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16 valve TPS Question
01-12-2018, 03:55 AM
Post: #11
RE: 16 valve TPS Question
your mod valve cap , number end in 60b00?
60b00 means for Suzuki G16 engines and not toy.

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01-12-2018, 03:55 AM
Post: #12
RE: 16 valve TPS Question
covering more bases here.

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01-12-2018, 03:56 AM
Post: #13
RE: 16 valve TPS Question
we will find it, !!!!

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02-08-2018, 08:40 AM
Post: #14
RE: 16 valve TPS Question
The live test on the EGR is good(I did have to lift a wheel though). It is still running rough at idle and low throttle input. It seems to run fine above 2500-3000 RPM, especially when under acceleration. But if I attempt to accelerate from lower RPM(2,500 RPM and lower) it stumbles and then cleans up after 3,000 RPM, then runs strong. I unplugged the O2 sensor and it didn’t change. Also, I have to push the gas pedal to get it to start in the morning, which I know is a sign of a problem on an injected car.

1986 Samurai with 1993 1.6 16V
1.6 completely rebuilt, Trail Tough harness modification and ECM bench test, injectors tested and cleaned, Thorley header, new cat, 2”exhaust
Trail Tough Epic Trek SPOA on 33” BFG KO2’s
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02-08-2018, 09:06 AM
Post: #15
RE: 16 valve TPS Question
ok, High NOX.
engine misfire hot at idle? not good.
the pushing gas pedal in A.M start ups means its staving for air.
the IAC is not open. is my guess. for cold starts. In fact the ECu assumes it is open and injects cranked based on the modeling of IAC open.
or its over injecting (ECT reads wrong (too high ohms) and overfuels and you need even more air to start engine.

so is fuel pressure at spec.? at ide and at WOT , (gunned pressure increases about 6 PSI from idle.)
Make sure the MAF is clean (from 8' afar clean it with cleaner spray)
injectors not leaking,

oddly....
nox happens the most the better the combustion, nox is by product of too much heat (and max power) in the combustion chamber, all normal and is why they inject EGR gasses to cool it down a bit the the remainder is via the 3 way CAT removing the NOX last.
but if car misfires, nox is less. (so must be only some conditions NOX happens, speeds and load,)
so there are 2 problem so solve.
it seems

I can assume tuned up, spark ,wires ,cap rotor and fuel &air filter, less that say 30k ago.
Id check fuel pressure first if not already done.
The FPR on this car is too old now if original.

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02-08-2018, 10:23 AM (This post was last modified: 02-08-2018 04:21 PM by Oscar.)
Post: #16
RE: 16 valve TPS Question
Yeah, it will stumble coming off idle, when it’s just idling with no throttle input it doesn’t misfire. It idles up to 1200 rpm when cold and then comes down to 800 when warm...all good. Could be that it’s over injecting like you mentioned...ECT ohms? I’ll check
Might be why it only does it until I get the butterfly open and start adding lots of air. Fuel pressure is spec, maf clean, fpr testing perfect. Brand new tune up with rebuild, less than 1 K miles. And the numbers on the egr mod valve are 60b00(in response to your previous post...took me a minute to see we moved on to page 2, lol)
Thanks for all the help!

1986 Samurai with 1993 1.6 16V
1.6 completely rebuilt, Trail Tough harness modification and ECM bench test, injectors tested and cleaned, Thorley header, new cat, 2”exhaust
Trail Tough Epic Trek SPOA on 33” BFG KO2’s
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02-12-2018, 10:18 AM
Post: #17
RE: 16 valve TPS Question
the ect must be like 300 ohms hot, 180f, is that,
pull connector hot read sensor with any ohm/dmm meter made

the TPS must work , this signals the ECU that you tipped in the throttle fast and prevents TIp in bog.
the the MAF wakes up (air flow is slow and delayed) and the ECU goes to enrich mode at tip in via TPS early warnings.
also if the idle switch opens late the ecu does not see the tip-in until too late and bogs (hesitates)

this stumble is this hot or cold engine or both?

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02-12-2018, 10:46 AM
Post: #18
RE: 16 valve TPS Question
It does it hot and cold. ECT checks good. I’ll recalibrate the TPS just to be sure. Would that explain the cold start issue where I have to pump the accelerator pedal? Thanks again for your help!

1986 Samurai with 1993 1.6 16V
1.6 completely rebuilt, Trail Tough harness modification and ECM bench test, injectors tested and cleaned, Thorley header, new cat, 2”exhaust
Trail Tough Epic Trek SPOA on 33” BFG KO2’s
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02-12-2018, 09:23 PM
Post: #19
RE: 16 valve TPS Question
cold start and hot are 2 different things

the ECT is next.
it must read correctly
the ECT sets the fueling rate, cold. it must read correctly for cold then 300 ohms hot.
the yellow back ground is spec. for ECT (suzuki)
the IAC sets air flow, cold cranked, and the at cold idle.
the ECT sets the fuel rates cold adding fuel to the known rates of air above. cold.
when the ECT report coolant is over 150f, the ECU switches to hot running mode. and the IAC is 100% closed now,. hot.

http://www.fixkick.com/ECU/temp-sensors.html

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