misfire - fuel starvation?

[CTO3]

hello all

had a misfire/loss of power when accelerating out of left handers at anglesey at the weekend. was on half to full load, not at any particular revs. seemed to correspond to when fuel gauge dropped down to 1/4 full or less - due to lateral g. the tank was about half full in reality. all vacumn hoses/etc looked fine.

sounds abit like robp's recent problem, any ideas?

thanks

conleth

[daddysumo]

Yep sounds similar to the misfire I had. Change the fuel pipe between the pump and filter for some good quality high pressure stuff and make sure you route it so it has no sharp bends in it.
Did the trick for me

Steve

Edited by daddysumo on Monday 3rd November 00:39

[RobP]

CTO3 said:

hello all

had a misfire/loss of power when accelerating out of left handers at anglesey at the weekend. was on half to full load, not at any particular revs. seemed to correspond to when fuel gauge dropped down to 1/4 full or less - due to lateral g. the tank was about half full in reality. all vacumn hoses/etc looked fine.

sounds abit like robp's recent problem, any ideas?

thanks

conleth

Hi Conleth - certainly worth replacing the low pressure fuel hose as a start.
Other than the misfire did you have a good time at Anglesey? I was there for the previous Sunday/Monday and had a stonking time with a window of dry weather between the gales, floods snow and ice! Journey there and back on the Corsa clad carbons wasn't very clever.

[CTO3]

cheers chaps

is it an easy job to do yourself? difficult to get to? if DIY what high pressure hose would you recommend steve? or is it best left to a garage?

apart from the misfire problem anglesey was fantastic fun. standard shocks had worn so were replaced with nitrons, still need to do a bit of work experimenting on the settings. search function wasn't working on here last week so didn't manage to get alex s settings to try. was getting abit of understeer on track but when checked later was running on alex's suggested road settings, which would probably explain that! also went for a similar set up with the oil cooler to yours, minus the fan, kept temps around 100deg most of the day.

apart from the hairy drive down, how were the dymags performing?, apart from looking stunning


cheers

conleth

[RobP]

The actual replacement of the hose couldn't be simpler - just remove n/s rear wheel arch liner and it's the bit of hose between the fuel filter and the pump itself. Make sure you get high pressure FUEL hosing (Pirtek or equivalent will supply). The tricky bit is to make sure you have as little fuel as possible in the system and have some suitable size container to accommodate any spillage.
Dymags were brilliant on track - the car felt altogether more nimble; the same sort of difference you feel when driving on your own vs having someone in the passenger seat.

[CTO3]

cool, cheers rob.

do you know what diameter by any chance?
going away for a couple of weeks so may order it from demon tweeks + fit when i get back, they offer sytec 6,8,10 + 12mm diameter

thanks

conleth

[Roop]

Certainly worth doing as soon as possible. Running lean under high load conditions (eg: on track) can (as I understand it) be fatal for turbocharged cars. Melted pistons spring to mind...

[daddysumo]

If you block the breather hose and keep the filler cap locked down then vacuum will hold the fuel in the tank while you remove the hose.I think its 19mm from memory but best to check.

Steve

[RobP]

Roop said:

Certainly worth doing as soon as possible. Running lean under high load conditions (eg: on track) can (as I understand it) be fatal for turbocharged cars. Melted pistons spring to mind...

True if the engine is running lean, but in this situation (if it is the same as the issue that I had) the fuel is completely cut off as the pipe collapses, so the engine simply cuts out (feels like a misfire). On the computer it was so instantaneous that it just had to be an ECU/electrical fault; in the end it wasn't, of course. Very annoying but at least not damaging to the engine.

[RobP]

daddysumo said:

If you block the breather hose and keep the filler cap locked down then vacuum will hold the fuel in the tank while you remove the hose.I think its 19mm from memory but best to check.

Steve

Nice one Steve -wish I'd thought of that! Can't remember the hose size either but a quick call to Noble or a Main Stealer will give the answer.

[hollowpockets]

My car is doing this just now, not had a chance to fix it yet, who supplies replacement hoses?

Oh i received my pro-alloy water header tank and breather tank on Friday, the quality is very impressive, will fit and take pictures when i get home from offshore, can't wait to get the hard-pipe kit and intercooler to go with them!

G

Edited by hollowpockets on Monday 3rd November 14:19

[CTO3]

just got back for hols today and took off rear n/s wheel arch lining to have a look at replacing the fuel hose. looks like 19mm as suggested previously,
is it the 'c' shaped bit of hosing on the left half of these pictures that needs replaced?





also what is this? as the top end i assume should be connected to the pipe i'm holding, the other end runs to the ?overflow pipe, if the fuel tank is overfilled, petrol leaks out if you try to brim the tank too much





thanks

conleth

[RobP]

Hi Conleth - yes it is the C shaved bit of pipe (between filter and pump) that your's looks like it is braided high pressure hose. I doubt that this would be collapsing under acceleration. And yes the other pipe is for overflow.
Cheers
Rob.

[S26VE P]

Maybe my eyes but is the pipe not kinked slightly already?

[daddysumo]

I can see the pipe (which looks like the standard low pressure crap) is kinked exactly like mine was where it exits the filter and turns sharply left.... that was the prob on mine, if you make that a more gentle sweep, ie a larger radius it wont kink and you rpeblem should go away.
The broken bit is the roll over valve, mine was playing up so I removed it completely its only there to stop leake in a roll situation. I have purchased a new one but not fitted it yet its from a fiesta the part number is on it.
I have it somewhere if you cannot locate it.

Steve

Edited by daddysumo on Friday 14th November 17:59

[CTO3]

cool,

will try that, it is kinked at the end.

cheers folks

conleth

[JLSELAN]

Just a suggestion, but it's probably a good idea to take this opportunity to clean/refurbish the fuel filter at the same time.

[NobleGuy]

JLSELAN said:

Just a suggestion, but it's probably a good idea to take this opportunity to clean/refurbish the fuel filter at the same time.

Can they just be taken apart and cleaned rather than replaced?

[JLSELAN]

Yes.