cameron041764

HELP!!
Hello I have a 1995 GT that starts but won’t keep an idle for more than 1-2 seconds.
Itll turn on and unless I keep revving the engine it dies right away. Not long ago it ran fine, it started to get rough and would cut out at higher rpms

I replaced the IAC valve, cleaned the MAF and replaced the distributor cap/rotor, spark plugs and spark plug wires.
I have a BBK cold air intake, bbk off road x (and for what it’s worth, there’s a disconnect in the exhaust between the end of the X pipe and the rest of the exhaust on one side) I didn’t think that could contribute to The car not running

wbrockstar

Have you tried disconnecting the harness from the maf sensor then starting it to see if it will continue running?? If it runs after you do this,it indicates the maf sensor is bad.When the maf voltage is way out of range,preventing the engine from running and you disconnect the harness,the ECU goes into limp mode & the ECU uses substituted values stored in a fuel/timing table,allowing the engine to run til you replace the sensor.

If the engine wouldn't run after you disconnected the maf harness,hold the gas pedal to the floor then try to start it.If it starts,you've got an engine flood condition occurring.If this doesn't work,hold the pedal down 1/4 of the way then try to start it.If it starts,the ect sensor is bad.

If the tests above didn't work,a defective pip sensor can cause a no start issue because it's signal is used to trigger injector pulse,fuel pump relay activation & spark.Remove the spout plug from the ignition module harness then try to start the car.If it starts when doing this,the pip sensor is bad.If the engine still fails to start after doing this,it doesn't necessarily mean the pip sensor is good.You can disconnect the harness from a injector,insert a paperclip into each terminal on the harness plug,connect a test light between the two paperclips then have an assistant try starting the engine.The test light should flash during crank mode.If it does,the pip sensor is working.

Disconnect the iac harness,turn the key on/engine off,use a meter to test the red iac wire.It should be 10.5-12 volts.The other wire should be 1 volt or less.

Check the tps signal & vref voltage.If signal voltage is above 3.7 volts during crank mode,the ECU will shut injector pulse off because that voltage triggers the "clear a flooded engine mode."Signal voltage should be between .50-1.19volts closed throttle with key on/engine off.Vref voltage should be 5.0 volts.Make sure you don't have any large vacuum leaks also.