You really have to be a guru to know how to fix this kind of throttle body, I had an '86 720 and gave me headache after headache, and the guy in Culver City CA. who used to fix them retired, so I sold the truck. And went ahead and got me a '91 Hardbody I have only changed one injector in 30 years, with 226K miles, it is running like a top.
Hey bro, thank you for the videos on the hardbody. I haven’t found anyone who does detailed videos like you do. Keep making those detailed videos bro, beer on me if you’re ever in LA man. 🍻👊🏽
This video is fantastic! I have a question. Is it possible that reg has failed without the fuel in the vacuum line? If so would you apply vacuum to the vacuum end of the reg to see if it holds vacuum pressure to verify failure?
@@EliTheOBDTech ok I'm gonna pop the cover and try to clean them when it stops raining any tips it's my first time messing with a d21 I'm a diesel guy I can figure it out anything to look for or be careful of and it idles ok for the most part when I first start it it has a bad rich faith it seems sometimes dies but if I start it and reg it it blows a little smoke out the tailpipe and idles up fine it runs like a top untill you get over half throttle thank you so much for the reply I have w bench seat with rusted bolts that sits right on top of my computer I don't even have an inch of play it's a Toyota bench seat and it will be hard to remove to check codes I know I should have done that first but I had been sitting a few years needed a tune up so I threw a few parts at it but I still have this issue was doing it untill I ran it ha to get out of a bad spot And after restarting it it runs like crap over half throttle I'm just hoping it didn't jump time
@@Mountainpageproductions Since you are mechanically incline, you have two choices, remove only the injector housing that bolts into the lower throttle housing. This method is bit tougher, but duable. The injector housing has Phillip head screws that can strip or be tough to get loose. Second method, remove the entire lower throttle housing with the injector housing attached to it.
@@EliTheOBDTech I saw in the vid if the o2 reads .8 ohms then it's rich what's ideal what should it be and thanks so much I think I'm gonna just grab a few new things I saw that someone remanufactured injectors for those trucks I haven't been able to find any new
I'm replacing my fuel regulator with an aftermarket unit that is remotely mounted. The adapter I got with the unit does not fit. I see you have the same throttle body mounted unit as my 1987 D21. I saw in another video of yours that you replaced your Fuel pressure regulator. Where did you get the adapter you used for your installation and what model number or part number was it? I purchased one but it was too big to fit in the hole.
Thanks alot!!! Yeah man, on these early obd1 Nissan d21 pickups you can't use a scan tool, you must retrieve codes manually and have some understanding of how these operations work. Scan tool will not save you, lol. I reside in pomona,ca.
I know this is a older video but i have a 1989 nissan d21 with the z24 at half throttle and over it stutters and been trying to figure out the issue…truck strong pulling off
@@bigguapo3145 Hey there, you may be dealing with a faulty MAF sensor. On nissans, they tend to only rev up to 2500 rpms when the MAF sensor is faulty. Another possibility would be a faulty throttle position sensor.
Can you help me with a failure in my 1986 Nissan V6 3.0, it happens that my truck does not exceed 3000 rpm. Several mechanics have checked it and they cannot find the problem. I would appreciate it.
I have An 86 Nissan hardbody z24 and it’s idling rough when I drive, it wants to shut off completely.. Do you have any idea on what it might be ? Or what I can do in my case ? 🙏🏽
Fuel delivery problem: Fuel pump, Fuel filter or dirty injectors. Air delivery problem: Dirty Mass Air Flow Sensor. It could be many things, start there.
Thank you so much for this video. You have no idea how much I have looked for any information on this. My truck is doing the same . Where are you located in CA ? Do you work on cars as a mechanic or only for videos ?
I have an 89 iv been looking for ideas on why when my truck is warm it idles real high around 1500 rpms. Checked for vacuum leaks and everything can't figure it out any suggestions?
I have a 1987 Nissan D21 Pickup Z24i that has always been well maintained. The engine has around 10k miles on it and the throttle body/injectors are original with around 125k miles. It has been running great, but all of the sudden started running rough at idle last weekend and appears to be running rich. I could not get the codes to show up on the ECU, so I cleaned the throttle body (which helped this go away one time before). I replaced the MAF sensor, cleaning the pins on the plug with contact cleaner. No improvement. Today I replaced the original oxygen sensor with an OEM Bosch unit. Again, no improvement. I tried placing my finger over the vacuum port as you did in your video, which did not result in fuel going into the throttle body as your example did. Any thoughts on what to do next? The fuel filter was replaced at the same time as the engine and I only use Top Tier fuel suppliers. Could it be injectors? Bad gas? I filled up the day before this started happening.
