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Hesitation and knocking from brakes

+4
GTI-R US
Stu
fred05
Digitalfaze
8 posters

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1Hesitation and knocking from brakes Empty Hesitation and knocking from brakes 11th September 2013, 9:31 am

Digitalfaze

Digitalfaze
web admin
web admin

Seem to have a little issue which im not sure where to start, when i put my foot down i get various slight hesitations throughout the rev range, more so when im sitting on half throttle and accellerate it instantly feels like there aint enough fuel to get it going for a second, then it boosts and then the slight hesitation again.

Also when i changed my rear pads my car developed the crazy knocking when braking, figured it was the rear caliper as it was a bit sticky so i replaced it and now the problem seems to be worse and alot worse when at higher speeds. i get alot of feedback through the pedal and im unsure if it is front are back, dont think rear would give this much feedback? i checked the front discs and they seem to be ok and the car doesnt pull to the side when braking so im pretty lost, anyone have any ideas before i start replacing everything and taking to a brake specialist? abs maybe???

dont really know where to begin with this stuff Sad.

http://www.avaloncreative.co.uk

2Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 10:01 am

fred05

fred05
french connection
french connection

are your rear disc in good condition? maybe they are bent...causing the knock...

did you get a fault check?

3Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 10:33 am

Stu

Stu
Admin
Admin

Check the vacume pipe on fpr isn't split or perforated.
Check if plug gap is 0.7. and rotor arm and dizzy cap are ok.
Could be leads aswel.
Or ign amp.

http://www.j10-meets.co.uk

4Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 11:54 am

Digitalfaze

Digitalfaze
web admin
web admin

Stu wrote:Check the vacume pipe on fpr isn't split or perforated.
Check if plug gap is 0.7. and rotor arm and dizzy cap are ok.
Could be leads aswel.
Or ign amp.
yeah dizzy and rotor are only a few months old, maybe change the leads as they magnecor reds and the plugs i checked a while ago and they were 0.8 from what i thought? might explain the popping i get when driving normal?

Not sure if the ropy idle and black smoke could be related to this but that seems to have stopped then the hesitation started

the rear discs are rather dead but i didnt think rears would cause much knocking as they dont use full braking force?

Cheers for the reply guys

http://www.avaloncreative.co.uk

5Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 5:39 pm

GTI-R US

GTI-R US
Management
Management

sort one problem out first then move onto the other as easier that way!

hesitation could be either an ignition or fuelling problem so youll need to check everything to diagnose what the prob could be
very difficult to say its one particular thing as could be anything
first thing I would do is a faultcode check to make sure theres no codes coming up.
then assuming alls ok renew cheap things such as plugs and fuel filter then if probs still there you need to start looking a little more deeply

http://www.gti-r-us.co.uk www.force500.com

6Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 5:53 pm

pulsarmoley

pulsarmoley
moderator
moderator

I had a hesitation years ago and it would boost then hesitate again, drove like you were on kangaroo petrol. Turned out the grub screw on the rotor arm had worked loose and it was constantly changing the ignition timing; just a possibility.

7Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 8:43 pm

Digitalfaze

Digitalfaze
web admin
web admin

ok thanks guys, ill get a fuel filter, plugs and leads and see if they help and run a fault check tomorrow

http://www.avaloncreative.co.uk

8Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 11th September 2013, 10:48 pm

danr

danr

standard maf? tuned?

9Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 8:12 am

Digitalfaze

Digitalfaze
web admin
web admin

yeah pretty much standard car bar mongoose exhaust, air filter and fmic

http://www.avaloncreative.co.uk

10Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 8:16 am

Stu

Stu
Admin
Admin

Try cleaning all earths up.
And maybe re earth the afm.

http://www.j10-meets.co.uk

11Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 8:27 am

Digitalfaze

Digitalfaze
web admin
web admin

afm is that just the maf yeah? ill get dirty with it this weekend and re-earth everything i can see, i take it the earths will just be going to the inner panels?

does anyone have a good site for decent ignition leads or will the ones from motor factors be sufficient enough?

http://www.avaloncreative.co.uk

12Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 8:43 am

Stu

Stu
Admin
Admin

Standard leads are best! Probs about £45 from Nissan?

Earths will be on plenum, down on body by the water bottle, on the thermostat housing and onto the battery and then down onto the body under battery tray.

