Mario73 Posted November 29, 2020 Report Share Posted November 29, 2020 So I'm new to datsun and the forums. Picked up A 73 620 already with a KA24 swapped BUT is very hard to keep the car on specially when cold. It will crank no problem but it will just sputter off. After trying and trying for while (30 mins) it will stay on and will smooth out once warm. Any help will be appreciated before I start chasing the problem. Thanks 🤙🏾 Quote Link to comment
datzenmike Posted November 29, 2020 Report Share Posted November 29, 2020 Welcome. Does this have the EFI or was it 'converted' to carburetor? Don't be shy posting pictures. Quote Link to comment
Mario73 Posted November 29, 2020 Author Report Share Posted November 29, 2020 1 hour ago, datzenmike said: Welcome. Does this have the EFI or was it 'converted' to carburetor? Don't be shy posting pictures. Thanks, it's fuel injected and there's a few mods ill be posting pics. I just brought the truck home today so haven't really poked at it. Quote Link to comment
datzenmike Posted November 29, 2020 Report Share Posted November 29, 2020 I'm ore of a carburetor guy. EFI is a little right of VooDoo. Quote Link to comment
Moist Lightning Posted November 29, 2020 Report Share Posted November 29, 2020 Did you check the ECU light for error codes. Depending on year if its pre obd2 then the ecu has a light on it that will flash a series of short and fast blinks to give an error code. The newer ones might need a tool to read the codes, cant find my other ecu at the moment to check though. 1 Quote Link to comment
]2eDeYe Posted November 29, 2020 Report Share Posted November 29, 2020 Dual or single cam? What are the mods? Quote Link to comment
Mario73 Posted November 29, 2020 Author Report Share Posted November 29, 2020 https://linksharing.samsungcloud.com/guuNOc6pfQVa Here are some pictures of what I'm dealing with. Hope you guys can see it I was having a hard time uploading pictures. I'm wondering if whoever built this out in the SF bay area is on here? Truck seems to have some good bones hopefully I can get it running soon. Quote Link to comment
datzenmike Posted November 29, 2020 Report Share Posted November 29, 2020 DE from an S13/14 Maybe someone knows but normally the valve cover vent does not go to a filter like this. Isn't it connected to the air pipe between throttler body and the MAF??? Poor cold idle.... maybe look at the AIC idle air control valve. Quote Link to comment
]2eDeYe Posted November 30, 2020 Report Share Posted November 30, 2020 definitely check for codes. You have an obd1 ma24de, it is fairly simple. Turn the ignition on and turn the screw on the ecu to the right and count the flashes. you can google for the full procedure and code list. Mike has a good suggestion as well. The idle air control system is what acts as the ‘choke’ as part of its function Quote Link to comment
]2eDeYe Posted November 30, 2020 Report Share Posted November 30, 2020 Mike that vented line runs to the intake tube on a stock intake system. Quote Link to comment
Icehouse Posted November 30, 2020 Report Share Posted November 30, 2020 Vent tube is fine. Checking codes is a good start. Also check and see if the ilde air control stuff is wired up. Redeye would know about that :). There are two idle air control valves. One that is similar to a chock, it just gets constant 12v while it warms up it shuts a "air leak" which then idles down the engine. The other is controlled by the ecu, if the alternator clicks on or in stock form the power steering pump engages, it needs a few more RPMs it can make it happen. Technically there is a 3rd for the AC but you don't need to worry about that one. Usually a purple plug. 1 Quote Link to comment
datzenmike Posted November 30, 2020 Report Share Posted November 30, 2020 I thought someone had one once and if unplugged the idle would falter. Quote Link to comment
]2eDeYe Posted November 30, 2020 Report Share Posted November 30, 2020 That was probably the line to the IACV system. Quote Link to comment
FrankRizzo Posted December 1, 2020 Report Share Posted December 1, 2020 Looks like an S13 because 3 head bolts and looks like an external coil. Check your air intake tube. Looks like it is sitting right on top of the dizzy wires. I know from experience that after a while it chafes and causes headaches. . Quote Link to comment
