91 Ford Tempo auto w/ 220kms

JOE HYATT

MEMBER
1991 FORD TEMPO

I have a 91 tempo auto w/ 220 kms the idle is up and down (erratic) and it ocassionally stalls. I've done plugs, wires, cap, rotor, o2 sensor, egr valve and still nothing. Recently ran KOEO test and came up w/ 3 codes 1) Normal idle not within specified range. 2) canister or egr valve not operating properly. 3)power steering pressure switch out of specified range. I've still to run the "throttle goose test" but I want to know where to start w/ codes 1 and 2 or if you have any other suggestions. PLS HELP good daily driver just needs some lovin'

3 Replies

PEPPERMRJ

MECHANIC
1,158 POSTS

A malfunctioning EGR valve can cause:
Detonation.
Rough idle or stalls on deceleration.
Hesitation or surge.
Abnormally low power at wide-open throttle.

Check the vacuum lines and vacuum source if applicable.
Check the electrical connection and valve function. Was the EGR port cleaned?

Other causes of stalling/surging/fluctuating idle could be.
Electrical:
low battery voltage (battery or bad cables)
Bad wiring or loose connections (Check IAC and TPS)
Failing ignition switch.
Failing ignition module.

Fuel system.
Fuel contamination/quality in gas tank or fuel lines.
Clogged fuel filter.
Weak fuel pressure (Check fuel pressure regulator and fuel pump).
Fuel pump inertia switch.

Air/vacuum system.
Vacuum leaks.
Dirty air filter.

OTHER CAUSES:
Engine coolant level.
Defective thermostat and/or fan switch.
Clogged PCV valve.
EGR valve stuck open.
Exhaust System Blockage.
Poor camshaft timing and cylinder compression.

Just looks like a lot to check. :)

I would also consider cleaning the throttle body, IAC valve and it's port, and using some fuel injector cleaner.

Sometime tapping on the TPS with a srewdriver handle will show up a bad TPS by making the idle fluctuate.

Good hunting and let us know. :Twisted:

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Saturday, February 25th, 2006 AT 9:00 PM

JOE HYATT

MEMBER
3 POSTS

91 tempo auto 220 kms 2.3L

Can you test EGR valve and if so how : As well I wanted to know the same about PFE (pressure feedback sensor) PSP (power steering pressure switch) EVR (egr vacuum regulator solenoid) and the IAC (idle air control/air bypass valve) just hoping I can rule these out as my problem without replacing them all. Thanks for the help be sure to let you know how I make out.

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Sunday, February 26th, 2006 AT 6:50 PM

CHRIS2009TAYLOR

MEMBER
26 POSTS

Hey Joe,
What happened with your problem?
Did you figure it out?
I'm having simular issues and some Lurching/Misfiring symptoms.
The Tempo repair book at the "Canadian tire" store called "Haynes" explains how to check the sensors with a volt meter.
I imagine you don't have the car anymore.

Anyone else have some ideas?

Chris in Edmonton ( june 2013)
chris2009taylor@yahoo. Ca

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Thursday, June 20th, 2013 AT 6:21 PM