Question about Cars & Trucks
I would start by replacing the spark plugs and wires
Posted on Nov 06, 2012
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Posted on Nov 06, 2012
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Posted on Jan 02, 2017
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
Ok this may be something smal that may be simple to fixs; your plugs are in the wrong cylinder?
Check Your gap size .060 (In thousandths of an inch)
Im not sure of the size of engine please look below for your make?
Fig. 3.8L VIN 1 Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system
Fig. 3.8L VIN K Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system
Fig. 3.8L (VIN 1 and L) Engines Firing order: 1-6-5-4-3-2 Distributorless ignition system
Fig. 3.8L (VIN K) Engine Firing order: 1-6-5-4-3-2 Distributorless ignition system
I hope that this help!
Posted on Jun 08, 2009
is not ford,driverside front close to rad #1,and then2,3,4 [same side]and pass. side front 5,6,7,8 [if only 6cyl you have 123and 456?
Posted on Dec 12, 2009
A code P0303 may mean that one or more of the following has happened:
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Posted on Oct 26, 2011
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