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Running Rich


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#1 Bradman

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Posted 24 November 2009 - 02:33 PM

My car is running way too rich and costing me a fortune in fuel. I've got a his induction kit, and a 1.6 mk1, how can I get around this issue?

Thanks in advance.
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#2 garath

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Posted 24 November 2009 - 02:49 PM

Does it have an FSE boost valve thing fitted? if so, get a standard fuel pressure regulator and throw that thing away :)

if not, check for fault codes, and suspect the o2 sensor
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#3 Bradman

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Posted 24 November 2009 - 03:10 PM

I've no idea what that is so I'm assuming I don't have one. I'll get the codes checked.
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#4 Bradman

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Posted 24 November 2009 - 08:22 PM

Do I have to adjust the spring in any way on the afm? I think I read something about that somewhere.
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#5 garath

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Posted 26 November 2009 - 08:24 AM

I doubt you have a screw on it, I know I dont
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#6 Gixer

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Posted 26 November 2009 - 09:16 AM

As you said already, check your codes.

Unfortunately 5's run rich as bollox and sup fuel like it's free, but if the O2's sensors bollox'd it'll be even worse.


What timing you running?
Might be worth bumping it up to 14 BTDC, might make a very very slight difference.


If the O2 sensors ok, only other thing you can do is to fit a piggyback or Standalone ECU and retune the car so it's a little leaner.
Pretty much everyone that's fitted a SC/urbo together with a Piggyback/Standalone has found that even though they're booting it more and have the tubby/SC they're still getting better MPG than stock.

No idea on the MAF/AFM as mines a 1.8 though sorry.


Cheers
Mark
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#7 garath

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Posted 26 November 2009 - 11:09 AM

an MX5 should go through the MOT without a problem (with regards to emissions)

so, you don't need to go down the piggy back ecu route as suggested above, just find what the problem is, its going to be a case of elimination I'm afraid.
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#8 Gixer

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Posted 26 November 2009 - 11:28 AM

an MX5 should go through the MOT without a problem (with regards to emissions)

so, you don't need to go down the piggy back ecu route as suggested above, just find what the problem is, its going to be a case of elimination I'm afraid.


:confused:

Who said anything about MOT's?


With everything working 100% correctly STILL MX5's run pig rich.


I suggested he check the codes, if everything is ok and it's still running rich, then the only course of action is to tune the ECU.
As this cannot be done effectively to a stock ECU, a Piggyback or standalone would do the job.
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#9 garath

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Posted 26 November 2009 - 11:32 AM

One assumes that the MOT is the problem.

I'm not going to argue with you Gixer, I can't be bothered
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#10 Gixer

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Posted 26 November 2009 - 11:44 AM

One assumes that the MOT is the problem.

I'm not going to argue with you Gixer, I can't be bothered


:confused:

All joking and sarcasm aside, you alright mate?

I've not argued, i simply stated my reasoning behind my advice and no one mentioned MOT's.
You've given him good advice and was the only person to help, i just thought i'd add to that.
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#11 Road&ster

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Posted 26 November 2009 - 03:20 PM

Bradman, what do you mean by "running too rich & costing you a fortune in fuel"??

As already mentioned the mk1 does run pretty rich as standard ( it was designed in the 80's when emissions targets and fuel consumption were not so much of an issue as they are today) , have you actually worked out your average mpg? if so, what is it?

Again, as already suggested, it would be worthwhile checking the fault codes if you can, and checking out the oxygen/lambda sensor as a possible cause.
Also, have a good look over the fuel lines & fuel rail, make sure you don't have a fuel leak anywhere, same goes for the petrol tank.

Other than that, I don't know what to suggest really. Work out your mpg and get back to us :thumb-up:
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#12 CRAIGO

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Posted 26 November 2009 - 04:40 PM

I've done some testing with my set-up (see siggy below) and the NB ECU richens the idle to an AFR of ~9:1 WITHOUT a valid narrowband o2 sensor signal. Imagine what it's like at higher RPM.

Try your o2 sensor over anything imo.
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#13 RobLyon

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Posted 26 November 2009 - 04:40 PM

What jimbob said + check your brakes aren't binding :)
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