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Gtir Motorsport club » Tech room » Help and Advice » Misfire on load/boost

Misfire on load/boost

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pulsarmoley
Gostek
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1Misfire on load/boost Empty Misfire on load/boost 27th October 2014, 7:42 pm

Gostek

Gostek
Events Organiser
Events Organiser

So as title says my beast developed some sort of misfire when going on full load is ok when i'm on 1/3 throttle but more than that and it's sound like subaru or antilag....
I don't know if fact that 2 days ago i've changed exhaust to 3" car ran till last night.
I've checked plugs, leads, cleaned dizzy, pressurized intake (no leaks) and i've drained fuel+ changed fuel filter as it happened about 10 miles after some fuel top up but no changes
So i would be glad if some one could point me in some direction
Bay the way car runs standard boost, ecu, maf and i haven't checked for codes but there is no eml

Thanks Mike

https://bbmgarage.co.uk/

2Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 7:53 pm

pulsarmoley

pulsarmoley
moderator
moderator

When you cleaned dizzy, did you check your rotor arm? The grub screw on mine came loose once and caused a similar issue.


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3Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 7:59 pm

Gostek

Gostek
Events Organiser
Events Organiser

It was tight...


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4Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:03 pm

pulsarmoley

pulsarmoley
moderator
moderator

I reckon next job is to do a fault code check then


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Natural selection does not work quick enough  Evil or Very Mad

Everybody needs a bosom for a pillow...

5Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:05 pm

Gostek

Gostek
Events Organiser
Events Organiser

I'm looking for something to make bridge right now lol

https://bbmgarage.co.uk/

6Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:06 pm

johnny gtir

johnny gtir
moderator
moderator

Checked plugs ? Or changed them. Fuel starve ie pump starting to play up ? Damp or wet in maf ?

7Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:20 pm

Gostek

Gostek
Events Organiser
Events Organiser

Only checked them they looked ok to me but i'll just change the tomorrow i haven't looked at maf yet and i haven't got fuel pressure gauge and no idea what fuel pump i've got,
Just checked fault codes and it shows 55...


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https://bbmgarage.co.uk/

8Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:39 pm

nomad

nomad
Admin
Admin

55 is all good .... i would change plugs plus cheapish fix if its that ...


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9Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 8:52 pm

Gostek

Gostek
Events Organiser
Events Organiser

Just checked maf and it's dry and looks ok although i don't know if pulsar maf dies suddenly or breaks up like audi etc and gives wrong reading but not showing any fault
Well i'll change plugs tomorrow and pray that will help...


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https://bbmgarage.co.uk/

10Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:06 pm

johnny gtir

johnny gtir
moderator
moderator

No cracks in dizzy cap ?

11Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:15 pm

Gostek

Gostek
Events Organiser
Events Organiser

Didn't find any... I'm just reading stuff on other forums and ppl saying something about fuel pumps and mafs i'll check feed to pump tomorrow but no idea about maf i know i can check voltage from signal wire etc but no idea about any resistance... Will pulsar run without maf ie in limp mode or just won't start?



Last edited by Gostek on 27th October 2014, 9:28 pm; edited 1 time in total

https://bbmgarage.co.uk/

12Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:19 pm

nomad

nomad
Admin
Admin

Is there any loss in power .... did you change the whole  exhaust system ... was wondering about vibration from the exhaust ???? Also check battery connection if your still running battery at the front think i remember a member on here who had similar problem wich turned out to be the live connection just after the terminal ...


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13Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:27 pm

Gostek

Gostek
Events Organiser
Events Organiser

Well i'm not sure about loss of powe as i won't boot it with fault like that... if i'll feather it seems to bee boosting exhaust is am performance elbow+downpipe(with screamer) rest is 5zigen pro racer. Car ran fine with it for 2 days... I've checked them 2 small connectors right from battery and they look ok i'll recheck them and clean them tomorrow again but it just strange as car starts and idles ok if i keep it off boost it's ok as well. I've changed lambda as well as i've had one kicking around...


