1990 Escort GT - Throttle Position Sensor, Idle voltage

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

sleepdog@optonline.net - 12 Oct 2006 17:56 GMT

Just searching around the 'net yielded a few pointers about the TPS
output voltage at idle... seems like most Ford vehicles expect the TPS
to output just under 1 volt. I have mine set to output 0.9 volts via
the throttle plate stop screw. Just curious if this is about right

I know I have to pull the IAC harness off and check the idle speed. I
don't seem to have any flat spots on this TPS, voltage creeps up to
about 4.65 volts if I turn the pot all the way.

Thanks!

Reply to this Message

Backyard Mechanic - 14 Oct 2006 02:23 GMT

> Just searching around the 'net yielded a few pointers about the TPS
> output voltage at idle... seems like most Ford vehicles expect the TPS
> to output just under 1 volt. I have mine set to output 0.9 volts via
> the throttle plate stop screw. Just curious if this is about right

One thing you DONT do is adjust the throttle stop screw! whoever
suggested that on the net, should get a nasty virus on their computer
every week.

What problem were you trying to 'fix'?

When you get the original prob resolved, set the idle, iac-disconnected,
to 750 rpm, assuming 4 cyl.

> I know I have to pull the IAC harness off and check the idle speed. I
> don't seem to have any flat spots on this TPS, voltage creeps up to
> about 4.65 volts if I turn the pot all the way.

I found the only way to really find a glitch in the carbon track is to
use an O'scope.. hardly worth the trouble, considering the low cost of a
new one.

Signature

Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

Reply to this Message

sleepdog@optonline.net - 15 Oct 2006 05:10 GMT

> One thing you DONT do is adjust the throttle stop screw! whoever
> suggested that on the net, should get a nasty virus on their computer
[quoted text clipped - 4 lines]
> When you get the original prob resolved, set the idle, iac-disconnected,
> to 750 rpm, assuming 4 cyl.

No a while back I had a huge air leak in the intake manifold and
finally fixed it with new gaskets. While I was driving it the leak was
so bad turning down the stop screw lowered the idle a few hundred rpms
and made life bearable for a while. It was my daily driver so taking
the intake apart wasn't an option for me until I got another vehicle
and tore this one down in my spare time. I was just curious if there
was an "ideal" voltage for this model or Fords in general. Seems like
just under 1 volt is the norm. Engine runs perfectly to specs now with
a new set of gaskets and what not.

Thanks!

Reply to this Message