04-01-2018, 12:01 AM
all hot engine data right>?
why does TPS go to 0 all the time, are you lifting foot off throttle at frame 69 to 72?
OL means open loop,
CL means closed loop, means engine hot, and 02 sensor is swinging and EFI is controlling fuel rates, exactly via O2 readings.
nice set of data.
so when engine stalls, RPM goes to 0 , slow or fast, fast to 0 rpm like dropping rock to the ground is fast, slow means fuel lost. if spark is lost the RPM falls like rock.
NO DTC errors, no P03xx errors, no pending errors, at the stall point push the pending button, key still on, CEL glowing , RPM 0, push the pending button !
you will get this (pending), NO COMS, (means ECU lost power) a DTC error, or no errors, ,no errors implies lost fuel pressure (zero PSI)
The ECU can not see fuel pressures at all , so that means no DTC for that,(low pressure may in fact set a gross DTC error, for longterm fuel trim, )
lets do 2 lines. only and do not look at S2 (s2 = rear cat 02 sensors 2, sensor 2 and is useless data)
only S1 matters for fueling, front sensor.
Speed RPM MAF TPS Sys Load MAP Adv STFT B1 LTFT B1 B1S1 B1S1( B1S2 STFT B1S2)
75 us frame (scanned frame # sequential)
8 is MPH.
1962 is RPM
2.25 is MAF air flow, gram/minute>? (we must scan it only and fast to see if it died, on the fly, fast scanned , at stall) timing here (testing) is key.
20.4 is TPS throttle angle 20% ;right foot throttle.
CL= closed loop, means steady cruise, right foot steady, normal this is, (CL goes Open OL, at accelerate or deceleration)
25.10% load (engine) this is a calc. based on RPM and MAF.
12: is map sensor, for EGR only, we dont care here.
29.5% is really 29.5 degrees spark advance, very normal all above are.
5.5% is sTFT, ignore this its too fast for humans to see. short term fuel trim.
-3.10 is LTFT and is super normal, longterm fuel trim, it means the fuel is 3% rich(normal for maf errors normal) and the loop removes 3% error, so is minus sign, prefect readings.
0.59 is the O2 voltage, (center of range good, 0v bad, 1v bad) 0.45 is perfect. mix but it changes fast and this is the average .59. and good.
the rest to the right is only for CAT tests. ignore that.
75 8 1962 2.25 20.4 CL 25.10% 12 29.50% 5.50% -3.10% 0.59 1.60% (0.085 99.20%)
The scan toll is slow, as is normal, it can got faster that the PCM can process (it is old and slow) normal
here at frame 76 we see speed rises to 14mph from 8, kinda odd that, are you going down hill? engine stalls and it speeds up? is the clutch pushed to floor now?
76 14 0 0 38 CL 50.60% 26 5.00% 0.8% -3.90% 0.075 6.30%(0.11 99.20%)
here the rpm is 0 and so is MAF
we missed all data from 2.25 maf to zero maf. zero air flow.
what I do is log only mAF, and drive and when it stalls make sure the MAF reads and matches the RPM drop
if the maf falls like a rock, to 0
and rpm (leave transmission in gear at stall and clutch left alone) let the forward momentum of the car, keep RPM higher,
the trans box will spin the engine for your , and keep your foot on the throttle, say 1/2 way, at the stall.
then see if the maf read right,
the MAF works at all times, it measure air flow, even if spark ended, and engine spins, and sucks air like mad, foot on throttle using cars momentum. (5sp car makes this so easy)
if the MAF tracks RPM , map scanned only, then the maf is ok;
if them falls to 0 with RPM way above zero the maf is bad.
if the maf is ok, the fuel pressure is the cause.
or total loss of spark,, please use pendings to see if spark is failing,
keep in mind pendings work, all the time, but DTC will not store , in many cases until 3 driving cycles. so always look in pendings
if if you see any DTC there, use freeze frame, freeze frame shows all sensor data, at the DTC error shown. a key set of facts , on any last occured DTC.
cheers.!
why does TPS go to 0 all the time, are you lifting foot off throttle at frame 69 to 72?
