Another fuel cut question - but different!!!
28 May 2006, 10:53 AM
#1
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Another fuel cut question - but different!!!
Right,
Still hitting fuel cut in my MY96 STI. It boosts to around 0.8-0.9bar (as per gauge) until around 5k rpm. At that point I can see the needle rising slowly on my gauge until it hits 1.1bar, then fuel cut!!!
I fitted a Dawes and set it to 0.8 bar. Guess what? It still happens, rises slowly from 0.8bar to fuel cut.
Could there be a leak in the vacuum hoses?
Could I have a faulty MAP sensor?
I'm awaiting delivery of a ScoobyECU type chip from ESL. Hopefully this might remedy the problem, anyone?
PLEASE PLEASE HELP ME!!!!!
Still hitting fuel cut in my MY96 STI. It boosts to around 0.8-0.9bar (as per gauge) until around 5k rpm. At that point I can see the needle rising slowly on my gauge until it hits 1.1bar, then fuel cut!!!
I fitted a Dawes and set it to 0.8 bar. Guess what? It still happens, rises slowly from 0.8bar to fuel cut.
Could there be a leak in the vacuum hoses?
Could I have a faulty MAP sensor?
I'm awaiting delivery of a ScoobyECU type chip from ESL. Hopefully this might remedy the problem, anyone?
PLEASE PLEASE HELP ME!!!!!
28 May 2006, 07:33 PM
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Removing the fuel cut would just mask the problem.
And how to eliminate the boost creep, that's what I want to know how to do!!!! Am I best just replacing all of the vacuum hoses? Are these vacuum hoses meant to be very tight fitting?
Anyone?
Cheers!
And how to eliminate the boost creep, that's what I want to know how to do!!!! Am I best just replacing all of the vacuum hoses? Are these vacuum hoses meant to be very tight fitting?
Anyone?
Cheers!
28 May 2006, 09:21 PM
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Someone speak english please 
Scott, he states that he hits fuel cut at 1.1bar
Nick why not say that in the first place, you'll need to port the wastegate enabling it to flow a little more to prevent creep.
Scott, he states that he hits fuel cut at 1.1bar
Nick why not say that in the first place, you'll need to port the wastegate enabling it to flow a little more to prevent creep.
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28 May 2006, 09:56 PM
#8
Originally Posted by Mo
Someone speak english please
Scott, he states that he hits fuel cut at 1.1bar
Nick why not say that in the first place, you'll need to port the wastegate enabling it to flow a little more to prevent creep.
Scott, he states that he hits fuel cut at 1.1bar
Nick why not say that in the first place, you'll need to port the wastegate enabling it to flow a little more to prevent creep.
Have you still got the restrictor in the boost control return pipe ?
Must be a vacum/boost leak somewhere then.
Actuator too tight ?
Last edited by Scott.T; 28 May 2006 at 09:58 PM.
28 May 2006, 10:09 PM
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Originally Posted by Scott.T
Why would he need to port anything. No-one else seems to have this problem.
Have you still got the restrictor in the boost control return pipe ?
Must be a vacum/boost leak somewhere then.
Actuator too tight ?
Have you still got the restrictor in the boost control return pipe ?
Must be a vacum/boost leak somewhere then.
Actuator too tight ?
Are the vacuum hoses meant to be tight fitting? I can easily pull the vacuum tubes off their connectors. Especially this vacuum hose that is attached to my Dawes. IIRC it comes from the wastegate or something, its a larger bore, then goes to a plastic reducer to a small bore (normal) size vacuum tube.
Should all of the vacuum tubes have clips or clamps on them?
Thanks!!!!
28 May 2006, 10:11 PM
#12
The restrictor in the bottom hose needs to be there.
Yes all hoses should be tight and held on with tie wraps or metal spring clips.
Any marginal leak in these hoses will act as a bleed valve and increase the boost.
The ones on the reducers should be OK without clips if they are tight (they don't normally have clips on these).
Yes all hoses should be tight and held on with tie wraps or metal spring clips.
Any marginal leak in these hoses will act as a bleed valve and increase the boost.
The ones on the reducers should be OK without clips if they are tight (they don't normally have clips on these).
28 May 2006, 10:11 PM
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Originally Posted by Scott.T
The restrictor in the bottom hose needs to be there.
Yes all hoses should be tight and held on with tie wraps or metal spring clips.
Any marginal leak in these hoses will act as a bleed valve and increase the boost.
Yes all hoses should be tight and held on with tie wraps or metal spring clips.
Any marginal leak in these hoses will act as a bleed valve and increase the boost.
30 May 2006, 06:29 PM
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Ok, been to the local motor factors and got some hoses to replace the vacuum hoses.
The hose I got was not specific for vacuum hoses though, will this make a difference? It's the hose used for diesel return from the injectors!!!
Do the hoses have to be the exact internal diameter as the ones I'm replacing? As some of the hoses I've bought have a slightly smaller ID, therefore a tighter fit (and hopefully no leaks!!)
Anyone? Please help as these will be going on tomorrow!
Nick
The hose I got was not specific for vacuum hoses though, will this make a difference? It's the hose used for diesel return from the injectors!!!
Do the hoses have to be the exact internal diameter as the ones I'm replacing? As some of the hoses I've bought have a slightly smaller ID, therefore a tighter fit (and hopefully no leaks!!)
Anyone? Please help as these will be going on tomorrow!
Nick
30 May 2006, 09:35 PM
#19
Shouldn't make a great deal of difference.
I changed some of mine to Samco type hose without any ill effects.
Can't remember the internal diameters, but probably a set of 5mm and 3mm. I think there are usually some on ebay.
http://cgi.ebay.co.uk/3MM-ID-QUALITY...QQcmdZViewItem
I changed some of mine to Samco type hose without any ill effects.
Can't remember the internal diameters, but probably a set of 5mm and 3mm. I think there are usually some on ebay.
http://cgi.ebay.co.uk/3MM-ID-QUALITY...QQcmdZViewItem
Last edited by Scott.T; 30 May 2006 at 09:40 PM.
30 May 2006, 09:54 PM
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These aren't silicone though! I'd imagine that silicone would be better as they wouldn't collapse.
I needed some ASAP so the only ones they had were 1.5-2mm thick walled rubber hoses with a weave of material over them. Will these be OK and not collapse?
Cheers.
I needed some ASAP so the only ones they had were 1.5-2mm thick walled rubber hoses with a weave of material over them. Will these be OK and not collapse?
Cheers.
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