[Shotimes] engine problem, please help with diagnosis

[George Fourchy]

On Wed, 4 Jun 2003 15:55:11 -0500, Steve Weinrich wrote:

>IAB valve.
>
>It is responsible for controlling idle.  When it goes bad, strange things
>happen, including every symptom you mentioned.
>
>Try cracking the throttle 1/4 way while cranking and see if it starts.  If
>so, the IAB is probably the fault.

I agree...I'd check this little devil.  With the engine idling, unplug the IAB.  The
engine should quit.  If it doesn't it's bad.  The ones I've seen will be in many
different positions at idle...most too fast, a few too slow.  But the engine speed
WILL NOT change when unplugged.  That's the clue.


As far as the long cranking, try to monitor the fuel pressure while you are cranking
it...plug a gauge into the fuel rail, then crank it.  If it is building up more
slowly than normal, it might be the fuel filter...Lowrider needs a fuel filter and
does the same thing.  A test for this would be to turn the key on, let the pump run,
then turn it off again three or 4 times.  If it starts instantly, it is a fuel
pressure problem.  Now you know what to chase...do the easy stuff first.  Filter,
then the pump items.

George