High Idle...sometimes

by **SHO Mojo** » Wed Sep 03, 2003 5:41 pm

OK, gurus,

Not sure where to begin my diagnosis, so I'd like to see if anyone recognizes these symptoms...

My '89 SHO (mostly stock, with stock electronics) normally idles at 850-950rpm...

Recently it has begun idling at ~1500rpm...but intermittently,

1 - Sometimes this occurs within a minute of start...

2 - Other times this occurs after longer periods of running (10-30min)...

3 - Still other times it does not occur at all.

Most everytime I can "reset" the idle by shutting off the engine, then restarting, from which point I go back to 1 ...

Is this an IAB issue (replaced within last 2 years), or what? :blink:

Thanks for any and all inputs!

Steve C.

by **AutoSHO** » Wed Sep 03, 2003 7:21 pm

I'd say replace the TPS. Sounds like it has a bad spot in it where it doesnt always drop back down to <.95 Volts. You might try adjusting it to a little lower voltage. Just make sure that at idle the sensor voltage is less than .95 volts.

by **Bryan C. King** » Wed Sep 03, 2003 8:54 pm

Definately sounds like the TPS............

by **IT'SHOTIME** » Wed Oct 01, 2003 11:38 pm

while ur out it change your O2 sensor .. :unsure:

by **projectSHO89** » Thu Oct 02, 2003 5:49 am

IT'SHOTIME @ Oct 2 2003, 02:38 AM wrote: while ur out it change your O2 sensor ..

Why????

There is no indication of an O2 sensor problem!

Steve

by **NotSoSlowSHO** » Thu Oct 02, 2003 7:39 am

Do I remember reading that a windstar TPS was a direct replacement? Does anyone have a part number?

lately my idle has been hanging like that as well :blink:

by **NotSoSlowSHO** » Mon Oct 06, 2003 7:16 am

ha... found it:

V6 TPS sensor (Aerostar TPS recall kit)
F19Z-9B989-BA
13.54

by **Dassin** » Thu Oct 09, 2003 9:39 am

I've had my '90 for about a month and a half now, and it has always idled around 1250-1400 or so, very rarely going lower. Is the 850-950 RPM idle that SHO Mojo stated considered normal? If not, looks like I have more work to do :/ Well... it does have 132k on it now, and a questionable maintenance history, so... I guess that's to be expected.

by **NotSoSlowSHO** » Thu Oct 09, 2003 5:34 pm

idle should be 850rpm- 950 rpm, i think. above 1k and its too high.

try erasing the eec memory, and resetting the idle

by **Dassin** » Thu Oct 09, 2003 6:32 pm

Cool, I'll give that a shot tomorrow. Nothing better to do :rolleyes:

High Idle...sometimes

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