Jump to content
SAU Community

Recommended Posts

A mate was moving my car off his front lawn, when he started it spluttered and stopped and now there is not a hint of it even wanting to fire.

I have checked my power fc sensor check and every thing looks fine, i changed the ignition module with no luck, the cas is showing 2-3 degree's when cranking and 0 if unplugged, have unplugged the tps, cas and afm with no difference but they all do should up as faulty in the sensor check screen, i can here the fuel pump prime but just to be sure i took the fuel line off and there is plenty of fuel flow.

From here i have no idea what to check next, any idea's would be great.

check for spark, check for fuel. If there is spark, and there is fuel coming to the rail, then check fuel pressure (pinch the return hose and see if that changes anything).

if u have spark, fuel, pressure, then put an LED/noid light on an injector plug and make sure uve got injector pulse.

if uve got everything, it should start and id be asking my mate what else he did other than moving it off the lawl :P

I know there is fuel there but not sure of pressure, i'll check that, as for what my mate did, he was as hung over as f**k and didnt even want to go out side so im sure he wasnt cutting hoops around the block lol, he wouldnt do it if he was sober.

  • 3 weeks later...

+1

Check spark and injector pulse

Check spark plugs

Check fuel pressure

Check timing belt

Check compression

in that order

I have checked everything except compression which im sure would not drop low enough on every cylinder that not 1 cylinder would fire and checking if the timing belt has slipped a tooth or two, the belt is still intact and tight.

Also tried a different ecu and once again not a hint of firing on any cylinder.

Any other suggestions?

Is the cas aligned with TDC compression stroke?

how do i check that?

I did replace the cas with another one i have here but its been sitting out in the car port for a while so im unsure if it works, the shaft has surface rust so im unsure what condition the internals would be in, it has not been in the rain tho.

Have you checked all the fuses, any major vacumn leaks? also you can take the CAS apart to check the shaft isnt broken..sounds like when my cas broke..

Edited by SliverS2

Yes but wen u penetrate the opening u have to have it aligned correctly....

Theres a keyway in the exhaust cam as the cas must be aligned with TDC compression stroke otherwise the ecu has an incorrect reference.

Hard to explain but pull the cas out and have a look in the centre if the shaft. Then look inside the opening. U should notice a key way which should stop the cas being inserted incorrectly but if the keyway is missing its a little harder to align

Have you checked all the fuses, any major vacumn leaks? also you can take the CAS apart to check the shaft isnt broken..

No vac leaks, but even if there was one the car would still atleast fire on a couple of cylinders, have not checked fuse's or relays tho, will do that when i get some light.

Yes but wen u penetrate the opening u have to have it aligned correctly....

Theres a keyway in the exhaust cam as the cas must be aligned with TDC compression stroke otherwise the ecu has an incorrect reference.

Hard to explain but pull the cas out and have a look in the centre if the shaft. Then look inside the opening. U should notice a key way which should stop the cas being inserted incorrectly but if the keyway is missing its a little harder to align

It is in properly then, had to fiddle with it before it would slide into the D shaped keyway, untill it did the cas would not slide all the way in.

I think your cas might be broken inside, its happened to me before and i wondered why the car wouldnt start , then when i took it apart i could see the shaft was broken..

I also decided to not use the front timing belt cover anymore cause i wasnt sure if it was stuffing up the alignment..

Edited by SliverS2
  • 2 weeks later...

For those with the same problem check the fuse marked "starter" dont assume that this is for the starter motor and dont bother checking because the starter is working fine, its actually for a "starting circuit" which is apparently separate from the ecu, and even if it looks fine change it any way.

Also after flattening the battery many times trying to start it you have probably screwed your plugs and cleaning them wont help so get a new set!

Lessons learnt :/

  • 4 weeks later...

So it was just a fuse? If so you must not have checked ignition/fuel correctly, as it will only cut one of those out.

Apparently The fuse reduces the injector pulse to a point where it wont get enough fuel to fire but still enough to show a pulse on a multi meter.

No idea why its there or even if that info is correct but it does explain why everything checked out fine but it really wasnt.

Wow that is annoying, we had a similar problem where the wrong earth had been used for the ignitor, it could sink enough current to spark, but the spark was really really weak and wouldn't actually fire.

Had to strip the loom apart to find the proper earth when we wired it up again, took ages to figure that one out.

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

    • I havent bought a manual cover for the dash yet and no cluster change, won't bother me too much, I just need to get that auto box gone, manual in! I miss my manual. 🤪. We started last weekend and managed to get the box out. Planning to start putting it in this weekend and then order a single piece tail. We were super careful to take time and not damage anything. It's my first time working under the car.  With my S15 mainly worked in the bay. This time, it was a headache because of three or four bolts only. They simply didnt want to leave thei homr and the one securing the tailshaft, another above the GB, and the one securing the lipstick was a shit. Mates mate, Davo caught fire 🤣, nearly opened his chest up with a grinder 🤦🏽‍♂️ and both mates nearly had a plate from the box land and slit their head open. Fun times. We all survived. Not the easiest working with limited access on jackstands. As I'm sure we can agree these are the memories which make us love our car. For all three of us, was an awesome weekend and Sunday 3.30am before tools down was a fantastic effort. I need to upload pics, but looks like it needs to be via Url now. We used to be able to just upload pics back in the day. It's been that long! 🤪 Im currently spraying rustoleum under body, not because it's rusted. It's super clean, but just so it's protected for the next 10 years. There was a few surface rust spots. Which pretty much wiped off with a 3M scourer.  Really impressed with how well the previous owner maintained it. Bank account went down so quick! Service, then GB - managed to get a spanking new 34 genuine box from Nissan. All the rest of the conversion parts from Kudos.  Went with a Nismo short shifter. New pedals and Exedy Clutch and FW. Ordered the Prp Rear Main Retainer kit which should arrive Friday and my first engine mod part just like I did with my S15 will be the Tomei Expreme Turbo Outlet. Already on order. It'll likely sleep next to me on a pillow during the coming months. 🥰 Last build was on my JET200GT profile and on SAU and Hardtuned I had documented the build. Planning to try to do that again. Brands feel scarce now. Wish we still had ARC and Apexi parts readily available. Exhaust - need some advice on this. I had an Apexi exhaust on the S15 and loved the tone. My mate had a HKS HP Silent on his 33 and suggested I go with that to avoid drone. I can't remember hearing an RB25DET running that so will likely need to wait for a meet or something to hear it.  Not after big power, just enjoy building it, and drivability with minimal negative attention.
    • Have a chat with Ben at Moore Performance or Jesse at JS Performance.
    • Thanks both. All good advice. Reminds me of drilling through stone wall for drainage pipe 😬 I'll let you know how I get on if I still have use of my hands afterwards 😅
    • Finally got shipping number for the intake and throttle body, shipped by UPS, so "should" be in my hands sometime next week, fingers fracking crossed
    • I'm so far behind in the jobs I have to do at both work and home (including car) that I have become immortal. There's simply no way that I can die now.
×
×
  • Create New...