van won't start
Mariobellavance
10-31-2009, 12:18 PM
Hello I have a 1999 windstar with a 3.8, It won't start unless I depress the gas peddle when I release the gas it will stall.
Could it be fuel filter
Could it be fuel filter
bdahl385
10-31-2009, 01:37 PM
Look at cleaning the IAC (Idle Air Controller) valve... The symptoms could point at this and needs to be serviced from time to time. http://leckemby.net/windstar/windstar02.html
You could also have a bad spot on the TPS (Throttle Position Sensor) and the PCM is not getting a good reading with your foot off the pedal. Does the van run okay as long as you depress the gas a little?
You could also have a bad spot on the TPS (Throttle Position Sensor) and the PCM is not getting a good reading with your foot off the pedal. Does the van run okay as long as you depress the gas a little?
wiswind
10-31-2009, 09:13 PM
A sticking IAC is a common cause of this problem......try cleaning it with WD-40 or Seafoam "deep creep".
The IAC (Idle Air Control) does as it name implies....controls the air into the motor when your foot is off the accellerator.
The PCM uses this to control the idle speed.
If it sticks, it cannot open and your engine will stall due to lack of air.
Cleaning usually solves the problem......and is cheaper than replacing it.
I still have my factory original IAC on my '96 with 216K miles......it stuck once in a while a few years ago......cleaning as I mentioned solved the problem for me
The IAC (Idle Air Control) does as it name implies....controls the air into the motor when your foot is off the accellerator.
The PCM uses this to control the idle speed.
If it sticks, it cannot open and your engine will stall due to lack of air.
Cleaning usually solves the problem......and is cheaper than replacing it.
I still have my factory original IAC on my '96 with 216K miles......it stuck once in a while a few years ago......cleaning as I mentioned solved the problem for me
serge_saati
11-01-2009, 12:20 AM
To check if the IAC is damaged,
disconnect the connector from the IAC valve,
turn the key to ON (without starting) and check voltage between the 2 wires of the connector. It should be between 10.5 and 12.5V (if the battery is charged).
If it's good, it indigates that the PCM is not the cause of the problem. Turn key to off.
Then measures the resistance between the 2 terminals of the valve (not the connector). It should be between 6 to 13 ohms.
If not, replace the IAC valve.
If it's good, measure resistance between any of these terminal and the IAC case ground.
It should be minimum 10kohm. If it's less, replace the IAC valve.
To test the Throttle position sensor (tps), connect the voltmeter between GND and signal pin of the TPS connector (without disconnecting the harness). The signal is positive.
Turn the key to ON. It should be a little bit less than 1V. If it's less that 0.75V, replace the TPS.
Check also the voltage between reference pins and GND, it should be 5V. This is the TPS connector:
http://img267.imageshack.us/img267/6420/tps.jpg
disconnect the connector from the IAC valve,
turn the key to ON (without starting) and check voltage between the 2 wires of the connector. It should be between 10.5 and 12.5V (if the battery is charged).
If it's good, it indigates that the PCM is not the cause of the problem. Turn key to off.
Then measures the resistance between the 2 terminals of the valve (not the connector). It should be between 6 to 13 ohms.
If not, replace the IAC valve.
If it's good, measure resistance between any of these terminal and the IAC case ground.
It should be minimum 10kohm. If it's less, replace the IAC valve.
To test the Throttle position sensor (tps), connect the voltmeter between GND and signal pin of the TPS connector (without disconnecting the harness). The signal is positive.
Turn the key to ON. It should be a little bit less than 1V. If it's less that 0.75V, replace the TPS.
Check also the voltage between reference pins and GND, it should be 5V. This is the TPS connector:
http://img267.imageshack.us/img267/6420/tps.jpg
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