burbling1

iTrader: (1)

I have a misfire when on wot between 4500 and 5000rpm, it pulls fine to 4500 then has a little cough and a fart and then at 5000 its a way again to the redline.
Just changed lambda sensor and going to change plugs tomorrow, anybody got any other ideas?
Thanks..

Scooby_Doo_88

hey i have the same problem with my 95 impreza wagon 2.0 non turbo. got to bout 4 and it starts to misfire and hold back up to the redline. wat cud this prolblen be.

burbling1

iTrader: (1)

I would try your plugs and coil packs as yours does it all the way to the redline were mine clears itself after 5k

Jolly Green Monster

iTrader: (4)

does the speedo work?

burbling1

iTrader: (1)

yes. But since you mentioned that about 3 months ago it wouldnt rev above 4500 it turned out to be fault 32 which is speed sensor. I reset the ecu and has been fine since. Would it clear again after 5k rpm if it was a fault on that? Thanks for you reply.

burbling1

iTrader: (1)

yes. But since you mentioned that about 3 months ago it wouldnt rev above 4500 it turned out to be fault 32 which is speed sensor. I reset the ecu and has been fine since. Would it clear again after 5k rpm if it was a fault on that? Thanks for you reply.

MrNoisy

iTrader: (28)

I had the same problem mate - MAF was fine, coil packs were fine - changed my plugs and problem seems sorted.

burbling1

iTrader: (1)

Im going to change my plugs tonight and put 7s in instead of 6s. Just seems weird that it only does it for 500 revs. Think there must be a change in the map at about them revs because before it seemed to pull really hard then. Thanks again.

burbling1

iTrader: (1)

Put the new plugs in tonight and all seems well, fingers crossed

MrNoisy

iTrader: (28)

Good to hear fella

burbling1

iTrader: (1)

Its back, now I dont know wether this helps or has anything to do with it but it seems to do it more when its really cold, am 99% sure its not the fuel cut due to overboost but I notice that when it misses the rev counter seems to drop a couple of hundred revs although the engine revs dont drop. I may be wrong but this tells me that its something killing the ignition.
What do you think?

mit

iTrader: (10)

The coil packs can break down causing this problem. Also, did you re-gap the plugs, as a smaller gap helps when running higher boost.
I had the same problem after a re-map to 1.35 bar, the spark can be blown out by the increased boost, the smaller gap cured this for me

Mit

burbling1

iTrader: (1)

Hi, no I didnt re-gap the plugs, it said on the box that they were preset and altering them could cause damage.


I checked the fault codes tonight and found,

23 mass air flow sensor.
45 Pressure sensor / Pressure exchange solenoid valve.

What is the pressure sensor?