my zed failed its ticket on fumes could this be down to the afc set up to run 14psi see my theory is this - its set up to run 14psi but obviously when you rev the engine without load no boost is being used so at 5000rpm theres no boost but its putting in 14psi worth of juice which is big over fueling so would this cause it to fail on fumes ??? advice please if this couldnt be causing what other possibilities should i look at ??? regards jim

I didn;t think cars this old had to have an emissions test ?

dont they just go through a basic emissions test?

If your O2 sensor isnt working that would fail it. I had this ie: one O2 not working and too high so tester (who i got on well with) switched to the working side and hence passed

Pretty sure mine had to pass an emmission test on a 96 plate last time, don't quote me but i think it applies to cars after 1993-4 have to meet stricter emissions tests.

 

Someone please correct me if i'm wrong though

my zed failed its ticket on fumes could this be down to the afc set up to run 14psi see my theory is this - its set up to run 14psi but obviously when you rev the engine without load no boost is being used so at 5000rpm theres no boost but its putting in 14psi worth of juice which is big over fueling so would this cause it to fail on fumes ??? advice please if this couldnt be causing what other possibilities should i look at ??? regards jim

 

If setup correctly the afc will not make any difference. Who set it up for you?

http://www.300zx.co.uk/forums/showthread.php?t=27060

Wans't there a trick with pulling a vaccum pipe off the plenum to allow lower emmissions ?. I can't remember the exact details, it may have even been a hoax.

If setup correctly the afc will not make any difference. Who set it up for you?

sanspeed superchips in bexley heath

my zed failed its ticket on fumes could this be down to the afc set up to run 14psi see my theory is this - its set up to run 14psi but obviously when you rev the engine without load no boost is being used so at 5000rpm theres no boost but its putting in 14psi worth of juice which is big over fueling so would this cause it to fail on fumes ??? advice please if this couldnt be causing what other possibilities should i look at ??? regards jim

hello mate depends what year it is ,,and whether its english of jap as the end of year dates are different in japan to england ..hence no cats

Wans't there a trick with pulling a vaccum pipe off the plenum to allow lower emmissions ?. I can't remember the exact details, it may have even been a hoax.

 

http://www.300zx-twinturbo.com/tech/co/co.html

 

Think thats what you mean? Pull the fuel pressure dampner hose according to the guy and it'll trick the machine.

It isn't putting fuel in for 14psi if it isn't running 14psi! The system isn't that crude. The airlfow meter measures the amount of air going in and the ECU adds fuel accordingly...

What were the readings, the garage should have given you a print out of the test and not just handed you the failure (VT30 certificate)

 

Its possible they have tested to the wrong limits.

What were the readings, the garage should have given you a print out of the test and not just handed you the failure (VT30 certificate)

 

Its possible they have tested to the wrong limits.

 

The car is at a garge at the moment they took it to get mot , its still up there where they are trying to eliminate the problem . They have had to car for 5 months sorting out an engine misfire and done some work on the egr , in this time the ticket has run out . They subsequintly took it for a ticket and it has failed , i phoned the guy today and he said the reading was 5.2 % he said it might just be where the car has just been sitting for a while or a coolant temparature sensor i dont know how that makes a difference , im just worried that its going to be something expensive like sticking valves or something ??

 

Also the guy said the turbos on the car were larger than stock and it runs true because i notest more than normal turbo lag since i bought the car i have only done about 1000 miles since i had the car , i had rolling roaded about 500 miles ago and it was kicking out 385 bhp at 13.5psi anyone got any i idea what these blowers on my car could be????

Fook me! 5.2%?????????? Thats way out!!! If only you weren't so far away.....

Fook me! 5.2%?????????? Thats way out!!! If only you weren't so far away.....

 

What you think there could be a major problem ???

Only with the setup, which safc is it?

Only with the setup, which safc is it?

 

mate im a bit green all i know is it is a apexi safc i dont no what model it is . It has 5 or 6 nobs to adjust the fuel at the different rev ranges do you think this is the cause of the problem ???

Well you could certainly turn the lower ones down a bit to get it through ;)

 

Make a note of all the settings BEFORE you change anything though :) Sounds like an SAFC I to me.....

Well you could certainly turn the lower ones down a bit to get it through ;)

 

Make a note of all the settings BEFORE you change anything though :) Sounds like an SAFC I to me.....

 

Whan doing the emisions test what is the car reved to ???

Tell you what, list what all the settings are on here ;)

Tell you what, list what all the settings are on here ;)

 

 

i aint got the car here mate its at a garage at the mo ill come back to you on that one shortly watch this space cheers for the help regards jim

Ok no worries :)

Ok no worries :)

 

jsut to add when the car was set up on the rolling road there was an egr problem (it was leaking) and the exhaust was also leaking on the flange from the turbo to the downpipe this has been fixed but was set up when it wasnt fixed so would this make a difference on the emisions now ???

Yes it could well do if they set it up with a wideband O2 up the tailpipe...

Fook me! 5.2%?????????? Thats way out!!! If only you weren't so far away.....

 

We've seen higher... remember? :rofl: