S1 Rb25 Weird Problem

[Kris..]

motor:

S1 RB25

Z32

bigger inj

power fc

splitfires

ect ect

car runs, idles drives perfect until about 5000rpm in any gear, same spot in the rev range each time it will just start running on one or two less cylinders, clutch in and free rev and it goes away and runs perfect again

the Power FC is brand new, was still doing it with the Nisstune the car came with

the Splitfires and spark plugs are brand new

car was put on the dyno and tuner suspected there was a missing earth somewhere in the loom, but has been checked over and theyre all there so im a bit stumped

any help would be appreciated

one thing I havent tested which i will tnight is if it still does it when cruising and getting the revs up on half throttle for examle

[Guilt-Toy]

use BCPR7ES spark plugs. if no difference then try gap them to 0.6 and report back

[Ben C34]

new tuner required. Why did you get rid of the nistune?

[wolverine]

^^wtf?

[Dose Pipe Sutututu]

maybe he's tuner didn't have the software license for it?

[Kris..]

previous owner put the power fc in just before i got the car and gave me the nistune with it

tuner is highly regarded on this site and Vic has nothing to do with his abilities

[Kris..]

use BCPR7ES spark plugs. if no difference then try gap them to 0.6 and report back

will do and report back, thanks

[Dose Pipe Sutututu]

will do and report back, thanks

I would go BCPR6ES, 7 is quite a cold plug for a moderately tuned car

[Kris..]

new symptoms

was running rough while driving, gave it a free rev and at 5k (wouldnt go past 5k) coughed and spluttered and then shut up, clutched out to start again and wouldnt start, pulled over, turned key and started was spinning but motor not cranking, left for 2mins, started up fine and ran fine again???????????????

[GTSBoy]

Have you looked for faulty sensor reports in the ECU? Might be something worth looking at.

[KiwiRS4T]

Did tuner report leaning out? Have you replaced the fuel pump - checked fuel pressure?

[Kris..]

car was taken to tuner by last owner so can only go off what he's told me

has fuel pressure guage on it and is at 40psi

havent looked for faults showing on ECU, what should i be looking for? ECU is Power FC

[GTSBoy]

Have you got laptop or commander for it?

[JZP]

Spark plugs (cracked) caused revving problem and wrong injector seals caused similar symptoms for me. Took ages to diagnose and lots of swearing.

[Kris..]

Have you got laptop or commander for it?

yup have the hand controller in the glove box

Spark plugs (cracked) caused revving problem and wrong injector seals caused similar symptoms for me. Took ages to diagnose and lots of swearing.

will check plugs, someone also suggested a vac leak, maybe good idea to put smoke machine through it? can rule out vac leak and injector seals at same time

[scotty nm35]

Pressure testing the intake would be a good idea, and check the vac lines to the fuel reg/map sensor if you are running one.

[GTSBoy]

Well, in that case, there's a sensor check function on the commander. Just find it and use it.

[Kris..]

Pressure testing the intake would be a good idea, and check the vac lines to the fuel reg/map sensor if you are running one.

shall try get the smoke machine on it on the weekend and yeh has Turbosmart FPR

Well, in that case, there's a sensor check function on the commander. Just find it and use it.

will do tonight, thanks for that

[Guilt-Toy]

dude, first just change the plugs.. and put 7's in it.. don't bother with 6's.

[Ben C34]

I have always run 7s no drama.