Question about Volkswagen Beetle
About P0304, checked coil pack w/ohmeter, 14.8 and 15.9 on all 3 pair which should be
good; resistance might be good but have you checked both coil packs and wires
to see if there are misfires when spraying theses components with water ?
I dont mean for you to use a garden hose, just a sprayer with water in
it, start car and spray on coils and wires, should see some sparks fly.
Also, check the vacuum lines. The hard plastic ones split at the force fit junctions particularly the large one going thru the firewall. The cotton jacket hosing is **** also.... That you are blowing rich smoke shows the ECM is dumping fuel to compensate for extra air in the system which causes a lean out pre-ignition or the plugs aren't firing. Other, check the brown ground wires next to #1 coil for a solid connection, both common problems.
Then, about P0506 code (Idle Air Control System RPM Lower Than Expected) is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
Potential Symptoms: Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
Causes: A P0506 DTC trouble code may be caused by one or more of the following:
Test it and tell us news.
Posted on Jul 14, 2010
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Posted on Jan 02, 2017
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