05-03-2017, 10:57 PM
Virtual Signature: 1994 Sidekick 16v G16b 4 MPI injectors (in a Samurai body car) my guess 5 speed. FrankenSammi.
is the check engine lamp on key ?
is the check engine lamp off running
is the Check engine lamp flashing code 12 , idling , and driving? (DLC diagnostic jumper inserted)??????????? this is first. and not stated yet.+
Low RPM
Low , are you parked, sure, are you in gear, ? Automatic trans, ? or is this a Stick shift car, ive now idea what you have or swapped in to that sammi.
what is there now, fully, 2door 4wd, with what exact drive train, (transmission?)
is this with or with out the Sidekick harnesses for engine, and speedo cluster, dash harness sets ????
Is this car using the 95sidekick ECU?
keep in mind my my answers may be different for stock 95 Sidekick than any Samurai.
Btw, the EGR is turned off at idle and WOT. By ECU command. so it can not effect WOT ever, unless its sticks open.
if the EGR main is closed at idle, then it can NOT be ECU caused, simple tests show that. (hand testing EGR main)
what can low idle be (basics) ? its only 2, answers
1: The ECU can not control idle. (huge list of causes)
2: The engine is running super lean, at idle.
If we had a scan tool we'd see that #2 is false,but you dont have that. so must guess. (or add propane gas to the air intake, and see if it speeds up)
so what causes #1.
Gross misfiring, heard, seen or felt.
super rich fuel mixture, causing misfire.
ISC dead. (for many reasons, but dead, it is idle controls are now Dead.)
idle switch not closed, cause ISC to be off line. dead.
injectors leaking, or clogged, causing misfire. and lower rpm, all misfire can and will cause too low RPM if the ISC can not , correct it.
air leaks, all air leaks can cause lean AFR, air fuel ratio mix to go lean, all air leaks bypass the MAF and so that makes the MAF reading low. causing lean.
stated above as #2 cause.
Air leaks are complex on MPI, any leak or many leaks from the intake valves to the back side of the MAF are all illegal leaks.
and illegal leak is called Unmetered air flow, air not measured by the MAF, and not corrected by the O2 sensors.
keep in mind we are working with no scan tools here.
so must work blind or use meters and scopes to find what is failing, guessing can be hard, lacking no evidence at all but (too low idle)
is the ISC clean. (I remove it,(leave hoses connected so water dont leak) then clean it, then test it with a 12vdc battery, (it uses 1amp current) and is seen to do this , and heard in this first video.... if this fails, the ISC is dead.
http://www.fixkick.com/videos/FLV-all/showtime.html#ISC
it really is not tough one, its just testing engines with no scan tool is super labor intensive, (the whole reason we invented OBD is to avoid that)
are the spark tips running white or jet black? that is a test too.
does the propane tests show engine is lean?
at idle what is the MAF output voltage.?
does it idle at 800 HOT with the o2 sensor unplugged?
does the ECT read near 300 ohms unplugged, hot?
I do have a whole list of tests. to find out if its lean cause, too rich caused, or ISC dead. and more.
each test is a manual test using hands, tools and meters, to find out that all sensors are working
to discover if the engine is running lean or rich, and to see if there are air leaks.
is only one , spark plug black (tips) and injector might be leaking
is fuel pressure at spec? if at 55psi all 4 will over inject and go rich and misfire and idle controls cant correct RPm to 800. so fails.
see how important it is to know what AFR is doing at IDLE? rich or lean?
one other cause , sure
the front 02 sensors, if you have any exhaust leaks NEAR there, the 02 sensor slams 0volts, and the AFR goes super rich, before 1996, its worse.
this causes sparks to go black, engine misfires and idle fails. (low)
to learn all this, one must do tests, (no scan tools, lots and lots of tests) this is called collecting evidence.
the evidence at hand, tells the tech what direction to go and the next set of test.
case in points:
1: too rich we do too rich tests.
2; too lean we do too lean test.
3: isc dead, only, we do more tests related to ISC,
A scan tool tells use all 3 in 5minutes flat. and more, lots more, it shows the readings of all sensor.
ECT reads wrong
IAT reads wrong
O2 reads wrong
idle speed, wrong, and target speed 800 correct.
idle switch stuck open (wrong)
long term fuel trim set way lean but lean never happens (or the opposite)
closed loop never happens at idle.
basically we do the tests by hand , lacking the scan tool. by hand means (gauges,meters , scope at hand, mechanics have all these tools)
learn to read spark tips.?
when idle fails (stuck low)
1: is engine heard to misfire, see it shake, feel it shake, bingo misfiring.
if you move the throttle, by hand just a tiny bit does idle rise easy, ? or does it fight you.
2: key off engine, pull spark plugs, are they white or black. (oldest engine test on earth over 100 years old. this test ,called reading spark plugs)
3: pull ISC off left side of intake air plenum box, is the valve free, means moves 1/4" easy with say a tooth pick tickling it? clean it yet?