@@EliTheOBDTech Many thanks for your quick reply! It looks like TPS and ECT sensors are available, as is EGR valve. Injectors appear to be no longer available, plus removing them appears to require a removal tool unless I'm missing something. Plugs are relatively new, plus I installed NGK plug wires with new cap/rotor some years back. It seems like ignition problems would mean rough running throughout the RPM range, but in my case it seems to run okay (but rich) above 2k RPM. I'll check the easy stuff, but not sure how to approach injector issues.
@@tomroberds6803 pretty much when dealing with injectors. Best thing is to do an injector balance test with an injector balance tester and a fuel gauge and see how much fuel pressure is dropping.
@@EliTheOBDTech Thanks again, Eli. There are a couple of sellers on eBay that offer 'rebuilt' throttle bodies, but not sure if one or both are rebuilding injectors. They want $$$$ for these units, but with all of the ancillary devices that can go wrong, I may replace some of the ones you suggest first.
@@Hawaiicountrylivin It's really tough to help out, without being able to physically check your vehicle. The oxygen sensor is the triggering your code 21, the oxygen sensor is detecting a rich mixture in the oxygen stream.
@@EliTheOBDTech my Nissan d21 is sputtering and shakes I got a rebuilt engine by a reputable shop and I bought a rebuilt throttle body still have the issue , would u be interested in helping me out I’m in Temecula like 1.5 hours away but I’ll don’t mind the drive , seems you have experience with throttle body issues I took it to get smogged guy told me its running way to rich ! It’s a 1988 d21 with the z24 engine
@@EliTheOBDTech I have many vechicles so no rush just need it fixed , I changed the engine got a rebuilt one then the mechanic told me it was the throttle body got one rebuilt , and ever since I got it , it sputters and shakes when cold once it warms up it does it less , you tell me when I can swing by ?
@@808livin.8 in that case, it's either distributor or injector problem. They no longer sell new injectors for these models, only option sending it for a rebuild
You really have to be a guru to know how to fix this kind of throttle body, I had an '86 720 and gave me headache after headache, and the guy in Culver City CA. who used to fix them retired, so I sold the truck. And went ahead and got me a '91 Hardbody I have only changed one injector in 30 years, with 226K miles, it is running like a top.
I completely understand where you coming from. I've only done an injector replacement once on a 89 d21, it does take patience.
The 720 has a mechanical carburetor totally different
The Ka24 is totally different set up you have 1 injector and 1 spark plug per cylinder
Is there a way to bypass you think the regulator? Since you can’t purchase the regulator. Philips screws are sieved on the less. Thanks for the video.
Hey bro, thank you for the videos on the hardbody. I haven’t found anyone who does detailed videos like you do. Keep making those detailed videos bro, beer on me if you’re ever in LA man. 🍻👊🏽
This video is fantastic! I have a question. Is it possible that reg has failed without the fuel in the vacuum line? If so would you apply vacuum to the vacuum end of the reg to see if it holds vacuum pressure to verify failure?
Yes, it can fail without leaking fuel. The other fail would be high fuel pressure. Try doing the vacuum test to the regulator, it should hold vacuum.
@@EliTheOBDTech Great thank you!
Thank you for this video-I'll be looking for a used Pressure Regulator in the u-pick parts yard.
These are tough to find. An 88 pathfinder will also have this type fuel pressure regulator
How was the drivability I have an 89 this anything over 3k rpm during load it cuts out spits and pops bad is this the same issue
This truck ran bad during any load range or idle. Your problem might be a faulty or dirty injector.
