Jump to content
SAU Community

Recommended Posts

Got my car back this afternoon from the mechanic. He didnt change the afm, basically gave it a check over, put it on the dyno, drove it round on the road a bit and said he couldnt fault it. Got it back on the highway and within 5 mins i had created a traffic jam! The problem is very easy to instigate, if i drive it gently and not on boost, all seems ok, if i give it some, say 1/2 bar or more, after i stop accelerating it basically looses all power, splutters, shudders i get very little response form the accelerator (if any) and if i fully remove my foot from the gas it will stall but i can keep it alive by pumping the accelerator, eventally it springs back into life as if nothing happeded. If i accelerate hard again same thing happens. Any ideas??

Cheers

Twitchy,

Sounds similar to a problem I had (and which we eventually fixed). Car would run like a dream and then, for no apparent reason, loose all power, survive a complete stall by pumping the accelerator, then after about 15-20 seconds, it would come good again and off we go. Kept happening at the most inappropriate times.

Same deal, we thought AFM, replace both (paid about $150 each second hand). No good. Changed fuel pump, checked wiring, relays, computer, CAS, spark advancer - basically everything you could think of. Mechanic would say - "I think we've got it now" after they road and dyno test - only to do it again on the way back to work.

ANYWAY... turned out to be the plug to the computer. It has a single bolt on the centre of the plug. As the car accelerates or brakes, the plug would rock - ever so slightly - and lose connection with the fuel pump pins. Used a bunch of zip ties to hold the plug firm on the edges - never had a problem since.

It's a long shot - but if it is the cause - you may not have thought to look at it.

Hope you get it fixed soon.

Cheers

Peter

ANYWAY... turned out to be the plug to the computer. It has a single bolt on the centre of the plug. As the car accelerates or brakes, the plug would rock - ever so slightly - and lose connection with the fuel pump pins.

Hi Peter;

that's a beauty, how did you manage to find it?

GTR 32,

I think it was when they were changing over the ECU (from Apexi back to stock back to Apexi) when they noticed the plug - which is actually more like a bar had a slight bow in it. I would have been stuffed otherwise - it had taken 3 weeks of trial and error, calling in auto electricians, 2 fuel pumps, etc, etc, etc when someone came across this.

At one stage, whilst at the mechanics, we couldn't start the car. Put a pressure gauge onto the fuel line and had zero pressure. Everyone stuffed around trying to work out why - no go. One of the guys leant up against the car - hey presto, full pressure.

Was driving us nuts.

Definitly worth a check if you experience any wierd stalling as described.

G'day Peter, very interesting reading your reply, sounds almost identical to my problem. I havnt heard back from the mechanic since i gave the car back to him last week (wednesday) so i gather he hasnt fixed it. First thing tomorrow i will ring him and let him know about your problem and solution. I have a feeling that it is an electrics problem due to some other strange things (electrical) that have happened in the past...he's not so sure though. I really appreciate your advice and will be sure to let you know the out come.

Cheers

Andrew

I didnt realise how lost i would feel without my car :rofl: i usually walk around with a big grin on my face, however since that fateful day last week i seemed to have lost such an expression :) (never thought i would feel like this about a car).

Edited by Twitchy
  • 2 weeks later...

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

    • HFM BM57 has a "bad" knee point, IIRC. It's not the same thing as the later R chassis MC.
    • The ATTESSA is functionally identical to R34; there were a bunch of JDM models that continued ATTESSA including Fuga/Q70, Skyline/Q50, Cima etc as an option. All with Auto only and I think mostly for snow regions. AFAIK there were no AWD VR30DDTT sold in Australia - it is on my to do list to check regs for racing a LHD car in Targa/ATR/AASA/CAMS events because if I can get the auto to work it would be interesting to run a 4wd car The Ecuteck TCM tuning is the same model as their ECU tuning, they already have it for R35 and Dose's favourite, BMW. You buy "points" to allow your computer to be tuned, buy either a bluetooth (phone app) or bluetooth+USB+Key (phone and PC) dongle, and pay for a tune that will be locked to your tuner ( ). You can also access the tuning software yourself but 1. it is mega expensive and 2. these computers have a billion parameters that intersect, so how could you ever spend enough time on it to get a decent result.
    • Or, is it a case of what it is like owning an R series Skyline? NFI what the previous owner has done or fiddled with... Ha ha ha After reading through this thread, I went on a bit of a research about the Q50/Q60. Now I'm quite intrigued by them! Is the AWD in them more like a WRX where it's always AWD, or is it more like the ATTESSA in the GTRs? By the sound of this TCU tuning, this sounds like a case of someone has made some real software for it, and you just need the right piece of hardware, and then you license that specific vehicle/TCU. Or is this a case of the software will be really expensive so only a few tuners have it, and you still have to pay a license per vehicle?
    • By popular demand.. it was a coil. Got my hands on 1 new OEM coil, replaced with the one that made the less noise difference when I unplugged it while the car was running and started the car up. No stutter and the engine light was gone. I guess I’ll buy the other 5 they have lol
    • No, code 21 is very straightforward. It can only be the things described in that diagnostic flow. In fact it has no way of knowing that the spark plug resistance is out of spec.
×
×
  • Create New...