel, spark, air, compression. You are getting air, some spark, some gas, and compression if the car is running for bits. That leaves two remaining. Spark and gas. Since the car is running you are getting both of those for at least a little while. Gas is pretty simple to check, pull off the return line and see if the fuel is coming back strong. Unfortunately this can only be done with the car on as it is a mechanical pump on the 240z, I suspect as the others that you are running out of fuel pressure. A small electric pump may help to push fuel up to a tired mechanical pump, but it will not be much help if you have a bunch of junk in the filters clogging fuel flow. You could use starting fluid when it stalls to see if it is the fuel. If the car starts and runs on starting fluid then spark is fine and it is more or less a fuel delivery problem. Alternatively there is spark, if the coil cannot build up enough charge, the rotor is burnt, the spark plugs are fouled etc, it could be loosing charge. Quite a few ways to check, my favorite being an inline spark tester. Even if you have all the other perfect things, a discharging coil will slowly stall the car out. Oil pressure is finicky. It could be a sender or something more worrisome like a pump that is worn down and not pushing any oil. The pumps on the L-series are pretty well known for being hardy, so I don't think it is the latter. Still making sure you are getting oil pressure would be a good idea, a mechanical gauge could be threaded in to check and see how accurate the sender is sending. Making sure you have oil is also a good idea, no oil pressure = no oil circulation = seized engine = engine stalling and not starting up again, so it could be related, but hopefully not. Edited January 20, 2016 by seattlejester Quote Link to comment Share on other sites More sharing options...
dream240z Posted January 21, 2016 Author Share Posted January 21, 2016 Fixed it. Thank you so much. It looked like a grounding 12v connection at the fuel pump then a double pinched fuel line from pump to engine. Crazy but she runs like a champ now. Thank you so much guys. Quote Link to comment Share on other sites More sharing options...
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