Im Getting Desperate

[davehg]

Guys,

i need your expert help, i have a FD just just been rebuilt but it keeps knocking, we have checked the plug leads, coils, oil injectors and wiring loom, the knock goes mad when you let off the throttle or change gear but it also knocks when you accelerate at anything other than a snails pace.

any help would be appreciated.


Dave

[davegttph1]

When you say knock.. do you mean just a clunk type knock or you on about something more serious like pinking/knocking?

if its a clunk type knock then check engine mounts Id guess??? does it do it when the cars not moving if u rev the engine???

[Donato]

Did you rebuild or was it a garage? If it was a garage, i suggest you get on the phone to them!

If not then, have you checked the wiring to the actual knock sensor itself, maybe a loose connection or broken cable..?

Hope you get it sorted...

[davehg]

Sorry not very clear, i mean knock as in pinking etc, the guy who built it has been very helpfull but we just cant find the problem, the knock sensor has been replaced.

i thought that someone may of had a similar experience.

at this rate i wont be making rotorstock :mad:

[Donato]

Might be worth phoning one of the tuners, they might have come across this before...

[davegttph1]

If the rebuild was done by a garage then if it was me it\'d be straight down there.... left with them and told to sort, if they cant sort it take it too a 3rd party and get the bill forwarded onto the garage who did the rebuild...

personally wouldnt be touching anything yourslef otherwise the garage could claim youve been messing and invalidating the warrenty....

thats my take on it anyhow... you may or may not find it helpful but there you go

[davehg]

I cant fault the person who built it as he has check everything out ie wiring loom etc. it just one of those things that puzzling....

[davegttph1]

Not saying lay any blame but in all honesty if he cant fix it and the fault has come about from any work he carried out on the car then youve got to fix it somehow... if neither of you know how then look at a 3rd party.... its the only route to take IMO... unless anyone obviously comes up with suggestions here...

do you know anyone nearby with an ECU??? could be worth swapping them over and seeing if thats the prob? just a thought

[Donato]

The Ecu would be a start. Is it a standard ecu or an aftermarket?

also if it a new knock sensor, was this done because the other one was broken? If not why not try the old one, brand new things can be faulty sometimes...

Is the knock sensor tightened properly?

[davehg]

i replaced the sensor to see if the old one was working. ive been talking to a specialist and he thinks that it could be fuel pressure. if the pressure was low could you still get the correct afr at low revs???

the ecu is an apexi and has been checked out

[Donato]

Did you do any other mods when you where rebuilding? when i did mine i had uprated turbos intercooler injectors so i got a better fuel pump too....

[FD3UK]

Just to get a better picture, are you talking about knock you can hear or just the readings that you are getting off the PFC Commander?


Kev

[davehg]

No no mods at all, it was already street ported and a single turbo, the only thing that was done was to clean up the ports slightly. :confused:

[shaunwil]

Isn\'t the knock level adjustable on the pfc, the manual says it only flashes when it goes over 60 on the reading. I think pip said you can adjust this when tuning, so the ratio is different on the readout. mine is flashing at the min, so taking it easy, but the reading has gone to 71 on the knock readout.

I noticed it said in the manual that the figure don\'t mean that knock is happening.

Hopefully one of the tuners can give you more advice on the fact. Better one of them explaining it first hand.

I may be completely wrong, got told about 8 months ago at oulton park ! But may just be settings in the pfc.

Whats the max reading you getting on the commander ?

Shaun

[jonrx7uk]

Easiest way to check if it is pinking is to check the knock value under part throttle.  Mine reads up to 100 sometimes just tickiling the throttle at about 3000rpm.  Might just be a vibration near the knock sensor, or knock sensor not tight.  Apparently a dab of superglue on the knock sensor threads can cure an over-reading.  I got Pip to raise the Knock Threshold to 75 when re-mapping my PFC a couple of weeks ago.

As mines not doing it under "balls out" acceleration, i dont think its anything to worry about...

Cheers
Jon