prob wen giving the beans
29 December 2008, 06:03 PM
#1
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prob wen giving the beans
currently wen im boosting or reali giving it the beans , the engine seems to jump and and cut out and imeadiatly jump back into life, this fault is onli on boost , its a 93 impreza wrx , various mods , headers, de-cat ,induction -blitz DV, runin about 1.1 bar any ideas????
29 December 2008, 06:12 PM
#2
Probably either of the below:
a) Hitting fuel cut because of overboosting i.e. exceeding the MAP sensor's 1.2bar rating. Is the cut violent like 'hitting a brickwall', which can throw you forward against the seatbelt?
b) The boost is blowing out the sparks momentarily.
Remove and check overall condition of the plugs. Clean them up if still serviceable. If not then get new ones... get the colder NGK PFR7B.. Before refitting, regap them to 0.65mm (to compensate for old coilpacks and 1.1bar of boost). Talking of which, check the state of all 4 coilpacks whilst they're removed. Any obvious hairlines, splits or cracks, then replace as necessary...
a) Hitting fuel cut because of overboosting i.e. exceeding the MAP sensor's 1.2bar rating. Is the cut violent like 'hitting a brickwall', which can throw you forward against the seatbelt?
b) The boost is blowing out the sparks momentarily.
Remove and check overall condition of the plugs. Clean them up if still serviceable. If not then get new ones... get the colder NGK PFR7B.. Before refitting, regap them to 0.65mm (to compensate for old coilpacks and 1.1bar of boost). Talking of which, check the state of all 4 coilpacks whilst they're removed. Any obvious hairlines, splits or cracks, then replace as necessary...
Last edited by joz8968; 29 December 2008 at 06:33 PM.
29 December 2008, 06:16 PM
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I had the same sort of problem, mine was dying around 5000rpm. It turned out to be one of the ht leads. So might be worth checkin your ht leads and your coil pack.
Hope this helps.
Hope this helps.
29 December 2008, 06:17 PM
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Sound to me like you are hitting boost cut.
Mine has done it a couple of times lately in this cold weather, the last time it did it I managed to watch the boost gauge and it had reached 1.1 as it did it.
Ady.
Mine has done it a couple of times lately in this cold weather, the last time it did it I managed to watch the boost gauge and it had reached 1.1 as it did it.
Ady.
Last edited by adrianp; 29 December 2008 at 06:17 PM. Reason: spelling - oops
29 December 2008, 06:19 PM
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what ecu is it running? is it chipped? boost controller?
....is it like hitting a brick wall when it happens? (quite violent)
sounds like it could be fuel cut.
....is it like hitting a brick wall when it happens? (quite violent)
sounds like it could be fuel cut.
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29 December 2008, 06:27 PM
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You'd be surprised.
Motor can 'tolerate' slightly dodgy coilpacks and/or plugs at std 0.8bar boost. But when upping to 1.1bar, it can really show up any defects in the ignition system by misfiries, etc...
EDIT: As just perfectly illustrated by scooby1508 above!
Motor can 'tolerate' slightly dodgy coilpacks and/or plugs at std 0.8bar boost. But when upping to 1.1bar, it can really show up any defects in the ignition system by misfiries, etc...
EDIT: As just perfectly illustrated by scooby1508 above!
Last edited by joz8968; 29 December 2008 at 06:28 PM.
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