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Model specific boards => Golf mk4 => Topic started by: Immortal on 12 March 2013, 00:22
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Evening all
I require your assistance with a rough running issue.
Intermittently I experience issues when first turning the ignition over, it will chug a couple of times & then die. After turning it over a few more times it will catch & run almost normally, just with reduced boost.
Next it will loose all boost when under heavy load (ie flooring it), generally between 2.5k & 3k rpm. When this occurs it is extremely lumpy & backfires once or twice. Then it hits 3k+ rpm & the boost suddenly surges back.
I've had it on VAGCOM a couple of times but all it's showing up are the symptoms, not the cause.
The 1st time it threw up that it was running lean (I could have figured that out without the computer) plus the god awfull 17705 pressure lose code.
Yesterday I was coming back north up the M1 & it did it BIG time when going up the big hill leading to J37. I was happily cruising at around 70-75 at the bottom of the hill, by the time I got to the top I was doing 40ish the CEL came on & it was coughing & spluttering. I got off at 37 & turned it off, thinking I'd lost a hose. However everything was fine under the hood.
After 10 mins I turned it over & it was fine for another 10 miles or so then started again.
Got it on VAGCOM again this afternoon, with the following results:
17704 - Temp sensor (but it's not overheating)
17705 - Pressure loss (checked everything again, no splits anywhere)
17854 - O2 sensor after the cat (So shouldn't affect the running)
Since this first started its had the timing belt, water pump, plugs, 2 coils, an oil filter & oil change (ie a major service).
Initially i thought it could be the fuel filter, but its intermittent & a restriction wouldnt be. So now I'm thinking it could be the lamba sensor before the cat that's throwing some strange messages back to the ECU.
Anyone had any similar experiences? If so; what the hell was it???
Any help would be greatly appreciated!
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throw a temp sensor in it an why did you only stick 2 coil-packs in it
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Two were showing intermittent faults, so I stuck them in to eliminate them (plus I was broke at the time :wink:)
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Two were showing intermittent faults, so I stuck them in to eliminate them (plus I was broke at the time :wink:)
phone vw give them your reg they might be part of the re-call for coil-packs an were does your temp sit on the motorway :smiley:
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Sat bang on 90C all the way.
Ill speak to VW in the morning
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Sat bang on 90C all the way.
Ill speak to VW in the morning
dont mention you replaced 2 already :whistle:
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for a german car these thing dont like the cold weather too much, tbh though i found that changing my oil to castrol GTX as stop all rough idling and car pulls better :undecided: i dont know if this would help in any way though
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Sat bang on 90C all the way.
Ill speak to VW in the morning
dont mention you replaced 2 already :whistle:
Unless you still have the old ones they will know and not do anything
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It is already on Castrol GTX.
As I mentioned earlier, it's not the coils. The issue is that it's running the mixture too lean, I just can't figure out why!
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O2 sensor replacement then?