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Legacy Boost Issues


tweedo

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Hey all, 

 

Just a follow up on this in case anyone runs into similar issues in the future. 

 

I have had the car in at the mechanic and they found a couple of things, related and unrelated. 

They found that there was a pin hole sized hole in the downpipe but confirmed to me that this would be causing no issues at all as the rear o2 sensor seems to have been overridden. Would this be the case seeing it is a catless downpipe with aftermarket tune?

 

The main issue that they believe to be causing the problems though, is the fuel pump.

When the tested it they found it to have low fuel flow particularly in the 33% range, I believe. 

Their explanation was that I am effectively having to use more throttle input to get the same result. 

Hence why it is rolling on boost sooner than usual, but in actual fact would be normal for the produced throttle input... if that makes any sense at all. 

 

The car is booked in tomorrow to have the work done, new fuel pump and filter. So fingers crossed they are right!  

 

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Shouldn't be an issue. Rear one is to somehow confirm cat efficiency. Don't think I ever had to disable any codes in mine but it is still installed in place which may be the reason.

 

Should be at 100% duty once starting to boost so must be pretty knackered to be struggling to maintain pressure.

Interested to see if it works out, what pump are they putting in? Make sure it is the correct one for the cradle and that they don't just hack up the cradle to fit a generic one.

Low load stumbling is the usual sign of a worn pump rather than this. Has the fuel economy been rubbish lately? Is it stumbling with the normal amount of throttle you'd use?

 

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48 minutes ago, Andy_Mac said:

Shouldn't be an issue. Rear one is to somehow confirm cat efficiency. Don't think I ever had to disable any codes in mine but it is still installed in place which may be the reason.

 

Should be at 100% duty once starting to boost so must be pretty knackered to be struggling to maintain pressure.

Interested to see if it works out, what pump are they putting in? Make sure it is the correct one for the cradle and that they don't just hack up the cradle to fit a generic one.

Low load stumbling is the usual sign of a worn pump rather than this. Has the fuel economy been rubbish lately? Is it stumbling with the normal amount of throttle you'd use?

 

 

I think they said it is flowing fine once it gets to that but it's the point before boost should be coming on that's the issue.

It's down on power before boost comes on but no real noticable stumbling then seems to be as good as gold after that. 

Fuel economy has gone well down lately though. 

As for what pump they are putting in, I'm not 100% on that.

I know these guys are pretty by the book and I just can't see them doing something like that but maybe it'll pay for me to check. 

I would imagine genuine at the price I've been quoted though! ($390ish+gst for filter and pump).

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Probably too late now but setting the pump speed table to 100% across the board may have told you something. Doubt anyone here would have taken a stab at pump issues causing that so sometimes the pro’s really are the way to go.

Pretty steep though, is that with install cost or just the parts?

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13 hours ago, Andy_Mac said:

Probably too late now but setting the pump speed table to 100% across the board may have told you something. Doubt anyone here would have taken a stab at pump issues causing that so sometimes the pro’s really are the way to go.

Pretty steep though, is that with install cost or just the parts?

That's just the parts mate, $600ish+ including labour they reckon. 

I nearly fell over when they said $140+ for the fuel filter but I figured that's just what they're worth. 

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  • 3 weeks later...

Hey all,

 

Just following up on this now that it's been fixed.

I can confirm that the issue has been resolved with the changing of the fuel pump and filter.
Fuel usage back to where it should be, have gained back around 1.5L/100km.
Car has much more off boost power now, as well as pulling nicely through the range and is a pleasure to drive again so I'm a happy man. 

 

The only thing that still isn't right is the stored fuel trim readings, mostly at idle where it's sitting at -9.70%. 

I'm really not sure why either when the mechanic tells me the car is as healthy as a button. 

Only thing I can think of would be the new MAF is causing it.

Would incorrect MAF scaling do this? 

I think Dave from Cryotune had to adjust this when he tuned my car as I remember him saying the trims were a little higher than he would like. 

 

Any input would be great,

Cheers! 

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1 hour ago, Andy_Mac said:

Good stuff. Yea he would have tweaked them to try drop the correction factor down which wont really apply now with the more consistent flow.

 Approach for this now? Do I need to get the scaling rectified? 

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