GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: Diluxe on 27 August 2009, 15:00
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my 16v seems to be getting worse, yesterday it took 4 attempts to start, and I had to have my foot to the floor to get it to catch.
this mornining when it finally did catch it misfired several times, before smoothing out.
get the odd misfire upuntil its warmed once that happens no problems, and it only happens in the morning.
I've read nearly all the posts, i dont really want to keep replacing parts.
So I cant see any perished pipes, should i buy the ecu temp sensor 1st or the relays or is it the lambda sensor ;-)
BTW no error on vag com
cheers
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ECU and Fuel injection relays first!
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Ok to buy them straight from GSF? & if this doesnt work, I presume the ecu temp sensor is next?
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The reason I always say relays is because they dont show up on vagcom!
So therefore its logical that they will be the fault!
I am assuming you have checked the obvious things like plugs/leads/dizzy cap etc.
Any sensor be it temp or lambda should show up on vagcom.
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Ah gotcha, yep checked the standard bits already.
I assumed that if the sensor was only giving sparadic readings then it woudl not appear on vagcom unless you managed to get a reading at the time it was going faulty , if that makes sense, or will the error be logged even if it works it self out?
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Error log should be retained.
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Does it ALWAYS not start first time. Every time, without doubt in the cold? If so how does it idle when it does start in the cold?
Or is it a bit random, and can start if it feels like it? If so i reckon it COULD be distributor related. Although ECU relay is also very likely as len said. Although the ECU relay would cause the car to randomly cut out as well as not start? Same as the fuel relay.
Needs to be a bit more specific with syptoms, as some things will just stop it from starting, where as others will cause bad running.
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Yep definitely only happens on cold start and I mean morning start , as when I start it at after work it fires up luvely jubbly, but i still get the occassional hestitation/misfire but nothing as bad as in the mornings.
In the morning everyday this week so far its failed to catch unless foot is to the floor, then i need to keep my foot on the accelearator to keep the revs up as it kinda of looks like its going stall, this is only for maybe 10 secs, after which point i can leave it to idle, i can still hear it idleing roughly from the exhaust, although the rev counter is rock steady.
when i got moving the misfires/hesitations continue randomly until fully warm then everythings is fine, and the car feels normal & fast , I dont suffer from stalling at all.
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What rpm does it idle at when its cold?
As it should raise the idle itself to 1000rpm or just over when cold.
Then when warm it will drop the idle to about 900rpm.
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I would say 1100rpm then dropping down to 900rpm , but this happens all in under 1.5-2 mins i would say , i guess it would take longer when its really cold.
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In that case I really would check your dizzy cap again! I bet you have a tiny crack in it that air moisture is getting into it overnight!
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Yeah.
Im with len on the dizzy related.
As obviously the car is allowing for cold start.
IF it was the dizzy itself it would cut out when running. Im not sure if it was the cap if it would cut out when running?
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hmmm i'm following your thought process, just one thing , if its moisutre related i wouldnt need to give it additional petrol via the accelerator to the floor to get it to catch, or would i?
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Im not sure if you actually need to give it extra petrol.
Sometimes that just in your head. You get pissed off so you start slamming the pedal.
If its not getting enough fuel then generally the fault would be giving you problems when running. Eg fuel pump relay, fuel filter, fuel pump, injectors.
But never say never, this is just the internet!
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LOL :grin:
i'll wait until tomorrow, take the dizzy cap of before starting make sure its dry and then turn the engine over and see what happens.
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take all 4 leads out as well, check they're not covered in oil
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i assume you mean at the plugs end rather then the dizzy end?
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Yea thats what he means!
Its not necessarily the moisture, its the crack that is causing you to lose vacuum within the dizzy cap! That affects the spark you get. I mentioned moisture because that could be why its worse first thing in the morning.
You can check your relays BTW. When car hot (been running a while) stop, switch off and take out relays. If warm to touch, (best on your cheek) all around then they ok. if cold one side say or cold all round then they duff!
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Ok couldnt see any crack in the dizzy cap , and the relays were warm all round, but i didnt notice the hose in the below picture is looking a little nackered, i fiddled with it this morning whilst the car was running, and the car misfired even more on the go, so maybe this is my culprit, any ideas where i can buy this from today?
(http://i33.photobucket.com/albums/d96/diluxe/vacuumhose-1.jpg)
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Cant see pic but if this is the hose up to ECU then that is your problem!
Get some fuel type hose, diesel size is best.
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yep its the one going to the ECU , just rang GSF they do it by the meter for 2.20 pricey compared to ebay , but hey that the way the cookie crumbles, part number 18600 if anyone comes across this thread in the future.
Will update if this isnt the fix.
cheers for your help so far
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Good luck! :grin:
I fitted a new pipe to that recently and although it was clear (could blow through it) because it was too small a diameter it caused problems like you have!
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Good luck! :grin:
I fitted a new pipe to that recently and although it was clear (could blow through it) because it was too small a diameter it caused problems like you have!
Do you mean the replacement pipe you bought was of a thinner internal diameter and caused problems, as the one i've bought and fitted from GSF looks to be slightly smaller, and this morning i've still got the same issues :cry: Saying that the connectors at the ECU and throttle body cant be more than 2mm in diameter?? Runnin out of ideas..............
I replaced the relays so we count them out.
Update, car wouldnt start, had AA out , the coils nackered, he plugged on in that he had and the car was running smoothly, anyone know were i can get one from over the bank holiday? ECP are supposed top open sundays in wembley but there not picking up, and I dont think GSF open?
Updated new coil has fixed the car, its revs cleanly round to 7k, no misfires & only 26 quid from local motor spares shop :smiley:
cheers