Join Date: Sep 2008
Location: Fruitland Park,Florida
Get a fuel pressure tester and hook it to fuel rail. Key on prime should be around 43 psi. With engine idling pressure should be mid 30's psi. And at least 40 psi for other running conditions.
Tape gauge to windshield. See if fuel pressure drops right before engine stalls. Have you installed a new fuel filter? It needs to be changed about every 30K miles. Also there is a filter sock on the fuel pump pick up tube. It can get mostly blocked. And this can cause intermittent stalling. As well as clogged regular filter.
Does your security light come on, then cycle off when you turn key on? This is normal operation for security system. If light stays on or comes on when your driving, car can stall do to security system cutting fuel injector operation.
You need to buy a PC based oscilloscope. This is only 100% way of testing low & high resolution opti signals. Funny thing about opti codes is; if both low & high res signals fail intermittently, or all the time, no code will set. So test low & high res signals with scope. When engine stalls, see if low or high res signals either drop out completely, or change wave form from it's normal square wave.
PC based oscilloscope is around $70 on Ebay, Amazon, etc.
Last edited by cocobolo95; 07-30-2019 at 03:31 PM.