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Car Forum / Volkswagen / Water Cooled Volkswagen Cars / May 2007Rough running, testing hall sender - Haynes misprint?
So, new coil and ignition module, 8v GTi still running rough, spluttering, fuel smell, suspect misfire. I want to test the hall sender next. From Haynes 5B/4, section 5 "Hall sender - testing": Point 4 says: Pull back the rubber boot from the switch unit and connect a voltmeter between terminals 6 and 3. However, only pins 1,4,2 and 6 are connected to anything. Pin 3 is unused. This is borne out by Wiring diagram 72 (Page 12/56, part N41). Does anyone know which pins I should connect my voltmeter to? This must be a misprint in Haynes, right? In the meantime, I might check the timing, but it has been fine since I've had the car and I don't see why it would suddenly go way out of whack. I might even do a compression check. Cap, rotor, leads, plugs are all about a year old. Using the timing light, I can confirm that all four plugs are getting spark (/to/ the plugs anyway). I'm starting to get paranoid that there is still some dodgy petrol about. It takes 97 - not many people use that stuff, just me and the Lamborghini owners. :) Although - the fuel smell - weird. That makes me doubt the fuel pump and filter - I wonder if I'll find the plugs in awful condition when I do the compression check. Advice, sympathy etc welcome. > Although - the fuel smell - weird. That makes me doubt the fuel pump and > filter - I wonder if I'll find the plugs in awful condition when I do the > compression check. ^^ Erm the absolute 1st thing I would have done would have been to pull the plugs out regardless. It costs you nothing to do and *could* give you a *very* good pointer as to where your problem lies. You are not very specific when you say rough running. Is it rough only on idle? That suggests an induction leak through the inlet manifold/breather or even through the oil filler cap if the seal has had it. If it runs rough ALL the time does it ever get worse when the car warms up or if you accellerate hard? 8v GTi - year? digi? Kjet? > Advice, sympathy etc welcome. Do the plug check lol. And I normally use 95RON in mine for normal use - never supermarket stuff though computer says 10% less mpg! Chri$ >> Although - the fuel smell - weird. That makes me doubt the fuel pump and >> filter - I wonder if I'll find the plugs in awful condition when I do the [quoted text clipped - 10 lines] > > 8v GTi - year? digi? Kjet? 1988 Digifant. As it happens, I finally got the plugs out today, and did a compression check for a laugh. I've been losing coolant as well, so it seemed like a nice digression. ;) It's neither great nor disastrous, 145-150-150-160, cold. The plugs were black and pretty dry. Like the second pic down at http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm, but I'm not sure if it was dry or wet fouling - dry if I had to - it wasn't glossy. I'm going to give them a clean and then check the things in the links. I haven't even looked at the air filter and various airbox vents. The car certainly /smells/ rich. I don't think the choke is stuck on though. Bloody thing wouldn't start at all, today. Perhaps I'd do better to wait until the weekend when I can take my time and be a bit more methodical. I'll make a list of things to check and plough through it. >> Advice, sympathy etc welcome. > > Do the plug check lol. And I normally use 95RON in mine for normal use - > never supermarket stuff though computer says 10% less mpg! My computer says 99.9MPG even in London traffic. Most economical car ever. :D >>> Although - the fuel smell - weird. That makes me doubt the fuel pump >>> and filter - I wonder if I'll find the plugs in awful condition when I [quoted text clipped - 37 lines] > My computer says 99.9MPG even in London traffic. Most economical car > ever. :D If this is an 8v GTi then frankly the motor is too complex for you to discover the source of its rough running by simply looking at the plugs and checking the oil inlet, etc. My feeling is that whatever you do is only going to make it worse, not better. Why not take it to a good engineer and let them look at it? In the long run you are going to be better off. And, incidentally, talking about supermarket petrol, I was in the UK over the weekend and couldn't find Superplus anywhere. The local garage told me that he didn't supply it anymore as "people aren't prepared to pay for it, they only buy the cheap stuff". To my mind this is penny-pinching and pretty short sighted. In the long run it is no wonder people get problems. That's all. In news:f19k1f$f25$00$1@news.t-online.com, Bill