Jump to content
SAU Community

Recommended Posts

Hi guys,

Have done some research on SAU and online but haven't come up with a definitive answer yet.

Car details: bog stock except turbo back exhaust, aftermarket bov, turbosmart boost tee @ 8 psi, brand new yellow jackets,

Milliseconds after hitting boost it feels like I've hit a brick wall (like foot is off the accelerator when it physically isn't). I'll try to accelerate again but instead it's an intermittent violent herky jerky motion as if I'm repeatedly on and off the accelerator. If I attempt to smoothly apply throttle without boost it may pick up again. Sometimes I will come to a stop and car will stall. While car is decelerating I can see the boost guage fluctuate according to the pressure I'm applying to the accelerator. Though not as pronounced, the engine sometimes will also cut out intermittently after a warm start on idle and stall...doesn't happen on a cold start. The other night also had trouble starting the engine from warm. It would crank fine but would only fire for a second then stall. Tried starting repeatedly and got it to idle fine after about half an hour of attempting.

Thought it could've been coilpacks so I got brand new ones along with plugs and dropped them in but same issue.

I've recently cleaned the AAC valve and AFM in the past month.

I've read that it could be the cam/crank angle sensor? Possible timing issue - RnR? Fuel cutting?

Any advice appreciated. Thanks.

Link to comment
https://www.sau.com.au/forums/topic/464480-rb25det-intermittent-power-loss/
Share on other sites

Coils were the obvious choice. Next most obvious is a dodgy solder point on the AFM. You might be able to fix that yourself. Have a search for howtos.

Faling CAS is possible, but doesn't often give the symptoms you report. Failing fuel pump could.

It is not R&R unless someone has advanced your CAS all the way.

Thanks for the responses. Last time I cleaned the AFM I had a look at the soldering on the joints and it seemed fine. Maybe the actual measuring element is playing up.

Will be trying another AFM. Is the R34 AFM interchangable with the S2 ECR33? The part number for the S2 ECR33 AFM is 22680-31U05 and the website says it is compatible with R34 as well (http://www.rhdjapan.com/nissan-oem-maf-mass-air-flow.html). However I'm looking to buy an AFM with the part number 22680-31U00 since it is cheaper..I'm thinking this is the R34 GTT one. Can anyone confirm before I hit the buy button?

just to be sure, when you say 8psi, that is on an aftermarket boost gauge right? and not the stock gauge. Stock one is not psi.

If you cant boost properly how do you know its set at 8?

Was it all working fine then suddenly one day this started? or Did it gradually get worse over time?

what was the last thing you did before this happened?

  • Like 1

Yep 8psi as seen on an aftermarket boost gauge. I've since had to remove it due to it being a defect but when I had it on it did read 8 at WOT.

Prior to the issue the car was running fine and it read 8 psi.

Just happened suddenly. I remember first time I experienced it.. I was at a red light and gave it a decent launch and the car got all herky jerky on me. Didn't know what it was but I cleaned the afm with CRC but didn't resolve the issue. It has since gotten worse over time. I don't remember doing anything major prior to the start of the problem.

Also, just as a precaution I checked the coil packs and plugs. I found one of the coil packs didn't have a spring in it as seen through the hole which sits on the plug. I thought this was the problem. Spark plugs didn't look to have any abnormal wear. So I bought brand new YJs but issue still persists.

The reason I went with YJs is for the post sale support.

I have only ever heard bad things about their post sale support, but if thats what you want.... Would be nice if you can report back with positive feedback on the YJ's eventually though.

try replacing the afm ( borrow before buy :) ), double check all piping and connections, remove boost T and just run wastgeate actuator pressure.

Just starting with the basics and cheap options. hope you find the problem soon.

Not too sure how this turned into a flaming thread.. Didn't ask for anyone's opinion on the coil packs I bought.

Anyway I got a working afm and it has seemed to fix the problem. Thanks to the guys who provided feedback about my problem.

  • Like 1

Hopefully when your coil packs die they're still in the warranty period so you get a brand new set (brand name clearly not mentioned, so vendors don't has a sads).

