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

Spark plug spike

Spark plug spike
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

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

johnny gtir

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

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

Spark plug spike

Spark plug spike
@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

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

Cosmic73

Cosmic73
@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

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

shroom

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

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

Spark plug spike

Spark plug spike
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?

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

Spark plug spike

Spark plug spike
@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?

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

Cosmic73

Cosmic73
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

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

pulsarmoley

pulsarmoley
moderator
moderator
When did you last change the fuel filter?


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

Cosmic73

Cosmic73
During the engine rebuild only a few months ago mate,

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

Spark plug spike

Spark plug spike
@pulsarmoley wrote:When did you last change the fuel filter?

Changed it for a new one today still running lean scratch

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

PartyPete

PartyPete
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?

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

Spark plug spike

Spark plug spike
@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

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

shroom

shroom
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.

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

Spark plug spike

Spark plug spike
@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!

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

Spark plug spike

Spark plug spike
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.

Running lean at 5000rpm - FIXED! Wp_20110

Running lean at 5000rpm - FIXED! Wp_20111

Running lean at 5000rpm - FIXED! Wp_20112

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

johnny gtir

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

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

Spark plug spike

Spark plug spike

@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.

Running lean at 5000rpm - FIXED! Image35

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