Poor engine running

[Ryanbarber]

Hello, I drive a corsa b 3dr (X14xe).

I'm new to the forums and I need help, my car has the following problems;

Rough (shaky) idle but at normal 800-1000 rpm,
Whilst driving down the road 'dead spots' happen ranging from about 2-15 seconds, these happen sort of every 30 seconds.
When I disingage the clutch (foot down), and I was in high revs (2500+) the revs drop to 200 before coming back to 800.
No eml, spark plugs and leads replaced.
I think it's worse with less fuel in my tank but that might just be in my head haha.

Anything to help me will be most Appreciated.

Thank you,
Ryan.

[corsaez]

it sounds like the maf sensor.... have you changed the standard filter and box with a cone/aftermarket filter?? these can cause the issue your discribing. i had something similar on my sxi when i put a cone filter on, i took the maf sensor off and cleaned it with carb cleaner, been ok since apart from the odd flat spot due to still using the cone filter. hope this helps!!

[Ryanbarber]

Hiya, I did think that but I was told this particular egine didn't have a MAF but instead a Intake Air Temperature sensor. I've checked the connection for the IAT anyway and it looked clean so I took no further action.

[johnny]

14xe doesnt have a maf , I'd be looking at the icv or blanking the egr but tbh symptons are all common to several faults lol

[Ryanbarber]

Icv? Also is there anyway I can test the egr valve?

[johnny]

Icv - idle control valve, disconect it while car is running and see if it makes a difference a blanking plate is only a couple quid off ebay anyway so worth doing anyway

[Ryanbarber]

Was looking into blanking the egr valve but I filled up my car earlier and it defiantly dose make a big diffrence. With a full tank the symptoms are Practically non existent. This is making me feel like its a pump problem.

[johnny]

Poosible that you had dirty petrol, when was it last serviced and what was done

[Ryanbarber]

Haha, well it was serviced a year and a bit ago, however in January after my mot I myself changed air filter, oil and the plugs were done a month ago when I started having the problems. I never changed the fuel filter and completely forgot about the oil filter :s.

P.s. fuel pump on order, secondhand and only £15

[johnny]

Oil filter should always be changed as there paper, i would give the oil filter a cheeck and make sure its not in pieces going round the engine which would not be good haha and give the fuel filter a change too

[Ryanbarber]

Ok will do, can I change the oil filter without draining the oil? Or will it pour out everywhere? And same goes for the fuel filter.

[johnny]

Na youl need to drain the oil but you can pour it back in if its still good and a small bit of fuel will come out put it wont empty the tank though its just a small bit in the line and filter

[Ryanbarber]

Wow, ok so the pump I ordered came. I replaced the fuel filter and car started worked the same as before, then I replaced the fuel pump yesterday and whilst driving up the road with a max speed of about 10mph it backfired like crazy! I disconnected battery and waiting while I had a fag then started her again. This didnt do anything. I ran it for a while to 'get the air out' which didn't change anything.

When I push in the Scaerader valve on the fuel rail whilst ignition on nothing comes out of it, with engine started there is a little dribble. No fuses in my fuse box are blown, I swapped the fuel relay with another 12v 30amp relay i found in the engine bay,which didnt do anything either.

[Ryanbarber]

Ok massive brain wave, I'm thinking there's a split or the suction pipe on the regulator has fallen off? Ruff idle, low fuel pressure, irratic throttle and misfiring?