88 V6, Cranks but doesnt start/hard start when hot

[Trent308]

Hi All, just started having this problem.... smogged two days ago (was occurring before that - could not repeat symptoms at shop), no error codes just wont start or hard starting when warmed up. Is there a starting injector/circuit that may be faulty? wait 20 min starts fine.... ? ideas?

thanks!

[Slartibartfast]

Does it run well while hot? I don't know much about the TBI setup but I know on the MPFI trucks a bad coolant temp sensor/plug/wiring can give you issues when it's warmed up.

[Kingman]

I would check the CHTS and the sub harness. When it doesn't start, pull a spark plug and see if its fouled. If it is its probably the sensor giving the ECU a false reading of being much colder than it actually is and flooding the engine. You might also check for spark, ignition coils can fail when they get hot and start working again when they cool off.

[Alkorahil]

I would check the CHTS and the sub harness. When it doesn't start, pull a spark plug and see if its fouled. If it is its probably the sensor giving the ECU a false reading of being much colder than it actually is and flooding the engine. You might also check for spark, ignition coils can fail when they get hot and start working again when they cool off.

 

 

From there oxygen sensor. you also have on the VG30i a dashpot on the throttle that might be stuck as it is winter time.