Mario73 Posted December 1, 2020 Author Report Share Posted December 1, 2020 Thanks everyone 🙏🏽. So started to poke around and got the codes. Calls for 34-knock sensor, 12- air flow meter. 13- temp sensor. I'm replacing those and doing a good tune up. Surprisingly I get the car on without the MAF sensor on but as soon as I plug it in car stalls. Also planning on removing the gas tank and cleaning it out. Since its been sitting and its an old truck. I'll keep you guys posted. Thanks for the help. 1 Quote Link to comment
]2eDeYe Posted December 1, 2020 Report Share Posted December 1, 2020 knock sensor will cause acceleration issues. MAF issue is weird, i wonder if something was bypassed or shorted Quote Link to comment
Mario73 Posted December 1, 2020 Author Report Share Posted December 1, 2020 1 hour ago, ]2eDeYe said: knock sensor will cause acceleration issues. MAF issue is weird, i wonder if something was bypassed or shorted I think there was a ton of stuff bypassed, none of the gages work, and I have an ignition switch thats connected to a relay box that buzzes when its turned on. But definitely there's some weird stuff happening with the wiring I think. 1 Quote Link to comment
]2eDeYe Posted December 1, 2020 Report Share Posted December 1, 2020 The buzzer is probably the factory 620 seatbelt buzzer. 1 Quote Link to comment
]2eDeYe Posted December 1, 2020 Report Share Posted December 1, 2020 Just noticed the temp sensor code. That will cause problems on warmup as well as under acceleration. 1 Quote Link to comment
FrankRizzo Posted December 2, 2020 Report Share Posted December 2, 2020 I'd reset the ECU and see what codes come up again. If anybody unplugged the MAF or knock sensor in the past, it will hold those codes forever until you reset ... and send you on a wild goose chase. . 2 Quote Link to comment
Mario73 Posted December 7, 2020 Author Report Share Posted December 7, 2020 Thanks for all the feedback, hope everyone is safe out there. So I sharing a video about thats going on on here. 1- changed the MAF. 2- changed the temp sensor. 2- got new gas and filter. Still can't get it to stay on. https://linksharing.samsungcloud.com/gfl4vFpAaYR6 1 Quote Link to comment
FrankRizzo Posted December 7, 2020 Report Share Posted December 7, 2020 Reset the ECU and see what the new codes are. When the engine is running, spray carb cleaner all around around the intake area and listen for engine changes. If you have a vacuum leak, it will show up because the idle will jump up slightly as it sucks cleaner into the leak. Vacuum leaks need to be fixed. Make sure that little hose that goes into the intake pipe right before the throttle body is not kinked, broken or disconnected, its hard to see from the video. See the youtube video below. Google IACV KA24DE. Your idle air control valve might be dirty or blocked - tons of info on line about how to clean it. Idle Air Control Valve. . 2 Quote Link to comment
Mario73 Posted December 19, 2020 Author Report Share Posted December 19, 2020 Thanks everyone for the support. After a few hours of chasing the possible problems Turns out my fuel pressure is too low. I managed to keep it on when pinching the return line and it kept running smooth for as long as the line was pinched. Will order a new regulator and will test it again. 2 Quote Link to comment
Mario73 Posted January 3, 2021 Author Report Share Posted January 3, 2021 Happy new year everyone.... so I'm back to square one. Truck ran after I fixed the fuel pressure regulator and now it's back to doing the same it turns on but won't stay running. Checked for vacuum leaks and nothing even took the intake manifold off to make sure everything was properly installed and nothing. One thing I did notice was some wires are ripped off maybe will do some wire replacement next. Thanks for the help... cheers Quote Link to comment
]2eDeYe Posted January 3, 2021 Report Share Posted January 3, 2021 How long did it run after you replaced the regulator? Quote Link to comment
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