Vacuum hose diagrams

Here is one for you to start with. I am sorting through and I will add more when I find them.

Regards,

Jon

Thank you Jon. I got all my vacuum hoses back in place and all the various plugs also. Though I am not sure about the four injector plugs. Although they seem to fit okay according to the length of wiring in the harness they pretty much have to fit in a particular injector. I have all the hoses back in place except two. Number one very bottom of intake manifold. A pipe about three inches long and comes out and turns 90 degrees. This has me stumped, either a vacuum line or could it be a coolant line. Number two below the top radiator hose goose neck I call it. There is a small box like part that bolts onto timing chain cover with a sleeve for a coolant line. But where does the other end go to? It seems like maybe bypass hose maybe a 1/4 inch diameter. Sorry for not having a picture for you but can send you a picture if needed. Maybe shed some light. Now for the big one. Today I tried to start it, nothing. But spins over no start. Number one piston at TDC. Rotor points to number one plug wire on cap. Plug connected to the number one wire does fire. Does not seem like it is firing at all. I smell gas after each time trying to start it. I guess if I cannot figure it out soon I will just junk it. I spent over $1,000.00 rebuilding it. But I am getting too old to do this type of work anymore. If you can make any sense of all this and can think of a quick fix please let me know. The truck is in great shape no rust, AC blows ice cold. Thanks. Jon God bless. The freeze plug in the back of the head blew out and ran got. The only reason it is not still running fine. Had this truck almost fifteen years. No problems.

Hello,

Can you upload a picture of what you are talking about as we can get a clear view of what's going on? For the starting issue please start a new question.

Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken

Hi Ken,

JC here thanks for your response. I have tried to upload a photo a couple of days ago with no luck. I need to have my phone checked out as well. I am not sure which question your responding to but I have the truck running but not very well my last question was gas dripping out of exhaust. I have since learned my number 2 injector on the rail is stuck in the open position and constantly dumping gas into the cylinder I am thinking. Can you tell me if this gas is going into my crank case? Requiring an oil change?
Thanks Ken. JC

Yes, you need an oil change and a new injector. Here are guides to help you get started:

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

and

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

Please run down these guides and report back.

Cheers, Ken

Thank you Ken. I am ordering the injectors all new. Should I do the same with the fuel regulator? JC

Yes, its a good idea here is the location of the the fuel pressure regulator below. Check out the diagrams (Below). Please let us know what happens.

Cheers, Ken

Please Help!! hello and greetings,i have a 1988 nissan truck d21 4cly no a/c with manual trans and i want to replace all the vacuum lines but i have no schematic or diagram to go by. i am really low on $ so thats why i am useing the free option. i hope someone will help me with this as it has been a great truck.

can you see this OK? if not then give me your email and i will send it to you that way, you can then blow it up on your PC.

I have updated this post you can now see the diagram (BELOW)

thank you so much!!! and yes please send it to me as i cannot make much of it out...my e-mail address is [email protected] i will use your service again and i will donate next time...your help is really,really appreciated!!!!

no problem, i enlarged it the best i can and posted it below. i also emailed you the diagram as well, you can do more to it on your PC than I can here in the forums..

I have a 1989 Nissan pick SE. VG301 motor V6 2WD with 127,000 miles on it. I recently had to change the heads due to a timing issue which froze the valves up and I lost compression. Since the new heads have been on I have got poor poor gas mileage and heavy black soot in tailpipe, so thick its eaten a hole in the pipe. As driving I feel like a backpressure or surge when gas pedal is not depressed. I was unsure of vaccum lines and where to re attach them. Any suggestions as to what is causes the poor gas mileage and can anyone provide me with a detailed diagram of the vaccum system. Mainly the lines that go to the throttle body or intake?

Was the timing belt installed correctly?

This is the on;ly vacuum diagram available to me. sorry if it is fuzzy.

Its readable-KHLow2008-Could be a valve timing problem as you stated-

This could be a timing issue as you stated so I attached the process on how to install the timing belt and time the engine.

Also, if this is a vacuum leak issue, then here is a guide that will help with this:

https://youtu.be/4ktw1X4W_-k

Below is the process on how to time the engine. Let us know if you have questions. Thanks

Four cylinder two wheel drive manual 180,000 miles.

please help me. i bought a wonderful little truck to get back and forth to work with. everything on it is great except for the fact that all the vacuum lines have deteriorated or are missing.

does anyone have a vacuum diagram for y lil d21?

it has a 2.4l throttle body injected z24 motor.

Hello, I have found the vacuum diagrams for the engine and EVAp systems I hope this helps. (below)

(Click the image below) Please let us know if you need anything else to get the problem fixed. Cheers, Ken

lz help me i bo9ut a wonderful little truck to get back and forth to work with and everything on it is great except for the fact that all the vacum lines have deteriorated or are missing does anyone have a vacuum diagram for y lil d21 it has a 2.4l throttle body injected z24 motor someone already posted me a pic of the emissions control system but that is not what i need although i do thank them very much this is a picture of what i dont need i need the diagram that is *****strictly for the vacuum system*** on a 1987 nissan d21 truck with a throttle body injected 2.4L z24 non california emissions motor with a standard transmission

It is on a label under the hood when shipped from the factory, this is all that is available to me. for z24i 2.4 engine. Look close, vacuum and electric diagram in one...this is what is suppied by Nissan.

need a vacuum hose diagram to see if my hoses are connected correctly. The engine runs fine but seems sluggish.

Don't know which engine you have so here are both.

I recently purchased a 1987 nissan d21 pickup 2.4L, the engine was shot so i rebuilt it. The problem im having is that when i received the vehicle all the vacuum lines were a mess and most of them missing or disconnected. I have looked everywhere for a detailed vacuum diagram for this vehicle and have not yet been able to find it. I was hoping you guys could help. Thanks, Dyerpunk

here ya go! thanks for the donation

Thanks a lot guys, the diagram is exactly what i needed, everyone that i did find wasn't complete. Thanks Again.

your welcome.

thanks again for the donation.

I have a 89 nissan d 21 pick up I need a Vacuum diagram to check the routing of the existing lines any help thanks engine Z24 2.4

Here's both V6 and 4 cyl..