ive just got my car back after new o2 sensors installed,recircs checked and ok at 7 psi. whilst driving up to see timmy get his car back i was racing terry in his silver zed and i got very bad hesitation at about 100mph,does anyone have any sugestions(please look at recent posts for more history on this)(recircs/bovs)

 

after slowing down and keeping my boost below 0 i arrived at pps,telling paul,ian and timmy what had happened,they had no idea?(this after checking all connections)

 

then i took ian(MAC1)for a spin ,to show him the probs i have with my car

 

ive got a sound when at high boost/change gear like when blowing hard down a hollow pipe(low pitch tone)

like when ya blow over a bottle

i only get this sound when in +boost but not always at gear change,i get this sound nearly every time i accelerate

also i have no loss of boost/power/performance

 

after a lot of reading i thought my recircs had stuck,which was why i had thought i was getting the blow off valve type sound, this ive had for a while!)

ive also thought that this new sound was because of the recircs ,but as ive had them checked i no this is not the problem

this sound is quite worrying and along with the hesitation even more so!

 

come on guys you must have some ideas or i am gonna have to make the long track to S-E

to see if i can sort this out.

 

any ideas /suggestions or even guesses are welcome

jaylox

 

 

it sounds like you have a boostleak and probably near the intercooler/intake area.

At what boostlevels do you start to hear this sound ?

 

 

can this sound i have also be the reason for the hesitation?

jeff,andy,nico anyone help plz

thanks in advance jay

me 2 bubby i have the same noise but not when accelerating only when gearchange or lifting off the throttle during boost, i too thought bout the recirc v\v, the noise only started when i fitted the new twin cone induction kit, it sounds like the boost is passing back throught the induction kit using it like a trumpet to amplify the noise, if it was a boost leak then the noise would be there during boost at all times.

i have an idea but am unsure bout this???

 

after fitting the kit the boost raised up 2 13psi not sure if its cos of the new turbo technics stage 1 turbos or cos of the induction kit, so if the recirc v\v, works from the signal of the airbox then fitting a new induction kit alters the signal to the recirc i.e 2 much air or not enough causing them 2 pass at a lower pressure but testing them on the bench they r perfect due to a proper signal what do u think or am i talking boll@ks, cheers guys any help appreceated.

Originally posted by lymon:

it sounds like you have a boostleak and probably near the intercooler/intake area.

At what boostlevels do you start to hear this sound ?

 

 

Yup

 

email me ya number and ill give ya a call

j4lox@hotmail.com

last message was for fastredz

warren i'm just going out now to find out,back in a bit!cheersjay

warren i usually get the noise when ive accelerated quite hard,and suddenly took my foot off the gas.the sound is the same as if you were to blow over a glass bottle.

i only sometimes get the sound whilst revin between 0 and 10 psi as i am accelerating

here's my number bud 07748961428 anytime u wanna chat and sort this annoying noise out!!!

didnt catch ya name m8,will let ya no tommorow if i find out what the prob is we are having.jay

the name is dewi i'll try this week 2 put the airbox back in and give it a go good luck with the garage 2mos bud hope we sort it soon!!!

JEFF TT,THANKS MATE ,ANY IDEAS...JAY

Jay mate,

 

I've been on TT.net to try and solve this for you or at least give you some ideas.

 

Just some hunches...

 

Fan Clutch

Power Steering Pump

 

Quote: "The recirculation valves make this noise and you can now hear it inside the car because you have removed the stock airbox.

Most Z's suffer with this although some worse than others.

 

I don't think anyone has managed to cure it yet!?!"

 

One guy said that he had this problem and after fitting APEXi BOV's it cured it!

 

Some of the guys reckon it's the aftermarket intake and one Z peep in yank land reckons it could be a wheel bearing!

 

Not alot of help I know, but if it persists get it in with someone who knows what they are doing.

 

I would suggest Ian at Hiteq in Wigan seeing as you are up North Bro. SE are fantastic IMO but for you that is a mega jaunt.

 

 

 

 

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dewi,ive got it soted i hope,timmy turbo has helped me out loads and im gonna be doing a load of work on the car tommorow.i'll let you no wat to do

1,change ya induction for starters

call ya tommorow.jay

Thinking about it, this could be caused by the lack of vacuum after the filter. Fitting an induction kit effectively makes the air filter less restrictive. When the turbos spool up, and suck air through the filter, if there is less restriction then there will be less vacuum. This is the point where the recircs dump the air back. If the recircs rely on vacuum to pull them shut when you get back on the power, then having an aftermarket filter will affect their operation. If you understand this, great, if you don't then erm..... Basically what I am saying is there is a possibility that this problem is inherent with fitting an aftermarket filter - therefore get rid of the recircs and fit bovs. I am not saying this is deffo the case though

 

HTH

 

CheerZ,

 

Andy

And things just get worse!

today i put some injector cleaner in my petrol so see if it would sort out my hesitation problem?

