sr2o allergic to boost

just trying to sort out the only problem with my 180 shes a blacktop non vvl engine the problem is the car ticks over and drives fine out of boost but as soon as she comes into boost it just bogs down and starts missin like a hure then let off and give it light throttle out of boost again and its fine until boost come in..the engine is stock just airfilter/dumpvalve..i took the pipe off the dumpvalve and bunged it made 0 differenc checked the plugs they look fine only new actually there bosch platinum..checked all intercooler(stock) piping no leaks or slits anywhere any ideas????:confused: maybe afm???

i had a very simialr problem with mine man, it was a t-piece i has joining to vacume line one side of that became unblocked and was sucking too much air, so id say check all your boost pipes that go to your boost gauge if you hav one and check all your pipes to the dumpvalve and to your boost solenoid and make sure there is no leaks at all, i wouldnt say it anything serious, definetly just a leaky pipe id say

I'd be checkin the fuel pump
and even if the plugs look good they may still not be right, id throw in a new set

if none the above work. try checkin the lamda sensor, oxygen sensor on the exhaust. Friend of mine had problem like that wit his 180 eventually found out it was that sensor

my 180 done the same thinmg and it was the afm cudnt read wen engine was boosting

check the pipe thats going into the air filter..
we'd this prob with pauls car and got a new one and job done..
it was when you went on boost the pipe was staying closed and not realising...
its the one beside the manifold...

check all your boost pipes... i repaired a s14 that had simular simtoms... one of the samcos was split and opened up completely when boost was applyed...

cheers for the help lads iv gone through most nearly all the pipework and i think the problem is leaning towards 02 sensor,afm or fuel pump..

If its at full throttle its no the O2 sensor.

I can stick it on the dyno for you and tell you whats wrong is 20 mins.

Robbie

iv same prob wit my 13 pure head wreckin

was out at this again yesterday changed the plugs cleaned the afm..still missing on boost all tats left now is fuel pump anybody else got other ideas??would an injector cause this problem asswel?

boost cut? my ca18 got it when i put a fmic on it

never heard of that b4?

wad it drivin fine before an jus started happenin???thats was happened to mine changed plugs an coilpacks an still happenin so i reckon its the fuel pump or o2 sensor

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Originally Posted by jdmjimmy

never heard of that b4?

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the standard ecu senses the boost being too high and it cuts the fuel delivery. it feels like it cough and splutters at a limiter at like 4000rpm just as its about to hit boost!

i had to get a horsham chip in my 200sx to eliminate it. it was only after id put on the fmic that the turbo was boosting a little higher and causing it!


does it feel like ur foots boucing on the acceletor and the cars all jumpy?

its not rev limiting anyway jus gets very spluttery standard fmic

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Originally Posted by way2fastforu

wad it drivin fine before an jus started happenin???thats was happened to mine changed plugs an coilpacks an still happenin so i reckon its the fuel pump or o2 sensor

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bought it like this man think your rigt but the 02 sensor looks to be new on mine

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Originally Posted by jdmjimmy

bought it like this man think your rigt but the 02 sensor looks to be new on mine

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prob fuel pump then...im goin tryin one out of a 180 in mine to see does it make any dif cos its annoyin as fuck!!any bit of boost at all an it starts splutterin even tho it clear out in higher revs/boost on mine

see fuel/boost cut here in this vid as it comes on boost http://www.youtube.com/watch?v=fziuPOwqBmM

its not fuel cut thats happenin in mine an id say jimmys is same as mine....hesitates on boost from the start the boost range but if ya keep the shoe down in mine it clears out wen it get over .4 bar ish an boosts fine in higher boost range

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Originally Posted by way2fastforu

its not fuel cut thats happenin in mine an id say jimmys is same as mine....hesitates on boost from the start the boost range but if ya keep the shoe down in mine it clears out wen it get over .4 bar ish an boosts fine in higher boost range

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that sound like timeing to me, what ecu is in ur car?? also other mods

standard ecu fmic exhaust from turbo elbow back hks mesh filter ngk plugs sard bov orc clutch...timin is fine hasnt jumped or slipped since i set it wen i done head gasket jus started happen round end november but cars been off the road since then...i reckon its fuel pump cos its like its not gettin petrol wen comes into boost an hesitates then if ya get me

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Originally Posted by way2fastforu

standard ecu fmic exhaust from turbo elbow back hks mesh filter ngk plugs sard bov orc clutch...timin is fine hasnt jumped or slipped since i set it wen i done head gasket jus started happen round end november but cars been off the road since then...i reckon its fuel pump cos its like its not gettin petrol wen comes into boost an hesitates then if ya get me

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what head gasket did you put on it? is the cam position sensor in proper and timed right

jus standard head gasket...ya cam sensor is fine car was runnin grand for months until it started actin like that in nov

ye ok but if its missing bad it may not be the fuel pump it could be under fueling due to timeing not 100% and the missing is it knocking (pinking) iv seen it happin a good few yokes and you can drive it trough the missing, what boost are you running? and also did you gap the plugs??

posssibly faulty knock sensor also or damaged wiring to the knock sensor it will pull the timing disconnect the plug and pop on a good knock sensor and see if it makes any difference ps they are a bitch to get at but there is a plug at the top of the inlet manifold

its not actually missin its jus like there no petrol go in like its not gettin power ..its jus runnin .75 boost an plugs are gapped

boost leak?? dampness around plugs/coilpacks? fuelling?

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Originally Posted by nikkisixx69

boost leak?? dampness around plugs/coilpacks? fuelling?

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no leaks an no dampness round the plugs...im thinkin its possibly fuel pump maybe

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Originally Posted by way2fastforu

no leaks an no dampness round the plugs...im thinkin its possibly fuel pump maybe

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ye try the pump, it will narow it down a bit if it does not solve the problrm

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Originally Posted by gem-s13

ye try the pump, it will narow it down a bit if it does not solve the problrm

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ya i no lad that has 180 for breakin so jus gona borrow few parts off it an see wat solves it...thanks for help anyway dude

my 200 had the same problem when i got it first. then rob (slammed mind) got at it and sorted it out i think. so maybe get onto him

think im on the right path now just thinkin there the dump valve aint venting as loud as it should can barely hear it so im thinkin maybe its the wastegate or somethin...i took off the vac pipe goin to the top of the bov and bunged it wel but made no difference would doing that completely elimenate the dump valve or should i take off the dump valve and hot pipe to check if its the dumpvalve causing the trouble ie boost leak?

take the dumpvalve out and throw in the bin... would be more of a better solution

might not be the prob either so no point throwin out a good blitz bov

i had a similar problem with mine but i was changing a water pipe under the injection system and never sealed the injection system right afterwards and was sucking air like fook soon as it was sealed ryt was 100% could be a last resort if nothing else is working??

try fuel pump jimmy it sorted mine out:D

savage try it tomoro have one at home

worth a try anyway if it doesnt sort it least ya'll no its one less possible thing