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Question

i have an 87 vw jetta and while i am driving sometimes the car just turns off - what can it be- i had a mechanic changed the fuel pump relay- and the auxiliary air valve as well as the crankcase hose- because he thought that was what was wrong- but after all that it still does the same thing - please help

Submitted: 1188 days and 21 hours ago.
Category: Car
Value: $10
Status: CLOSED
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Optional Information

Optional Information:
1987 Volkswagen Jetta GL 1.8

Already Tried:
changing the fuel pump relay, auxiliary air valve and the crankcase hose

Posted by Geordie 1188 days and 21 hours ago.

Info Request

Hi

I do believe your car is fitted with the Bosch K-Jetronic mechanical fuel injection system.

When exactly does it cut out? Is it whilst you're driving and you have your foot on the gas?

Is it at wide open throttle or just whilst driving casually?

Is it whilst the car is stood still at idle?

Is it after you rev the engine and then take your foot off the gas and the revs fall to idle?

Cheers

Geordie

1188 days and 20 hours ago.

Reply

Reply to Geordie's Post: I think I do - I know that it is fuel injected. sometimes it is while i am driving casually, also it has happened when I am slowing down. Sometimes it has happened when I turn off the car, and go to the store - I come back and it will not start. Usually will have to wait at the very least a half hour for it to start again.

Posted by Geordie 1188 days and 19 hours ago.

Answer

Okay.

Do the electrics fail as well as the engine (dash lights etc)?

Geordie

1188 days and 19 hours ago.

Reply

Reply to Geordie's Post: yes all the electrics go off

Posted by Geordie 1188 days and 19 hours ago.

Answer

Check your ignition switch.

Regards

Geordie

1188 days and 9 hours ago.

Reply

Reply to Geordie's Post: how can the ignition switch have anything to do with it? should I change it out

Accepted Answer

The ignition switch is the primary switch in the circuit and they can fail quite easily. One sure sign is cut out and electrical failure.

Remove the plastic cowelling from around the steering column to gain access to the switch and then check all the inputs and outputs.

there should be a permanent live to the switch via a red wire if I'm not mistaken.

When you turn the key to the on position (2 clicks) 2 other wires should then be live and I believe they are black/yellow and grey in colour, but the colours may not be exact.

If you don't find the lives as above then renew the switch.

Let me know how you get on.

Cheers

Geordie

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Expert: Geordie
Pos. Feedback: 98.4 %
Accepts: 
Answered: 8/23/2006

Mobile Mechanic & Motor Trader

22 years of mechanical experience, and I am the mechanic in my own automotive partnership

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