c20xe miss fire?

[reecegsi]

Hello

i have searched and searched but i cant seem to find the awnser

i have a xe in a corsa with no fault codes showing but its running lumpy and has missfire when there is load on it but if i rev gently it seems to be better? Cuts out every now and then aswell i would say when warmed up its a bit better? I have done

changed cts
cleaned icv overnight in carb cleaner (made a difference but still didnt fix problem)
Unplugged tps and it revs up plug back in and it drops so i would say that works?
Unplug afm it cuts out so that works
new plugs and leads a month ago (couldnt be broke already?)
also changed relay to a new one (no difference)

What else could it be?

Any help much appreciated as im baffled

[Melv]

What injectors are you running?

Have you removed the plugs and inspected them?

[vectra640]

sounds like an intermittent fuel pump as mine did the same till i changed it

[reecegsi]

What injectors are you running?

Have you removed the plugs and inspected them?

yellows with a 3.0 bar fpr as i dont have a 2.5 one and no not yet mate tomorrows job that is

[reecegsi]

sounds like an intermittent fuel pump as mine did the same till i changed it

i changed pump because i thought the one in it was buggered but ive got two so mite put other one in and see what happens?

[vectra640]

i thought mine was just noisy till it died on me yesterday, brand new Sytec pump for up to 500bhp that just dies, thats going back for a refund

[reecegsi]

Any ideas?

[Tillson]

Does it smoke? I have the same problem on my xe, If I put my foot down from low rev's it misses and runs all lumpy.. Im suspecting new piston rings..

[Cav Lad]

I'd try a different Air Flow Metre.

[reecegsi]

Does it smoke? I have the same problem on my xe, If I put my foot down from low rev's it misses and runs all lumpy.. Im suspecting new piston rings..

na doesnt smoke and would rings make it missfire and lumpy thoe?

[reecegsi]

I'd try a different Air Flow Metre.

i will weekend soonest i can get one

[Davey j]

You also want creams and a 2.5bar FPR on an XE with motronic 2.5.

[reecegsi]

You also want creams and a 2.5bar FPR on an XE with motronic 2.5.

ive got creams with 3.0fpr

[reecegsi]

Today i cleaned the dizzy all points and contacts no diiference checked compression 145-150 psi in all pots and plugs are black and sooty? Also when started in morning will start for say 10seconds then cutout but start straight back up?

Any help much appreciated

[garymanc]

sounds like overfueling you need a 2.5bar FPR as allready suggested

[Davey j]

ive got creams with 3.0fpr

Was reading original post where it said yellows.

You want a 2.5bar one on there. It'll be over-fuelling.

[reecegsi]

Oh ok thanks

[reecegsi]

Ive changed the fpr jus waiting for battery to charge then im gonna start it and see what happens

[reecegsi]

Ok all back together and now wont start lol no petrol out the nipple on rail so guessing no petrol getting there how could i find the problem? It has got petrol in and pump powers?

[Foy Bacer]

Find the fuel pump relay and feed the thick red/blue on the plug wire with a + from teh battery - that will run the pump....

[reecegsi]

Ok thanks ill try that now :-)

[Vinci]

You need to connect the three wider contacts together, just bypassing towards the pump is no guarantee to bliss as there might still be a couple of parts not getting voltage. Hence the relay I made with indicators can be a helpful part to make sure all parts are getting voltage. Basically there are three thin contacts of which two are getting connected to ground through the ECU, and one is another live wire (red/blue thin wire...) the first one will switch the first relay contact feeding the injectors, MAF sensor and ICV, and applies voltage to the second relay coil, which is earthed through the ECU, this will give voltage to the pump....

Looking at the wire colours anything red is live, anything brown is ground and anything black is switched live....

[reecegsi]

Got it to fire with foot to the floor then had to keep revving to keep it alive but still no pettie out rail after a couple mins of running? This car is really starting to **** me off now!

Is it a case of look over everything time?

[Vinci]

Don't know if it's been mentioned, but fuel filter??

[Cav Lad]

With you changing the fuel injector etc, make sure you've pushed the loom right down onto the injectors.

All so, when you changed ICV, did you plug the switch back into the ICV?.