The ISC has to suck in EGR+PCV black cloud of death (nasty mess) and loves to clog. up.
its what i call a gunk cloud, that is a simple clean and test,
The ISC and EGR valve both love to clog on all these G16 engines.
that's it
ive listed most tests, and can expand on each, if you need it.
good luck !
is the check engine lamp on key ?
is the check engine lamp off running
is the Check engine lamp flashing code 12 , idling , and driving? (DLC diagnostic jumper inserted)??????????? this is first. and not stated yet.+
Low RPM
Low , are you parked, sure, are you in gear, ? Automatic trans, ? or is this a Stick shift car, ive now idea what you have or swapped in to that sammi.
what is there now, fully, 2door 4wd, with what exact drive train, (transmission?)
is this with or with out the Sidekick harnesses for engine, and speedo cluster, dash harness sets ????
Is this car using the 95sidekick ECU?
keep in mind my my answers may be different for stock 95 Sidekick than any Samurai.
Btw, the EGR is turned off at idle and WOT. By ECU command. so it can not effect WOT ever, unless its sticks open.
if the EGR main is closed at idle, then it can NOT be ECU caused, simple tests show that. (hand testing EGR main)
what can low idle be (basics) ? its only 2, answers
1: The ECU can not control idle. (huge list of causes)
2: The engine is running super lean, at idle.
If we had a scan tool we'd see that #2 is false,but you dont have that. so must guess. (or add propane gas to the air intake, and see if it speeds up)
so what causes #1.
Gross misfiring, heard, seen or felt.
super rich fuel mixture, causing misfire.
ISC dead. (for many reasons, but dead, it is idle controls are now Dead.)
idle switch not closed, cause ISC to be off line. dead.
injectors leaking, or clogged, causing misfire. and lower rpm, all misfire can and will cause too low RPM if the ISC can not , correct it.
air leaks, all air leaks can cause lean AFR, air fuel ratio mix to go lean, all air leaks bypass the MAF and so that makes the MAF reading low. causing lean.
stated above as #2 cause.
Air leaks are complex on MPI, any leak or many leaks from the intake valves to the back side of the MAF are all illegal leaks.
and illegal leak is called Unmetered air flow, air not measured by the MAF, and not corrected by the O2 sensors.
keep in mind we are working with no scan tools here.
so must work blind or use meters and scopes to find what is failing, guessing can be hard, lacking no evidence at all but (too low idle)
is the ISC clean. (I remove it,(leave hoses connected so water dont leak) then clean it, then test it with a 12vdc battery, (it uses 1amp current) and is seen to do this , and heard in this first video.... if this fails, the ISC is dead.
http://www.fixkick.com/videos/FLV-all/showtime.html#ISC
it really is not tough one, its just testing engines with no scan tool is super labor intensive, (the whole reason we invented OBD is to avoid that)
are the spark tips running white or jet black? that is a test too.
does the propane tests show engine is lean?
at idle what is the MAF output voltage.?
does it idle at 800 HOT with the o2 sensor unplugged?
does the ECT read near 300 ohms unplugged, hot?
I do have a whole list of tests. to find out if its lean cause, too rich caused, or ISC dead. and more.
each test is a manual test using hands, tools and meters, to find out that all sensors are working
to discover if the engine is running lean or rich, and to see if there are air leaks.
is only one , spark plug black (tips) and injector might be leaking
is fuel pressure at spec? if at 55psi all 4 will over inject and go rich and misfire and idle controls cant correct RPm to 800. so fails.
see how important it is to know what AFR is doing at IDLE? rich or lean?
one other cause , sure
the front 02 sensors, if you have any exhaust leaks NEAR there, the 02 sensor slams 0volts, and the AFR goes super rich, before 1996, its worse.
this causes sparks to go black, engine misfires and idle fails. (low)
to learn all this, one must do tests, (no scan tools, lots and lots of tests) this is called collecting evidence.
the evidence at hand, tells the tech what direction to go and the next set of test.
case in points:
1: too rich we do too rich tests.
2; too lean we do too lean test.
3: isc dead, only, we do more tests related to ISC,
A scan tool tells use all 3 in 5minutes flat. and more, lots more, it shows the readings of all sensor.
ECT reads wrong
IAT reads wrong
O2 reads wrong
idle speed, wrong, and target speed 800 correct.
idle switch stuck open (wrong)
long term fuel trim set way lean but lean never happens (or the opposite)
closed loop never happens at idle.
basically we do the tests by hand , lacking the scan tool. by hand means (gauges,meters , scope at hand, mechanics have all these tools)
learn to read spark tips.?
when idle fails (stuck low)
1: is engine heard to misfire, see it shake, feel it shake, bingo misfiring.
if you move the throttle, by hand just a tiny bit does idle rise easy, ? or does it fight you.
2: key off engine, pull spark plugs, are they white or black. (oldest engine test on earth over 100 years old. this test ,called reading spark plugs)
3: pull ISC off left side of intake air plenum box, is the valve free, means moves 1/4" easy with say a tooth pick tickling it? clean it yet?
The ISC has to suck in EGR+PCV black cloud of death (nasty mess) and loves to clog. up.
its what i call a gunk cloud, that is a simple clean and test,
The ISC and EGR valve both love to clog on all these G16 engines.
that's it
ive listed most tests, and can expand on each, if you need it.
good luck !
http://www.fixkick.com