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Author Topic: GM 2.0DTi lacking power  (Read 9558 times)

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Marks DTM Calib

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Re: GM 2.0DTi lacking power
« Reply #30 on: 18 March 2014, 19:05:36 »

when was the last time the inlet manifold/swirl flaps cleaned out, i found it made a huge difference to mine when it was cleaned , messy job but well worth it to get the power back and helped reduce turbo lag a bit.
Probably never. TIS implies that the pump has to be bled with KM948 once the injection pipes have been off, which means its not something I can currently do.

Not needed.

Idealy you would have a priming bulb in the fuel filter fuel feed line but, you simply crack the high pressure injector pipes and crank for short intervals with half plus throttle applied until you see fuel from the lines. Then nip up and away you go.
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Marks DTM Calib

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Re: GM 2.0DTi lacking power
« Reply #31 on: 18 March 2014, 19:07:27 »

With the swirl flaps activated, the engine won't rev beyond about 2k, it just misses as if its running on 3, and belches smoke. Not sure why this would be, as the inlet air should be fast enough by that rpm for the extra inlet valve to work  :-\

Interesting, I cant recall if activated is 12V mode or 16V mode. If 12V mode then it makes sense as the air is very restricted.

That might tell us a story though......as it sounds like something is limiting the air input......somewhere.
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anddyy88

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Re: GM 2.0DTi lacking power
« Reply #32 on: 18 March 2014, 19:10:04 »

when was the last time the inlet manifold/swirl flaps cleaned out, i found it made a huge difference to mine when it was cleaned , messy job but well worth it to get the power back and helped reduce turbo lag a bit.
Probably never. TIS implies that the pump has to be bled with KM948 once the injection pipes have been off, which means its not something I can currently do.

yea has to be bled only need a a priming tool
one of these http://www.screwfix.com/p/laser-diesel-fuel-pump-priming-tool-8mm-5-16/77865
and a video of how to do it, on a vectra but same way to bleed
http://vimeo.com/52381811
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anddyy88

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Re: GM 2.0DTi lacking power
« Reply #33 on: 18 March 2014, 19:11:42 »

when was the last time the inlet manifold/swirl flaps cleaned out, i found it made a huge difference to mine when it was cleaned , messy job but well worth it to get the power back and helped reduce turbo lag a bit.
Probably never. TIS implies that the pump has to be bled with KM948 once the injection pipes have been off, which means its not something I can currently do.

Not needed.

Idealy you would have a priming bulb in the fuel filter fuel feed line but, you simply crack the high pressure injector pipes and crank for short intervals with half plus throttle applied until you see fuel from the lines. Then nip up and away you go.

ive tried this way on 3 different cars with the dti engine and cracking the high pressure pipes never seems to work for me
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Marks DTM Calib

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Re: GM 2.0DTi lacking power
« Reply #34 on: 18 March 2014, 19:20:16 »

when was the last time the inlet manifold/swirl flaps cleaned out, i found it made a huge difference to mine when it was cleaned , messy job but well worth it to get the power back and helped reduce turbo lag a bit.
Probably never. TIS implies that the pump has to be bled with KM948 once the injection pipes have been off, which means its not something I can currently do.

Not needed.

Idealy you would have a priming bulb in the fuel filter fuel feed line but, you simply crack the high pressure injector pipes and crank for short intervals with half plus throttle applied until you see fuel from the lines. Then nip up and away you go.

ive tried this way on 3 different cars with the dti engine and cracking the high pressure pipes never seems to work for me

Interesting, never failed for me as long as its only the high pressure lines you touch.

If you touch the pump feeds or drain the pump then its a big issue
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TheBoy

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Re: GM 2.0DTi lacking power
« Reply #35 on: 18 March 2014, 19:20:23 »

when was the last time the inlet manifold/swirl flaps cleaned out, i found it made a huge difference to mine when it was cleaned , messy job but well worth it to get the power back and helped reduce turbo lag a bit.
Probably never. TIS implies that the pump has to be bled with KM948 once the injection pipes have been off, which means its not something I can currently do.

