Flashing Cruise and Engine light on and Dynamic Drive Control light on - Subaru WRX Forum
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#1 Old 03-03-2010, 02:35 PM
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Unhappy Flashing Cruise and Engine light on and Dynamic Drive Control light on

Im a UK user and my car is only 3 months old, Impreza 2.5 WRX Turbo.

Ive fitted a new backbox, K&N Air Induction Kit and a Forge BOV last weekend.

All was well until the BOV was fitted, when I would temporarily lose power for about 1/3 of a second when changing gear at 5,000rpm. Then after about 80 miles of driving, the engine light came on, cruise control light began flashing and my dynamic driving light stayed on.

No funny noise or weird things happened and I managed to get the other 40 miles of driving home without issue except these lights wont turn off.

Ive just unplugged the battery in hope that the ECU will reset itself and hopefully (from looking at other forums) reconfigure itself to my new setup by holding revs at 3,000 when i start it up. Whether this is right or not, I dont know and hence Im asking anyone on this site if they can help. This is my fourth impreza and newest to own and I dont want to take it into the dealer if I can help it as i dont know if my warranty is void because of the mods i have made to the car....

Help me pleaseeeee! lol! Cry!
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#2 Old 03-03-2010, 03:10 PM
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If you haven't already seen this site, it has some great info on modding: Unabomber's Manifesto - NASIOC

I'm willing to bet your problem is your BOV. If you have the stock one, put it back on and see if your problem goes away. Aftermarket BOVs on WRXs (especially those vented to the atmosphere, without a tune) are known to cause lean conditions inbetween shifts because they send all the wasted air to the atmosphere instead of back into the intake like the stock bypass valve (BPV) or a hybrid BOV (some to atmosphere, some to intake) would and your ECU is trying to compensate for that extra air with extra fuel, but since there's no air there, there's extra fuel and that's not a good situation. Reinstall your stock BOV/BPV, unplug your battery again so your CEL goes off, and that should do the trick.

Also, what's a backbox?

John
07 WRX
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#3 Old 03-03-2010, 04:14 PM
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Thanks, Im leaving the battery unplugged for the night and the OEM recirc pump is back on. Im hoping it'll be ok in the morning.

Im also hoping I can get it seen for free via my warranty at my local subaru dealer.

Ref the backbox, in the uk its the pipe and exhaust box AFTER the cat converter, gives it that growl.

Would you know of a suitable product for the 2009 wrx that wont give me the issue that im having, i loved the sound while i had it (was nice and loud and a head-turner) so id really like to still go for it.

Regards

Carl
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#4 Old 03-03-2010, 04:16 PM
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Quote:
Originally Posted by carlh View Post
All was well until the BOV was fitted, when I would temporarily lose power for about 1/3 of a second when changing gear at 5,000rpm. Then after about 80 miles of driving, the engine light came on, cruise control light began flashing and my dynamic driving light stayed on.
You are venting gasses that your car thinks are still present within the system, your car is adding fuel based on A/F calculations which are no longer accurate, it is taking 1/3 of a second to recalculate values and fix the mixture. You need to tune for your BOV or remove it, my vote is to get rid of it since it is negatively affecting performance.

Any BOV that makes the sound you are looking for will be venting gasses and causing the same problem.

Ryan
2009 STi - Cobb Stage 2
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#5 Old 03-03-2010, 07:39 PM
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Cobb XLE BOV (can be ran in hybrid and gives the sound you are looking for, I run it on my 07 WRX) with no problems, Perrin makes a nice BPV that is loud even though its full recirc, turbosmart makes a nice hybrid and so does GFB.

Next time try and get the CEL or code read just to make sure it was something simple and not bad for the car. But Im sure things will be alrite, be sure to keep us updated.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#6 Old 03-04-2010, 06:07 AM
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hi guys,

Thanks for the info you have given me.

I managed to get hold of a subaru specialist about 40 miles away from me, spoke to them about it and they say, although I will confirm this on monday, that "there is a problem with the ecu" that seems to be raising its head on new models..... Great eh.

Im hoping to get the car retuned once they've identified the issue, hopefully it will fall under warranty then I'll get them retune to the BOV fitted to compensate for the changes to the system I have made.

I'll find out on monday and let you all know.

Best Regards

Carl Harrison
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#7 Old 03-04-2010, 08:19 AM
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I'm pretty sure you can't tune for a bov, at least from what I've been told.

-Chris
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#8 Old 03-04-2010, 12:55 PM
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Its not a tune, its a change in your setup. You would need to switch from MAF to something like speed density. Best bet is to get an intake and maybe a Hybrid BOV or BPV.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#9 Old 03-09-2010, 03:01 AM
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Update fellas:

Took my car to a subaru specialist.

They reset the ECU, saying that there's 2 memories and that doing a battery disconnect, doesnt reset the backup memory so the backup goes and overwrites the main memory, hence I could not reset it properly.

