GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: novadragon007 on 28 December 2012, 21:16
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Was taking the mrs up to a friends house last night and noticed while i was waiting in the car the engine seems to be idling rather lumpy. Instead of just sitting just below 1000 revs it seems to be down around 600 revs and the car shakes every so often, sometimes the revs will bounce back up to 8 or 900 and fall below the 600 as if its about to cut out. Took her where she needed to go and arriving there the car just cut out soon as i dipped the clutch, restarted and pulled away, dipped the clutch and it cut out again. Also seems to be a slight loss of power. My engine light is on but its been on since i bought it as its got a full custom exhaust on it. I would provide codes but dont have access to a code reader and im not aware if the mk4 has a blink function by shorting out certain pins on the connector. Anyone got any ideas whats causing my issue and how i can fix it.
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Vacuum leak??
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take it thats a smoke test for vaccum leak? Another symptom to add sorry was the battery light came on when it cut out those times but there is no loss of power from the battery as it starts the car no problem after cut out.
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can let you use my code reader if your ever near glasgow :wink:
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MAF sensor. Just start the car as normal then unplug the sensor. It's located just after the air box. If this is the same fault as mine it will idle fine straight away. Don't run it unplugged though it will do damage. £121 for exchange at your local dealer. I'm picking mine up tomorrow. Hope this helps?
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Nice one i'll give that a try tomorrow. Just my luck its an expensive bit that goes.
can let you use my code reader if your ever near glasgow :wink:
If i wasnt working constantly id take a run up haha joys of working in retail over the festive period
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Let me know how it goes. You can pick them up from pages, ecp etc but apparently there just refurbished and don't last long.
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Give it a clean mate before you fork out for a new one! Search on eBay for maf cleaner, only a few quid and might save you some cash!
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I cleaned mine but it only worked for a week. You might be lucky though.
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I had a problem with the suction jet pump - cause lumpy idle as I popped out- might be worth taking a look
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well heres a sitrep. Unplugged the MAF sensor if anything it made it worse so it must be doing its job in some shape manner or form. Going to a party tomorrow night and ill get access to a code reader while im there see if it pings anything just wondering if anyone could shed anymore light on the subject incase theres no code thrown. Symptoms: Irratic idle followed by cutting out, whilst moving then dipping the clutch causes straight cut out and a slight loss of power. Battery light comes on when it cuts out and the epc light stays on before restart but goes out after the engine starts (not sure if thats normal)
someone mentioned suction jet pump where is it located is it accessible easily. Also there now seems to be a squeal at start up soon as engine starts it lets out a squeal but it doesnt sound like a belt. Loving this car so far lol
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Hello mate - the suction jet pump is located just under the inlet mani . Let the engine idle and listen for vac leaks - it sounds like a rather large one so should be easy to spot .... Saying that - it can be a b*tch!!
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Just to make that clear - it runs off the brake booster line - see picture below
(http://i4.photobucket.com/albums/y127/patb303/PCV/IMG_0255.jpg)
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i'll have a look in the daylight see if i can see or hear anything. Thanks for all the help folks and ill report back once i find something :)
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Okay got a code scanner its a vw audi vgate scanner so assuming it knows the ecu pretty well and the codes are as follows.
P0130 Oxygen (lambda) sensor B1 S1: Malfunction in circuit. (guessing thats cause of my manifold back exhaust)
P1297 Pressur drop between Turbo and Throttle Valve (check D.V.). (guessing this is causing my idling and power loss issue) Can anyone point me in the direction of what to do here.
Cheers in advance
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Right cars in the garage and i checked for an update today and they have cleaned the throttle body, checked for air leakschecked intercooler and all piping, checked air intake and all is well. One thing they did find is the exhaust is blowing badly at the turbo causing overfueling. Would this cause the irratic idle and cut outs aswell?
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Damn phone.....meant all is not well. They have done all that and the fault is still there
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mine was doing the same - but got so bad it wouldnt even start for more than 30sec cleaned throttle bodies and changed maf and seems to be ok at the moment still a vvv slight flutter when engine is cold
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Okay looking for a bit more help folks. Went and spoke to a vw/audi specialist who assures me the 17705 fault CANNOT ever be fixed. I refuse to believe this and after a hefty hunt around online i've come up with a list of possible causes but i was hoping some kind people could help me eliminate some of them based on the symptoms.
SYMPTOMS: On start up the engine will squeal but its not a belt i cannot place what the noise is.
Car refuses to idle properly and sounds like its about to cut out then eventually will.
If driven for a few minutes upon dipping the clutch coming to a stop the engine will cut out completely
Boost doesnt feel as powerful as when i got the car.
Fuel economy is shot to hell (5th gear at 55mph my computer was showing 18mpg)
DONE SO FAR: Throttle body cleaned and reset
Hole patched in exhaust
1st Lambda probe replaced
Mechanic says he has checked the vac lines not sure if he meant visually or pressure tested
Intercooler checked
POSSIBLE CAUSES: Boost leak
N112/N249/N75
Air flow meter
Suction Jet Pump
PCV Valve
I read about the turbo outlet to some kind of pancake hose if someone can give me the proper name
Lower intercooler pipe
TIP
Oil Dipstick (possibly split/cracked)
Checkvalve
Chargepipe
Map/Re-map (read about this but im not sure if the cars been remapped how would i know?)
If anyones got a spare minute or two to have a browse over the symptoms and possible causes and tell me whats more likely to be causing this if any of them id greatly appreciate it. Or if ive missed something do please let me know. Ive got an undriveable car now due to the cutting out when clutch is dipped which the vw/audi specialist reckoned wasnt linked to the 17705 issue can anyone confirm that?
Many Thanks