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Showing results for tags 'Vacuum'.
Found 5 results
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Just bought the FAST EZ-EFI kit from Z Car Depot for my 1983 280zx. Put it on my car the other day and it runs worse than it ever has. Car will idle but is very hard to start and really rough when it's running. Using any more than 1/4 throttle will stall the engine. When I am able to rev the engine it's terribly rough. Feels like or an ignition timing issue. I know that when I removed the old EFI harness I disconnected a connector going into the distributor and the new harness did not have a connection to plug back in to the dizzy. Since adding the EZ EFI, ignition timing has retarded itself about 10 degrees at idle. Advancing timing does not help the issue. I have setup the ECU with all the correct parameters listed with the info from zcardepot. ECU doesn't throw any codes, all readings seem mostly normal for not being tuned. It feels like it could be a vacuum leak or vacuum not hooked up correctly as well however my vacuum readings are perfectly normal. Has anyone else has this issue? I will add pictures of the engine in it's current state along with the connections that were left unplugged when adding the EZ EFi kit, Including the oil temp sensor. Does this stuff really get left unplugged?
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I have heard many times that these l28 EFI engine will stall if you remove the dip stick/ pcv hoses while the engine is running, however mine will stay running without any of those things in place. Does anybody know why that would be? I recently replaced the pcv valve to see if that was it but that made no difference. I've been told vacuum leaks will cause this however my manifold vacuum readings are proper through the whole rpm range. Starting to think it's gotta be piston rings or something...
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Hi guys, I'm having a few issues with my brakes: is extermely hard to stop my car, the pedal feels like a rock after about an inch of travel. I have a 75 280z with Lt1 and a 503 cam, 280zx 10" booster (new), 1" wilwood MC (new), front stock disc brakes and rear drum brakes with all new hardware, and 9 inch of vacuum at the booster port.. Do you think the 9 inch of vacuum are too low or could be any other thing to check? or maybe having a 10 inch booster and 1 inch MC could be compensated installing toyota 4 pistons caliper? Thank you in advance, Selvin -
Hello fellow Z Enthusiasts, I'm at my whits end here from this Darn Datsun. I've got a 1983 Datsun Maxima, and I can't for the life of me figure out how to get this thing running properly. A-little backstory on the car; The car used to belong to my grandfather, and when he passed away my father inherited it and drove this old girl everyday for 5 years to work, All the way up until the point the engine slipped its timing gear, then it sat for another 7 years until I was old enough to understand cars and not hurt myself while working in the garage. After purchasing a new timing chain and replacing the old one, the car ran fine. Well, my brother was using the car while his was in the shop during this last summer, but the dummy doesn't know a THING about cars and never checked the oil, water/coolant level, etc.; pretty much everything that you need to check on old cars to make sure they dont explode while driving them. Well, this time he didn't check the water level, called my father asking "why it was overheating all the time". And as he was driving it back to our house, the poor car blew the head gasket. Months of work down the drain (and wallet, mind you). It sat for another 2 months, until we managed to get the money to buy a new gasket. (Now THAT was one heck of a time, trying to figure out how to take the head off) We eventually got it replaced, but and hooked everything back up, but upon starting the engine we realized it wouldn't drive correctly. Let me explain; When you started the engine, it would idle great. It revved in idle like a dream as well. Then you'd try driving it; Ohhh boy, was there a problem. The thing would lurch and pop forward worse then a dang blender paired with a v8 engine runnin on 3 cylinders. Back to the garage I suppose. Everything looked fine, but we read in the manual that the oil pump timing gear needs to be 5 degrees past the time marks at 8degrees past TDC. Well, we were off, so we tried setting it how the book looked. Tried again. Cranked and backfired, and eventually got it started that way, but even then it ran so bad that it would die when you gave it just a tiny bit of gas. Back to the garage... We noticed that when we turned the distributer clockwise, it would run better, so we decided that instead of setting the Oil Pump Timing Gear at 5 degrees PAST the timing marks, we'd set it 5 degrees BEFORE the timing mark, still at 8 degrees TDC. Started it up, and amazingly it ran. It ran actually pretty good, which was surprising because it was the complete opposite of what the book called for. Our engine, a L24E non-Cali engine runs OUT of time, not IN time. But it was still out of time and not "drive able" (still lurched) and after hooking up a timing light to the engine, we discovered that the car would idle at 20 degrees, then drop down to 0 when you gave it gas, which would explain the lurching and backfiring. We thought we'd messed up on timing chain, so we checked that but it looks just like its supposed to. After a month of trying to time the car with the Oil Pump Timing Gear, we called 9 to 9 and Tom said that we needed to reset the computer. He said no matter what we did, the engine was fighting to put the engine back in time, so after a quick reset, we'd need to retime the engine again and it should be good. Well after resetting the computer and retiming the engine, the engine wouldn't even start this time. After fiddling with the Distributer and Timing Gear again, we got it running, and the engine now advances correctly when you give it gas. It no longer drops to 0, it goes up with the RPMs. We then tried driving it... Same thing again, only this time worse. It lurches so bad it could give you whiplash if you weren't careful. We think it may be a vacuum line, but they look hooked up correctly and we can't find any leaks, so we are literally going insane trying to figure out this engine. If anyone's been through the same problem or has an idea on what the problem might be, let me know what I could do to try and fix this. Thanks!
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Stock 280z setups use a vacuum system powered by manifold vacuum to operate various the water cocks and FICD. On a turbo system, without the vacuum accessories like the tank and VCM, using the heater is theoretically difficult, plus the control panel looks out of place in the surprisingly modern interior of the s30. So why not swap out all the vacuum actuation, and the mechanical linkage, and install the modern HVAC controls from a newer vehicle? Has anyone done this? My overall dream is to make my s30 a formidable GT even by modern standards, and it's coming along well. If nobody has tried this, I may need a few pointers as to vehicles with relatively standalone HVAC controllers. A 2000s Mustang comes to mind. The more I can shrink the size the better the end result.