After just under 100 miles, my lights have come back on.

Joshua (newtothegame), I already have a K&N Cold Air Induction Kit fitted (Apollo).

Ive rang up the specialist this morning, told them that my lights are back on and am awaiting them to ring me back.....
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#10 Old 03-09-2010, 06:42 AM
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Never heard the "two" memory thing, but idk everything about these cars especially the new ones. Real crappy to hear that the lights are back on. I hope that you can get a good straight answer, and an easy fix with this problem. Good luck.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#11 Old 03-09-2010, 06:51 AM
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Another hour, another update

The subaru specialist "believes" - I aint got much confidence in a so called specialist if they "believe", they SHOULD know.... Anyway they "believe" that the lights should rectify themselves after 100+ miles of driving when the ECU recognises that things are "back to normal". Sounds like BS to me....

Ive spoken to the manufacturer of the BOV, he reckons I need a smaller spring (dont ask me what the spring is, all I know is they are sending it to me, free of charge, I should get this tomorrow so I'll be testing it over the weekend.

Ive got a 350 mile drive on sunday as its Mothers day here in the UK on sunday.

So my plan of action is now: take the BOV off tonight when I limp home, I can put nearly 100 miles on the clock tomorrow, see if the lights go off by tomorrow evening, by which time, I should have my new spring, then I can give it a good bashing on my 350 mile drive. Of course, I will be taking the original Recirc valve along with some tools, just in case lol

The only thing thats made sense in this whole pain in the arse problem, is that Im agreeing with you good guys about the BOV being the issue and I think I'll be able to crack this one and get it sorted.

THANK YOU ALL and update you soon!
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#12 Old 03-09-2010, 03:29 PM
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Another update!

Ok. So I rang the manufacturer of the BOV and explained the issue with the power-loss and delayed acceleration. Straight away, they said it could be a small spring.

A little history: When I had the BOV delivered, I had two additional "big" springs. These were RED and BLUE....

The manufacturer said they were sending me a "small" spring and I should replace the one inside the BOV with the one they were sending. Im still awaiting for that and should be with me within 24hours, meantime, I checked the strength of the springs I had, the blue one was "quite stiff" lol and the red one, was very stiff, so I proceeded to open up the BOV and take a peek.

There was a YELLOW spring, which was not very stiff at all, not compared to the BLUE or the RED one anyway. So I replaced the built-in YELLOW spring with the blue. Gave the car a little blast and found that acceleration was indeed improved, there was little lag, BUT I did get some backfiring from the exhaust - only a pop now and again. So when I got back to my driveway, whipped the BOV off, replaced the BLUE spring with the much harder RED one. Took it out again. WOW. Performance was MUCH better and the whoosh sound only came on when I got above 3,000 revs or so. NO LAG at all!!!!

So, next on the plan is: 100 mile journey tomorrow, hoping the lights will sort themselves out - I still got the occasional "pop" but I think it might be the ECU still configured to the weak yellow spring that came with the BOV.

When Ive done my 100mile journey, Im hoping the lights will disengage off the dashboard and I'll be a happy scooby owner once more. If not, Ill be taking it back to the "specialist" to get them to reset my ECU for free - they'd better had anyway, as I paid them to diagnose and repair the lights and all they done was repair the lights. He didnt even know I had a cold air induction kit fitted as he didnt lift the bonnet. NOT VERY GOOD AT ALL.... I may send something to Subaru to let them know that the "specialist" shouldnt be looking after their cars!

Im hoping, fingers crossed that tomorrow I will have the definitive end to this issue and that basically if anyone fits a BOV to their WRX 2009 and has major lag and fuel issues, it'll most likely be the spring in the BOV not being tense enough and that if they have spares given with the BOV, fit them before spending your hard earned cash on a specialist who might not have a clue!
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#13 Old 03-09-2010, 04:22 PM
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You could have fixed your problem a week ago by putting the stock BPV back on your car.

Ryan
2009 STi - Cobb Stage 2
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#14 Old 03-10-2010, 06:44 AM
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True, but then I wouldnt have the great BOV sound plus a few extra BHP gained. Guess its in my nature to just get it sorted rather than give up I suppose. Anyway, hopefully it'll help someone else who has a similar situation who isnt as mechanically minded as the rest of you.
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#15 Old 03-10-2010, 08:44 AM
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Originally Posted by carlh View Post
True, but then I wouldnt have the great BOV sound plus a few extra BHP gained. Guess its in my nature to just get it sorted rather than give up I suppose. Anyway, hopefully it'll help someone else who has a similar situation who isnt as mechanically minded as the rest of you.
It is unlikely you are gaining any BHP, people are lying to you. I don't consider it giving up to remove a part that does nothing for you that is causing problems. If the "great BOV sound" is really important to you and worth the potential performance/reliability issues then I guess all this work isn't for nothing.

Glad you got it sorted out.

Ryan
2009 STi - Cobb Stage 2
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