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Gtir Motorsport club » Tech room » Help and Advice » I'm stumped!

I'm stumped!

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1 I'm stumped! on 15th August 2016, 6:40 pm

Stu

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Thought I would start a new thread so I can get some new ideas maybe.
I have replaced all the sensors in the engine bay.
Changed the afm and cleaned the iddle control valve.
Had new plugs and gapped to 0.7.
New leads. Rotor arm and dizzy cap.
New coil.
New ignition amp.
Changed the relocation pipe for a good quality hiteq one.
Heres the readings from the data scan.


The car drives great through the gears and boosts fine.
But when im in 4th at 2k rpm it's like its miss firing ever so slightly.
Same in 3rd gear at 2k rpm.
If I'm parked up and raise the revs and hold them at 2k rpm you can feel it slightly missing.
What else should I try/swap?
I'm stumped now. Really don't know what to try next.
Its also had a new battery and starter motor.
And a new gasket on the inlet manifold.
New gasket. Studs and nuts on the exhaust manifold too.


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2 Re: I'm stumped! on 15th August 2016, 7:32 pm

mc_hawkings24


Knock sensor?

3 Re: I'm stumped! on 15th August 2016, 8:52 pm

buckym120

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You would see the timing change i would have thought if it was detecting knock

4 Re: I'm stumped! on 15th August 2016, 8:55 pm

Gtirchris


Do you have any vacuum leaks mate?,  have you checked the dump valve for leaks?, engine main earth and engine loom earth's ok?, e.g no high resistance?,  is the resistor pack for the injectors ok?, is the distributor itself ok, e.g. the wiring to and from it, is the rotor arm screw tight?,  just a few things to consider fella.

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5 Re: I'm stumped! on 15th August 2016, 8:57 pm

Gtirchris


Also check fuel pressure, is the fuel pump ok, and also the pickup / strainer.

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6 Re: I'm stumped! on 15th August 2016, 9:01 pm

shroom

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Yeah as people have said maybe try blocking off your dump valve Stu I had very simular symptoms when I fitted a hks one ages ago.

Also sorry I thumbled and have gave a negative rep to bucky any change someone can sort it? Dont know how it happened bloody phone

7 Re: I'm stumped! on 15th August 2016, 9:08 pm

Stu

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Thanks for the replies Smile
I have checked and and replaced vacuum hoses. Also re piped them up properly.
I have removed the dump valve. So don't have one on.
No fault code for det sensor so guess that's okay.
I havent checked the fuel pump but the car drives fine under load and on boost so wouldnt have thought the fuel pump was the fault?
Its had a new fuel filter too.
I havent checked the injector resistor but I did swap it over about 6 months ths ago to try and sort this issue then. With no joy.
I will get another fpr and see if that does anything.
I have given a rep point to equal out Tom thumbling lol
Thanks again guys I now have a few more things to try and to change Smile
More money to throw at the shit heap lol


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8 Re: I'm stumped! on 15th August 2016, 9:40 pm

mc_hawkings24


Check your injector wiring with noid lights then how about chucking it on a rolling road but would cost abit

9 Re: I'm stumped! on 15th August 2016, 11:28 pm

GTI-R US

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Bring it down to me for half a day Stu and il sort it out no problem

Before you do that though couple mechanical things to check
1 valve / shim clearances
2 possible badly worn cam profile

Assuming they are ok and compressions are all good then it would help if you knew what the afr's were doing so do you have a wideband fitted?
If not then as said pop it down and will find the prob for you if you like


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10 Re: I'm stumped! on 16th August 2016, 10:57 am

Stu

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GTI-R US wrote:Bring it down to me for half a day Stu and il sort it out no problem

Before you do that though couple mechanical things to check
1 valve / shim clearances
2 possible badly worn cam profile

Assuming they are ok and compressions are all good then it would help if you knew what the afr's were doing so do you have a wideband fitted?
If not  then as said pop it down and will find the prob for you if you like
Thanks Bob.
I will grab my brothers compression tester and give that a try. As for the cam and shims I'm not sure how to check those out.
This car has made me paranoid to drive long distance Sad for fear of it overheating. I have done 2 x 50 mile round trips since replacing the radiator and hoses and all was good tho.
I have the kids off school atm so will get them back to school and come over for a day Bob. Thanks mate.


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11 Re: I'm stumped! on 16th August 2016, 12:08 pm

Cosmic73

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cam clearance is just sliding a feeler gage between the cam lobe and the rocker arm,
if the cams removed you could also do a quick check of the cam lobe heights with a vernier or micrometer,  Very Happy

12 Re: I'm stumped! on 16th August 2016, 4:03 pm

Stu

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Thanks Neil. I have feeler gauges so will give that a go one of the days.


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13 Re: I'm stumped! on 16th August 2016, 4:20 pm

Mr B

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gtir technician
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What's status of o2 sensor ... carbon canister ....

14 Re: I'm stumped! on 16th August 2016, 7:28 pm

buckym120

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Oi Tom you shit, dont miss thumb me again!!

