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General Information => Troubleshooting => Topic started by: RabbitJockey on October 18, 2006, 06:00:46 pm

Title: rough idle
Post by: RabbitJockey on October 18, 2006, 06:00:46 pm

any reasons for a rough idle on a 1.6 td? my car is at 1000-1100 idle and it seems rough, and i know before it seemed fine and i had at liek 700 and i couldn't even feel it, it's not missing or anything and it runs strong... could be injectors or maybe bent valves or something?

Title: rough idle
Post by: sethyboy85 on October 18, 2006, 06:25:15 pm

It's been cool out here lately, glowplug out?

rough warm or rough cold?

What kind of fuel have you been running?

How much boost were your running last night?  :wink:

Pull an injector and see if the seal is carboned up (bad spray pattern will result rough idle but smooth driving)

Title: rough idle
Post by: burn_your_money on October 18, 2006, 07:02:07 pm

are all your motor mounts good?

Title: rough idle
Post by: RabbitJockey on October 19, 2006, 07:44:59 pm

i know both trans and the front mount are all good, and the passenger side should be decent as i remember when we did the motor swap, it does it warm and cold, but it's a relatively new thing.  so i wouldn't want to think it's the injectors...

Title: rough idle
Post by: burn_your_money on October 19, 2006, 07:49:19 pm

Run a compression check and see if you have a shot cylinder

Title: rough idle
Post by: 1slowvw on October 20, 2006, 10:09:30 am

My engine had a really rough idle after i overheated the thing, turns out i had warped the head and scored a piston. The thing ran but it was rough.

            1SlowVW

Title: rough idle
Post by: jtanguay on October 21, 2006, 09:36:04 pm

mine went downhill from an overheat too... stupid fan died on me... one reason I hate a/c models...

Title: rough idle
Post by: Powjetta on October 23, 2006, 07:32:22 am

I replaced the front mount and the passenger side mount on mine and it really made a difference.  I couldn't tell til I had them out side by side how much tighter the new mount was.  If it's just at idle and not when the rpm's are up then I would replace mounts.

Title: rough idle
Post by: RabbitJockey on October 25, 2006, 06:07:59 pm

it could be the motor but this thing runs strong and pulls like a mule, puts a hurting on alot of cars in town haha

Title: rough idle
Post by: jtanguay on October 26, 2006, 08:16:43 am

right before I had my engine fixed from the overheat, it would shake/vibrate pretty bad.  it just kept getting worse too :(

Title: rough idle
Post by: jtanguay on October 26, 2006, 05:20:54 pm

i will add that my older '86 jetta td vibrated pretty bad.  we're talking some mad dash vibrations.  i thought for sure it would vibrate itself to death  :lol:  but other than hard cold starting, it just kept purring along!  it went to its grave before i could kill it myself though :(  turbo in that thing was weird too... kicked in at 100km/h and brought me up to 110km/h hehe try explaining that to the officer...  and i attribute all of that to bad compression.  hopefully your motor doesn't have bad compression