Leightonm1969

After a new denso lambda sensor the engine light has gone off, new plugs, fuel filter and air filter!
I still have little flat spots before boost!
Engine light flashes sometimes as misfire fault.
Coil pack maybe? if so trial and error?
Please help thanks

JDM_Stig

iTrader: (3)

what is the error code ?

Leightonm1969

No error code now only flashing now and again say if I blast up slip road to join motor way.
Managed to catch it before it whent off
"Engine misfire" it read


Old codes were
0031
1131
Which have gone now!

JDM_Stig

iTrader: (3)

if u have a flash and no code thats typically a NPS (neutral Position Switch),
on a standard ECU, some aftermarket ECU`s use the CEL to warn you of knock.

Leightonm1969

Knock as in bearings gone?

Turbotits

iTrader: (2)

No, knock as in det. Only after market ecu's though. As above. Standard ecu the nps is worth looking at or changing.

Leightonm1969

Thanks for your time where is the nps located?
Also iv put V power fuel in with a octain booster and its fine!
Also it used to sound as if its pinking!
A nps should sort out that?

YoungY25

iTrader: (5)

The NPS could well be faulty, but it wont affect the running of the car unless its an STi with the AVCS heads. It will throw up phantom missfire codes tho so its worth changing tbh. Its located on the top of the gearbox on the nearside iirc.

You've changed alot of the usual suspects already apart from the coils. Does the stuttering follow any sort of pattern? Or is it random? Could be the knock sensor playing up advancing and retarding the timing. They can fail and play havoc with the ECU. Mine failed and didnt throw any codes or CEL lights at all.

Leightonm1969

Going up hill in 4th between 2500 and 4000rpm!
Then boost is really good!