My 1993 2.0 Jetta is hard to start. It also stumbles in first gear when the engine warms. I have replace the plugs, distributer cap,roter, clutch, fuel filter, air filter, and clutch. I also cleaned the mass flow air sensor. I still can't get my car to run right.
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Re: hard to start
Remove the air hose from the air box to intake manifold.It'sabout 4 inches in diameter and corrugated. Check to see that it ain't cracked or pierced. If it is, replace it. On volks for some reasom the mass air flow (located in the air box) could be defective without triggering the check engine light.
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sounds like the engine is misfiring .. often thats caused by arcing of aging ignition wiring and distributer cap ... you can change the following items:
spark plugs , distributer cap, rotor and ignition wiring .. that often fixes problems with that year car ..
3 things make an engine run, fuel, electrics and gearing, first thing, remove the cap and crank the engine, determine if the rotor is moving, this will eliminate a broken cam, sprockets, chain or broken teeth on the distributer. next with the ignition lights on rotate the roter button by hand in between contacts, you should hear and see small spark, replace the cap and crank engine with a plug lead off, ask a friend to see if it is sparking onto metal nearby. Next remove fuel line and crank engine to see if fuel pushes from the line. then that leaves gearing, timing must be correct, check the lead numbers are in correct firing order and timing is right. Hope this guide helps you, Good luck
You need to replace your distributor. There has been many problems with these. I had the same problem with my 1993 villager and had tried many different things and none worked. I went to a junk yard and got a used distributor and now it runs fine. I would try this before anything alse.
Well, I would replace the air filter, make sure the air hose from the air filter to the intake is not kinked or blocked and check for vacuum leaks. If these are all fine, I would check the fuel pressure as it is possible the pump is weak and not supplying enough fuel.