@@EliTheOBDTech ok I'm gonna pop the cover and try to clean them when it stops raining any tips it's my first time messing with a d21 I'm a diesel guy I can figure it out anything to look for or be careful of and it idles ok for the most part when I first start it it has a bad rich faith it seems sometimes dies but if I start it and reg it it blows a little smoke out the tailpipe and idles up fine it runs like a top untill you get over half throttle thank you so much for the reply I have w bench seat with rusted bolts that sits right on top of my computer I don't even have an inch of play it's a Toyota bench seat and it will be hard to remove to check codes I know I should have done that first but I had been sitting a few years needed a tune up so I threw a few parts at it but I still have this issue was doing it untill I ran it ha to get out of a bad spot And after restarting it it runs like crap over half throttle I'm just hoping it didn't jump time
@@Mountainpageproductions Since you are mechanically incline, you have two choices, remove only the injector housing that bolts into the lower throttle housing. This method is bit tougher, but duable. The injector housing has Phillip head screws that can strip or be tough to get loose. Second method, remove the entire lower throttle housing with the injector housing attached to it.
Other possibilities that may cause your symptoms, dirty or faulty MAF sensor, leaking injector or pressure regulator and faulty O2 sensor.
@@EliTheOBDTech I saw in the vid if the o2 reads .8 ohms then it's rich what's ideal what should it be and thanks so much I think I'm gonna just grab a few new things I saw that someone remanufactured injectors for those trucks I haven't been able to find any new
I'm replacing my fuel regulator with an aftermarket unit that is remotely mounted. The adapter I got with the unit does not fit. I see you have the same throttle body mounted unit as my 1987 D21. I saw in another video of yours that you replaced your Fuel pressure regulator. Where did you get the adapter you used for your installation and what model number or part number was it? I purchased one but it was too big to fit in the hole.
I replaced it with a used one from a 88 nissan pathfinder. Its very hard to come by a used one now a days.
Good diagnosis on the old school Nissan! Until today I didn't know you were in CA ;)
Thanks alot!!! Yeah man, on these early obd1 Nissan d21 pickups you can't use a scan tool, you must retrieve codes manually and have some understanding of how these operations work. Scan tool will not save you, lol. I reside in pomona,ca.
I know this is a older video but i have a 1989 nissan d21 with the z24 at half throttle and over it stutters and been trying to figure out the issue…truck strong pulling off
@@bigguapo3145 Hey there, you may be dealing with a faulty MAF sensor. On nissans, they tend to only rev up to 2500 rpms when the MAF sensor is faulty. Another possibility would be a faulty throttle position sensor.
Can you help me with a failure in my 1986 Nissan V6 3.0, it happens that my truck does not exceed 3000 rpm. Several mechanics have checked it and they cannot find the problem. I would appreciate it.
@@noelsantos8426HI there! First question, did any of them check the MAF sensor? It almost sounds like a MAF sensor problem.
Second potential problem, a faulty or mis calibrated TPS sensor.
I have An 86 Nissan hardbody z24 and it’s idling rough when I drive, it wants to shut off completely.. Do you have any idea on what it might be ? Or what I can do in my case ? 🙏🏽
Fuel delivery problem:
Fuel pump, Fuel filter or dirty injectors.
Air delivery problem:
Dirty Mass Air Flow Sensor.
It could be many things, start there.
@@EliTheOBDTech Awesome appreciate the suggestions! I’ll definitely have to take a look at those
Thank you so much for this video. You have no idea how much I have looked for any information on this. My truck is doing the same . Where are you located in CA ? Do you work on cars as a mechanic or only for videos ?
I'm glad to hear that this video was helpful. I'm located in the city of Pomona, CA. I pretty much work on cars as a side job on weekends.
@@EliTheOBDTech by Amy chance do you have any extra fuel pressure regulators for my truck ? And if I took it to you how much do you charge to fix it ?
@@Lio88 unfortunately, I don't. These are very tough to find. What year is your truck?
I got lucky and found at the junkyard.
@@EliTheOBDTech it’s a 1986
I have an 89 iv been looking for ideas on why when my truck is warm it idles real high around 1500 rpms. Checked for vacuum leaks and everything can't figure it out any suggestions?
Your problem could be the fast idle air control valve or your idle air control valve, one or the other.
Very helpful. Thanks
Thank you eli very good tip on what to look for in code tdc 45, un saludo
Gracias!! Igualmente!
