Jump to content
SAU Community

Recommended Posts

Hey people

I have got the rb25Det I put into my 31 running with everything connected including vct, afm, cooler... And it won't rev above 2400.....

I read it's most likely afm or tps... How can I check these?

It sounds like it's hitting a rev limiter.... Just before boost....

Any ideas?

Thanks

Link to comment
https://www.sau.com.au/forums/topic/312971-rb25-not-revving/
Share on other sites

Ok, well its in failsafe which is why it has a 2500ish rpm rev-limit...

Perform self diagnostic (will be a thread in DIY section if you don't know how) & check for codes.

If you have none try wiggling AFM plug & revving car to see if it suddenly revs higher.

If not try same with TPS. Did you do your own wiring conversion?

With no ECU LEDs & no dash light not really... Maybe a light can be hooked up directly?

Like use a pin-out to find which wire is check engine light & maybe it can be wired to a light/LED.

No idea if it would work but only thing I can think of...

hey people,

i have changed the AFM it fixed the limp mode problem straight away....

i have another problem though....

the engine is missing.

i though bad fuel at the start, cos its been sitting in the garage for about 2 months, on very low fuel, so i drove to the petrol station, added octane booster as well as premium, and let it run for a while. still missing on the way home, as soon as i pulled into the garage, it stopped missing, and was running sweet. so jumped back in to take it for a proper test drive, and it started missing straight away.

i have a 044 fuel pump and surge tank, and the pump makes some funny noises like its sucking in air, but surge tank is full... i have never run an 044 before so i am unsure whether noises are standard or pump is fu#ked.

i have changed plugs to NGK BKR5EIX-11

if i fiddle with the CAS and turn it completely anticlockwise, it sounds a tiny bit better....

also, when i back off throttle, the car almost stalls, sometimes does stall.

revs around 900 at idle

just trying to give as much detail as possible....

cheers people

Did you change plugs before or after replacing AFM?

If you done plugs, were in failsafe, then replaced AFM & now have a miss maybe you have just fouled plugs...

Car runs very rich in failsafe & for free worth cleaning & refitting plugs

it misses at idle and under load.....

plugs were changed before AFM was changed....

ill try narrow it down to a certain cylinder tomorrow, and take plugs out to see if fouled.....

car is running very rich at the moment, but probably cos one cylinder not firing?

it really cant be anything else besides coil pack or plugs can it?

cheers

hey again

ok, its cylinder 3 from the front of the block thats not firing.

when i unplug the coil pack, engine keeps missing just the same, if i unplug any of the others, it runs worse....

i swapped the coil pack with number 1, and still number three not working.

spark plug not firing.... so i swapped the plug with a new one, and still no go.....

oh, also, running pfr5g-11 plugs.

any ideas?

Thoroughly check your coilpack loom. If possible remove that section of loom (connects just behind head, maybe half a foot after cylinder 6 coilpack.

Then test the resistance/continuity of all wires from loom connector to coil plug. If 3 is dramatically different from the others I would hazard a guess you have a broken or damaged wire, etc Someone else may know of a more common problem but first thing I would check...

i checked resistance in coil pack wiring, and coild pack wiring is ok. so my problem is between the coil pack plug on engine loom, and the ECU.

as a easier fix, can i piggy back the earth wire from the other coil pack that fires at the same time as cylinder 3? or will this present problems at high revs?

cheers

please guys, i am desperate for help!

i dont know what is going on with my car.....

cylinder 3 is not firing at all. there is continuity in all wires to the coil pack loom from all plugs.

after testing wires, i determined that coil packs turn on via the earth connection in the plug....

the only way i can get cylinder 3 to spark is if i piggy back the earth wire from another coilpack onto the earth wire to cylinder 3 coil pack, but i am thinking none of the cylinders fire together cos it still misses.....

its not a faulty coil pack or spark plug.

it cant be injector related cos spark plug is wet when i pull it out

does any other cylinder fire at the same time as cylinder 3 from the front of the engine?

does anyone know the pin out on the ECU for cylinder 3 coil pack so i can trace continuity to ECU???

i HAVE SEARCHED AND SEARCHED, BUT NO ONE I CAN FIND HAS THIS PROBLEM....

what is going on?

just wanted to finish up this tread for anyone else who has teh same problem in the future....

