R33 Problems..

[batesr33]

Hi,

A mate of mine is having troubles with his R33.

As soon as it hits about 5500rpm it just stops accelerating and starts back firing. or if it doesnt back fire it just stops reving and stays @ 5500rpm...

We are certain that is not coil packs as we have had many coil pack issues before and this isnt the same.

The car had a Power FC, Z32 ADM and a 044.

The now has a Stock ECU, AFM and fuel pump.

Also today is the first time the car has been driven since August..

Any help appreciated!!

[linedup33]

try filling up with new petrol (if u havnt put new petrol in since aug)

try reseting the stock ecu n see if that does anything

[batesr33]

Nah its got new fuel and i reset the ecu

[Julz89]

since its beeen sittin for a while chek for a foul spark plug or even re gapp them?

[paulr33]

stock ecu and z32? that will not work

run the std AFM

[l0WRB]

he stats stock ecu and afm now being used.

[nizmonut]

nah if its running fine up to 5500 rpm it wont be plugs or fuel, if it was either of those it would be coughing and spluttering right through the rev range,

but will need a few questions answered before being able to tell what it is causing it, is the afm still ok, have you swapped it with that of another car?

is the car running standard boost. if it had a z32 on it was the setup outflowing the standard afm? if so take the boost back down to standard.

R33, variable timed yes, is the solenoid still operational that lets oil flow to the lifters?????

the ecu alters fuel values when the system is activated by the rpm, flooding perhaps and detonating violently?

if so unplug the O2 sensors and leave them off for the time being as the ecu would be compensating for the richness,

also unplug the ecu temp sensor, this will force the ecu to go into normal operation as if the engine had warmed up.

is the base timing correct, assuming it was running a aftermarket ecu, afm, etc was this altered at all?

[75coupe]

I had a problem sounding similar it turned out to be the coil pack loom had become as a bit dodgy.

[joeyjoejoejuniorshabadoo]

is it as simple as R&R?

[batesr33]

It seems to have lost alot of power throughout the hole power range. But hasnt lost any boost.

Also little puffs of black smoke seem to come out the rear so it couldnt be the fuel pump if its running rich??

Could it be the afm??

[l0WRB]

its called the factory ecu and r33's go like ass with them in lol

checked the timing?

Edited June 15, 2008 by l0WRB

[tridentt150v]

air filter? not likely, but....

[R31Nismoid]

It seems to have lost alot of power throughout the hole power range. But hasnt lost any boost.

Also little puffs of black smoke seem to come out the rear so it couldnt be the fuel pump if its running rich??

Could it be the afm??

Almost a thread a week on this these days… *sigh*

Your running increased boost on the stock ECU. Its therefore having a fit/hernia/spaz etc etc.

Back off the boost, car will return to normal as its closer to factory. RB25 ECU's don’t like much over standard boost pressue in many instances

[drpheel]

wow ... im getting the same thing ... il keep you updated if I find any info !

good luck

[boostin_r33]

maybe the coils?

[SKYYLINE]

if your car is not running factory boost gap your plugs to 0.7mm i use to have the same thing no power past 5000rpm new plugs fixed it

[KezR33]

It is a constant problem at the 5500rpm mark? My car is having similar issues, but its temperamental. Some days it drives great, other days its terrible, and of course whenever I take it to the mechanic it decides to have a good day, or half-week as it were last time.

In any case, next time it plays up I'm driving it straight to him. I'll post here on what he finds.

[SKYYLINE]

well electronics on skylines fail when they get hot so a guess its one of your coil packs comes and goes with heat

[GeeTR]

well electronics on skylines fail when they get hot so a guess its one of your coil packs comes and goes with heat

Best eva

[PWND]

I had similar issues, which turned out to be the knock sensor.

now i have a boost leak. i think. it's not in the piping, so gotta get the car on a dyno to find out where it's coming from