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Gtir Motorsport club » Tech room » Help and Advice » loss of compression/power

loss of compression/power

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26 Re: loss of compression/power on 6th December 2015, 9:05 pm

Gtirchris


Hmm, you would expect it to stutter if it was a fueling issue, but having said that it could well be a dodgy pump, especially if it has been sat for a few years as the pump may have corroded internally, try a new pump and filter, easy and most likely things first and all that mate.

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27 Re: loss of compression/power on 6th December 2015, 9:20 pm

luke s


Mike remember when the hose was off the fuel regulator it wouldn't pull maybe something like that?

28 Re: loss of compression/power on 6th December 2015, 9:22 pm

Gostek

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Hoses are routed bit different now and it wouldn't play up after 20 miles only straight away...


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29 Re: loss of compression/power on 6th December 2015, 9:26 pm

Gostek

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Gtirchris wrote:Hmm, you would expect it to stutter if it was a fueling issue, but having said that it could well be a dodgy pump, especially if it has been sat for a few years as the pump may have corroded internally, try a new pump and filter, easy and most likely things first and all that mate.

There is new filter on it and I'm thinking to suggest pump and I'd do straight feed from battery to pump (with all the relays obviously) and honestly don't know if it stutters cos bloody thing always run fine when I'm in it fuming duh

30 Re: loss of compression/power on 7th December 2015, 9:41 am

wrc

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My first bet would be ignition amplifier breaking down under heat. All my gtir's I have put some thermal paste and a heat sink on them.

31 Re: loss of compression/power on 7th December 2015, 10:57 am

johnny gtir

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Just asking was the bottom end all ok seems to me something tightening up. I think all the above would cause issues sooner than 20 min 40 min drives

32 Re: loss of compression/power on 7th December 2015, 11:53 am

GTI-R US

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yeah agree with above

sounds to me as though some clearances may be slightly out with bottom end and engines getting tight when hot (just a possibility)
once it gets hot and the problem starts if you turn the engine off does it immediately start (crank over) at a normal rate or does it sound laboured when doing so?

Other thing it could be (if mis-fires are present when hot) is an ignition amplifier module overheating.

So depends on the above with regard to engine cranking speed when hot


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33 Re: loss of compression/power on 7th December 2015, 1:24 pm

Gostek

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Riiiight correction car runs ok but after some driving starts to play up when boost comes on (just been informed properly) and when it's playing up starts ok no struggle and it's smooth struggle no missing just no power after 3k rpm



Last edited by Gostek on 7th December 2015, 1:31 pm; edited 1 time in total (Reason for editing : Bloody phone)

34 Re: loss of compression/power on 7th December 2015, 11:38 pm

GTI-R US

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Dodgy maf


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35 Re: loss of compression/power on 7th December 2015, 11:45 pm

Gostek

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GTI-R US wrote:Dodgy maf
I've put known working one on (was on my car for 6 months) I'll see car again Saturday I'm gonna put boost gauge on it and drive around till it'll plays up...
I've put something on fb too (big mistake) and one guy came up with maf plug, need to check it too, and obviously infamous knock sensor which I've got no idea how to test scratch

36 Re: loss of compression/power on 7th December 2015, 11:56 pm

GTI-R US

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Knock sensor won't cause car to splutter and die at 3k but it will drop boost to around .6 bar and pull around 2 degrees out of ignition from mid range to wot which will cause the car to feel sluggish and gutless. Timing is advanced when engine is cold so won't be so noticeable with power loss

Best way to test it is to put + side of multimeter on the pos side of sensor and the other side to earth, set meter to ohms and you should have a reading of no less than 5.58 megaohms if it reads less then good bet that the knock sensors knackered



Last edited by GTI-R US on 8th December 2015, 12:01 am; edited 1 time in total


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37 Re: loss of compression/power on 8th December 2015, 12:00 am

Gostek

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I just love to chase intermittent faults  suicide I shall know some more Saturday...


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38 Re: loss of compression/power on 8th December 2015, 12:05 am

Gostek

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GTI-R US wrote:Knock sensor won't cause car to splutter and die at 3k but it will drop boost to around .6 bar and pull around 2 degrees out of ignition from mid range to wot which will cause the car to feel sluggish and gutless.
To be honest that's what happening apparently, but would this stop after 5 min of cool down?? So basicly I need to check resistance on sensor at it should be more than 5.58 M ohm

39 Re: loss of compression/power on 8th December 2015, 12:24 am

GTI-R US

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Yep that's it in a nut shell Mike

After a 5 minute cool down I doubt it would make any difference tbh but sometimes these cars don't work along the normal lines of logic so you need to think outside the box if you know what I mean.

As I said earlier, what would affect that after a 5 minute cool down would be an overheating ignition amplifier module so that would be my first port of call if the knock sensor is found to be all ok.

I take it you have done a code check and its come up all clear?


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40 Re: loss of compression/power on 8th December 2015, 6:08 am

Mr B

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Defo needs sorting & full check on rolling road once basic issues resolved as much as possible as small fuel & ignition issues could kill piston again ... if ignition & maf rule out then fuel delivery wants a look at, from initial problem it hints at fueling being bad . pump/relay can play up when work harder/get hot then some cooling resolves issue to some degree.

41 Re: loss of compression/power on 8th December 2015, 12:58 pm

Gostek

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I haven't checked fault memory cos as far as I know pulsar dont store not present dtcs(i might be wrong) nut will do Saturday and I'll stick my amplifier on see how it goes. Car defo need sorting out it would be a shame to blow it up after all work I've done on it...


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