WRX misfire
10 February 2009, 05:59 PM
#1
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WRX misfire
Hello
Im Ben and im new to this site so i have no idea what im doing really. Basically i have a question regarding my 1995 wrx import tommy kaira edition.
If i floor the car my turbo guage goes into the red and the engine misfires which feels like you have hit the limiter. If you slowly progress the throttle then it drives fine. There are no warning lights on and no garage i have asked knows what to do with it. I have a hunch it is something to do with the turbo actuator as if it is letting by too much air but im not really sure. Any imput on this problem would be extremely appreciated
Thanks in advance
Ben
P.S my email is coopdetroop@hotmail.com
Im Ben and im new to this site so i have no idea what im doing really. Basically i have a question regarding my 1995 wrx import tommy kaira edition.
If i floor the car my turbo guage goes into the red and the engine misfires which feels like you have hit the limiter. If you slowly progress the throttle then it drives fine. There are no warning lights on and no garage i have asked knows what to do with it. I have a hunch it is something to do with the turbo actuator as if it is letting by too much air but im not really sure. Any imput on this problem would be extremely appreciated
Thanks in advance
Ben
P.S my email is coopdetroop@hotmail.com
no fault codes either.
10 February 2009, 06:37 PM
#7
Hi Ben and welcome.
As 99greenwagon says, it sounds like overboost (spiking) and because of that the ECU is cutting the fuel to save your engine going pop
hence you feel like your hitting the limiter. I dont know much about the Apexi boost controller but can you not try turning the boost down a tad and see if it cures the problem
Hth.
As 99greenwagon says, it sounds like overboost (spiking) and because of that the ECU is cutting the fuel to save your engine going pop
hence you feel like your hitting the limiter. I dont know much about the Apexi boost controller but can you not try turning the boost down a tad and see if it cures the problem Hth.
Last edited by Glowplug; 10 February 2009 at 06:39 PM.
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25 February 2009, 05:39 PM
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wrx misfire
On the boost guage the red line is at 0.9kg/cm2 and it bounces past that a little when the engine cuts the power off so I am prety sure it is overboosting like most of you say. I am now starting to think that it isn't a boost controller at all because on it, it says air flow convertor and whether you turn it up or down it does nothing whatsoever.
Please help, this is driving me mental
Regards
Ben
Please help, this is driving me mental
Regards
Ben
25 February 2009, 05:44 PM
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wrx misfire
Sorry about the delay, been on holiday. Thanks alot for your input
There is definately no leaks as i have changed the up pipe which was leaking but this has not cured it. As said before it goes to 0.9kg/cm2 on the boost guage when the problem arises.
Ben
There is definately no leaks as i have changed the up pipe which was leaking but this has not cured it. As said before it goes to 0.9kg/cm2 on the boost guage when the problem arises.
Ben
25 February 2009, 06:01 PM
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I don't think that's fuel cut at that boost level (around 0.9bar), but it depends how far over that line it's going (could you estimate?). It's most probably the coilpacks as previously suggested.
This may be a red herring, but bear with me.... Until recently my MY95 WRX was hitting what appeared to be fuel cut in 2nd and third gears at high boost (1.1 bar with an ESL chip). I replaced the alternator last week, to solve a voltage issue that I was having and now the car doesn't appear to hit fuel cut any more..... Now.. The weather has been milder (so boost has decreased a smidgen), but I have a thoery.... If the voltage to the ECU wasn't sufficient or fluctuating with the old alternator, it's possible that sensor readings etc. were not being read correctly, so it "thought" it was overboosting. By replacing the alternator the voltage is now correct, so all the readings are correct, so no fuel cut. This hypothesis may be complete donkey's gonads, but who knows, it's another possible solution...?
This may be a red herring, but bear with me.... Until recently my MY95 WRX was hitting what appeared to be fuel cut in 2nd and third gears at high boost (1.1 bar with an ESL chip). I replaced the alternator last week, to solve a voltage issue that I was having and now the car doesn't appear to hit fuel cut any more..... Now.. The weather has been milder (so boost has decreased a smidgen), but I have a thoery.... If the voltage to the ECU wasn't sufficient or fluctuating with the old alternator, it's possible that sensor readings etc. were not being read correctly, so it "thought" it was overboosting. By replacing the alternator the voltage is now correct, so all the readings are correct, so no fuel cut. This hypothesis may be complete donkey's gonads, but who knows, it's another possible solution...?
25 February 2009, 08:26 PM
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Hi Mate
I understand what you're saying but mine does it in every gear and it only does it when you put your foot down hard on the throttle. If you progresivly build up the revs then it will go flat out with no probs.
Only problem is that if im coming out of a corner and want to quickly put the power on it just massivly jumps as if im hitting the rev limiter. Surely if it was the coil packs it would do it all the time regardless of rpm or throttle input.
HELP!