I had two coils die out of warranty, bought two new ones. Kept missing firing gave up, bought Splitfire coil packs and they're still running like a cut snake till this day, even with added dwell because I live life on the edge.

#keepdosing

  • Like 2

Hopefully when your coil packs die they're still in the warranty period so you get a brand new set (brand name clearly not mentioned, so vendors don't has a sads).

I had two coils die out of warranty, bought two new ones. Kept missing firing gave up, bought Splitfire coil packs and they're still running like a cut snake till this day, even with added dwell because I live life on the edge.

#keepdosing

Ffs u blokes r all missing the point here. Who gives a shit what brand coils he bought. A dose pipe will cure all misfire issues. That is my new recommendation for these type of threads. Should of bought a dose pipe.That is all.

Ffs u blokes r all missing the point here. Who gives a shit what brand coils he bought. A dose pipe will cure all misfire issues. That is my new recommendation for these type of threads. Should of bought a dose pipe.That is all.

Ahh very true, excuse my ignorance and lack of knowledge.

Yes a dose pipe will fix the issue and introduce good backfires on deceleration like a bawse!

Suuuuuutututu pop flame brap lol

  • Like 1

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

    • Dear folks My family members have 4 different cars : Triton 2015 and Corolla 2011 and Mazda3 2012 and Hyundai Elantra 2014 Looking to buy engine oil funnel spill free What I found are are below  https://www.amazon.com/gp/aw/d/B0BBTTJNKX?ref=ppx_pt2_mob_b_prod_image&th=1 https://www.ebay.com.au/itm/145553221359?srsltid=AfmBOoqYBU6Ptw0LU_bAp_k67U3qkF97HHvePkA7iHZw8vUmiwoIRaRr https://www.amazon.com/gp/product/B09X23TCS5?th=1 Is there a funnel with attachment that fits most cars ? Don't mind to spend for a decent quality  Thx  
    • Stock ECU (or more accurately stock tune) absolutely refuses to go over 10psi and behaves like you have seen. The Nistune is the same if it is the stock tune. If the Nistune chip has been tuned, the resulting tune could be literally anything for any combination of parts. The Nistune just makes the stock ECU Tunable.
    • So stock ECU does not like anything above 10 psi?  That Nistune one is just for "try" if it will be any different, I know it need to be tune for that. I know but YOU may know about these problem but i/we dont. They few little Skylines here let alone people who know anything about tham so that is why iam asking here  
    • So now we have a radiator with no attachments whatsoever. It lifts up with a particularly tight spot between the drivers side air box mount and the lower radiator outlet, but if you've got this far you will sort that too. This is the lower mounts with the rad out so you can see where the rubber bushes go, it is a straight shot upwards Done! Assembly is the reverse of disassembly, with blood less likely to be shed.
    • Right, onto the second last trick. The Air Con condenser is mounted to the front of the radiator and stays in the car when the radiator is removed. There are 2x 10mm headed self tappers holding the top of the condenser to the radiator, remove those The bottom of the condenser is attached to the radiator with clips. You need to lift the condenser out of those clips and clear (up, then forward). f**ked if  could work out how to do that last bit with the front bumper on. I hope you can, and you share the trick.  Bumper removal probably deserves its own thread one day once I've recovered the will to live, but basically you need to remove the wheels, front inner guard liners (clips and 10mm headed bolts), the self tapper between the guard and the bumper at the rearmost point of the bumper (same as an R32 that bit), any remaining clips at the top/front of the grill, an absolute bastard design with a plate that holds the top of the bumper above the headlight each side (only 1 bolt which is tricky to get to, but the plate catches 2 places on the bumper and must be removed....carefully!) and push clips between the bumper and guard under the headlight. If you've done all that you will be faced with wiring for the fog lights on both sides and in ADM Q50 RS at least, 4 nasty tight plugs on the driver's side for the ADAS stuff. So, the clips at the bottom look like this on drivers side (looking from the front) And on the passenger side (also from the front), you can see this one is already out Clearance on both of these are super tight; the condenser needs to move up but the upper rad support mount prevents that, and the radiator can't move down far because it is (rubber) mounted. Once you achieve the impossible and drop the condenser off those mounts so it does not stop the rad moving, you are good to go
×
×
  • Create New...