hesitant whooshing noises

[james walker]

2nd thread start of the day for me!!

recently when on part throttle i can hear air being sucked in and kindof sounds like tsssh then holds on part throttle then dumps then holds etc hard to explain but on full throttle hard revs it holds fine just sounds loud and intermittant sometimes? if that makes sense at all. kind of sounds like darth vader on speed

full throttle i get a whistle noise aswell like turbo whistle but theres definate hesitansy low revs.

anyone else get this or can explain better please?

 

[adam cupra 20vt]

Yep I had excatly the same problem [hesitansy low revs] when I fitted my FMIC.

According to JabbaSport it was because the intercooler and exhaust made the system so free flowing the turbo was trying to spool up on the slightest bit of throttle but the ECU map was pulling it back.

 

[james walker]

hmmh, made the noise before i fitted fmic adam aswell.

 

[adam cupra 20vt]

Ahh rite, when I had excatly the same problem it was due to the map not being set up to the mods, once mapped its fine now

Perhaps yours is a different problem mate

 

[james walker]

yeah i guess so, mine hasnt been mapped since fmic, but im on stage 2 now, will said no need to remap after fmic installation.

 

[james walker]

well i think ive found the issue.... started missfiring quite badly on hard revs, when i unplug the maf, hard revs no missfire and hesitancy gone.

so im guessing the maf is shot, low g/s on my recent logs aswell.

weird how this causes missfire though, maybe coils on way aswell.

pulls like a train again when the maf isnt plugged in.

 

[greesha]

Glad you found the source of your problem... Im still looking for mine :<. new N75 to test over the weekend. But just in case Im going to try MAF as well.

 

[james walker]

have you not checked the maf?

mine was running low g/s on vagcom.... did you do some relogs?

 

[Mylo]

Greesha ran 226 bhp on sunday so hard to say why it's laggy. Our graphs were very different

 

[ibizacupra]

well i think ive found the issue.... started missfiring quite badly on hard revs, when i unplug the maf, hard revs no missfire and hesitancy gone.

so im guessing the maf is shot, low g/s on my recent logs aswell.

weird how this causes missfire though, maybe coils on way aswell.

pulls like a train again when the maf isnt plugged in.

lean misfire, not unusual at all

 

[james walker]

will the maf being shot cause it to run lean?
hopefully so as this will solve 2 problems in 1 tbh

 

[greesha]

No James i had no chance to re-log yet.

What do you mean by low MAF readings. I was getting 178 lately not sure what is a good reading for a stage 1 LC.

Mylo i think that those RR results were very optimistic (225? ;D) . Anyway i was comparing my graph to my old one and torque is lower all the way...

I've checked MAF yesterday - seems fine. All IC pipes tight. New MAP sensor inside. No idea.

 

[james walker]

178 is right for mapped lc mate, maf will be fine.

mine is shot causing the ecu to think not enough air so underfuels casuing it to run lean.

 

[stef cupra]

ive got this aswell mate, changed n75 to n75j and it cured it

 

[greesha]

James i remember that you were saying that you have a strange wooshing sound from the area of inlet manifold. Was something wrong with that ?

 

[james walker]

couldnt find it mate, more coming from dv letting air out tbh.

still hear a hissing somewhere.... gonna wait until i do catch can and replace pcv system, see if its that

 

[james walker]

hissing now seems to have gone, since i fitted new maf?? hmmh strange one.

also low revs whooshing gone since reversing dv????