Surging Under Accelleration

CPOCSM · Post by **CPOCSM** » Sat Oct 25, 2008 9:21 pm

Gday all ye wiley in the ways of L Series.

I am writing for some advice. I have put up with it and it is finally giving me the poo poo's. When accellerating the L series is sometimes surging, a bit like it is hunting for revs...if I keep going up in revs, it seems to iron itself out but it is really starting to annoy me.

The car is a MPFI Touring Wagon - I have replaced the fuel filter and the leads. Can the one or all the following be the culprit:

a: Fuel Pump(Bosch 65psi hi vol - about 100k kms)
b: O2 sensor
c: Fuel injectors
d: Other!!

Any advice would be greatly appreciated. I reckon it is the fuel injectors personally - I dumped a tank of Vortex 95 in the tank with some flashlube to see if it will make a difference.

Hooroo

Rob

rob83ke70 · Post by **rob83ke70** » Sat Oct 25, 2008 11:26 pm

to make it surge it has to be over advanced timing or lean air fuel mixture, and i would speculate that you have a problem with an oxygen sensor or coolant temp sensor is dodgy.

you haven't got any sources of unmetered air ie vacuum leaks?

rob83ke70 · Post by **rob83ke70** » Sat Oct 25, 2008 11:31 pm

more likely to be o2 sensor problem than blocked injectors. wouldn't be a fuel pump, if you take it for a good flog and it cuts an dies the worse you flog it then its a fuel pump...

Gannon · Post by **Gannon** » Sun Oct 26, 2008 6:43 am

Have you checked for codes?

Have a look here How to check EA82 MPFI ECU codes

INEEDABEER · Post by **INEEDABEER** » Sun Oct 26, 2008 7:16 am

Also water in the fuel can cause a surge.

CPOCSM · Post by **CPOCSM** » Mon Oct 27, 2008 6:23 am

Suparoo wrote:Have you checked for codes?

Have a look here How to check EA82 MPFI ECU codes

Yepp codes are all sweet and I will pull the tank access off to check for water although I think it probably might be the O2 sensor - it looks very ordinary and I suspect it is the original one....

Any idea as to cost and where to get them? I saw an ad in Just Parts for O2 sensors but no prices...may have to go OEM and hit Subaru in Phillip up.

With the fuel injectors, is there another brand I can use other than the standard replacements? They are bloody expensive little sausages!!!

Hooroo and thanks for the help!!:)

Gannon · Post by **Gannon** » Mon Oct 27, 2008 7:31 pm

Get your fuel injectors serviced, costs about $25 each

As for your o2 sensor, you can get universal ones off ebay for cheap, and they do the job

I bought one of these OXYGEN-SENSOR-O2-SENSOR-SINGLE-WIRE-UNIVERSAL and it works great.

YouTube · Post by **El_Freddo** » Tue Oct 28, 2008 3:08 pm

I get the generic oxy sensor from my local parts joint - the last one cost about $70.

Cheers

Bennie