GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: Norfolknudger on 18 March 2013, 20:45
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Hi all I bought my t reg 1999 golf early last year and have run around in it happily until recently she's been modified air intake decat remapped to 212bhp when I first had her she had a small occasional back fire but recently it's started to over fuel with plenty of backfiring and she also seems to be choking under throttling and missing I've changed the airflow meter the lamba sensor as its been decated it only has 1 and I've changed spark plugs but still no joy so I changed the ecu clocks and ignition barrel ran loverly till she got warm then started to choke itself again can anyone help as I'm lost now cheers all will :sick:
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best thing to do is get it scanned with vagcom and post the codes that will help people on here diagnose your troubles.
Posting in 3 seperate sub forums wont help much at all :wink:
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yep check fault codes sounds like ignition amp or coolant temp sensor.why did you change the ecu,clocks ect
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Hi thanks for info the reason I changed the ecu was it was a last resort as I'd tried to all other things I could think to do tried at first to change ignition and ecu but wouldn't work without clocks
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Hi again all I got the car over to my friends garage the weekend when he took it out for a test drive he noticed/herd an air draw and on closer inspection noticed the top alloy air cooler pipe from front intercooler had worn a hole in itself by rudding on the bulk head so thought we'd found the problem so tigged a patch on put car back together went out for another test drive although she now pulls like a train the problem reacured when car warmed up so plugged it in to diagnostic machine and the only code it came up with was temp sensor so got a brand new one fitted it but once again it's still playing up but does seem a lot better going to change the ignition power pack to see if that cures it unless you guys have any clues for me cheers for the help guys much appreciated :embarrassed:
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which temp sensor? intake/coolant? if its a coolant temp sensor was it a brand new genuine volkswagen one. The mk4 doesnt like cheap parts at all lol always best to use genuine oem parts as thats what the vehicle was designed to use. For things like lambdas and mafs best to go with bosch
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Sorry fella yea it was the coolant temp sensor I didn't buy the sensor but I'm sure he would have used genuine bits
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is it definitely overfuelling? i.e is it fouling the plugs?
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Yep changed plugs when they came out they where covered in crap it smells of petrol and the exhaust tail pipe is black and it even spits out black muck onto floor when you start it mate
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being a '99 (AGU) fault codes can be more of a hindrance than a help sometimes, datalogging in detail with vagcom may tell you a bit more but ideally you need some form of wideband logging to see whats really going on with the fuel, and what the ECU is doing when it starts to play up.
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Hi again going over to garage tomorrow going to clean maf sensor and check ignition amp to see if it helps fingers crossed :cool:
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good luck mate, you might of already done this but have you cleaned the TB?
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Sorry fella I'm being a bit thick what's the TB do you men the turbo thanks for your help fella :laugh:
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Sorry fella I'm being a bit thick what's the TB do you men the turbo thanks for your help fella :laugh:
TB = throttle body
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Going to try another throttle body on Monday as just tried a new ignition amp and still the same :sick:
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212bhp? Stock turbo on AGU?
Could be signs of a weak fuel pump maybe? Lean misfire.
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no ones put a bit of diesel in it .
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no ones put a bit of diesel in it .
:lipsrsealed:
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No its had no diesel in it mate I thought of that as her indoors uses it more than me but she assures me she hasn't and mechanic has said it would smoke so I've taken this out of the equation as for fuel pump it could be that it's about the only thing I haven't tried yet my mechanic still hasn't changed the TB but has said he cleaned old throttle body and it ran spot on he tried it again the next day and it played up again so until he tries another clean TB I won't know but I will suggest the fuel pump to him and see what he says thanks for all your input fellas it is appreciated :laugh:
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Getting there cleaned throttle body and sensor both filthy car is now 98% better doesn't smell of petrol anymore but think this is because the hole in the intercooler pipe that had rubbed through whilst rubbing bulk head is now fixed but she seems a little bumpy when you lift of the throttle and it wouldn't let me accelerate to boost without a couple off blips on throttle after sitting at traffic lights for a while so think this could be caused by lazy pump as suggested but I'm nearly there now drove 40miles today and didn't miss a beat :laugh: thanks again guys for all suggestions really has helped me out