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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 8th, 2018, 22:18   #1
e_v_a_n
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Default 04 golf hard starting after harness and glow plugs

Hey all
So yes, I searched. Still can't figure it out...
Car starts hard when cold (freezing and below), takes maybe 10 seconds of cranking after key left in on position until glow plug light goes out. Kind of stumbles to idle.
I replaced both harness and glow plugs. P0671 to p0674 codes thrown. Once it starts, it runs well.
What else can I check?
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Old November 9th, 2018, 03:57   #2
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Were the codes clear and the same codes come again? Do you know your compression values?
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Old November 9th, 2018, 07:21   #3
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What is the brand and part number of the glow plugs you replaced the old ones with?
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Old November 9th, 2018, 07:52   #4
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I think there was a recall/reflash of the ecu on 2004's, has that ever been done? Something about 5v vs 7v glow plugs.



How does your cam look?


How old is your starter?
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Old November 9th, 2018, 08:10   #5
Hussman
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I know on my old BEW I had to cycle the glow plugs at least 2-3 times if its under 0 degrees fahrenheit. Mine started -25 quite a few times, but it wasn't liking it. I now have an ALH and have noticed the glow plug light stays on much longer than my BEW did.

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Old November 9th, 2018, 08:27   #6
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You can change the glow plug time with VCDS. Also ALHs usually have higher compression values, which help ignite diesel easier.
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Old November 9th, 2018, 08:36   #7
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Quote:
Originally Posted by k_pt View Post
You can change the glow plug time with VCDS. Also ALHs usually have higher compression values, which help ignite diesel easier.
Not on a 2004 BEW engine without tuner intervention.
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Old November 9th, 2018, 08:38   #8
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Quote:
Originally Posted by JETaah View Post
Not on a 2004 BEW engine without tuner intervention.
Correct, I was assuming that could have been done on Hussmans ALH.
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Old November 9th, 2018, 08:46   #9
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I'll have to check the brand and part for glow plugs replaced..
The ECU reflash is a good question! Thank you for that, I'll check with the dealer
Thanks all for your input
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Old November 9th, 2018, 09:05   #10
BobnOH
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Yes, you need to know what plug goes in your engine, your car may or may not have been modified to use a different voltage plug. Would have been a hardware (plugs) and software (ECU) modification. Harness, relay remained unchanged as far as I know.
Sounds like you're all over that stuff, once sorted out we can move on to the other things.
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Old November 18th, 2018, 18:26   #11
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Just wanted to update this (I hate it when people fix things then don't share the results)
After some investigating it turns out the ecu was flashed for 7v glow plugs. I bought some new ones, and now it starts great in these cold MN mornings
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Old November 19th, 2018, 04:47   #12
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Great!
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