Again <Bill@addcom.de> wittered on forthwith; >>>> Although - the fuel smell - weird. That makes me doubt the fuel >>>> pump and filter - I wonder if I'll find the plugs in awful [quoted text clipped - 44 lines] > a good engineer and let them look at it? In the long run you are > going to be better off. Complicated????? A Digipants Golf ain't complicated. > And, incidentally, talking about supermarket petrol, I was in the UK > over the weekend and couldn't find Superplus anywhere. The local > garage told me that he didn't supply it anymore as "people aren't > prepared to pay for it, they only buy the cheap stuff". To my mind > this is penny-pinching and pretty short sighted. In the long run it > is no wonder people get problems. I get my fuel from Supermarkets, seems to work ok. > That's all. Home by the sea.  SignaturePete M - Using the Scouse Side of the Force - Golf GTi Mk2 2.0 8v Wood and Pickett Range Rover V8 Turbo Golf GTi Mk1 (For Sale) OMF#9 Currently listening to The White Stripes > I get my fuel from Supermarkets, seems to work ok. I've used a mix of supermarket and big-name fuel, petrol and diesel, for years now. The only difference I've noticed is the Lupo runs a bit different on super unleaded. >> I get my fuel from Supermarkets, seems to work ok. > > > > I've used a mix of supermarket and big-name fuel, petrol and diesel, for > years now. The only difference I've noticed is the Lupo runs a bit > different on super unleaded. I just put in some fuel from a can as it was getting a little low. Lo and behold, it's running, and better. This could well confirm my "sh.t fuel" suspicion, but I'm going to take it on a test drive as it's not exactly smooth, even for a Golf GTi. In news:4638a8b5$0$19261$da0feed9@news.zen.co.uk, Antony Gelberg <antony@wayforth.co.uk> wittered on forthwith; >>> I get my fuel from Supermarkets, seems to work ok. >> > [quoted text clipped - 7 lines] > "sh.t fuel" suspicion, but I'm going to take it on a test drive as > it's not exactly smooth, even for a Golf GTi. Change the fuel filter. Mine did something similar to what you describe when the head gasket blew but your compression readings aren't as bad as mine were. Mine were 40, 35 dropping to 0, 130, 130... SignaturePete M - Using the Scouse Side of the Force - Golf GTi Mk2 2.0 8v Wood and Pickett Range Rover V8 Turbo Golf GTi Mk1 (For Sale) OMF#9 Currently listening to The White Stripes > In news:4638a8b5$0$19261$da0feed9@news.zen.co.uk, > Antony Gelberg <antony@wayforth.co.uk> wittered on forthwith; [quoted text clipped - 17 lines] > > Mine were 40, 35 dropping to 0, 130, 130... Whilst we're on the subject, my Digi 8V's running rough as f.ck on idle, possibly on 3 cyls looking at the exhaust. Now it may be it always did, but OTOH it has been stood for 8 months and it looks like the valve stem seals are bit leaky. Plug fouling? In news:f1alfn$q7b$1@registered.motzarella.org, Doki <mrdoki@gmail.com> wittered on forthwith; >> In news:4638a8b5$0$19261$da0feed9@news.zen.co.uk, >> Antony Gelberg <antony@wayforth.co.uk> wittered on forthwith; [quoted text clipped - 22 lines] > always did, but OTOH it has been stood for 8 months and it looks like > the valve stem seals are bit leaky. Plug fouling? possibly a sticking high bollock follower. or dodgy leads.. SignaturePete M - Using the Scouse Side of the Force - Golf GTi Mk2 2.0 8v Wood and Pickett Range Rover V8 Turbo Golf GTi Mk1 (For Sale) OMF#9 Currently listening to The White Stripes >>> Although - the fuel smell - weird. That makes me doubt the fuel pump >>> and filter - I wonder if I'll find the plugs in awful condition when I [quoted text clipped - 37 lines] > My computer says 99.9MPG even in London traffic. Most economical car > ever. :D Have you tried clubgti's forum? There are plenty of people with a decent amount of technical knowledge on this sort of stuff. I'd be inclined to give it a full service, swap the plugs, clean the metering head etc. and see if that fixes it. Possibly all the other bits if they were from GSF or ECP... Failing that, ECUs aren't really that dear second hand. > So, new coil and ignition module, 8v GTi still running rough, spluttering, > fuel smell, suspect misfire. I want to test the hall sender next. From [quoted text clipped - 26 lines] > > Advice, sympathy etc welcome. If you smell fuel then you obviously have a leak. This could lower the fuel pressure in the fuel rail and make the engine run lean and misfire. Check for leaks around the rail and also check the vac. line to the fuel pressure regulator and ecu. If it has an o2 sensor try disconnecting it. SFC |
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