Afm is maf yeah. Air flow meter-metered air flow Wink

http://www.j10-meets.co.uk

13Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 9:11 am

Digitalfaze

Digitalfaze
web admin
web admin

ok thanks ill get from nissan, something making me think its fuel as i ran out of fuel when one of the pipes burst so hopefully these little things will cure it

http://www.avaloncreative.co.uk

14Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 9:28 am

Stu

Stu
Admin
Admin

When did you last change the fuel filter?

http://www.j10-meets.co.uk

15Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 9:47 am

Digitalfaze

Digitalfaze
web admin
web admin

not changed it since i had the car so should be due a change anyway?

http://www.avaloncreative.co.uk

16Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 9:49 am

Stu

Stu
Admin
Admin

Yeah I would do that before anything else as its probs the cheapest. Think they are about £12 from Nissan.
Think Bob mentioned it earlier in the thread aswel.

http://www.j10-meets.co.uk

17Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 9:51 am

Stu

Stu
Admin
Admin

And the brakes knocking, did you put the anti squeel plates back in when you changed pads? Sounds like the pads are moving when braking.

http://www.j10-meets.co.uk

18Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 10:00 am

Digitalfaze

Digitalfaze
web admin
web admin

thing is there was no anti squeel pads in the brakes when i replaced the pads, only thing i noticed was the caliper piston was very hard to screw back in so i figured it was the caliper that was siezed.

i was told that the discs maybe warped but i dunno as sometimes when the brakes are cold the problem isnt there, i used some wd40 on the caliper piston before replacing it and tried to free it off a little and when i took it out to test the brakes worked fine for around 20mins of braking then problem back again so i dont think its a warped disc.

Fuel filter easy enough to replace myself?

http://www.avaloncreative.co.uk

19Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 10:23 am

Stu

Stu
Admin
Admin

Fuel filter is simple undo screws and take old one off and put new one on. It's the silver cylinder on bulk head.
Sounds like caliper needs a service.

http://www.j10-meets.co.uk

20Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 11:32 am

Digitalfaze

Digitalfaze
web admin
web admin

i replaced the caliper with one from bob but problem is worse so i thought it had to be something else.

thanks for your help its much appreciated

http://www.avaloncreative.co.uk

21Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 2:50 pm

GTI-R US

GTI-R US
Management
Management

if you ran low on fuel it may also be worth checking the gauze filter in the tank on the end of the pump as ive had this before where they get clogged up with oily type deposits and the pump struggles to suck the fuel up......youll soon be able to tell because if the filter sock is all sucked inwards then its a sure sign its blocked with oily type deposits.

as for the brakes
are the anti rattle shims fitted? if not they will rattle like mad every time you go over a bump, knock when you initially brake or go forwards and backwards

http://www.gti-r-us.co.uk www.force500.com

22Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 3:02 pm

Digitalfaze

Digitalfaze
web admin
web admin

GTI-R US wrote:if you ran low on fuel it may also be worth checking the gauze filter in the tank on the end of the pump as ive had this before where they get clogged up with oily type deposits and the pump struggles to suck the fuel up......youll soon be able to tell because if the filter sock is all sucked inwards then its a sure sign its blocked with oily type deposits.

as for the brakes
are the anti rattle shims fitted? if not they will rattle like mad every time you go over a bump, knock when you initially brake or go forwards and backwards
I am still yet to get my new pump fitted and after last time bursting a fuel pipe im a bit nervous about going there again, but i think this will be the final check will be puting it in for the fuel pump to be changed over and the wiring done, it does feel like a fuel surge when it happens.

yeah there is shims fitted to the calipers, no rattles when not braking and pads seem to be wearing down aswell but no wear to the actual disc, the are rusted quite a bit and figured the new pads would wear it away

http://www.avaloncreative.co.uk

23Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 10:36 pm

danr

danr

Water in the spark plug holes..
Check injector cables are clipped in..
If you clean the earths (doubt its these) dont move them elsewhere, especially the MAF!
Check battery terminals are tight on..
Is the burst fuel pipe fixed properly?

I'd go:

1. Check sock on fuel pump, check for water in plugholes, disconnect battery half hour, unplug ECU replug in (cant harm) cost == free
2. New Nissan Dizzy cap and rotor arm and fuel filter == £30'ish
3. Pint(s) of lager
4. New Nissan Plug leads £50'ish
5. New walbro fuel pump £55'ish

Brakes im clueless, abs?

Error codes done yet?

24Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 12th September 2013, 11:40 pm

Digitalfaze

Digitalfaze
web admin
web admin

not done the codes yet, the pipe was fixed by trimming it back and using a pipe connector, have a new fuel pump in the boot just gotta get the guy to fit it, dizzy and rotor was done around 1000miles ago ill have a bash at the rest of the stuff you mentioned this weekend,

can i remove the fuse for the abs to rule that out?

http://www.avaloncreative.co.uk

25Hesitation and knocking from brakes Empty Re: Hesitation and knocking from brakes 13th September 2013, 11:35 am

GTI-R US

GTI-R US
Management
Management

yes, fuse is in n/s inner wing plastic case near air filter

http://www.gti-r-us.co.uk www.force500.com

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