idle dips down real low no oil psi

[geno414]

i have never had this problem before but now when i start my carit will not idle it will go from 20psi of oil to nothing dip down in rpms all most die come back a/f will go crazy this is happing now more and more when i am at stop lights or sitting and its pissing me off the shop said i have no vac boost leaks so why is this happing now ? how do i fix this ?

now it is doing it all the time i dont know what happened ???

 

[Operate]

This happen at idle, and low cruise speeds? Just throwing an idea out, it could be you're coolant temperature sensor. If it is faulty the ecu could be enriching the fuel so much that it's killing the engine. if you're afrs are dropping in the 8's 9's or lower that could create these symptoms.

I am assuming you're oil pressure drop is associated with the engine dropping in rpm due to the erratic air fuel ratio when in closed loop. Could even be the factory O2 sensor as well giving the ecu problems understanding what the afr is. That is if you are using the factory O2 sensor for the ecu.

Again just throwing ideas out there.

 

[geno414]

This happen at idle, and low cruise speeds? Just throwing an idea out, it could be you're coolant temperature sensor. If it is faulty the ecu could be enriching the fuel so much that it's killing the engine. if you're afrs are dropping in the 8's 9's or lower that could create these symptoms.

I am assuming you're oil pressure drop is associated with the engine dropping in rpm due to the erratic air fuel ratio when in closed loop. Could even be the factory O2 sensor as well giving the ecu problems understanding what the afr is. That is if you are using the factory O2 sensor for the ecu.

Again just throwing ideas out there.

It happens when I first start my car or any time I start my car and when I am at a stop light or idleing and my a/f does not go rich it goes lean I have a new coolant temp sensor oem and dsm lknk shows nothing wrong in my longs I am going to do a bl test to see what's going on with that and also saw thag I shluld unplug my isc motor and then adjust it and plug it back in ? Don't see how thaf will help. This problem just started it does not idel hi it actually drops in idle and all most dies and it catches itself before it dies and brings it back up.

 

[Afizzle]

okay if your shop says you dont have any vac leaks you should probably not stop there. You should perform a leak down test yourself, followed by a boost leak test. Sounds like a huge boost leak somewhere. Is your BOV recirculated?