problem was injector not firing, and as a fail safe, the ECU will not give signal to coil pack to spark if injector is not firing to prevent leaning out...

cheers

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

    • Who did you have do the installation? I actually know someone who is VERY familiar with the AVS gear. The main point of contact though would be your installer.   Where are you based in NZ?
    • Look, realistically, those are some fairly chunky connectors and wires so it is a reasonably fair bet that that loom was involved in the redirection of the fuel pump and/or ECU/ignition power for the immobiliser. It's also fair to be that the new immobiliser is essentially the same thing as the old one, and so it probably needs the same stuff done to make it do what it has to do. Given that you are talking about a car that no-one else here is familiar with (I mean your exact car) and an alarm that I've never heard of before and so probably not many others are familiar with, and that some wire monkey has been messing with it out of our sight, it seems reasonable that the wire monkey should be fixing this.
    • Wheel alignment immediately. Not "when I get around to it". And further to what Duncan said - you cannot just put camber arms on and shorten them. You will introduce bump steer far in excess of what the car had with stock arms. You need adjustable tension arms and they need to be shortened also. The simplest approach is to shorten them the same % as the stock ones. This will not be correct or optimal, but it will be better than any other guess. The correct way to set the lengths of both arms is to use a properly built/set up bump steer gauge and trial and error the adjustments until you hit the camber you need and want and have minimum bump steer in the range of motion that the wheel is expected to travel. And what Duncan said about toe is also very true. And you cannot change the camber arm without also affecting toe. So when you have adjustable arms on the back of a Skyline, the car either needs to go to a talented wheel aligner (not your local tyre shop dropout), or you need to be able to do this stuff yourself at home. Guess which approach I have taken? I have built my own gear for camber, toe and bump steer measurement and I do all this on the flattest bit of concrete I have, with some shims under the tyres on one side to level the car.
    • Thought I would get some advice from others on this situation.    Relevant info: R33 GTS25t Link G4x ECU Walbro 255LPH w/ OEM FP Relay (No relay mod) Scenario: I accidentally messed up my old AVS S5 (rev.1) at the start of the year and the cars been immobilised. Also the siren BBU has completely failed; so I decided to upgrade it.  I got a newer AVS S5 (rev.2?) installed on Friday. The guy removed the old one and its immobilisers. Tried to start it; the car cranks but doesnt start.  The new one was installed and all the alarm functions seem to be working as they should; still wouldn't start Went to bed; got up on Friday morning and decided to have a look into the no start problem. Found the car completely dead.  Charged the battery; plugged it back in and found the brake lights were stuck on.  Unplugging the brake pedal switch the lights turn off. Plug it back in and theyre stuck on again. I tested the switch (continuity test and resistance); all looks good (0-1kohm).  On talking to AVS; found its because of the rubber stopper on the brake pedal; sure enough the middle of it is missing so have ordered a new one. One of those wear items; which was confusing what was going on However when I try unplugging the STOP Light fuses (under the dash and under the hood) the brake light still stays on. Should those fuses not cut the brake light circuit?  I then checked the ECU; FP Speed Error.  Testing the pump again; I can hear the relay clicking every time I switch it to ON. I unplugged the pump and put the multimeter across the plug. No continuity; im seeing 0.6V (ECU signal?) and when it switches the relay I think its like 20mA or 200mA). Not seeing 12.4V / 7-9A. As far as I know; the Fuel Pump was wired through one of the immobiliser relays on the old alarm.  He pulled some thick gauged harness out with the old alarm wiring; which looks to me like it was to bridge connections into the immobilisers? Before it got immobilised it was running just fine.  Im at a loss to why the FP is getting no voltage; I thought maybe the FP was faulty (even though I havent even done 50km on the new pump) but no voltage at the harness plug.  Questions: Could it be he didnt reconnect the fuel pump when testing it after the old alarm removal (before installing the new alarm)?  Is this a case of bridging to the brake lights instead of the fuel pump circuit? It's a bit beyond me as I dont do a lot with electrical; so have tried my best to diagnose what I think seems to make sense.  Seeking advice if theres for sure an issue with the alarm install to get him back here; or if I do infact, need an auto electrician to diagnose it. 
    • Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
×
×
  • Create New...