Use the search option. It is your friend.I guess my first question is what is "Vag-com"? My second is, is there a way to extend glow time without Vag-com?
Use the search option. It is your friend.
Actually it is. Searching will answer both questions of his.Search is your friend *is* not *an* answer.
The second way is to turn the key to the OFF position (after the dash glow indicator has turned off), and then right back to the ON for a second (or third) pre-start, minimum wait episode.I guess my first question is what is "Vag-com"? My second is, is there a way to extend glow time without Vag-com?
Is it a crime to invest in one's management of wrist movement?!Are people really just that lazy to turn the key a few extra times?
Glow time can be non existent on some cars at low temperatures (not all are created equally), so you can quintiple glow, but if the ecu isn't calling for any glow, you just wasted 5 key cycles as it didn't do anything. By doing this adjustment, it does 2 things. Increases the glow time (for the lazy people as you call them) but also increases the temp at which they start to glow. So, if your car does not glow at 45* F, cycling the key 5 times will do nothing. By making this adjustment, it does activate the plugs at that 'sweet spot' that many cars have a hard time starting with no glow.I'd agree that the glow plugs need the most help beyond what the VW engineers programmed in the ECU right around 32-45* F (just above freezing). This is when I triple glow, and I get the same result. I've never had a non-existent glow at these temperatures, though.
False.But I guess bottom line, no one really needs glow plugs. They're there mainly for improving emissions.
Agreed.You do not need to insult those who do want to make adjustments to their cars.
Wow. You know what beats this? Better function, and better form; which glow plug extending does. There is no reason not to keep your starts to one key turn. I'm surprised you are fighting this so adamantly, and then even adding snide comments. Wow.Yep, you got me right. I prefer function over form, like men usually do.
I gave you one good reason...SOME cars do not glow at all at a certain temperature threshold. So no amount of multiple cycling of the key will do ANYTHING. So your argument of telling people not to be lazy and just cycle the key a few times has no validity. And if you are OK with long cranking & smoke shows due to no glow time, good for you. That is your right. But some people have respect for their neighbors and don't want to create a smoke show, or extend the cranking time when its cold and wearing out their starter or battery prematurely. This mod can possibly help those situations. It may not help everyone, but can help some. Is that wrong?I was just looking for one good reason for this mod, and so far, I've gotten several "kinda-sorta-maybe-not really" reasons. (Ex. High altitudes: turn the key to "start" before the glow plug light turns off. Same result.) But I guess bottom line, no one really needs glow plugs. They're there mainly for improving emissions. I've seen lots of off-highway diesel engines that don't have glow plugs, and they have to be cranked for at least 10 seconds before they finally run on their own power. During the first minute they run, they sputter and smoke badly, and that's considered to be normal.
If glow plugs were only for emissions, then my 1.6 should have fired right up with dead glow plugs. But no... it didn't... http://www.youtube.com/watch?v=oFPjQWGdpvw
Some engines can start with no pre-heat... others require pre-heat at all temperatures... others require pre-heat below a certain point. It all depends on the engine design.
Thank you, that answers my question.VW/Audi IDI's do require glow plugs at every cold start, it is a lot harder to get an IDI cranked when cold. Many of these engines will not crank without at one glow plug cycle when cold even in warmer ambient temps......
But most DI diesels can get going without glow plugs except in the coldest temps with a few extra rpms cranking. And the answer is yes, engine and water system glow plugs on DI diesel engines like our TDIs have a lot to do with passing emissions. But once the temps go below 40 * F glow plugs make a real difference in cold starts. However I have seen rotary type injection pump TDIs get going as low as ~20 * F without glow plugs running a cycle but it created a local little brown cloud.
ah so the temp and times cant be adjusted seperately??It's my understanding that changing the gp time will extend it at all temps, and give it a little higher temp at which it starts. I've been wrong before....
that was the current engine temp when i did the adjustment. Do i need to wait till the temp is less ie 10C or whatever i want and then do the adjustment?28C? IIRC thats way too warm for the glow plugs to activate. You have to be below around 40F which is 10C i think?
No, the 2 variables cannot be changed seperately. The adjustment does 2 things. It increases the temperature at which the glow plugs activate, and increase the duration of the glow. But the 2 variables are linear and not adjustable seperately.ah so the temp and times cant be adjusted seperately??
i followed the guide on page 1, i changed the number to 32700, the temp was showing 28 degC, i tested it, saved it, switched ignition off then on, opened up the controller, logged in, adaptation 12, the time was still showing 0. However this morning the glowplugs came on for a few seconds so it must have worked.
do i just need to play with the figures if i need another second longer or is there some kind of logic to the numbers?
nice one thanksIIRC, you really cant go too far with the adaptation. Since the plugs glow for a few minutes after startup, in cold conditions, you dnt have to worry about a few seconds.
At 22 degrees Celsius, the engine should not need glow plugs to start, so the computer does not turn on the glow plugs. When you unplug the coolant temperature sensor, the computer does not know the temperature of the engine, so it assumes a much colder value (probably 0 degrees Celsius) and therefore turns on the glow plugs prior to starting.Hi all,
I have a 2004 Audi A4 V6 tdi. the car didnt have a quick start the first day i took delivery of it. it turns over and over for about 3seconds before it fires up. the problem got worse over the weeks and was told to replace glow plugs by my mechanic. I did as such and replaced all 6 plug with new ones ordered from Audi. the problem was still there and it became worse as the days go by. when it finally fires up, it puffs of white smoke from the exaust for a while before it clears up. I have researched on this forum and I found the glow plug relay was not clicking so I replaced the coolant temperature sensor with a new. I also replaced the glow plug relay 202 with a new one as well but still no improvement.
the car fires up almost instantly when I unplug the coolant temperature sensor as i hear the relay click and the glow plug starts glowing. But will never start when the sensor is plugged unless I keep cranking and cranking.
I have also checked the in-tank fuel pump and it works ok. what I noticed is when I turn the ignition on, the pump wont pump fuel unless I crank before it does. is this normal with this type of engine (BDH)?
I have also changed the fuel pump relay 395 but still no improvement.
I live in tropical Africa where our temperatures is around 22 degree celcius in the morning and I know VW engines will not need glow plugs at this temperature to start. but I think with a milage of 250,000km I will need a bit of glow time to start this engine.
I connected to VAG. com just to extend the glow time to see if it works. so I canged the default value from 32768 which give 0 seconds glow time at a temperature of 24 degrees to 32700 as described in this forum http://forums.tdiclub.com/showthread.php?t=123304
Intrestingly, the glow time still remained at 0 seconds no matter the value I put in. does this mean its not communicating with the ECU?
I read on other forums that the timing might be off which is giving difficult start but I also think its not timing since the car starts fine if the CTS is unplugged.
I dont know what to do now and really need your help as you guys are the experts and I follow almost all the problems menber post in here and the solutions you give them.
what else should I do since I have changed the following but the problem is still there.
1. coolant temperature sensor
2. glow plugs
3. glow plug relay 202
4. fuel pump relay 395,
5, fuel filter
6. air filter
7. coolant
are there order relays i need to check as well?
there are no code when connected to VAG.com except the the coolant temeperture sensor which is because I disconnected it to start the car.
sorry for being lenghty in my mail but I please need your help.
thanks,
Gordon.