Carl Ulli
Well-known member
- Joined
- Feb 19, 2009
- Location
- Oshawa, Ontario
- TDI
- 2005 Jetta Wagon TDI (My Daughter's now); 2012 Highline Jetta TDI; 2012 Golf Wagon
I have a question for anybody who could help me.
I am a 7 hours drive away from home with my fairly newly acquired VAC-COM to help a friend with his 2005 BEW Jetta wagon. I would like to help him solve a hard starting issue before tomorrow, at which time I have to return home. Last night I just did a lengthy "observation session" with my VAG-COM to see just what is happening. I found that the glowplugs only pre-glow for 1.6 seconds. (The car sat all day, hadn't been run at all, so coolant temp. being equal to ambient temp. was 17degrees celsius.) We looked at alot of other things also before starting up the engine, just to get familiar with it. It called for injection time to be at 9deg. BTDC, and after it finally came up to operating temp. it changed to 2.8 deg. BTDC. I take it that this is bang on. I explained to my friend many things that I had learned from reading TDI forums and that all I really want to do is to tweak the pre-glow time a little bit, and recalibrate the EGR. He said that his mechanic cleaned out the intake system, and when I saw it start up I got the impression that he doesn't need to do the intake cleaning job. But I wanted to reduce the EGR to help keep his intake breathing well. His main problem starting up will be later on when it gets colder, so I want to address the glowplug issue. Ok that's enough backgound info.
Now the question: Since the glowplugs are either 5 or 7 volts and the full 12 volts would blow them, is that why the pre-glow is so short, and I understand that when winter comes that could increase without hurting the plugs, or does the ECU automatically change to pulses in the GP relay to drop the effective voltage to the GP's at the right time regardless of how much pre-glow I might set it to? In other words, should I try to change the setting to about 1.8 seconds or can I take it higher without risking damage?
Also, I found that the adaptation value screen comes up in Group 5 instead of Group 3 for the BEW engine, and then instead of the benchmark value of 32768 it is at 0 and the whole screen looks different than for the ALH anyway. So am I doing something wrong there?
I will check back here shortly, and any help would be appreciated.
PS I have started a thread in TDI 101 and now also here hopefully to get a faster response from more readers.
__________________
99.5 ALH since Aug '07
I am a 7 hours drive away from home with my fairly newly acquired VAC-COM to help a friend with his 2005 BEW Jetta wagon. I would like to help him solve a hard starting issue before tomorrow, at which time I have to return home. Last night I just did a lengthy "observation session" with my VAG-COM to see just what is happening. I found that the glowplugs only pre-glow for 1.6 seconds. (The car sat all day, hadn't been run at all, so coolant temp. being equal to ambient temp. was 17degrees celsius.) We looked at alot of other things also before starting up the engine, just to get familiar with it. It called for injection time to be at 9deg. BTDC, and after it finally came up to operating temp. it changed to 2.8 deg. BTDC. I take it that this is bang on. I explained to my friend many things that I had learned from reading TDI forums and that all I really want to do is to tweak the pre-glow time a little bit, and recalibrate the EGR. He said that his mechanic cleaned out the intake system, and when I saw it start up I got the impression that he doesn't need to do the intake cleaning job. But I wanted to reduce the EGR to help keep his intake breathing well. His main problem starting up will be later on when it gets colder, so I want to address the glowplug issue. Ok that's enough backgound info.
Now the question: Since the glowplugs are either 5 or 7 volts and the full 12 volts would blow them, is that why the pre-glow is so short, and I understand that when winter comes that could increase without hurting the plugs, or does the ECU automatically change to pulses in the GP relay to drop the effective voltage to the GP's at the right time regardless of how much pre-glow I might set it to? In other words, should I try to change the setting to about 1.8 seconds or can I take it higher without risking damage?
Also, I found that the adaptation value screen comes up in Group 5 instead of Group 3 for the BEW engine, and then instead of the benchmark value of 32768 it is at 0 and the whole screen looks different than for the ALH anyway. So am I doing something wrong there?
I will check back here shortly, and any help would be appreciated.
PS I have started a thread in TDI 101 and now also here hopefully to get a faster response from more readers.
__________________
99.5 ALH since Aug '07
