20 Most Recent 1991 Volkswagen Jetta - Page 5 Questions & Answers

Uncontrolled Crank case pressure Failure.

RECOMENDATION:
Replace the Positive Crankcase Ventilation Valve and vacuum line.,

INFO: PCV
This is a valve causes a negative vacuum on the engine while its running, As to say if it had a leak in a valve cover it should not be leaking while its running, only when the engine it turned off.

Hope this tip guides you in the correct direction to solve this problem.

R/
David

check fuse and if thats not problem then see if power u have power at switch if u do then switch is bad

between carb and inlet manifold there is a 1cm thick kind of gasket these are going to dry out and leak when the engine runs and you spay brakecleaner besides de carb on the gasket and you hear any difference in de rpms replace the gasket and it will be ok. you can also try to move the carb while running pull or push and detect this way if you have false airintake.

lift the plastic cover at the bottom of the wiper arm,tighten the nut that is there,the spline in the wiper arm is loose

Injection pump will have to be removed and rebuilt. There is a bushing and seal on the throttle shaft. Pump has to be disassembled to replace it

IT COULD BE IGNITION TIMING OFF.OR A BAD FUEL PUMP.OR STOPPED UP FUEL FILTER.

Verify that you are actually getting coolant flow through the heater core. To do this find the two hoses coming out of the firewall on the passenger side. With the motor at full running temperature check these hoses by touching them. If one is cold and the other is hot you have a flow problem. My manual does not show a control valve on the heater hoses, double check to make sure you do not have this. If you do not and the hoses are one cold and one hot you will have to either flush or replace the heater core.

IF BOTH HOSES ARE HOT
You have a heater door control issue.

time to spray the belts with dressing from autozone or local parts place if this helps replace the belts and have a great day

Check battery voltages to all, and any glow plugs, glow plug condition, as well as make sure relay is staying on as needed.

Get in touch and I'll mail a copy I have.. It is Mk3 init?

common

faulty switch or relay

Locate where the shift cable linkage mount to trans, check for good tight attachment to ball socket, then have some one move shift lever through gears watch to see if cable moves shift arm BOTH directions if not replace cable

look on the sise of the resovior

I had a similar problem and the mechanic diagnosed it as a problem with the ignition coil. So you might want to get that checked.

I think the best thing to do is to get a compression test on the cylinders to see if all are running at max compression when hot as well as cold as if the compression is down then it could be a few things but also TELL me is it a Manual or Auto box in the car ,as that can make a big differance.
Let me know how you get on and send me the info as Above.ASAP

Ron

go to any auto parts place and tell them you need a haynes manual for your car, the codes should be in manual, it only costs about 20.00, or buy a computer codes manual, same price.

alpine is the best julian best sound.