Hi there guys. I've now had my 2.0 16v X20XEV omega for 4 or 5 months and still can't get it to work. So far the EGR, coilpack, leads and plugs, airflow meter, idle valve, ecu chip and transponder, head gasket, inlet manifold, servo pipe, coolant temperature sensor and most of the vac pipes under the bonnet have all been changed as well as the complete exhaust system and a few other things.
the symptoms are a very rough idle, backfiring into the inlet manifold, inability to hold the revs at a steady speed and cutting out. It seems to run ok above about 2'500-3'000 rpm.
I did a compression test the other day just in case and got 180psi per cylinder. the plugs are sooty, but with white soot at the tips.
squirting easy start around the engine bay made the revs rise when sprayed in the vicinity of the servo pipe hence the replacement, but i have run out of the spray so haven't tried it since fitting the new one, although i coated all the joints with RTV as a back-up.
nothing sems to make any difference and i'm running out of things to change! (and money) I have had it plugged into a computer and didn't get any useful information. was told to replace the AFM and ICV and if that didn't work wire the ICV straightto the ECU, and if that didn't work to change the ECU. all of which i have done with absolutely no difference to the way the engine runs.
The injectors all give a strong fully atomised spray and all plugs spark.
Now question time:
If i pull the vac pipe off of the diaphragm bit of the coilpack should this do anything? it doesn't, so i'm wondering if maybe the diaphragm has burst and isn't advancing/retarding the ignition if that's what it does??
also if i pull the vac pipe off the fuel pressure regulator, should that make any difference? again it makes no difference.
been looking for a replacement engine, but can't seem to find any anymore. the used to be ten a penny, but the few that i have found are going for silly money. i still have the 20SEH, but i'm still not keen to fit it, more fuel, less power and it's done 240'000 miles already!
thanks in advance for any advice.