Posted to Technical Discussion Forum on 3/27/2015
Re: Volkswagon intermitten misfire very hot
It is still quite possible that some or all of the injectors
are drawing enough current to heat up the driver circuits in
the ECU. The faster the engine is running, the faster those
transistors are going to heat up. Once they get hot enough,
they should shut down until they cool off.
I'm not talking about a dead short or open. I'm thinking the
insulation in the injector windings has broken down to the
point that a few windings are touching. This would cause the
injectors to draw a little more current than the ECU drivers
What is the peak current reading for each injector? The
resistance specification for those injectors is 14-21.5 ohms
(according to AllData). Based on that, I would replace them
all if any are drawing 1 amp or more.
Hubert, North Carolina, USA