Jump to content
SAU Community

Recommended Posts

Just for reference - the car is a 32 GTR, RB26 running PFC djetro

I'm pretty sure I know what the problem is (or do I?). I just wanna know if I can correct it easily.

So the story goes.......car runs perfectly, then after I changed to a "bling" clear timing belt cover > it stutters as soon as I hit the throttle - and then it revs as normal after that. So I assume I have done something to the CAS - despite being pretty careful putting it back on the way it came off :P

So am I right in assuming this is the problem and if so how can I correct it?

Is it something I can monitor on the hand controller and then adjust?

Yes I am a goose. Now that we are over that, can you help :)

Cheers.

Just for reference - the car is a 32 GTR, RB26 running PFC djetro

I'm pretty sure I know what the problem is (or do I?). I just wanna know if I can correct it easily.

So the story goes.......car runs perfectly, then after I changed to a "bling" clear timing belt cover > it stutters as soon as I hit the throttle - and then it revs as normal after that. So I assume I have done something to the CAS - despite being pretty careful putting it back on the way it came off :)

So am I right in assuming this is the problem and if so how can I correct it?

Is it something I can monitor on the hand controller and then adjust?

Yes I am a goose. Now that we are over that, can you help :P

Cheers.

Id be guessing CAS as thats really all u could have touched? is the base timing still corect?

You may need to test the CAS.

Unless somethig else went bung and it was just a coincidence.

If ur CAS is not dying and ur timming is correct, id take a stap and say the airflow sensor is stil ok but not reading correct voltages - prob dying. ????

Take it to a reputable workshop who works on a lot of skylines.

tmc_2: I am running MAP sensors that are like 3 months old at best. Is it possible that they would start to die this quickly?

Any other suggestions?

Lol the first post i knew u had a Map sensor but then foget :S , yeah checking airflow sensor for u is usless.

Has ot be some sort of CAS issue. What are all the things u had to take or or play wiht to install ur clear cover besides ur CAS?

I run a Wolf3d, also MAP sensor.

This is common and is easily fixed by the tunner. With the wolf there is an area of the map that compinsates for the off idle throttle response. If you have touched the CAS then it is a good idea to get your mechanic/tunner to check the timming, if the stutter is still there after they adjusted the CAS, then the tunner should be able to easily tune it out.

Just to clarify the problem:

Have the car in nuetral, then stab the throttle (only 1/2 throttle required), as the engine comes off idle there is a slight stutter.

Yep that's exactly the problem - I say I have put the timing out due to moving the cas. Need a timing light to bring it back to the original position correct? most likely 20 deg at idle.

Timing light, yes.

I think the R33 GTST's (like mine) are 15BTDC, and you could be right with 20 for your GTR. Check manual and then check timing. Rule that out first. =-]

Manual is useless.

If the dejetro is anything like the wolf, the ecu dictates the position of the CAS. Not too sure how it works but i know my mechanic fiddles with the CAS , using a timing light, after the car is idling and b4 the tune.

Hmm - you may have a point Al. I have set it back to 20 deg using a timing light and it is better but hasn't solved the problem completely. It was sitting way off - something like ~35 deg. Doesn't take alot of cas movement to be out 10-15 deg obviously.

At least the massive numbers on the knock sensor are gone though. When it was running like sh!t, I saw numbers up to 100 and this is while driving like a grandma. Knock is back to normal (like 10-20max) after testing it out today, giving it a little bit of stick.

Still not not happy with it. Although the remaining doubt may just be me being overly cautious and looking too hard for a problem.

Manual is useless.

If the dejetro is anything like the wolf, the ecu dictates the position of the CAS. Not too sure how it works but i know my mechanic fiddles with the CAS , using a timing light, after the car is idling and b4 the tune.

Forgot to mention, the adjustment of the CAS is for th "base" timing, the timing is then adjusted/controlled via the tunning of the ecu.

  • 2 months later...

Yeah I adjusted the timing back to 20deg and that all but eliminated the stutter.

Put it up on the dyno and checked everything to be sure. The tune is fine and still makes ~250rwkw consistently without any knock etc

But to answer your question - Yes does still happen when the car is cold. Once it's warm the stutter is gone - not ideal but I can live with it for now.

Thanks....

Curious.. Are you still running the std throttle body/cross over rubber joiner and IC pipe joiners?

I've just discovered my comp cover to IC pipe joiner is leaking slightly and it displayed the same characteristics as your problem. Pain in the arse when cold but ok when warm.

  • 2 weeks later...
Thanks....

Curious.. Are you still running the std throttle body/cross over rubber joiner and IC pipe joiners?

I've just discovered my comp cover to IC pipe joiner is leaking slightly and it displayed the same characteristics as your problem. Pain in the arse when cold but ok when warm.

Yeah, but he's running a djetro, so a leak in the piping will not effect the running like with an AFM

  • 2 weeks later...

hmmm, i had issues with my idle when i first got it, changed my oil and the problem seemed to go away but is now back again, im not sure if its the same problem or something similar. My car is as follows:

S1 R33 GTST

K&N panel filter

FMIC

Cat back exhaust

button clutch

i've got NGK irridium plugs, and have just done the filter and oil change (motul 8100 5w-40w), last week i changed my o2 sensor and now when the motor is cold it idles sweet, around 650rpm, but when its at op temp the idle drops to 500 then 350ish then goes between them in 4sec intervales. i touch the throttle when taking off at the lights and it stalls 2 out of 3 times, i pullup and BAM stall, , , WTF ? ! ?

im gonna clean my AAC and my AFM, i havent had it tuned since i got it (1 yr ago), so it could be that.

any ideas,

Aif

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...