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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

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 August 4th, 2015, 10:57   #1
SHuynhh
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Default Diesel smell at cold startup?

2000 Jetta TDI, my first ever TDI. This is being used as my project car right now but is there supposed to be a smell when it starts cold? althought I do need a whole new exhaust, I thought there was a problem with the exhaust manifold or the injectors. I just wanted to know if there is supposed to be smell at first startup or from "cold"
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Old August 4th, 2015, 13:15   #2
UhOh
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Hard to tell what your sensitivity is, but going from no fuel flowing and cold to fuel flowing and cold start one can expect to smell some odors: I don't much like the smell of gassers, so they tend to assault my senses.

Check around the engine bay around the various fuel lines, injection pump and injectors for any signs of "wet." Best just after you start it cold: if there's an issue it might be diminished as heat expands things.
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Old August 4th, 2015, 13:51   #3
SHuynhh
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Well... the smell goes away after it warms up but the smell does stick around after parking it in the garage and its a really bad smell
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Old August 4th, 2015, 14:39   #4
jettawreck
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I love the smell of diesel in the morning.
It's normal. It doesn't/can't burn real clean when the cylinders are stone cold.
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Old August 5th, 2015, 06:46   #5
SHuynhh
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Oh really? I didnt actually know that cause this is my first encounter with a diesel engine or car overall. The smell usually comes out from behind the engine and after the car is turned off and parked the smell kinda lingers afterwards out of the exhaust.
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Old August 5th, 2015, 06:46   #6
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I had a buddy tell me that the smell is normal but after leaving the car the smell is still there
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Old August 5th, 2015, 07:29   #7
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Walk by an old Ford IDI diesel some time. These things REEK diesel, running or sitting, inside and out! (I know, I've got one!)

On these engines, however, there ARE places where exhaust leaks tend to happen, you might look just to verify. You would typically get extra noise (possible that you're just not able to hear). The flex pipe from the EGR cooler to the EGR. The down pipe.
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Old August 5th, 2015, 07:32   #8
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Perhaps you have a small exhaust leak or a cracked egr pipe.
Diesel exhaust smell lingers or raw diesel fuel (liquid fuel) smell?? Fuel line connectors come up by the passenger side strut tower.
Look for wet/damp spots and have someone start the engine up when cold while you look around the back side of the engine for exhaust leak. Engine cover removal may make that easier.
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2001 Jetta TDI GLS Silver-current driver (salvage)permanently vented-Panzer Plate-Sprint 520s-ScanGauge-CheckTemp III-ZeroStart heater-CAT 2 filter
2003 Jetta GLS Black w/leather (New Project Car) fixer-upper w/broken TB
2004 Cadillac SLS (wife's)
1999 GMC Suburban (It's MN-you need one)
197? Shibura 2cyl diesel 4WD tractor-loader/brushhog (very handy unit)
196? International TD340 Dozer-w/Drott 4-in-1 bucket/back ripper attachment
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Old August 5th, 2015, 16:24   #9
SHuynhh
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Well the whole exhaust system is shot because of rust that'll have to be replaced, only under the car, the smell does come from the back of the engine from the exhaust manifold, but the cold startup diesel smell is noticeable but I've been told its normal but the smell lingers after the car is in park and turned off but I will check around those areas.
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Old August 5th, 2015, 16:40   #10
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Quote:
Originally Posted by jettawreck View Post
I love the smell of diesel in the morning.
It's normal. It doesn't/can't burn real clean when the cylinders are stone cold.
What jettawreck said. What you're smelling is atomized but unburned fuel that was injected during the first few cranks before it fired up. The CAT in the exhaust system is also stone cold and won't do anything until it's up to temperature.

I love the smell of diesel in the morning.

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Old August 5th, 2015, 18:07   #11
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Yeah and from what you guys are saying I feel more relieved now I thought there was something wrong with my exhaust manifold or the egr system itself. thanks a lot guys.
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Old November 19th, 2019, 13:00   #12
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Just a thought , make a smoke can from two air line connectors and a new paint can, fire up a old rag and run compressed air thru to pressurize your exhaust system .... smoke means a leak. Hose, seal etc. Heads up be careful that can is going to get hot! So think through your safety plan. My problem was a return vapor
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Old November 19th, 2019, 19:46   #13
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Quote:
Originally Posted by slowandeasy View Post
Just a thought , make a smoke can from two air line connectors and a new paint can, fire up a old rag and run compressed air thru to pressurize your exhaust system .... smoke means a leak. Hose, seal etc. Heads up be careful that can is going to get hot! So think through your safety plan. My problem was a return vapor
A: old thread
B: a leaf blower and soapy water works much better
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