Changed my coolent temp sensor last weekend and no luck:zx11: so am going to order a head harness next and see if this works....will keep yas updated ;)
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Changed my coolent temp sensor last weekend and no luck:zx11: so am going to order a head harness next and see if this works....will keep yas updated ;)
i got same problem with my car. when is cold it struggle to start. and the glow plug light goes off in a sec.
someone told me that it could be the glow plug relay.
does anyone knows??
any luck with your cold start problem alex??Quote:
Originally Posted by Alex Himself
ok update i have replaced my head harness and it has made no differance, im all out of ideas, ive turned to testing the heater plugs again and they dont receive any power on cold starts, i did a test for power when the orange light is on by dissconecting the temp sender and they get power ok but when the sender is connected and the engine is cold the light doesnt stay on long enough for power to heat the plugs. my dad is convinced it is the temp sensor but as i said earlier i replaced it with a genuine green vw one from VW SPEED. should i have bought one from the dealer????? or have i maybe got bigger problems than i thought :(
hi, your glow plugs dont recieve enough power to heat them because the ecu recieves temperature signals from the temp sender that are above the threshold level. ie. the temp isnt cold enough to require glow plugs for your start. The glow plugs on the TDI engine are used for initial cold engine running in cold conditions, they are they to insure improved combustion and improve the emmissions when the engine is very cold. they are not used as a starting aid unless the coolant temperture is below 5 degrees i think. Anyway ..it seems your problem lies within the static timing of the fuel pump. Have the car checked on vag com..it will show the injection time in relation to the fuel temperature. It sounds like your car is a little retarded.. this causes no problem when the car runs because the ecu can adjust this..however the cold start requires the fuel to be injected at the exact time to insure a clean start. The TDI engine has a window of injection time and has a prefered injection time. I suggest you talk to your mechanic and consider having this altered. To do it properly while u have the car stripped..its wise to change the timing belt and tensioner and maybe the water pump if u want or if its needed. Im quite sure this is the base of your cause. Mechanic's may sometimes try to shy away from adjusting the timing staticaly because it can be quite a timing consuming job..changing the pump sproket postion..and checking via vag come and repeating until its correct. If you look for 'hard start' on www.tdiclub.com im sure you'll understand more wat im getting at. But honestly..thats where your problem is. :)
i beg your pardon ...:( ive just noticed your have a PD engine ..the advice ive given above only applies to thos with an older generation original TDI ..sorry
Hi,
I have a TDI 110 AHF.I've had cold starting problems with my car.Had the battery tested that was fine.Had it serviced and hooked up to VAG-COM and no codes stored at all.Really bugged me for weeks.Being as i just bought it too i thought i'd been ripped off,but my mechanic said the glow plugs don't really need changing etc,so i thought i'd change them anyway and it worked .The car starts fine and i nearly went and paid for a new starter motor!!
Maybe glowplugs do more than you think and should be changed as they don't last forever.My car has 131k on the clock and the glowplugs were well knackered!
for £28 it was worth the try:D
hi.
i found out that we need to extend the glow time with vag com.
i will try this on my car as soon as i find a vag com
http://forums.tdiclub.com/showthread.php?t=123304
hope it helps guys.:D
ive got some more advice and ive been told to try the crank sensor!! so willing to give it a go an see. anyone had any problems with crank sensors?
oh and how do you extend the glow time?? as i have vag-com
oh i missed the link:Blush2:
:D