Cheers stu  Basketball

15 Re: I'm stumped! on 16th August 2016, 8:18 pm

Stu

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Mr B wrote:What's status of o2 sensor ... carbon canister ....
02 sensor reading was all over the place when the issue was happening so I disconnected it but it didn't make any difference.
Carbon canister has also been changed for a good one.


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16 Re: I'm stumped! on 16th August 2016, 9:43 pm

Gtirchris


Also check the tps is working as it should, worth checking the throttle bodies are all set correctly and that the vacuum readings are equal so you know each cylinder is getting the correct amount of air.

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17 Re: I'm stumped! on 17th August 2016, 7:48 am

Cosmic73

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I thought we all removed our carbon canisters and blanked off the vac pipe? Suspect

18 Re: I'm stumped! on 17th August 2016, 9:46 am

gtir_woody

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Cosmic73 wrote:I thought we all removed our carbon canisters and blanked off the vac pipe? Suspect

Of course not, every R owner leaves it in Laughing

19 Re: I'm stumped! on 17th August 2016, 11:16 am

Cosmic73

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gtir_woody wrote:
Cosmic73 wrote:I thought we all removed our carbon canisters and blanked off the vac pipe? Suspect

Of course not, every R owner leaves it in Laughing

Shit, seriously?? Shocked
glad i kept mine, ill have to reconnect it, Embarassed

20 Re: I'm stumped! on 17th August 2016, 12:10 pm

shroom

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No you dont need to have it although if you have it and its not working correctly it will cause problems :-) dont panic mr cosmic x

21 Re: I'm stumped! on 17th August 2016, 12:14 pm

shroom

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buckym120 wrote:Oi Tom you shit, dont miss thumb me again!!

Cheers stu  Basketball

Sorry governor I wont do it again

22 Re: I'm stumped! on 17th August 2016, 12:19 pm

shroom

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I actually read an article recently which invoolved some studies into intermittent faults at various rpms in a range of performance cars, subarus, evos, various Nissans and Toyotas as well as Hondas. The study found that 89% of the issues were reported by people over 40 years of age, they found that a part of the brain called the chickengland starts to grow when you age and it sees a momentary twitch of the right leg causing the driver to pull off the gas when coming onto boost. I feel that the car may not be at fault here but it might be Stus over active chickengland causing the issue as he comes on boost.

Stu I believe you can fix this with a course of meditation and relaxaction coupled with a good dose of re energising yoyr balls. Rev the nuts of it and stop worrying

23 Re: I'm stumped! on 17th August 2016, 3:12 pm

Cosmic73

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shroom wrote:I actually read an article recently which invoolved some studies into intermittent faults at various rpms in a range of performance cars, subarus, evos, various Nissans and Toyotas as well as Hondas. The study found that 89% of the issues were reported by people over 40 years of age, they found that a part of the brain called the chickengland starts to grow when you age and it sees a momentary twitch of the right leg causing the driver to pull off the gas when coming onto boost. I feel that the car may not be at fault here but it might be Stus over active chickengland causing the issue as he comes on boost.

Stu I believe you can fix this with a course of meditation and relaxaction coupled with a good dose of re energising yoyr balls. Rev the nuts of it and stop worrying

 yoursofunny fantastic, i give you a rep point that Laughing Laughing

24 Re: I'm stumped! on 17th August 2016, 5:05 pm

Stu

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Admin
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shroom wrote:I actually read an article recently which invoolved some studies into intermittent faults at various rpms in a range of performance cars, subarus, evos, various Nissans and Toyotas as well as Hondas. The study found that 89% of the issues were reported by people over 40 years of age, they found that a part of the brain called the chickengland starts to grow when you age and it sees a momentary twitch of the right leg causing the driver to pull off the gas when coming onto boost. I feel that the car may not be at fault here but it might be Stus over active chickengland causing the issue as he comes on boost.

Stu I believe you can fix this with a course of meditation and relaxaction coupled with a good dose of re energising yoyr balls. Rev the nuts of it and stop worrying

Lmfao thanks for helping find the issue Smile Laughing
I will remember NOT to ask you in the future Laughing

I have noticed a random wire coming off the plug of the coil :/ I havent traced it back yet. Why would someone take a feed from the coil? Rev counter or something? Or would that be from the dizzy?

My revs are back to dropping off again while on idle so im going to take the idle control valve off and replace it.


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25 Re: I'm stumped! on 17th August 2016, 5:52 pm

Stu

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Just traced the wire from coil to the back of the obd1 plug. Wires not attatched to anything and left bare. And on the same loom it was taking a live and earth from the back of the obd1 plug :/
Pulled the ecu out and there was another random loom just clipped off and left :/
So I have removed them and tidied it up and taped the wires to re insulate them.
I need to get some shrink tubes and cut and re solder the wires and then heat shrink the tubes over the soldered parts. A job for another day that tho.
Atleast I don't have a random wire in the engine bay now lol


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