Weird problem.Need help

[msammut]

Ok GTR owners and experts. I am new the forum and have had my R32 GTR for about 2 months.

While on a long (1hr) drive I noticed on acceleration I had almost no power. The car surges and I can her the recirculation valves cycling opening and closing while accelerating. Also noticed sometimes the Hicas light flickers on and off.

Car details:

1993 RB26 GTR 5 speed manual.

Stock except for

Aftermarket radiator

Dual stage Turbosmart boost controller (set to 10psi).

Diagnosis so far.

Replaced PTU (upgraded -yellow jacket) - No change.

Checked Timing (22 deg BTDC).

Replaced sparkplugs - no change.

 

Anyone out there had similar problem and solution?

About to check fuel pressure.

I suspect ECCS or Fuel pump controller. I do not want to throw money at the problem without a proper diagnosis.

Thanks for any assistance.

Michael.

 

[KiwiRS4T]

Need a better description. Are you making any boost?

[msammut]

Sorry.

Yes. 10PSI and holds.

Also when power is lost the car gurgles at low speed on deceleration and seems to backfire at high speed (100kmh) decelerations.

Michael.

[niZmO_Man]

Might be a combination of AFMs (try resoldering) and dying alternator.

[msammut]

Thanks Ravi.

I will check voltages of AFM when cold and try to check when hot.

the Voltmeter is reading  a steady 14V. So I cannot see it being a voltage or charging issue but I wil keep an eye on it.

Changed the fuel filter today then drove 300km in the car. Did 100 Km with no problem the other 200 km with the problem. No acceleleration, missing and surging with boost fluctuation but not overboost.

Remember all is well when cold but after an hour of driving the problem occurs.

Michael.

Edited July 31, 2016 by msammut
spelling

[msammut]

Well I think I found the problem. While checking fuel pressure i moved the wiring to the injector connectors and got a change on no 6 injector wiring. On closer inspection the injector plug was half off. I pushed it in all the way. Now there is no change when wiring is moved.

Need to drive it to check but i think this was the problem.

Fuel pressure idling and under load was in spec anyway.

Michael.

[msammut]

Well I think I found the problem. While checking fuel pressure i moved the wiring to the injector connectors and got a change on no 6 injector wiring. On closer inspection the injector plug was half off. I pushed it in all the way. Now there is no change when wiring is moved.

Need to drive it to check but i think this was the problem.

Fuel pressure idling and under load was in spec anyway.

Michael.