Not needed.

Idealy you would have a priming bulb in the fuel filter fuel feed line but, you simply crack the high pressure injector pipes and crank for short intervals with half plus throttle applied until you see fuel from the lines. Then nip up and away you go.
At the injector end? That's how TIS suggests bleeding Omega TDs.

Lots of scare stories on tinterweb about shagging VP44 pumps by not properly bleeding.

Worth changing leak-offs as a matter of course anyway. I can probably pick up leak-off for a quid or 2 per meter, and suspect 1m would be enough?
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anddyy88

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Re: GM 2.0DTi lacking power
« Reply #36 on: 18 March 2014, 19:30:44 »

I got a meter length off vauxhall and had plenty left over, if your changing leak offs get new tee peices as there very brittle even new.

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martin42

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Re: GM 2.0DTi lacking power
« Reply #37 on: 18 March 2014, 20:13:34 »

If you want a hand at the weekend tb let me know :y
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TheBoy

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Re: GM 2.0DTi lacking power
« Reply #38 on: 18 March 2014, 20:39:52 »

If you want a hand at the weekend tb let me know :y
At the weekend, if the bastard works, it will be one a 200 mile trip up north for a week.  Butt cheeks will be clenched more than when Gixer is around ;D
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Marks DTM Calib

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Re: GM 2.0DTi lacking power
« Reply #39 on: 18 March 2014, 20:47:28 »

Get yourself a priming bulb ordered for fitting to make bleeding much easier (and vastly reduces drain back to the tank)
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Andy H

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Re: GM 2.0DTi lacking power
« Reply #40 on: 18 March 2014, 20:59:31 »

As we now know the Turbo is boosting (at least without load) well, I would be checking:

1) All solenoids by bypassing them all at the same time (thought being that if a single solenoid is faulty or leaking vac, it would not show up on the test we did but might affect the operation is a second is then enabled). This probably requries the turbo and swirl flaps actuators needing a direct supply and the EGR getting no supply.

2) Intercooler to inlet pipe - its the only one we didn't remove so wants checking, I would also liked to have removed and pressure tested the intercooler but as you know, it would not come out easily.
If it is a pain to get at then you just know it has to be the culprit.............. (only I think you will find it is partially blocked rather than leaking.)
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"Deja Moo - The feeling that you've heard this bull somewhere before."

TheBoy

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Re: GM 2.0DTi lacking power
« Reply #41 on: 18 March 2014, 21:15:09 »

Get yourself a priming bulb ordered for fitting to make bleeding much easier (and vastly reduces drain back to the tank)
None of the ShitFix around here have that one mentioned earlier in stock. Should I not attempt swirl flap clean before I go away, or do it and hope it will bled by cracking the pipe at the injectors?
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TheBoy

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Re: GM 2.0DTi lacking power
« Reply #42 on: 30 March 2014, 14:02:34 »

The thing behaved (albeit it with far less than the claimed 100bhp) impeccably on holiday in Yorkshire. Some of the hills were, errr, "challenging", but otherwise no issues.

Driving home, the EML kept popping on. Fuel in it at the time was Esso, though doubt that makes a difference.  Only thing I can think of was it was much warmer than it had been all week, as Spring had arrived ;D

Only other thing, given Yorkshire has no dual carriageways or motorways, it barely went above 50-60mph all week up there. Once on the motorway network coming home, ramming speed was reached.
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TheBoy

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Re: GM 2.0DTi lacking power
« Reply #43 on: 30 March 2014, 14:03:45 »

Also, coming home it was fully laden with 4 adults and a bootload of luggage, so would be under more load
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martin42

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Re: GM 2.0DTi lacking power
« Reply #44 on: 30 March 2014, 14:08:06 »

Give it some millers diesel additive,used to use it in my dti and did help  :y
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