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

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...