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Gtir Motorsport club » Tech room » Help and Advice » Missing / hesitating under any level of boost

Missing / hesitating under any level of boost

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1 Missing / hesitating under any level of boost on 24th November 2016, 1:15 pm

DRC

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On my way to work and the car started and drove great . It pulled fine and boosted with out concern . Half way to work and problems .
If I give it any more than 0.1 bar boost the car stutters , hesitate and won't progress up the rev range. It feels like a fueling issue but I could be wrong . I am yet to check under the bonnet in detail but I did not see any blown boost hoses or kinks .
And all plugs look like they are in place .

I will check the dizzy cap arm and coil later .

Any ideas and directions would be helpful . Thanks
Written whist stuck in stationery traffic.

Dan

2 Re: Missing / hesitating under any level of boost on 24th November 2016, 2:56 pm

DRC

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I removed the distributior
To find.......


This happened when I was at bobs. We found the other dizzy cap In similar condition I thought the bearings might of gone on the distributor. But after removing the distributor the bearings were tight I put it down to a kinked rubber gasket  between the distributor and Cap , this sat the cap at an offset along with it having cracks where the screws in and it had no guides, so maybe it could have worked loose ? I have no real idea what caused it. But it's now fixed . I will run it for a few days and re-check every thing is ok.



Last edited by DRC on 24th November 2016, 6:27 pm; edited 1 time in total

3 Re: Missing / hesitating under any level of boost on 24th November 2016, 4:04 pm

nomad

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Admin
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It must have some play in it when it gets hot to only wear done one side like its out of balance similar to when a turbo bearing goes ????


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4 Re: Missing / hesitating under any level of boost on 24th November 2016, 4:36 pm

DRC

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It's very odd as I have had it out and tested the bearings and they seem spot on.

So Just fitted a new distributor and cap as it looked like these caused the problem and........... no change !

It still holds out and spits and  hesitates at 0.2 bar .
( the above was a typo it's always been 0.2 bar)

So some sort of sensor or pipe leak?

So what should I look for next

5 Re: Missing / hesitating under any level of boost on 24th November 2016, 5:57 pm

mike74

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Have you pulled fault codes yet? Does it idle ok or does it feel a bit lumpy? My old one used to idle like it had race cams in it when even one small vacuum pipe came off so was easy to spot. Fuel pump recently replaced or original one?

6 Re: Missing / hesitating under any level of boost on 24th November 2016, 6:21 pm

DRC

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I have been on the phone to Bob trying things over the phone and whilst talking I notice the turbo outlet pipe had blown off! What an utter Twa* I am . How could I have missed it! Oh well. At least I hope to have solved another issue being the dizzy cap .

I'm shamed duh

7 Re: Missing / hesitating under any level of boost on 24th November 2016, 6:29 pm

DRC

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When it's been run and it's hot I will whip the cap off and see if there is any play in the bearings.

8 Re: Missing / hesitating under any level of boost on 24th November 2016, 6:44 pm

mike74

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Lol, it's happened to us all at some point. Glad it's an easy fix though Smile

9 Re: Missing / hesitating under any level of boost on 24th November 2016, 8:36 pm

nomad

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Does it look like the cap has melted on the side where its worn down .... just trying to get an understanding on how it only wears one side ball age


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10 Re: Missing / hesitating under any level of boost on 24th November 2016, 8:39 pm

nomad

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Are the leads getting hot as zooming in on the picture it looks like the cap is distorted behind the contacts ???


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11 Re: Missing / hesitating under any level of boost on 26th November 2016, 7:20 pm

DRC

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I have fitted a new cap and arm on the bench and there was no resistance .
I put the dizzy back and ran it for a few miles . Then removed the cap and everything looks fine .
I will run it for a few hundred miles and recheck .

I also bought and fitted a mikalor clamp on the turbo output so no more poping boost hoses!

12 Re: Missing / hesitating under any level of boost on 27th November 2016, 12:06 am

splmum

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@DRC wrote:I removed the distributior
To find.......


This happened when I was at bobs. We found the other dizzy cap In similar condition I thought the bearings might of gone on the distributor. But after removing the distributor the bearings were tight I put it down to a kinked rubber gasket  between the distributor and Cap , this sat the cap at an offset along with it having cracks where the screws in and it had no guides, so maybe it could have worked loose ? I have no real idea what caused it. But it's now fixed . I will run it for a few days and re-check every thing is ok.

Is that not the standard shape of the dizzy cap contacts.  I've read somewhere someone questioning this before, thinking their cap was knackered, when in actual fact that is how they are standard.
Check your old cap against the new one and see if there is any difference.

13 Re: Missing / hesitating under any level of boost on 27th November 2016, 1:54 am

Stu

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I blew a hose off last weekend while over taking a car. Felt like a right twat having to pull in right after over taking he car and then popping the bonnet to fix it ffs Laughing


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14 Re: Missing / hesitating under any level of boost on 27th November 2016, 9:22 am

Mr B

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gtir technician
gtir technician
Like splmum points out those 2 contacts are that sort of molded shape normally

small scuffing hopefully due to cap seated wrong .

15 Re: Missing / hesitating under any level of boost on 27th November 2016, 9:50 am

DRC

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Ok it might be how it's designed . The first cap was worn and the roter arm was worn out at the end . So was junk

The second cap was also wearing away as the arm had made contact with the points. So it was affecting the running as I changed the cap and roter for aftermarket numbers and it starts and runs better.
Also checking the condition of the new cap and arm after a few miles it's all fine.

The after market cap has 4 points that come out of the top of the cap as oppose to the two and two set up on the OE cap.
So I can see how I thought the arm had worn the cap away! Lesson learnt

16 Re: Missing / hesitating under any level of boost on 27th November 2016, 11:24 am

Mr B

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gtir technician
gtir technician
I would assume the seal you straightened out resolved issue hopefully, rotor runs close to cap pickups so if on a slant and low at that side it was contacting on the cap pin moldings at high rpm.
Can see some scuffing in your pic . better result than worn dizzy bearings so onwards and upwards .

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