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Wolfgang
Wolfgang, VW Master Technician
Category: VW
Satisfied Customers: 4660
Experience:  Senior VW Master Tech 15 yrs
19871424
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2005 jetta runs good but misses at idle

Customer Question

2005 jetta runs good but misses at idle
Submitted: 1 year ago.
Category: VW
Expert:  Kevin replied 1 year ago.

Hi im kevin is engine warning light on ? Have you had fault codes read ?

Customer: replied 1 year ago.
engine light is on an blinks when idleing there is codepo302
Expert:  Kevin replied 1 year ago.

Ok the first thing i would do is swap ignition coil from cylinder 1 to 2 and clear fault codes and see if missfire moves with coil .the ignition coils are the most common failure

Customer: replied 1 year ago.
Ok we have an extra coil pack we will put on.it . An vacumn is about 13 pounds
Expert:  Kevin replied 1 year ago.

Vacumme or compression ?

Customer: replied 1 year ago.
Vacumn
Customer: replied 1 year ago.
But runs great above 5 miles an hour
Expert:  Kevin replied 1 year ago.

Ok vacumme wont be your issue on this one have you swapped coil ?

Customer: replied 1 year ago.
It is a coil pack i have another one so i will swap them
Expert:  Kevin replied 1 year ago.

Ok let me know if there is improvement

Customer: replied 1 year ago.
Ok i will thanks
Expert:  Kevin replied 1 year ago.

Please remember to rate my service and come back to me

Customer: replied 1 year ago.
Ok put other coil pack seemed to run good for a few minutes then got warm an code 302 came back
Expert:  Kevin replied 1 year ago.

Ok the next step would be to have compression checked to make sure me hanically everything is good

Customer: replied 1 year ago.
Ok i will check conpression but last time it was 110
Expert:  Kevin replied 1 year ago.

Let me know readings for all cylinders

Customer: replied 1 year ago.
Ok
Expert:  Kevin replied 1 year ago.

Il wait for your response

Customer: replied 1 year ago.
Ok numder one is 100 number two is 100 .three is 80. Four is 80
Expert:  Kevin replied 1 year ago.

Ok so you've ruled out cool and compression next step would be to swap an injector from cylinder 2 to see if misfire follows

Customer: replied 1 year ago.
Okay I'll switch them right now
Expert:  Kevin replied 1 year ago.

Let me know how you get on

Customer: replied 1 year ago.
Okay swapted the injectors erased code still got 302 erased again drove it still po302
Expert:  Kevin replied 1 year ago.

Ok im gonna opt out see if another tech has any ideas

Expert:  Wolfgang replied 1 year ago.

Thanks for choosing Just Answer . I'm Wolfgang here to help!!

I am confident we can resolve your problem together. Please
understand that I don't know your skill level. In most cases when you have a problem
with the way the vehicle performs, specialized tooling is required to acquire computer
data/information or engine testing results. We didn’t build these complicated vehicles; we
just diagnose and fix them. Also understand that I can't see, smell, hear, or touch the
vehicle either, so it may take a few replies to get to satisfactory results. I am also going to
direct you with the fastest, easiest and most common things to check first. Please be
patient and permit me to do what I do best.
I also try to give all of the information you may need, expecting a “positive rating” in
return. I will also continue assisting you after you have rated me, if necessary. If there
is any reason I cannot get a positive rating, please let me know why “in advance”, so I
can go another direction for you. I am sorry you’re having this problem; I’ll help you
through it.
Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail.

what make and model scan tool are you using please?

thanks

Customer: replied 1 year ago.
Hello wolfgang i have a kal 9640enhanced scan tool
Customer: replied 1 year ago.
Kal equip tm 9640
Expert:  Wolfgang replied 1 year ago.

what happens if you feed some carb cleaner in the intake does the idle smooth out?

Customer: replied 1 year ago.
No it stays the same or shakes wirse.above 20 car runs perfect
Expert:  Wolfgang replied 1 year ago.

if you pull the plug wire out a little while running do you hear the snap of electrical voltage ? pill out aboyt an inch

Customer: replied 1 year ago.
i hear the snap when i pull wire away
Expert:  Wolfgang replied 1 year ago.

need to swap injectors then to see if that moves most likely an injector is stuck closed

Customer: replied 1 year ago.
Tried that did not change. erased code po302 an came back code 302 after i erased code twice
Expert:  Wolfgang replied 1 year ago.

do you have a leak down tester . i wonder you have a sticking valve or a pumped up lifter

Customer: replied 1 year ago.
No pump down tester any way else i can check it.i could see when i pull wire away engine did not change rpm
Expert:  Wolfgang replied 1 year ago.

this is what we have you have swaped plugs, wires,injector , coil and compression test and no change the last test is a leakdown test to see if you have a valve or lifter hanging up. with all of the tests it sounds mechanical .

let me ask you this was the timing belt broke or changed recently?

Customer: replied 1 year ago.
timeong belt was changed
Expert:  Wolfgang replied 1 year ago.

by you ? and if so was it broken before changing it?

Customer: replied 1 year ago.
know w e changed head.lifter had hole in it.
Expert:  Wolfgang replied 1 year ago.

do you have any pics of the head and lifter etc... the more the better

Customer: replied 1 year ago.
Ok o will take some pictures
Expert:  Wolfgang replied 1 year ago.

thanks

Customer: replied 1 year ago.
How do I send you pictures
Customer: replied 1 year ago.
i will put air in cylinder an see if it holds right
Expert:  Wolfgang replied 1 year ago.

there should be a paper clip icon where you can sent the pics

Customer: replied 1 year ago.
Did you get pictures
Customer: replied 1 year ago.
Okay i made a homemade pressure tester for cylinder seems to be holding pressure
Customer: replied 1 year ago.
Please get back to me Wolfgang wE are so close I know you can do it you're really good at this
Customer: replied 1 year ago.
Wolfgang You still with me