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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 October 21st, 2011, 12:13   #1
weekendwrencher
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Default Rough Idle

Car seems to idle rough sometimes. Especially when I am at a stop sign or stop light and depressing the brake. I let off the the brake and the idle seems to smooth out a little. Any suggestions or ideas of what's going on?
Thanks in advance for any feedback.
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Old October 21st, 2011, 12:39   #2
jettawreck
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Quote:
Originally Posted by weekendwrencher View Post
Car seems to idle rough sometimes. Especially when I am at a stop sign or stop light and depressing the brake. I let off the the brake and the idle seems to smooth out a little. Any suggestions or ideas of what's going on?
Thanks in advance for any feedback.
Automatic or manual??
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Old October 21st, 2011, 13:25   #3
weekendwrencher
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2000 Jetta TDI Manual. Thanks
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Old October 21st, 2011, 14:04   #4
jettawreck
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VW TDIs if you have some throttle and apply the brake the ECU backs off the fueling, but I doubt that you have both brake pedal and throttle at a stop with the manual. That's why I asked.
May be an injector issue. How many miles on the current nozzles and bodies if they're not original? Perhaps if you find someone near you that has VCDS they can log the injector balance at idle for you.
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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 October 23rd, 2011, 13:18   #5
DougInFL
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Mine was running rough at idle the last few days. Been here in northern GA (very cold days) ....Looking forward to Florida in days to come.

The idle on mine smooths out when I get to a steady 1,000 rpm.

I'm thinking it's just a sensor that's not used to the cold weather. Also, my GP light is now flashing. Brake lights are working properly and so is the cruise control.

Any thoughts?

Thanks in advance.
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Old October 23rd, 2011, 19:03   #6
tyrone shoelaces
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Possibly bad glow plugs/glow plug wiring harness
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Old October 24th, 2011, 07:04   #7
jettawreck
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Originally Posted by tyrone shoelaces View Post
Possibly bad glow plugs/glow plug wiring harness

I doubt he is seeing temps when the GPs even activate (sub 45F aprox) in California, unless he's in high altitude area.
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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 October 25th, 2011, 20:04   #8
TomJD
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Is it when you are slowing down and depressing the brake or when you are actually stopped? If it is when you are slowing down, do some research on here about Slow Down Shudder or SDS.
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Old October 28th, 2011, 20:21   #9
weekendwrencher
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thanks for all of your input. I ended up taking off the intake and egr and cleaned them. also replaced vacuum hoses. everything behaving well now. thanks for you input. invaluable.
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