To start the car I have to crank it once for a short time. Even If I crank
longer it won't start. Then I turn the ignition off completely and start
again and runs immediately. There was no service done prior to the Check
engine light coming on. The wiper voltage seems very smooth and stable. I
haven't measured the supply voltage while having the engine running yet.
Everything else seems to run good: idle speed, kick down response. So would
you recommend an engine cleaning first (engine compartment wasn't cleaned in
a loooong time) and then a rework of the connectors?
Thanks for all of your advice.

"Stephen Cowell" > wrote in message
. ..

"reigelser" > wrote in message
news
> It is an automatic transmission. What is the wiper return voltage? The
> other
> voltage I can measure on the TPS besides the ~200mV to ~4V?
> I check the message with an OBD Reader. P0123 I think is the number or
> P0124, don't remember right now. Are you referring to the Check Engine
> Light
> flashing when you mension a 24 and a 15?

Yes... too cheap to get the OBD. '124' would correspond to
the '24'... TPS.

Start thinking about things like the ground wire
between the engine and the firewall.. this is a
known problem point. Doug has the right
idea... make sure all connections are clean
and tight.

Problem starting... to start an EFI vehicle, you
should keep your foot *off* the gas until the
vehicle has started... no need to touch the
gas until you take off. You're doing this,
right?

Has other maintenance been done recently?
Does the engine run smooth once it starts?
Describe what you have to do to get it
to start (i.e. grind long, grind twice, feather
throttle, etc.).

The TPS is basically a potentiometer, with three
wires going to it... supply, wiper, and ground. The supply
is a regulated voltage, sent by the computer and used
by the computer as a reference. If this is moving around,
the computer may have unfixable problems (blown regulator
pass transistor, etc.) or another sensor or connection may be
screwing up your TPS reading. The wiper voltage is the one that
changes as the throttle plate opens and closes... it should
track the position of the gas pedal steadily. The wiper
carries your 200mV to 4V.
__
Steve
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