the egr valve is sticking open , they all do that every 50k or so miles.
the 400s , is detected with the EGR maP VALVE. there is 2 tests, driving , one test to be sure it flows and one to make sure it closes.
it watches vacuum reading from this EGR map. to do that, most times its correct , barring any , huge vacuum leaks.
505 just means the ecu lost control of idle speeds, which you can see it did at 560
800 is normal, hot.
the egr loves to stick open just as you roll to a stop and idle falls below 800. when you see that, its EGR sticking, because at this moment, its commanded shut.
glad to see maf is reading good ! Great work finding that.
if MAF was dead, sure idle can drop. as it works at idle too.
ok if sure the egr is closed, and has low idle. hot.
and sure the tps idle switch is closed, at 0v not 5volts.
then you can unscrew the bleed, idle screw.
the correct way , is set ISC idle duty to 50% using steps for that.
but you can play with it, its harmless. this bleed is metered air, and good.
if the ISC valve (electric) is not stuck, the bleed screw opened ,my wake it up.
as you turn it , the isc way, come on line and open more and idle comes up. THe ecu is programmed to 800 rpm, (a servo)
it may have been set wrong to help hide a dead maf.
looking better, cheers !
the 400s , is detected with the EGR maP VALVE. there is 2 tests, driving , one test to be sure it flows and one to make sure it closes.
it watches vacuum reading from this EGR map. to do that, most times its correct , barring any , huge vacuum leaks.
505 just means the ecu lost control of idle speeds, which you can see it did at 560
800 is normal, hot.
the egr loves to stick open just as you roll to a stop and idle falls below 800. when you see that, its EGR sticking, because at this moment, its commanded shut.
glad to see maf is reading good ! Great work finding that.
if MAF was dead, sure idle can drop. as it works at idle too.
ok if sure the egr is closed, and has low idle. hot.
and sure the tps idle switch is closed, at 0v not 5volts.
then you can unscrew the bleed, idle screw.
the correct way , is set ISC idle duty to 50% using steps for that.
but you can play with it, its harmless. this bleed is metered air, and good.
if the ISC valve (electric) is not stuck, the bleed screw opened ,my wake it up.
as you turn it , the isc way, come on line and open more and idle comes up. THe ecu is programmed to 800 rpm, (a servo)
it may have been set wrong to help hide a dead maf.
looking better, cheers !
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