[V8] Engine miss and no power

Jeff Goldberg gold123 at ntelos.net
Sun Jul 10 14:18:37 EDT 2005

Car started right up this morning and idled fine, but could not coax
throttle over 1000 RPM...begins to rev and then seems like it cuts off at
1000 and idle drops.  I rechecked the codes with it idling and found 3

2413 Mixture Adaption (an ABH code ???)
2111 RPM Sensor no change in signal
2121 CPT Switch signal to positive

I ran the output test to clear the codes and all three codes reappear.  The
CPT tested Ok.  The RPM sensor tests call for terminals 1 and 3, 2 and 3 to
read open.  I read 2-3 ohms across these terminals.  I also found oil in the
RPM sensor connector which I cleaned out.

After testing the sensors and plugging back in the car ran perfect for about
1/2 a mile then the symptoms returned. The car starts and idles perfect
until the temp. gauge hits the first mark, then it won't idle either.

The fact that the symtoms completely went away and returned so suddenly
leads me to think it's not as simple as fouled plugs.
When it's cold it starts and idles fine. When it's missing it doesn't have
the power to even move in the drive.  Once it's warm it still starts but
misses at idle as well.

What is the best way to clear the codes?  Is there a way to know for sure
that they have been cleared?
Do you think I should go ahead and replace the RPM sensor?

91' V8q

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