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CarDoc
CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6457
Experience:  20 years of experience working with European cars. Independent European shop owner and technician.
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1997 VW jetta GT: dies after 30min of driving time..restarts

Resolved Question:

My 1997 VW jetta GT dies after 30min of driving time. It usually restarts in about 8-10 hours. Any advice? Also gives generic code, "low rpm, miss fire...etc ", and sometimes will not give check engine light.
Submitted: 5 years ago.
Category: Car
Expert:  CarDoc replied 5 years ago.

CarDoc :

Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.

CarDoc :

ok, there are a couple of things that can be causing this. Have you done any recent work to the car?

JACUSTOMER-k3j226e7- :

No.

CarDoc :

ok, and do you happen to have a list of the Pxxxx codes that you have seen?

JACUSTOMER-k3j226e7- :

No, I had them written down but lost the paper. They were low rpm and engine miss fire though. Also has not given a code or check engine light for a long time.

CarDoc :

I have a feeling that you have a bad crankshaft position sensor, as they often won't leave behind a fault code, but when they fail, they fail when hot, and they interrupt spark

CarDoc :

it lives behind the oil filter, near the transmission bellhousing

JACUSTOMER-k3j226e7- :

Ok. I notice when I turn the engine it tries to run, so I think Im getting a spark but dies. My thought was throttle body.

CarDoc :

well, there's also a possibility of a cracked coil allowing spark to escape, but this typically is noticed more when it's damp out

JACUSTOMER-k3j226e7- :

Also before this started the car would not start in the rain or humid days.

CarDoc :

ah, that's getting more to the issue

CarDoc :

let's get an ignition coil on there

CarDoc :

do not use an aftermarket coil though. OEM, Beru or Bremi

JACUSTOMER-k3j226e7- :

I did check the coil pack and it looked ok but maybe I should replace anyway. Car has 175,000 miles on it.

CarDoc :

all ABA-engine VW's will need a coil by that time. All of them

CarDoc :

I've replaced hundreds, but trust me on the brand. No off-brand, no Karlyn, no Huco.

JACUSTOMER-k3j226e7- :

Does Bosch make one?

CarDoc :

let me check.....

CarDoc :

I don't believe so, no

CarDoc :

ecstuning.com has good ones

JACUSTOMER-k3j226e7- :

thanks. Any other quick diagnostics I can do that would rule out other problems?

CarDoc :

well, with crank sensors not leaving codes, and the other codes not being helpful other than misfires, I think we can be confident with this being the first, and likely last step

JACUSTOMER-k3j226e7- :

Ok. Thanks a lot.

CarDoc :

sure thing

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