Question about 1997 Ford Escort
- Turned off AC. - Started car - Heard muffled "clunk" from engine compartment. - Idle issues. Will not idle. Stalled. - Required feathering throttle to start. - Required constant pressure on throttle to run. - Ran "fine" at higher rpm. - Typical suspects: Fuel, Spark, MAF, IACV, Timing belt. - Fuel ok. - Spark ok. (Any way to put a timing light on this thing?) - MAF... could probably be cleaned. [will test] - Leaves IACV or Timing belt. I don't want to start the motor multiple times to check the IACV if it is the Timing belt. Is there an "easier" way to check the timing belt?
As far as the timing belt,if it has been on the car 7 years
or 75,000 miles, you just install a new water pump,belt &
all the pulleys & tensioners in one kit,after you check cylinder
integrity,valves,compression & such
A cylinder contribution test is done first with an oscilloscope
& software to do that.
Once the above mechanical condition of the motor is
out of the issue, you move on to other tests
Smoke testing for vacuum leaks,fuel & spark issues,etc.
Can you check timing belt-- if fairly new,yes
You can put a camera wand behind any dust cover
& you can use your scope software again to look at cam,
crank,injector & spark events in relation to when they should
Now the problem ! To find a shop that has that knowledge,
equipment and skill level,not many do.
All your mentioned parts can & should also be component
tested, in the proper sequence, if necessary
What can you do
You can try & get access to check the timing belt
Using a timing light,no,scan tool to look at data yes
You can test some,a few items, maybe,yourself if
you Google & study up some on how to do it
You Tube Video is a place you should spend some
time on any subject
Posted on Jul 21, 2013
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Posted on Jan 02, 2017
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May 15, 2011 | Ford Escort Cars & Trucks
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The Idle Air Control (IAC) valve controls the amount of air that bypasses the throttle valve, which controls the engine idle speed. The IAC valve consists of windings, an armature, a return spring, and a rotary slide. The engine control module (ECM) pulses the voltage to the winding, the opposing forces on the armature by the return spring cause it to maintain a fixed position, adjusting the amount of bypass air to maintain the correct idle speed.
Removal & Installation
Checking Idle Air Control Valve (IAC) Triggering
Fig. IAC Connector
Fig. Showing the IAC Valve
WARNING Do NOT check for ease of movement by prying on the rotary slide with a screwdriver or other tools that could cause scratching or other damage.
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