try to know i cant see car or you,
if the PO turned every screw on car wrong , i cant see that, and is common
they see it mess up and Amateur fiddles (not you , them) every screw on car,
TPS wrong
stop screw wrong
slack wrong (1 to 3 cables)
bleed set wrong
and more.
that is why new cars all this was removed. all of it.
TBW and fixed spark hard landed crank sensors, with no adjustment allowed !all things are 100% under computer controls , not even lash can be set.
or they (PO) do that to hide a REAL problem. PO previous owner, or the Devil him self?
all gone. and much better i guess.
OBD1, oops vast things to mess up , plus all the normal stuff.
tell me there are no leaks behind the MAF.>? ok>
a leak there, too big and the engine injections go lean, beyond 02 (command authority) and surges.
lean = surge. ( comments are HOT engine, yours is perfect !)
but only if the bad is so bad the ISC cant keep up. see? (we call that outside its command authority)
the ISC (servo) can NOT correct the following RPMs. (by any cause or fault causing this.)
about, there is no spec. on this, varies by out door temp and engine wear
1: below 400 rpm the isc goes dead or hunts. (EGR stuck open is classic here)
2: above 1200 rpm the is goes dead(off line) or goes nuts or hunts. ( iac stuck open or bleed turn out 100% ) most true vacuum leaks with maf engine drop idle speeds but not if fault# 2 is engine stuck rich now) sadly no scan tool so see fuel trim,.. so , hard to diagnose.
if the ISC does the hunt that is illegal now in the usa. (wiki toyota 1billion dollar law suit on that , and not there fault either) oddly toyota is clean suzuki is(was) dirty. the IRONY ! of that SHOCKS me,
if the lean-ness only causes the hunt alone, that is just bad luck. (hunt = surge ,ok?) stuck lean or stuck rich is a first order failure not idle controls.
idle is the last thing , to work after all else is ok, see?
IN modern car we go, gee the fuel trim goes nuts (lean) as then engine surges slower, oops that is fix first thing, on OBD2 cars, not surge.
if you worked on carb cars it did this all the time , no idle controls then. zero. no puters, nada. just pure mechanics then.
so if carb fuel mixtures are wrong so will be idle speeds. RPM.
if AFR is normal, air leaks now , cause lower rpm (normal = lean = less power and lower rpm) and surges. lean burn = surge.
if AFR is rich (choke on?) and air leaks now, the engine screams, and no surge. and a danger to drive (teens? driving? )
the same rules apply here.
the AFR if wrong , can cause surge. or gross rich misfire, that is not really a surge, its just misfiring, heard and felt. and even seen.
now demo of bad
all 8v TBI cars 89-95
defeat the dash pot by pulling its vacuum hose, (even plug the end with golf tee (no can suck air)
NOW see the silly suzuki ECU surge the hell out of the isc, (illegal that is now)
and is a danger. to many, not me grand-dad say , "son you can turn the key off or go to neutral in 1 second flat, learn that son"
or any large vacuum lean, and omg, it surges like a PIG with 100% power on tap . shift to drive and it burns rubber.. on ice, oops worse.
if the PO turned every screw on car wrong , i cant see that, and is common
they see it mess up and Amateur fiddles (not you , them) every screw on car,
TPS wrong
stop screw wrong
slack wrong (1 to 3 cables)
bleed set wrong
and more.
that is why new cars all this was removed. all of it.
TBW and fixed spark hard landed crank sensors, with no adjustment allowed !all things are 100% under computer controls , not even lash can be set.
or they (PO) do that to hide a REAL problem. PO previous owner, or the Devil him self?
all gone. and much better i guess.
OBD1, oops vast things to mess up , plus all the normal stuff.
tell me there are no leaks behind the MAF.>? ok>
a leak there, too big and the engine injections go lean, beyond 02 (command authority) and surges.
lean = surge. ( comments are HOT engine, yours is perfect !)
but only if the bad is so bad the ISC cant keep up. see? (we call that outside its command authority)
the ISC (servo) can NOT correct the following RPMs. (by any cause or fault causing this.)
about, there is no spec. on this, varies by out door temp and engine wear
1: below 400 rpm the isc goes dead or hunts. (EGR stuck open is classic here)
2: above 1200 rpm the is goes dead(off line) or goes nuts or hunts. ( iac stuck open or bleed turn out 100% ) most true vacuum leaks with maf engine drop idle speeds but not if fault# 2 is engine stuck rich now) sadly no scan tool so see fuel trim,.. so , hard to diagnose.
if the ISC does the hunt that is illegal now in the usa. (wiki toyota 1billion dollar law suit on that , and not there fault either) oddly toyota is clean suzuki is(was) dirty. the IRONY ! of that SHOCKS me,
if the lean-ness only causes the hunt alone, that is just bad luck. (hunt = surge ,ok?) stuck lean or stuck rich is a first order failure not idle controls.
idle is the last thing , to work after all else is ok, see?
IN modern car we go, gee the fuel trim goes nuts (lean) as then engine surges slower, oops that is fix first thing, on OBD2 cars, not surge.
if you worked on carb cars it did this all the time , no idle controls then. zero. no puters, nada. just pure mechanics then.
so if carb fuel mixtures are wrong so will be idle speeds. RPM.
if AFR is normal, air leaks now , cause lower rpm (normal = lean = less power and lower rpm) and surges. lean burn = surge.
if AFR is rich (choke on?) and air leaks now, the engine screams, and no surge. and a danger to drive (teens? driving? )
the same rules apply here.
the AFR if wrong , can cause surge. or gross rich misfire, that is not really a surge, its just misfiring, heard and felt. and even seen.
now demo of bad
all 8v TBI cars 89-95
defeat the dash pot by pulling its vacuum hose, (even plug the end with golf tee (no can suck air)
NOW see the silly suzuki ECU surge the hell out of the isc, (illegal that is now)
and is a danger. to many, not me grand-dad say , "son you can turn the key off or go to neutral in 1 second flat, learn that son"
or any large vacuum lean, and omg, it surges like a PIG with 100% power on tap . shift to drive and it burns rubber.. on ice, oops worse.
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