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Gtir Motorsport club » Tech room » Help and Advice » Running lean at 5000rpm - FIXED!

Running lean at 5000rpm - FIXED!

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1 Running lean at 5000rpm - FIXED! on 24th July 2016, 7:33 pm

Spark plug spike

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AFR's are all good low 11's on boost until I hit about 5000rpm then it just leans out to 17's??

Was thinking fuel pump voltage drop at that point?

Any other ideas before I start checking for problems?



Last edited by Spark plug spike on 21st August 2016, 9:21 pm; edited 1 time in total

2 Re: Running lean at 5000rpm - FIXED! on 24th July 2016, 7:35 pm

johnny gtir

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moderator
moderator
I was going to say fuel pressure. You on standard Reg ?

3 Re: Running lean at 5000rpm - FIXED! on 24th July 2016, 7:52 pm

Spark plug spike

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johnny gtir wrote:I was going to say fuel pressure. You on standard Reg ?

Yes mate still standard reg, got a spare so may swap it over as well.

Cheers

4 Re: Running lean at 5000rpm - FIXED! on 24th July 2016, 8:24 pm

Cosmic73

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Spark plug spike wrote:AFR's are all good low 11's on boost until I hit about 5000rpm then it just leans out to 17's??

Was thinking fuel pump voltage drop at that point?

Any other ideas before I start checking for problems?



Hey Spike, how do you check afr?
Do you need specialist kit?
Very Happy

5 Re: Running lean at 5000rpm - FIXED! on 24th July 2016, 8:27 pm

shroom

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Yeah you need a wideband lambda sensor like a AEM wideband or innovate :-) might be worth you getting one

6 Re: Running lean at 5000rpm - FIXED! on 25th July 2016, 7:26 pm

Spark plug spike

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Well thought I would try the easy options first without removing the top mount.

Firstly hard wired from the fuel pump to a multi meter in the front took it to 5000rpm the AFR's dropped to 17's but the voltage didn't drop at all hmmm.

So went back to the garage removed the dump valve and same again AFR's dropped to 17's again over 5000rpm.

So looks like it's time to start checking the fuel reg, any way to test it or do I just change it over to a spare one check the AFR's?

7 Re: Running lean at 5000rpm - FIXED! on 25th July 2016, 7:29 pm

Spark plug spike

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Cosmic73 wrote:
Spark plug spike wrote:AFR's are all good low 11's on boost until I hit about 5000rpm then it just leans out to 17's??

Was thinking fuel pump voltage drop at that point?

Any other ideas before I start checking for problems?



Hey Spike, how do you check afr?
Do you need specialist kit?
Very Happy

As Tom says I use an AEM UEGO wideband which logs the AFR's through the Nistune software, there's a thread in the ECU forum with all the details how to set it all up if that interests you?

8 Re: Running lean at 5000rpm - FIXED! on 25th July 2016, 8:16 pm

Cosmic73

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For what ill be pushing it wont be worth the trouble, approx 300 target.
I'm making arrangements to have the R passed under Bobs nose now,
Thanks for your reply anyhow, Very Happy

9 Re: Running lean at 5000rpm - FIXED! on 25th July 2016, 8:32 pm

pulsarmoley

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moderator
moderator
When did you last change the fuel filter?


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10 Re: Running lean at 5000rpm - FIXED! on 25th July 2016, 9:16 pm

Cosmic73

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During the engine rebuild only a few months ago mate,

11 Re: Running lean at 5000rpm - FIXED! on 26th July 2016, 7:33 pm

Spark plug spike

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pulsarmoley wrote:When did you last change the fuel filter?

Changed it for a new one today still running lean scratch

12 Re: Running lean at 5000rpm - FIXED! on 26th July 2016, 8:51 pm

PartyPete

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the one star club
the one star club
Does it just run lean? No loss of power or miss fires etc? Could it be drawing air in from somewhere? A split in a pipe perhaps?

13 Re: Running lean at 5000rpm - FIXED! on 26th July 2016, 9:07 pm

Spark plug spike

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PartyPete wrote:Does it just run lean? No loss of power or miss fires etc? Could it be drawing air in from somewhere? A split in a pipe perhaps?

Yes mate hits 5000rpm and the wideband goes straight to lean, took it on the motorway and slowly took it up to 5000rpm in 5th and the same happened, no misfire or loss of boost/power but didn't take it any further as it was leaning out.

Going to remove the top mount and strip the plenum off and check all the hoses for any obvious issues, then go from there Evil or Very Mad

14 Re: Running lean at 5000rpm - FIXED! on 26th July 2016, 9:08 pm

shroom

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Could you try going back to the stock map and boost and just checking if its not your apexi? dont see why it would be put can you pull the power on it and see if it makes any difference.

15 Re: Running lean at 5000rpm - FIXED! on 26th July 2016, 9:13 pm

Spark plug spike

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shroom wrote:Could you try going back to the stock map and boost and just checking if its not your apexi? dont see why it would be put can you pull the power on it and see if it makes any difference.

Turned the boost down to 0.7 and still the same symptoms?

Was thinking it may be the Apexi so if the basic checks don't reveal anything I will return it all back to stock and go from there.

Was hoping it would be any easy fix, but nothing ever is with a R is it lol!

16 Re: Running lean at 5000rpm - FIXED! on 21st August 2016, 9:14 pm

Spark plug spike

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Sorted, it was the gasket from the turbo to air pipe that was leaking.

Decided to put the freshly painted rocker cover and polished intercooler shroud on.






17 Re: Running lean at 5000rpm - FIXED! on 22nd August 2016, 10:01 pm

johnny gtir

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moderator
moderator
Glad it's sorted and looks fresh with those on

18 Re: Running lean at 5000rpm - FIXED! on 23rd August 2016, 8:29 pm

Spark plug spike

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johnny gtir wrote:Glad it's sorted and looks fresh with those on

Cheers mate, just done a 4th gear run and fuelling is spot on from low 11's to mid 11's.


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