10-06-2013, 10:53 PM
hello and good morning Gorky.
most of all that looks ok. maf at .25lb/min is normal. and near 2 lbs, as you gun it , in neutral. all normal.
that right foot action is a bad sign, it say, engine is starving for air.
As you know the ECU set (and ISC) set up all air flow, to start, this is not happening.
This tells me:
the IAC is stuck closed or ISC is dead, and may be the idle switch not closed at idle (TPS) (if the switch dont close, the ECU will fail to operated the ISC correctly (dead ISC for start and idle)
if not a lack of air?, then the EGR is stuck wide open, (adding lots of air helps when this happens{EGR leaks}) with an index finger, exercise the egr main diaphragm
and see that it closes, (thunk closed) if not its bad.clean that.
if fuel pressure is good?, then you have plenty of fuel flow.
p300 freeze frame is just the last failure. recorded the last DTC. that failed stores a freeze frame.
What counts live DTC and pendings.
is car starting hot ok.? fails only cold?
are the spark plug fouling?
do you have full power, either hot or cold coolant.
Theory:
failed starts, can be flooding due to injector leaks.
and holding throttle WOT, ECU cuts all fuel , cranking, clearing said flood and a huge black cloud at tail, got black cloud?
if not, then it was not flooded ,
if WOT crank ups , start the car, it's means lack of air. why?
when you crank the engine, I believe the MAF is ignored and the ECU has rules for startup air, it has control of the isc and knows the behaviour
of the (thermal air rates) IAC, and adds an exact fuel rate based on some simple rules (a table) cranking. colder richer.
for a given coolant temperature, the fuel rate is fixed cranking , so if adding air helps that means lack of air,cranking (or EGR stuck wide open)
THE MAF IS pretty much useless at low cranking RPM/s 100 to 300 rpm , due to its non linear nature at that low speed, inaccuracy and just heating up.
This fact explains why the cranking rules are the way they are ( ISC, IAC, and temperature tables)
this knowledge help to understand , poor cranking performance.
Is is a 3 liter FORD MAF (ecu TABLE PLOTS, fooling the ECU. (this is very accurate, plot) shows the nonlinear nature of the beast.
good luck to you .
most of all that looks ok. maf at .25lb/min is normal. and near 2 lbs, as you gun it , in neutral. all normal.
that right foot action is a bad sign, it say, engine is starving for air.
As you know the ECU set (and ISC) set up all air flow, to start, this is not happening.
This tells me:
the IAC is stuck closed or ISC is dead, and may be the idle switch not closed at idle (TPS) (if the switch dont close, the ECU will fail to operated the ISC correctly (dead ISC for start and idle)
if not a lack of air?, then the EGR is stuck wide open, (adding lots of air helps when this happens{EGR leaks}) with an index finger, exercise the egr main diaphragm
and see that it closes, (thunk closed) if not its bad.clean that.
if fuel pressure is good?, then you have plenty of fuel flow.
p300 freeze frame is just the last failure. recorded the last DTC. that failed stores a freeze frame.
What counts live DTC and pendings.
is car starting hot ok.? fails only cold?
are the spark plug fouling?
do you have full power, either hot or cold coolant.
Theory:
failed starts, can be flooding due to injector leaks.
and holding throttle WOT, ECU cuts all fuel , cranking, clearing said flood and a huge black cloud at tail, got black cloud?
if not, then it was not flooded ,
if WOT crank ups , start the car, it's means lack of air. why?
when you crank the engine, I believe the MAF is ignored and the ECU has rules for startup air, it has control of the isc and knows the behaviour
of the (thermal air rates) IAC, and adds an exact fuel rate based on some simple rules (a table) cranking. colder richer.
for a given coolant temperature, the fuel rate is fixed cranking , so if adding air helps that means lack of air,cranking (or EGR stuck wide open)
THE MAF IS pretty much useless at low cranking RPM/s 100 to 300 rpm , due to its non linear nature at that low speed, inaccuracy and just heating up.
This fact explains why the cranking rules are the way they are ( ISC, IAC, and temperature tables)
this knowledge help to understand , poor cranking performance.
Is is a 3 liter FORD MAF (ecu TABLE PLOTS, fooling the ECU. (this is very accurate, plot) shows the nonlinear nature of the beast.
good luck to you .
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