Question about 1988 Volkswagen Fox

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My 1988 vw fox misfires when cold. I have a problem where my car runs very rich and misfires after sitting overnight. It runs rich and smokes alot and then it will randomly fun PERFECT! the last time I drove it to work and it ran great and then i parked it, 8 hours later I started it and it was misfireing, I then kept it running for about 30 min with it misfiring and it finally woke up and ran correctly. It starts fine everytime. Ive checked the spark and it has spark. It has to be a fuel/air delivery problem. What would be causing this?

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  • 29 Answers

Sounds to me that you may have a vacuum leak or leaks.

You can spray starting fluid,spareingly on and around the intake while the car is running.
And look and listen for the engine to rev up, replace and or tighten hoses or gaskets.
Be careful to not have anything,loose fitting to get tangled up while the engine is running.

Posted on May 05, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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j_del
  • 1586 Answers

SOURCE: 1999 vw jetta 2.0

Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

Posted on Sep 02, 2008

  • 345 Answers

SOURCE: 03 Passat 2.8l 6cyl Multiple Misfires and multiple DTC's

that souns like an airflow meter problem,you will need to sort the misfire out first as this will cause all sorts of fuelling issues,the secondary air flow is from the cold start pump but will only effect the emissions when cold.effiency below threshold could be the cat or rear lambda but pointless doing any further diagnostics untill the misfire has gone,check the air mass in measuring blocks or advanced measuring blocks this should give you actual and specified limits if its vag.com(vcds)

Posted on Jan 02, 2009

joboo1
  • 257 Answers

SOURCE: 98 vw beetle misfiring after rain. New plugs, coil cas cracks????

Hi, Yes it certainly could be especially if water gets in. You should also check the distributor cap. The misfire sounds like an arcing problem so it would have to be one of those two things since you changed the rest. Good Luck!

Posted on Feb 25, 2009

bunnydawg
  • 5158 Answers

SOURCE: Eratic idling and misfiring under pressure

confirm that the fuel pump delivers the proper pressure to the injectors

Posted on Mar 08, 2009

  • 119 Answers

SOURCE: MISFIRING ON CYLINDER 1 VW POLO 1.4 3CYLINDER

I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

Posted on Jul 23, 2009

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