Jump to content
SAU Community

Car Running On 5 Cyclinders Needhelp Asap!

gtst7

By gtst7,
in General Maintenance

 Share

Recommended Posts

gtst7 Community Regular

gtst7

Posted
Posted (edited)

hey I have a problem with my r32 gtst skyline... it's running on 5 cyclinders atm...

first I thought it was a coilpack that was stuffed but after changing it with another coilpack it didnt change anything. then I changed the spark plug but that didnt help either... the only thing I can think of now is the plug connected to the coilpack? could that be it? if so how do I change that plug?

any suggestion would be helpful

thanks

Edited by gtst7
QRI05E Mentor

QRI05E

Posted
Posted

Are there any other symptoms such as Smoke? Backfiring? Etc

Take it to a good mechanic and let him test the following:

1. Cylinder compression

2. Injector pulse

3. Coil pack harness

It’s a process of elimination from the smallest cause of the problem to the biggest… could be something real small causing this issue so don’t stress just yet…

Keep us posted

Regards,

Sarkis

mad082 Grand Master

mad082

Posted
Posted

when you say you changed it with another coilpack do you mean changed it with a spare coilpack? there is always a chance it was dead too. best way to check if it is the coilpack is to get another spark plug (a spare one that you know works) and 1 at a time pull the coilpacks out and plug the spare spark plug into it and get someone to start the car. make sure there is no light so that you can see if it sparking. this will both test the coilpacks and the spark plugs. if you disconnect 1 coilpack and it doesn't make it run any worse, but the plug sparks then you know its the plug. if it runs the same and the plug doesn't spark then you know its the coilpack. and to make sure it isn't the wiring harness plug swap it with another coilpack on the engine and see if it sparks from that spot. if you can put any coil onto that plug on the loom and it doesn't fire then you know its either the loom or the ignitor.... or possibly the ecu.

gtst7 Community Regular

gtst7

Posted
  • Author
Posted

well I'm 100% sure it's not a coil pack... all I can think of is that plug on top of the dead cyclinder is not working...

for example if cyclinder one aint working because of the coilpack plug... and I took the plug out of the coilpack 2 and shove it in the coil pack 1 should it work? cause I've tried doin that and the cyclinder still not working... so now I'm really not sure what's wrong

MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted (edited)

3 things to check...

1-check that it's sparking

2-Do a compression test

3-Check that the injector is firing. (never tried this on a skyline, but i've done it on other cars, you can hold a screwdriver against an injector, and listen through the handle end and you should be able to hear it firing... Might be a problem trying to do this on RB's because injectors are hard to get at due to the intake manifold.)

Edited by MerlinTheHapyPig
mad082 Grand Master

mad082

Posted
Posted
for example if cyclinder one aint working because of the coilpack plug... and I took the plug out of the coilpack 2 and shove it in the coil pack 1 should it work? cause I've tried doin that and the cyclinder still not working... so now I'm really not sure what's wrong

you are talking about the plug of the wiring loom, not the spark plug, right? no it won't work. it will make it fire at the completely wrong time. if it is number 2 that you think is not firing then swap the coil with number 1, then leave the coil that you put into number 1 unplugged. if it runs the same (dropping 1 cylinder) then you know its the coil. if it runs worse (dropping 2 cylinders) then try swapping number 1 and 2 spark plugs (so you now have the coil and the spark plug from 1 in 2, and 2 in 1). now start the car again. if it is only dropping 1 cylinder then you know its the spark plug. if its dropping 2 cylinders then you know its the wiring loom.

MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted
how do I check those things?

well all I know is in the dark u can see spark coming from the coilpack when I pull it out of the sparkplug...

first of all, determine which cylinder is out. This is done by unplugging the coil pack lead for each cylinder in turn and see if the engine revs change. If the engine revs don't change, then you just unplugged the cylinder that isn't working.

spark

-------

remove the coil pack, put a screwdriver end on the terminal, and hold the screwdriver near a bare metal part somewhere on the car, you should see a spark jump. Or alternatively, you can take out the spark plug, connect it to the coil pack, and it should spark (i think you may have ground the spark plug for it to work)

compression

--------------

buy a compression tester gauge. Or borrow one

with engine at operating temp....

-start car

-unplug fuel pump (plug in boot of car), let car die. This disables fuel pump & re-leaves fuel pressure

-remove all 6 spark plugs and coil packs & crossover pipe, cover etc.

-for each cylinder

- screw in comp tester (make sure you get the ones with the rubber hose on them)

- crank engine 7 or 8 times with throttle to the floor

- record reading

if compression is less than 127psi, or there is a variance of more than 10-15psi (pay particular interest to the cylinder is not running), this indicates comp problems. Do the test again, but add 10ml of oil to each cylinder. Record the results for both tests, and post them up on the forum.

Low compression is bad, it indicates internal engine problems.

fuel

----

Never done this on skylines, but you can try it. Hold a screwdriver against the fuel injector for the cylinder that isn't running, listen through the handle, see if you can hear the injector firing. Compare what you hear to another injector.

Injectors on skylines are hard to get at, because the manifold loops around the fuel rail.

Anyway, if a cylinder isn't running, there are only 3 general causes... Fuel, Spark or Compression. These are the 3 things a motor needs to run.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • TurboTapin
      boost source Size Garrett gt28 gen2

      By TurboTapin · Posted

      You just need to remove the compressor housing, not the entire turbo. I would not be drilling and tapping anything with the housing still on anyways. 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • QB6SAGR
      Battle of the broken skylines

      By QB6SAGR · Posted

      Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
    • cosline
      R32 gtr transmission strength, billet plate

      By cosline · Posted

      Hi, I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset? At what power level and use did yours brake with or without billet plate? Thanks, Oystein Lovik
    • Rezz
      Spotted on the street....

      By Rezz · Posted

      Saw this replica police car based on a Mitsubishi Starion XX parked next to a 'police box' (it's literally a box) in Hirohata, Himeji City in Hyogo prefecture the other day. It's owned by Morii-san who is a local Mitsubishi Starion enthusiast. According to a local radio station blog post, he always wanted to make a police car himself based on ones he saw in his favourite Manga comics.  As it's illegal to modify a car to look like a police car and drive on the road, Morii-san tried many times to get permission from Aboshi police station headquarters nearby. They refused initially by after they got tired of that they granted him permission. However, the car can only be displayed on private property and obviously can't be registered as long as the police livery is present. The car was completed at a cost of 1.5 million yen (US$ 10,000) in addition to the car cost. A location was chosen outside Hirohata Police box where the car can easily been seen from the street. Morii-san has two other Starion road cars, both widebody GSR-VRs.
×
×
  • Create New...