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Matt
Matt, Mechanical Engineer
Category: UK Car
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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Skyline R33 GTST: Kenbam, have a number of performance

Customer Question

Hello Kenbam, have a number of performance issues with my R33 Skyline GTST
Submitted: 1 year ago.
Category: UK Car
Expert:  Matt replied 1 year ago.
Hello if the car is generally lacking in performance the 1st thing to check is the fuel pressureas if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine if the engine has been tuned then its possible the new calibration needs refinining or it may have created some issues by overboosting the engine so a compression test may be required to ensure all cylinders are within 10-15 psi of each other
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Customer: replied 1 year ago.
Hello Matt.Thank you for your reply. Ok here's some more information. Not sure if these are related or there is more than one issue.Firstly the engine is a stock RB25DET, no modifications. And its an automatic transmission.Its not a general performance problem, when the car goes, it goes well :)Intermittent poor acceleration which is a bit scary not knowing if I have the power to overtake.
Its okay if I take it steady and build up acceleration but from standstill or if I put my foot down hard I get boost on the gauge but there is no power there. I have to back off and accelerate smoothly, will rev to 5000+ if I go smoothly otherwise sticks about 2500 just wont give me anymore.
This problem has been getting worse and worse over the last few weeks. it feels like I've just got a normal car, the 'in your seat' acceleration has gone.I had full service done approx 6 months ago (including new spark plugs and fuel filter). I always try and use super unleaded when its available. Had previous issue with speedo cutting out when it got to 80. The kph/mph convertor was replaced and the speedo now drops back to 0 at 120, this has happened twice though obviously its hard for me to check this due to speed limits on British roads..
A specific incident happened last Saturday, don't know if this was a one off, or compounded by the original problem. After filling up with Tesco Momentum 99, got a good speed up then it went really lumpy, pulled into layby sounded like misfiring, thought I would have to come back home, let it run through for a while and seemed to clear think might have been dirt in fuel chamber / carberettor. That petrol pump at the garage might not have been used for a while ? Is fuel pump on the way out possibly ?I've been advised to take the car on the dyno (due to the speed issue) but I'd like to get the other bits fixed first. i don't mind spending money to get it working but don't want to throw money into it without anything being fixed.
In order of easy things to check / fix first and cost what is your advise please?Cheers, Kev.
Expert:  Matt replied 1 year ago.
Hello
thanks for the extra information
I'd agree that it sounds like the fuel pump is failing to me
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injectors and if this is low check the pump as described
Customer: replied 1 year ago.
Hi Matt, thank you.
Here is my latest update. Had engine mgmt light come on today. Pulled over and cancelled my trip. Started back home no power, couldn't get above 40mph and struggling uphill.
Pulled over again at a safe place and called AA.
Unable to connect to diagnostics as too old a car and import, but he found the lambda sensor plug wasn't fully home. Drove back 40+ miles at steady pace no hard acceleration without any further issues.
I will drive locally for a few days to see if this has fixed the problems (hopefully) and take to my Skyline specialist to see if he can retrieve the error codes from diagnostic reader. If I still have issues then I'll start looking at the fuel pump relay and fuel pump itself.
I will give you feedback because your help has been useful, just give me a few days.
Thanks, Kev
Expert:  Matt replied 1 year ago.
Hello Kev
if the lambda sensor was sending false readings then yes this could produce the issues
it might also be worth doing a 'hard' reset to clear any lodged readings from a faulty sensor
by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.
This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.
This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm
Expert:  Matt replied 1 year ago.
Hi
do you still need help?