OL means open loop,
CL means closed loop, means engine hot, and 02 sensor is swinging and EFI is controlling fuel rates, exactly via O2 readings.
nice set of data.
so when engine stalls, RPM goes to 0 , slow or fast, fast to 0 rpm like dropping rock to the ground is fast, slow means fuel lost. if spark is lost the RPM falls like rock.
NO DTC errors, no P03xx errors, no pending errors, at the stall point push the pending button, key still on, CEL glowing , RPM 0, push the pending button !
you will get this (pending), NO COMS, (means ECU lost power) a DTC error, or no errors, ,no errors implies lost fuel pressure (zero PSI)
The ECU can not see fuel pressures at all , so that means no DTC for that,(low pressure may in fact set a gross DTC error, for longterm fuel trim, )
lets do 2 lines. only and do not look at S2 (s2 = rear cat 02 sensors 2, sensor 2 and is useless data)
only S1 matters for fueling, front sensor.
Speed RPM MAF TPS Sys Load MAP Adv STFT B1 LTFT B1 B1S1 B1S1( B1S2 STFT B1S2)
75 us frame (scanned frame # sequential)
8 is MPH.
1962 is RPM
2.25 is MAF air flow, gram/minute>? (we must scan it only and fast to see if it died, on the fly, fast scanned , at stall) timing here (testing) is key.
20.4 is TPS throttle angle 20% ;right foot throttle.
CL= closed loop, means steady cruise, right foot steady, normal this is, (CL goes Open OL, at accelerate or deceleration)
25.10% load (engine) this is a calc. based on RPM and MAF.
12: is map sensor, for EGR only, we dont care here.
29.5% is really 29.5 degrees spark advance, very normal all above are.
5.5% is sTFT, ignore this its too fast for humans to see. short term fuel trim.
-3.10 is LTFT and is super normal, longterm fuel trim, it means the fuel is 3% rich(normal for maf errors normal) and the loop removes 3% error, so is minus sign, prefect readings.
0.59 is the O2 voltage, (center of range good, 0v bad, 1v bad) 0.45 is perfect. mix but it changes fast and this is the average .59. and good.
the rest to the right is only for CAT tests. ignore that.
75 8 1962 2.25 20.4 CL 25.10% 12 29.50% 5.50% -3.10% 0.59 1.60% (0.085 99.20%)
The scan toll is slow, as is normal, it can got faster that the PCM can process (it is old and slow) normal
here at frame 76 we see speed rises to 14mph from 8, kinda odd that, are you going down hill? engine stalls and it speeds up? is the clutch pushed to floor now?
76 14 0 0 38 CL 50.60% 26 5.00% 0.8% -3.90% 0.075 6.30%(0.11 99.20%)
here the rpm is 0 and so is MAF
we missed all data from 2.25 maf to zero maf. zero air flow.
what I do is log only mAF, and drive and when it stalls make sure the MAF reads and matches the RPM drop
if the maf falls like a rock, to 0
and rpm (leave transmission in gear at stall and clutch left alone) let the forward momentum of the car, keep RPM higher,
the trans box will spin the engine for your , and keep your foot on the throttle, say 1/2 way, at the stall.
then see if the maf read right,
the MAF works at all times, it measure air flow, even if spark ended, and engine spins, and sucks air like mad, foot on throttle using cars momentum. (5sp car makes this so easy)
if the MAF tracks RPM , map scanned only, then the maf is ok;
if them falls to 0 with RPM way above zero the maf is bad.
if the maf is ok, the fuel pressure is the cause.
or total loss of spark,, please use pendings to see if spark is failing,
keep in mind pendings work, all the time, but DTC will not store , in many cases until 3 driving cycles. so always look in pendings
if if you see any DTC there, use freeze frame, freeze frame shows all sensor data, at the DTC error shown. a key set of facts , on any last occured DTC.
cheers.!
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