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peterpete190
peterpete190, Technician
Category: VW
Satisfied Customers: 27134
Experience:  Over 17 years diagnosing and repairing various model vehicles.
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I have a 02 vw jetta 1.8t with approx. 166k mi. I have fault

Customer Question

I have a 02 vw jetta 1.8t with approx. 166k mi. I have fault codes p0300,-p0304 and p0171. they are misfire on each cylinder and system too rich.
Submitted: 8 months ago.
Category: VW
Expert:  peterpete190 replied 8 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Has anything been checked,tested or replaced to try and locate or repair this fault here at all?

Let me know so we can continue,thanks Pete.

Customer: replied 8 months ago.
far I have replaced fuel filter, plugs and coil pack j1 and 2 cylinder. it is still misfiring and hesitates on acceleration
when cold.
Customer: replied 8 months ago.
I drove about 20 miles from new Orleans to kenner about 30 around trip hwy driving and it shifted smoother when at operating temp
Expert:  peterpete190 replied 8 months ago.

One common component I have seen cause an issue like this here is a restriction in the 3 way catalytic converter.This can plug up partially and cause high back pressure causing misfires on all cylinders as well as the rich codes set and hesitation when accelerating.

If you have not had an exhaust back pressure test done this needs done.This is done with a back pressure tester threaded into the pre catalytic converter oxygen sensor port.Your engine is then run at idle to wide open throttle briefly to see if the back pressure exceeds 1.5 psi.If it does at any time then the catalytic converter needs replaced.This is common as I have had to replace several for this fault here.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Customer: replied 8 months ago.
is the CO sensor going to be located up or down stream on the CC. If you have a diagram that would be great.
Expert:  peterpete190 replied 8 months ago.

It is #8 in the diagram below.Upstream from the CC towards the engine.

https://www.dropbox.com/s/t3gjlr82vqxarx7/ox-09-21.gif?dl=0

Let me know if you need anything else and feel free to rate my help here as this is how I receive credit for my time.Your 5 star rating is appreciated

Thanks Pete

Customer: replied 8 months ago.
I will most certainly rate you info. but should I wait until I have performed the test and repaired the problem? Also, I have 1.8 injection intake vac system
Expert:  peterpete190 replied 8 months ago.

No problem.We can continue as needed here.Let me know if you need anything else.

Thanks Pete

Customer: replied 8 months ago.
Sorry I got crossed up didn't finish my other question. I have an intake vacuum issue as well that may be contributing to the problem. my vacumm lines were rigged by the previous owner and I don't know how to correct them because I have no diagram or knowledge of the intake and vacuum system.
Expert:  peterpete190 replied 8 months ago.

I see.Did you get my answer on your last post on the vacuum diagram info.I just now see you have 2 open questions.

Let me know,thanks Pete

Customer: replied 8 months ago.
I stepped away for a sec and my son closed the screen. I don't know how to get back to the last post can you direct me or repost
Expert:  peterpete190 replied 8 months ago.
Customer: replied 8 months ago.
Nah it didn't work; an error message came up.
Customer: replied 8 months ago.
no problem I will come back. gotta pick the kids up
Expert:  peterpete190 replied 8 months ago.

O.k.,I will re post the answer here.

https://www.dropbox.com/s/yl9w7j3rt5vr07u/e-09-21.gif?dl=0

1 - Tank cap unit
2 - Fuel tank
3 - Fuel delivery unit
4 - Intake hose
5 - Throttle valve control part (J338)
6 - Intake manifold upper part
7 - Fuel rail with injectors
8 - Fuel pressure regulator
9 - Fuel filter
- Installed position: Arrow points in through-flow direction
10 - Evaporative Emission (EVAP) canister purge regulator valve (N80)
- Checking activation:
- Checking function
11 - Test connection
12 - Gravity/overflow - valve
13 - Pressure retaining valve
14 - Change-over valve
15 - Activated charcoal filter
- In rear right wheel housing under the wheel housing liner
16 - Diagnostic pump for fuel system -V144-
- Checking activation:
17 - Air cleaner for diagnostic pump

Thanks Pete

Customer: replied 8 months ago.
Pete I didn't forget to rate you, the pressure tester come in tomorrow ! I'll do the check and rate the results for sure! A friendly reminder no problem!
Expert:  peterpete190 replied 8 months ago.

No problem.Let me know how this turns out and if you need anything else.

Thanks Pete

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