Jump to content
SAU Community

Recommended Posts

So i just changed my sparkplugs on my r34 everything was fine I drove it for like 10 minutes and then the engine light came on and then it started misfiring really bad, now on idle, it sounds like its running on fewer cylinders. I got engine fault code 21

moved to general maintenance.

and.....have you checked everything since the drive? all plugs tight, all coil packs securely bolted down, all coil pack loom plugged in OK? And the coil pack earth if you undid it?

Or the plugs in there before were gapped very small, and now new plugs have a larger gap.

Or old plugs were gapped stupid small on purpose to mask any coil pack issues. If the coil pack's colour is on the left hand side of the colour spectrum then there's part of your problem.

You'll find coil packs in the following colours, ie the left hand side of the colour spectrum are 9/10 the root of your problem(s) with a car that is running more than stock boost.

Red Orange Yellow Green? (Eventually) lol.

Anyone remember ROYGBIV? 

3 hours ago, Dose Pipe Sutututu said:

You'll find coil packs in the following colours, ie the left hand side of the colour spectrum are 9/10 the root of your problem(s) with a car that is running more than stock boost.

Red Orange Yellow Green? (Eventually) lol.

Anyone remember ROYGBIV? 

I forgot to mention my car is non turbo 

what coilpacks you running Anal? I've got some OEM ones if you need, $20ea.

I'd do the following diagnosis

Remove 1 coilpack and start the car and see if the miss gets worse, if the miss gets worse then you know that coilpack / plug is working as it should be for that cylinder, repeat this for all cylinders and you should find out which cylinder is not firing. Once this happens swap a known good coilpack onto this to determine if its the coilpack at fault or something else..

 

Report back findings!

Edited by Dylannn
5 hours ago, Dylannn said:

what coilpacks you running Anal? I've got some OEM ones if you need, $20ea.

I'd do the following diagnosis

Remove 1 coilpack and start the car and see if the miss gets worse, if the miss gets worse then you know that coilpack / plug is working as it should be for that cylinder, repeat this for all cylinders and you should find out which cylinder is not firing. Once this happens swap a known good coilpack onto this to determine if its the coilpack at fault or something else..

 

Report back findings!

Thank you I'll do the testing as soon as I can 

5 hours ago, Dylannn said:

what coilpacks you running Anal? I've got some OEM ones if you need, $20ea.

I'd do the following diagnosis

Remove 1 coilpack and start the car and see if the miss gets worse, if the miss gets worse then you know that coilpack / plug is working as it should be for that cylinder, repeat this for all cylinders and you should find out which cylinder is not firing. Once this happens swap a known good coilpack onto this to determine if its the coilpack at fault or something else..

 

Report back findings!

so i started my car and it ran fine and again after driving and warming up the engine the engine light came on after about 10 mins. then it slowly started getting misfires as i kept driving the car. could i have put a vacuum hose in the wrong place

 

32 minutes ago, AnalStick said:

so i started my car and it ran fine and again after driving and warming up the engine the engine light came on after about 10 mins. then it slowly started getting misfires as i kept driving the car. could i have put a vacuum hose in the wrong place

Check codes on ECU, that will point you in the right direction from here

12 minutes ago, AnalStick said:

i did a code check and i got code 21 which means ignition signal, its very vague 

I’d try diagnosis outlined above and see if that helps finding what’s causing the issue

Check and make sure your pigtails on your injectors are good. Just push em in, unplug em, clean em and add some dialectic grease. 

I had a misfire and after changing coils, plug, harness and ignitor box i ended up jiggling the injector plug on the cylinder that was misfiring and issue was resolved.  

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


  • Similar Content

  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...