I have a 1987 Nissan D21 Pickup Z24i that has always been well maintained. The engine has around 10k miles on it and the throttle body/injectors are original with around 125k miles. It has been running great, but all of the sudden started running rough at idle last weekend and appears to be running rich. I could not get the codes to show up on the ECU, so I cleaned the throttle body (which helped this go away one time before). I replaced the MAF sensor, cleaning the pins on the plug with contact cleaner. No improvement. Today I replaced the original oxygen sensor with an OEM Bosch unit. Again, no improvement. I tried placing my finger over the vacuum port as you did in your video, which did not result in fuel going into the throttle body as your example did. Any thoughts on what to do next? The fuel filter was replaced at the same time as the engine and I only use Top Tier fuel suppliers. Could it be injectors? Bad gas? I filled up the day before this started happening.
Possibilities:
Faulty TPS sensor
Plugged EGR system
Faulty ECT sensor
Ignition system
Dirty or leaking injector(s)
@@EliTheOBDTech Many thanks for your quick reply! It looks like TPS and ECT sensors are available, as is EGR valve. Injectors appear to be no longer available, plus removing them appears to require a removal tool unless I'm missing something. Plugs are relatively new, plus I installed NGK plug wires with new cap/rotor some years back. It seems like ignition problems would mean rough running throughout the RPM range, but in my case it seems to run okay (but rich) above 2k RPM. I'll check the easy stuff, but not sure how to approach injector issues.
@@tomroberds6803 pretty much when dealing with injectors. Best thing is to do an injector balance test with an injector balance tester and a fuel gauge and see how much fuel pressure is dropping.
These injectors are notorious for getting clogged up. The only way to replace, is to send them to get rebuilt.
@@EliTheOBDTech Thanks again, Eli. There are a couple of sellers on eBay that offer 'rebuilt' throttle bodies, but not sure if one or both are rebuilding injectors. They want $$$$ for these units, but with all of the ancillary devices that can go wrong, I may replace some of the ones you suggest first.
Stupid question. Is it the regulator or the o2 sensor that makes it run shitty? Can I unpulg the sensor?
Both situations can lead to the vehicle to run with problems. A bad pressure regulator will cause the vehicle to stumble and run poorly.
A faulty o2 sensor will cause to either run lean or rich and lower your gas mileage and at moments run poorly as well.
You can unplug the o2 sensor and see if the performance of the vehicle gets better, that will tell you if your o2 sensor is the problem.
Will a bad injector send the ecu into limp mode and will a weber fix it.
Being non-obd 2, it should not be able to go into limp mode.
Not sure about the weber.
@@EliTheOBDTech I've gotten codes 51 and 21.
@@Hawaiicountrylivin It's really tough to help out, without being able to physically check your vehicle. The oxygen sensor is the triggering your code 21, the oxygen sensor is detecting a rich mixture in the oxygen stream.
@@EliTheOBDTech is that the mass air flow I'm waiting to put a new one.
What part of ca are you located ?
Pomona
@@EliTheOBDTech my Nissan d21 is sputtering and shakes
I got a rebuilt engine by a reputable shop and I bought a rebuilt throttle body still have the issue , would u be interested in helping me out I’m in Temecula like 1.5 hours away but I’ll don’t mind the drive , seems you have experience with throttle body issues I took it to get smogged guy told me its running way to rich ! It’s a 1988 d21 with the z24 engine
@@peteramirez50 How bad or how soon you need your truck fixed? I no longer work on cars on a regular basis, I only do it on my days off.
@@EliTheOBDTech I have many vechicles so no rush just need it fixed , I changed the engine got a rebuilt one then the mechanic told me it was the throttle body got one rebuilt , and ever since I got it , it sputters and shakes when cold once it warms up it does it less , you tell me when I can swing by ?
@@peteramirez50 Will do.
Wow thx alot my nissan model 1992 has a same problem need a mechanic to fix it
where can i find the vacuum hose diagram for that truck
AllData or Mitchell OnDemand
Here is a link that might help you:
diyservicemanuals.com/nissan-hardbody-d21-truck-service-repair-manuals/
www.nicoclub.com/nissan-service-manuals
Why could my truck be jerking at 2800 rpmsm
Either not enough fuel pressure at that point or maf sensor, tps sensor.
@@EliTheOBDTech all of those thing are brand new.
@@EliTheOBDTech my codes show 21 ignition and 51 injectors...cant find new injectors
@@808livin.8 in that case, it's either distributor or injector problem. They no longer sell new injectors for these models, only option sending it for a rebuild
@@EliTheOBDTech i have a whole new distributor like 4yrs ago could that go bad.