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Gtir Motorsport club » Tech room » Help and Advice » Misfire

Misfire

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1Misfire Empty Misfire on 11th April 2015, 9:22 pm

scotty6860

scotty6860
Got my car out today had the new quaffie box fitted and str brace and done a full oil service on everything took it out for a drive if you build the boost up its fine but when you floor it and the cams kick in and the turbo getting a misfire I am going to change the plugs and check dizzy on the conetion for the air flow in to the maf is there ment to be a earth wire on there



Last edited by scotty6860 on 11th April 2015, 9:28 pm; edited 1 time in total (Reason for editing : Being a mong)

2Misfire Empty Re: Misfire on 11th April 2015, 9:25 pm

Bones

Bones
the two star club
the two star club
Run it at night and look for any arcing off the ht leads etc, I had that once and took me ages to find it, or better still change the leads if you have a spare set

3Misfire Empty Re: Misfire on 11th April 2015, 9:30 pm

scotty6860

scotty6860
Ok will do that just replace the lot Need to get it sorted for the rr day at bobs

4Misfire Empty Re: Misfire on 11th April 2015, 9:35 pm

johnny gtir

johnny gtir
moderator
moderator
How long has it sat ? What plugs you running ? Don't go changing everything at once best to know which component was causing it

5Misfire Empty Re: Misfire on 11th April 2015, 9:46 pm

scotty6860

scotty6860
Been sat for about 8 months but got a fresh fuel in it I have noticed the cable coming of the  plug for the maf does look like a earth lead

6Misfire Empty Re: Misfire on 12th April 2015, 5:40 am

johnny gtir

johnny gtir
moderator
moderator
Plugs i would say
What plugs you running ?

7Misfire Empty Re: Misfire on 12th April 2015, 7:30 am

scotty6860

scotty6860
All going to come out today and be checked not sure what's in there

8Misfire Empty Re: Misfire on 12th April 2015, 7:13 pm

scotty6860

scotty6860
Right misfire sorted was the plugs but now it's come up with a new one car is going like shit of a shovel on boost no smoke but on low revs when I let of I am getting white smoke

9Misfire Empty Re: Misfire on 12th April 2015, 7:20 pm

PartyPete

PartyPete
the one star club
the one star club
Isn't white smoke moisture, I.e water....? Have you checked the water levels in the rad?

10Misfire Empty Re: Misfire on 12th April 2015, 7:26 pm

pulsar23


Has the head gasket been changed?

11Misfire Empty Re: Misfire on 12th April 2015, 7:31 pm

scotty6860

scotty6860
Just had a brand new rad put on it just been out to car took about a pint of water but xpasion bottle has some in it up to full mark and just checked dip stick and oil filler cap for milk none on there it's only done about 4000 miles since a full rebuild

12Misfire Empty Re: Misfire on 12th April 2015, 7:35 pm

PartyPete

PartyPete
the one star club
the one star club
Keep an eye on your water level for sure, is your heater blowing hot air out?

13Misfire Empty Re: Misfire on 12th April 2015, 7:36 pm

scotty6860

scotty6860
Will get a compesion tester on it in the morning I think it's white smoke hard to tell when I am driving heater does blow sort of hot air

14Misfire Empty Re: Misfire on 12th April 2015, 7:46 pm

PartyPete

PartyPete
the one star club
the one star club
Sort of hot... Get that tester on it and let us know what it is. Is it around 150/160 psi on the cylinders that's a healthy engine? I May stand corrected??

15Misfire Empty Re: Misfire on 12th April 2015, 7:52 pm

scotty6860

scotty6860
It's never been the best heater since I have owned the car but only use it in the Summer will put test results up tomorrow and keep my fingers crossed

16Misfire Empty Re: Misfire on 12th April 2015, 8:16 pm

Bones

Bones
the two star club
the two star club
Pete's right, look for about 150/160 across all four and keep an eye on the water levels

17Misfire Empty Re: Misfire on 12th April 2015, 10:00 pm

GTI-R US

GTI-R US
Management
Management
You can't say what compressions will be as it may be a low compression build in which case they may be down on figures quoted.
The main thing is that there's a balance across all 4

If the header tank is full it maybe a few things Scott
1 sticky thermostat
2 weak rad cap releasing pressure, try a 1.3 bar cap
3 turbo problem (you say it seems faster, is there an over boost prob)?
4 blow in head gasket between cylinders or cylinder and waterway

Check out the simple things first


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18Misfire Empty Re: Misfire on 12th April 2015, 10:05 pm

pulsar23


My tank fills up too but don't think I have seen white stuff

19Misfire Empty Re: Misfire on 12th April 2015, 10:17 pm

scotty6860

scotty6860
LIt's got a brand new mishimoto rad on with a 1.3 bar cap I will pull thermostat out in the morning as car did sit for a while it does smell a lot richer than it used to be just get all the other stuff checked before I put it in for a remap

20Misfire Empty Re: Misfire on 13th April 2015, 6:45 pm

scotty6860

scotty6860
So after a day of checks and calls to bob it seems as if my arp head bolts are wank and the cylinder head is lifting as compesion was down loads on all 4 and coolant is getting in to the exhaust so in the morning it's new head bolts in and keep fingers crossed once again thanks for all the help bob

21Misfire Empty Re: Misfire on 13th April 2015, 7:05 pm

johnny gtir

johnny gtir
moderator
moderator
They are that the head bolts

22Misfire Empty Re: Misfire on 13th April 2015, 7:45 pm

nomad

nomad
Admin
Admin
I thought stock head bolts were best used over the arp ones ....


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23Misfire Empty Re: Misfire on 13th April 2015, 10:18 pm

GTI-R US

GTI-R US
Management
Management
He has arp head bolts fitted already when engine was built.

They have now let go as it appears the head has lifted (state normal with the arp head studs)
So I've advised him to try and remove one by one and replace with stock head bolts and if he's lucky he may get away without changing the head gasket unless of course it has burnt across to waterways in which case head gasket will need replacing

So fingers crossed for him


_________________
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

24Misfire Empty Re: Misfire on 13th April 2015, 10:43 pm

nomad

nomad
Admin
Admin
Fingers crossed for you then fella ....


_________________
"Official post whore" and all round superhero....

25Misfire Empty Re: Misfire on 13th April 2015, 10:46 pm

scotty6860

scotty6860
Cheers will have every thing crossed Tom if not I got some late nights before sataday

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