 

well about ten mins after i had put this in i noticed my oil pressure starting to drop(down to about 10-15 psi at idle)coincidense?

checked my oil level and its fine ,temperature-fine

running the car at speed the oil pressure reads about 30 psi

then after about 10-20 miles on my way home my boost is only 4 psi max on 0.60 on my hks controller(maybe this is because of the cleaner ?)

 

does any have any thoughts about my problems now?-

thanks jay

 

 

[This message has been edited by jaylox (edited 24-06-2002).]

i thought so fellas cos when i fitted the induction kit the boost raised up to 13psi on the turbo,s all makes sense i think anyway, jaylox good on ya! bud glad u got it sorted now with the injection cleaner maybee just a guess now mind but has it caused the safety boost to come on might need a few miles to wear off till the det sensor reads normal again due to the chemicals in the cleaner uppseting your fuel mixture, oil gauge mine does that to drops low during idle, sure i read somwhere that the gauge isnt very accurate hope this is of help to u bud!!!

hey bud

talkin to timmy turbo las t nite

he said try injector cleaner(which i have done)

clean throttle body with cleaner(gonna do tommorow)

change induction(k+n is crap)

reset ecu(leave disconnected for a couple of hours)

buy some bovs(buying next week)

sounds like andy is right to me so im gonna buy me some bovs and get shot of the recircs(shite)no good with the extra boost

 

jay

Erm, why is the K&N crap??? Changing this will not get rid of your hesitation. The injector cleaner (possibly) effectively lowered the octane rating of your fuel which caused some minor dettonation which caused safety boost.

 

However the hesitation is more than likely linked to the safety boost. Have you checked the conector on the ecu??? You've just had it chipped haven't you? Check the ecu comnnector is straight and fully seated Also, check the left hand temperature sensor on the top metal coolant pipe coming from the front of the engine. Check the connections for the green shite and also measure the resistance to see if the sensor is reading correctly.

 

HTH

 

CheerZ,

 

Andy

ANDY,on my ecu wires(about 3 of em)there is some plastic connectors which look like someone has had something connected and removed the connecting wires(you no wat i mean by wire connectors)

well should i take em off (the wires will be crimpt)or should i leave em?or should i cot the wires and re-connect with connector blocks?

 

the hesitation was there after i had my 02 sensors and recircs replaced,about a week ago

how do i check the resistance of the sensors,i'm not very good with checking electrics but lately ive done a lot and getting better so i should be able to do this

volt meter expert now ..lol

anyway im going to get the carb cleaner out and do my throttle bodies

let me no mate..thanks jason

just been talking to ian at hiteq

he said he thinks i have a air leak?and listening to my car ive got a hissing sound at idle near/below my ptu.looks like a front nosecone off job.thanks guys jason

ive just been talkin to ste(wild turkey)and ive had a thought that maybe my sound is related to not havin my cat removed?as i now have extra boost running with after market induction but ive got standard down pipes .maybe with new down pipes it would aid in releasing some of the presure?

gonna look into this ...i'll be back!!jay

Andy, I didn't tell him that the K&N was crap. It's over four years old and Jay told me that when he looked in the throttle bodies that there were streaks of oil lining the tracts!!! Gulp!!! Only so much oil a paper filter will hold I suppose until it reaches complete saturation.

 

I wouldn't have thought oil getting through the filter, around the MAF sensor and into the TB's was a very good idea!

 

I reckoned it would be best to buy a new one IMO.

 

P.S. filter oil I'm on about but you'll know what I was on about! LOL

 

 

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[This message has been edited by Timmy_Turbo (edited 27-06-2002).]

Streaks of oil in the tracts is normal - its part of the breather system I wasn't having a dig at all with the question - just curious as to why...that's all

 

Jay forget the cats for now - they are not causing the problem! Get this prob sorted before going further with power Throwing mods at it aint gonna fix the basic problem... I presume you mean the little blue or red scotch lock type connectors for joining 2 wires together? I'd leave them there to be honest unless you really want to remove them. Don't use screw blocks either if you want to join the wires - far better to solder them. You may have blown a vac hose off with the uprated boost. Check under the throttle bodies (pass side under the front, drivers side underneath pointing towards wing) and make sure those vac hoses are on

 

If you want me to have a look just ask - we've got a gaggle ( ) of zeds coming on saturday for a bbq so why not pop down?

 

CheerZ,

 

Andy

andy where are ya on saturday?me and mac were gonna do some work on our cars but maybe we'll come and see ya?thanks jay