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https://bbmgarage.co.uk/

14Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:53 pm

GTI-R US

GTI-R US
Management
Management

I reckon it's an afm fault going by symptoms your describing doesn't always come up as a code
Check the earth to plug and take a separate Earth to body ground and clean connections.
If plugs are all ok that's the next thing I would suspect


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Services provided

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Body Restoration, Fabrication, Repair
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15Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 9:55 pm

Gostek

Gostek
Events Organiser
Events Organiser

i've got extra earth already on... is maf a common fault on them then?? Oh and have you got any in stock?


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16Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 10:07 pm

GTI-R US

GTI-R US
Management
Management

Very very common fault and exact symptoms your describing

Yes have a known good one in if needed


_________________
GTI-R-US.co.uk
 In association with
Torque Of The South Motorsport

Nissan Performance & Tuning Centre
Services provided

Forge Engine rebuilds to specification
Body Restoration, Fabrication, Repair
Paint refinishing facilities
Ecu re-mapping-Performance upgrades
Auto Diagnostics, Injector cleaning  
Race & Suspension setup
General Servicing, Mots, tyre fitting
Full workshop facilities
http://www.gti-r-us.co.uk www.force500.com

17Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 10:09 pm

Gostek

Gostek
Events Organiser
Events Organiser

Ok could you pm me with price and would you have any walbro kicking around if yes i would take both


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https://bbmgarage.co.uk/

18Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 10:15 pm

GTI-R US

GTI-R US
Management
Management

Il check tomorrow for you fella to see if we have one as had a lot of stuff nicked recently
If so il pm you


_________________
GTI-R-US.co.uk
 In association with
Torque Of The South Motorsport

Nissan Performance & Tuning Centre
Services provided

Forge Engine rebuilds to specification
Body Restoration, Fabrication, Repair
Paint refinishing facilities
Ecu re-mapping-Performance upgrades
Auto Diagnostics, Injector cleaning  
Race & Suspension setup
General Servicing, Mots, tyre fitting
Full workshop facilities
http://www.gti-r-us.co.uk www.force500.com

19Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 10:17 pm

Gostek

Gostek
Events Organiser
Events Organiser

Thanks a lot Bob


_________________

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20Misfire on load/boost Empty Re: Misfire on load/boost 27th October 2014, 11:02 pm

GTI-R US

GTI-R US
Management
Management

No problemo


_________________
GTI-R-US.co.uk
 In association with
Torque Of The South Motorsport

Nissan Performance & Tuning Centre
Services provided

Forge Engine rebuilds to specification
Body Restoration, Fabrication, Repair
Paint refinishing facilities
Ecu re-mapping-Performance upgrades
Auto Diagnostics, Injector cleaning  
Race & Suspension setup
General Servicing, Mots, tyre fitting
Full workshop facilities
http://www.gti-r-us.co.uk www.force500.com

21Misfire on load/boost Empty Re: Misfire on load/boost 31st October 2014, 6:59 pm

Gostek

Gostek
Events Organiser
Events Organiser

Small update...I've got today new plugs and maf from Bob and bastard thing is still partially there... 1st gear no probs on 2nd and 3rd gear is between 2,5k-4k rpm after that car drives ok 4th and 5th gear is there after 2.5k but small lift off and then boot again and it goes... I've still got walbro to fit and we'll see from there


_________________

https://bbmgarage.co.uk/

22Misfire on load/boost Empty Re: Misfire on load/boost 31st October 2014, 9:52 pm

gtirnick



i've had the power transistor on mine act up that gave me stutter symptoms

i unbolted it from the mount on block and mounted it away from the motor and strapped an old ecu heat sink with some thermal paste.

but i'd start with the fuel pump since you have one u can fit

23Misfire on load/boost Empty Re: Misfire on load/boost 31st October 2014, 10:22 pm

Gostek

Gostek
Events Organiser
Events Organiser

Well that's the plan rule out easiest symptoms


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24Misfire on load/boost Empty Re: Misfire on load/boost 2nd November 2014, 7:55 pm

Gostek

Gostek
Events Organiser
Events Organiser

So today i've changed fuel pump dizzy cap ht leads and coil and it runs sweet again so it had to be one of those thongs only don't know which one lol


_________________

https://bbmgarage.co.uk/

25Misfire on load/boost Empty Re: Misfire on load/boost 2nd November 2014, 9:04 pm

nomad

nomad
Admin
Admin

One of those thongs Razz .... least you got to the bottom of it Wink


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