I understand what you're saying but mine does it in every gear and it only does it when you put your foot down hard on the throttle. If you progresivly build up the revs then it will go flat out with no probs.
Only problem is that if im coming out of a corner and want to quickly put the power on it just massivly jumps as if im hitting the rev limiter. Surely if it was the coil packs it would do it all the time regardless of rpm or throttle input.
HELP!
25 February 2009, 08:39 PM
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Surely its gotta be the actuator. No?.
It jumps to about 1.1 bar and i should be running 0.9 on a jap import
It jumps to about 1.1 bar and i should be running 0.9 on a jap import
Last edited by cooperbe; 25 February 2009 at 08:41 PM.
25 February 2009, 08:41 PM
#16
You dont say how long you've had the car mate?
Has it always done it??
Is that a full decat on the exhaust???
Have you checked all the pipe work associated with the BCS, and cleaned the BCS with brake cleaner????
No not actuator, that would cause underboost!
Has it always done it??
Is that a full decat on the exhaust???
Have you checked all the pipe work associated with the BCS, and cleaned the BCS with brake cleaner????
No not actuator, that would cause underboost!
Last edited by Glowplug; 25 February 2009 at 08:43 PM.
25 February 2009, 08:48 PM
#18
i had this on my 95 wrx..
i changed and cleaned the standard boost solonoid, put 2 bleed valves on, changed 3 actuators, replaced ALL the boosting pipes with expensive samco 8mm boost pipe, changed the ECU twice, bought an apexi AVC-R. i even disconnected the acutator, and jammed the waste gate wide open!! an it STILL overboosted. NONE of the above worked. i ended up buying a new turbo, an front mount. an when fitting them, we inspected the turbo. it was perfectly fine, impellor was spinning ok, no play in the shaft, no oil leaks, im a member of LADSoc. i put a post up on there, an it had over 80 hits with ideas. since changing the turbo an fitting the front mount its been fine up to now? but its still a mystery to me.
if yo find out what it is, please let me know, cos when ever an impreza mysteriously overboosts, people have ideas, an theorys, but its never usually the case?
no disrespect to the gurus of this site, but the thawt of it still overboosting grates me. it was SOOOOO annoying
i changed and cleaned the standard boost solonoid, put 2 bleed valves on, changed 3 actuators, replaced ALL the boosting pipes with expensive samco 8mm boost pipe, changed the ECU twice, bought an apexi AVC-R. i even disconnected the acutator, and jammed the waste gate wide open!! an it STILL overboosted. NONE of the above worked. i ended up buying a new turbo, an front mount. an when fitting them, we inspected the turbo. it was perfectly fine, impellor was spinning ok, no play in the shaft, no oil leaks, im a member of LADSoc. i put a post up on there, an it had over 80 hits with ideas. since changing the turbo an fitting the front mount its been fine up to now? but its still a mystery to me.
if yo find out what it is, please let me know, cos when ever an impreza mysteriously overboosts, people have ideas, an theorys, but its never usually the case?
no disrespect to the gurus of this site, but the thawt of it still overboosting grates me. it was SOOOOO annoying
25 February 2009, 08:49 PM
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25 February 2009, 09:02 PM
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To Scoobaru mad - it is extremely annoying and i really really hope you are wrong cos i dont wanna do all that
To B13bat - Thanks mate, i will try all that and hope to god it works.
Any other ideas would be very welcome
To B13bat - Thanks mate, i will try all that and hope to god it works.
Any other ideas would be very welcome
25 February 2009, 09:12 PM
#21
i really do hope you sort it mate! theres nothing worse than your pride an joy not working! if i find anything relevent that can be of use, i'll post it up for you mate!
25 February 2009, 10:12 PM
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i had exactley the same problem this weekend after re fitting my engine.... a mate swapped my boost soleniod and map sensor and it was fine after that untill it blew a pipe off....refitted the pipes securley and its now running mint and holding bang on 1 bar .
25 March 2010, 05:36 PM
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hi there im a newbie here so i just brought my first scooby and mine has developed the same thing it was running and spiking at 1.1 bar then dropping down to 0.9 but now theres no spike it boosts to 1.2 stays there then i get the big joult as you say like hitting the limiter ???? is this problem gonna be the same cheers
05 June 2011, 08:54 PM
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hi did u ever fix this? my 2003 wrx is driving me mad- wont boost very uneconomical missfire cylinder 2&4- lound sucking when i put my foot down- goes fine upto 3500rpm then misfires!
06 June 2011, 11:32 AM
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its always on super unleaded- im not sure if its remapped is there anyway of knowing? it has been decatted with a hks cone filter, diagnostic says misfires on cylinders 2&4
06 June 2011, 03:08 PM
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it was all done before i got it- its never ran properly since i got it as i got it cheap being told it needed a lambda...... and guess what it wasn't the problem lol.
where is the ecu? and can you tell if its been messed with?