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  #1  
Old 03-05-2011, 10:26 AM
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Default Issues with Brant , IACV, MAF, Crank or O2 sensor ????

Guys,

I have been having 2 different intermittent problems with my 03 / 04 STI.

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I have done plenty of searching but I can’t seem to find anything that is specific to my exact problems. I have had enough, and wanted to check here to see if anyone can shed any light at all on both of the issues I have, before I go spending any money on parts / labour.

Both these problems are intermittent and I cannot say that they happen after anything specific. I.E Car being hot / cold, weather condition or the current Moon phase. They do not happen at the same time or on the same day, they are totally separate of each other.

Issue #1

I Unlock the car with key fob, key in ignition (key light on dash goes away, other dash lights light up), punch in the Brant code, CEL lights up, can hear relay / relays clicking on Brant module inside dash, fuel pump primes (5 seconds), turn the key to start, just turns over, after about 4 or 5 seconds, I try again still no start. Lock the car whilst inside, open it again, try again, and away she goes. But when this happens the CEL light stays on? I can sometimes smell fuel dependant on how many tries I give her, before she starts.

I have tried to get the code buy using my ECU data scan, but it says there are no codes? The CEL goes away by itself after 5 starts. I have taken it to Subaru Ozzy Park when the CEL light is still on to get the codes read, but they said there were no codes up either, current or stored.

This issue would probably happen 1 in 15 times I try to start the car. Everyother time its fine.

Issue #2

Driving along normally within speed limits, slow down, begin to come to idle, get to idle (800 rpm), revs drop by about 300 rpm to around 500, car feels like it is going to stall, kind of. CEL comes on, couple of jabs on the loud pedal and it comes back to life, albeit with some hesitation initially. Again clears after 5 starts, and once again no codes.

This issues probably happens one a month.

So what I have done to try to fix the issues with a fair amount of reading, on here, rexnet,nasioc, iwsti, etc. I am not sure if both these items are related, seems weird that it throws a CEL with no code???

1. Clean IACV - It was pretty dirty - No change both issues still there.

2. Clean MAF numerous times - No change. I have also Disconnected the MAF, try to start, starts ok but CEL comes up, manage to get MAF code for CEL using ECU data scan (whichever one it is, I can’t remember now).

3. Do the DIY Brant solder of the module under the dash. Could not really see anything wrong with the solder joints that were there, but touched over the points in the DIY anyway - No change.

What Subaru told me.

Subaru told me to change out, remove or replace the Brant as this was causing issue #1. However the no starting issue so I have found by research normally is related to the fuel pump not priming? I hear the fuel pump prime and can on occasion smell fuel, quite strongly once it has failed to start... Not sure what my insurance company would think of my car Brantless?

Subaru then told me the MAF was the culprit for issue #2. If it was MAF related would it not cough and splutter more as I am going through the rev range, not just at idle?

What I have found.

If the car does not start after the first few turns over, I lock and unlock the car, try again and 9/10 it starts that time. Does my car have a separate immobiliser to the Brant system? Wonder if it could be this, if it does have a spate system that runs off the key fob?

Apart from that I am lost as what to change first, so I was wondering if anyone else has had these same problems? I am not sure if they are related or not? Seems weird that both throw a CEL with no code?

Any information would be great as I don’t want to go spending money on parts if I don’t need them

Apologies in advance for the massive post, but I wanted to get as much info down as possible.

Cheers guys

Simon

Last edited by RoughStilin; 03-05-2011 at 11:05 AM.
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Old 03-05-2011, 11:25 AM
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You are throwing a code and it is being stored. Some codes are just a little bit harder to read!

I'd take it back to ASG and get them to read it and go from there. Do you know if there have been any changes to your injectors?
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Old 03-05-2011, 11:27 AM
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Rip out the brant, that's all that needs to be said here.
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Old 03-05-2011, 12:04 PM
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lol yeah the brant can be a bitch sometimes, for awhile there mine was playing up, but now its fine... Not sure if its true, but someone told me if ya battery volts drop the brant will play up
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Old 03-05-2011, 12:16 PM
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Quote:
Originally Posted by Kato View Post
You are throwing a code and it is being stored. Some codes are just a little bit harder to read!

I'd take it back to ASG and get them to read it and go from there. Do you know if there have been any changes to your injectors?
Kato,

I cannot say 100% that the injectors are stock, but at a guess I say they would be due to the modís the car had when I bought it, which was just a catback and air filter. Unless the car has been modded and someone has put it back close to standard?

I had been having the issues prior to going to ASG and I did ask the guy who was tuning my car, and Sean if there were any codes in there and they said no. Plus if it had the CEL actually up on the dash and numerous times it had come up prior to me going to Subaru, surely they would have found it?
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Old 03-05-2011, 12:18 PM
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I only say it as I've had codes come up that the tech at Mitsubishi couldn't read. Some of the better programs out there can read a few more things.

The fact that it is coming up on the dash and staying on for the 5 starts means there is an issue with a code. If you can get that code, bam, problem solved.
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Old 03-05-2011, 12:32 PM
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Quote:
Originally Posted by Kato View Post
I only say it as I've had codes come up that the tech at Mitsubishi couldn't read. Some of the better programs out there can read a few more things.

The fact that it is coming up on the dash and staying on for the 5 starts means there is an issue with a code. If you can get that code, bam, problem solved.
Awesome thanks for that.

Just out of interest, the main codes the car throws with the CEL start with the P such as P0345 - Camshaft Position Sensor A Circuit Bank 2. If the codes are hard to read, I am assuming that they donít come up like the normal codes and I wondered if you had any other information (even form the Mitsubishi) what they might be looking for?

I really want to get this sorted asap.

One thing I forgot to mention before also, sometimes when it happens it also backfires.... Not sure if this helps the diagnosis at all....
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Old 03-05-2011, 12:45 PM
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If you want I can try check the codes with our workshops tool. I'd be getting rid of Brant anyway. Soon as you can try get some codes should start making more sense.
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Old 03-05-2011, 12:45 PM
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P codes are the normal codes.

If you know someone with a tatrix cable and evoscan/romraider or the like can read codes.
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Old 03-05-2011, 01:26 PM
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Quote:
Originally Posted by AntonRX View Post
If you want I can try check the codes with our workshops tool. I'd be getting rid of Brant anyway. Soon as you can try get some codes should start making more sense.
That would be a great help if you can. What type of scanning tool is it?

Simon
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