Mike_2009

Hi guys,I have a 2001 Bugeye WRX. Standard car except for backbox and induction kit. Ive owned it now for 6 months and had no problems with it so far .Its hard to explain but recently its started to miss \ shudder abit when crusing along at fairly low speed but only every now and then. Almost as if it being starved of fuel for a split second or what you'd probably expect if the plugs needed changing etc...Im not that mechanically minded so I was after some advice on what to check first? Ive heard about air leaks etc but I have this problem without the turbo kicking in (dont know if that eliminates anything there?). What should I be checking first, im guessing plugs, HT leads, coil pack, MAF sensor (would I still have one with induction kit being fitted)? Are there any good 'how to's' anywhere for checking this stuff? I like to have ago myself where I can so I can learn abit...Im also wondering if its the juice from Morrisons which is doing it. Im going to fill up somewhere else to rule that out later this week. I also dont do alot of mileage because I only work 10 minutes away from home (2 or 3 miles) so the car doesn't do alot of mileage. Wondering if thats causing something to get clogged up... oil looks ok and all fluid levels etc are fine.Car does have full SH and I think the plugs have been changed in the past. 67k on the clock at the moAny suggestions welcomeMike

ayesy

iTrader: (1)

I had a similar problem on my bugeye ,65k, it turned out to be air leak in the turbo vac hose system. The pipe from the BOV to the manifold had begun to perrish. The miss in my case was when on very light throttle.


Have had MAF issues previously giving similar results.

Happy hunting

Tidgy

sound slike maf to me.

get it checked out by a specialist asap and try to drive it as little as possible and like a granny.

if the mafs gone and you thrash it it could destroy the engine in a worst case.

Mike_2009

Ok, thanks. So check the pipe from the recirc valve to manifold? How can I check the MAF, where is that located, after the induction kit? Would I have a MAF on a 2001 with an aftermarket air filter, dont you have to take it off?

Ryan@Indigo-GT

iTrader: (4)

You're car will still have a MAF sensor, easiest way to check the maf yourself is if you have a mate with the same the car, same MAF, swap them over and see if the symptoms go away.

95turbowagon

iTrader: (17)

Maf is just behind the airbox, or in your case just after your induction filter.

Mike_2009

Ok, thanks. I'll try some MAF cleaner to see if that helps...

Midlife......

iTrader: (2)

Bug MAF uses Torx screws IRC

Shaun

Mike_2009

To follow up from this.... I left it for the last 2 weeks and hadnt had the problem again until the other day when the engine light came on. Car was running rough, plugged into ECU and read codes P0420 and P0171 - system catalyst below threshhold and system running lean

Since that Ive cleared the codes and cleaned the MAF and so far the lights stayed off for the past week but I'm sure the car feels like theres less power and as if the turbo is taking longer to kick in and spool up (like hesitation)

Based on those codes could it just be a faulty rear o2 sensor (even though the lights not come back on) or even things like coils etc?

I've looked for any obvious hose problems but cant see any... could it even be abit of a leak on the exhuast system somewhere causing it to run sluggish since the codes popped up the other day relating to exhaust CAT?

giz1978

iTrader: (5)

Lamda front causes problems more then rear but that is the fault code that is your need move but I have see the cold start cat cause the same problem your having.

Mike_2009

From abit more reading up tonight I can see the P0171 code can be thrown up at times due to turbulence around the MAF if a non standard air intake is fitted...(which I have)

Im going to try cleaning the boost solenoid, changing the fuel filter and plugs I think...

I also have a tactrix cable and could install open ECU if someone could advise me on what to look for in the data logged i.e. how to check CAT, MAF readings\parameters are correct?

Cheers

Mike_2009

Anyone know how to check data logged from OpenECU for CAT \ AFM?

EngineMapper @ Group B Motorsport

The problem with AFM and induction kits is the AFM sensitivity to changes in the airflow before it. Induction kits not only ruin fueling but end up ruining Mafs, so the above series of errors could all be related to the Maf and induction kit.

You have two options as I see it, run it to a known good Subaru specialist with a dyno and have it run to assess the situation. They should be able to advise from there, but to sort it relatively easily I'd change the induction kit to an original air box and change the Maf potentially, but I could tell you what the problem was and how to sort it from a simple dyno run.

The other option is the same as the above really and then a remap to suite the induction kit. Most induction kits are not very good, so the likely outcome to this all is move back to the original air box system in my opinion and then go from there.

Send me any logs you have if you need a hand, but ideally it needs looking at by a Subaru mapping specialist really.

Give me a shout if I can help.

jura11

iTrader: (7)

Try download RomRaider and use these guides



http://www.romraider.com/forum/viewt...hp?f=33&t=5320

http://www.romraider.com/forum/viewt...hp?f=33&t=5384

http://romraider.com/forum/viewtopic.php?f=33&t=6156


Jura

Mike_2009

I've now noticed that the problrm is occuring when the engine is warmed up i.e. when ive done a few 20 minute journeys in quick succession. As I mainly drive to work in a morning when cold and then home at night when cold for 15 mins each way it's only ovet the weekend just gone when I used the car alot that the problem happened again. Basically when started from cold in the morning it ran fine but then in the afternoon after the car had only stood for 30 mins I started it and it feels lumpy as if on 3 cylinders. No CEL on or codes logged but runs really rough.Im wondering if something is expanding when heated up and lettign air leak? Would a leak on the exhaust cause the engine to run rough? Is there any specific joints, hoses to check which may relate to when the car is warmed up? When I change the plugs (hoepfully this week) I wanted to check the coils are ok... How do you know if the coil is working fine?I will also install rom raider as suggested and post a log from when its idling rough, thanks for the guidance so far!

nick172sport

iTrader: (6)

dont run a scoob on 95 ron fuel ie morrisons look on your fuel cap it says super unleaded