Kamal thapa
New member
hello senior members my fiat punto pure 1.2 8v 2016 model shows very low desired idle rpm
Technical desired rpm is very low
- Thread starter Kamal thapa
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Technical desired rpm is very low
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Engine is OFF. Come on.
What's your problem?Real one (if you have any issues)...
Maybe ECU wants you to start the engine (so minimum starter motor speed will be >200-ish RPMs)...that's all.
When engine is not running, most OBD2 data is garbage (besides temperatures and pressures required to start properly, MAP sensor etc.).
ECU disconnected from the car and scanned at home also reports some rubbish "data"...so what? Nothing.
PS
Which version of the car you own? I mean, what market, continent? European or "India" or something else (Russia, China, South Africa/America)?
Year 2016 should be "CF5" (Euro5 emissions, not 4) in civilized countries. Select right ECU (and engine: 1,2 or 1,4) in the MES program.
Is this a stock car of modified/repaired using random parts? So "2012" model/lift got ECU from Grande era? What's going on here(?).
Last edited:
Kamal thapa
New member
View attachment 460564
Engine is OFF. Come on.
Real one (if you have any issues)...
Maybe ECU wants you to start the engine (so minimum starter motor speed will be >200-ish RPMs)...that's all.
When engine is not running, most OBD2 data is garbage (besides temperatures and pressures required to start properly, MAP sensor etc.).
ECU disconnected from the car and scanned at home also reports some rubbish "data"...so what? Nothing.
PS
Which version of the car you own? I mean, what market, continent? European or "India" or something else (Russia, China, South Africa/America)?
Year 2016 should be "CF5" (Euro5 emissions, not 4) in civilized countries. Select right ECU (and engine: 1,2 or 1,4) in the MES program.
View attachment 460565
Is this a stock car of modified/repaired using random parts? So "2012" model/lift got ECU from Grande era? What's going on here(?)
View attachment 460564
Engine is OFF. Come on.
Real one (if you have any issues)...
Maybe ECU wants you to start the engine (so minimum starter motor speed will be >200-ish RPMs)...that's all.
When engine is not running, most OBD2 data is garbage (besides temperatures and pressures required to start properly, MAP sensor etc.).
ECU disconnected from the car and scanned at home also reports some rubbish "data"...so what? Nothing.
PS
Which version of the car you own? I mean, what market, continent? European or "India" or something else (Russia, China, South Africa/America)?
Year 2016 should be "CF5" (Euro5 emissions, not 4) in civilized countries. Select right ECU (and engine: 1,2 or 1,4) in the MES program.
View attachment 460565
Is this a stock car of modified/repaired using random parts? So "2012" model/lift got ECU from Grande era? What's going on here(?)
Kamal thapa
New member
Sorry sir.i purchased second hand car.iam from nepal here all fiat cars are made in india.i am also confused why my 1.2 shows 1.4 8v
.problem with my car is in morning its never starts in one key.no matter how many times i prime motor.in first start it stall in 2-4 second.but goes perfectly in second round.sometimes car don't sart without bleep acc pedal.i changed throttle body map sensor and fuel pump but problem still the same
.problem with my car is in morning its never starts in one key.no matter how many times i prime motor.in first start it stall in 2-4 second.but goes perfectly in second round.sometimes car don't sart without bleep acc pedal.i changed throttle body map sensor and fuel pump but problem still the same
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Car needs a real Diagnostics, not parts swapping anymore (universal "method" all across the globe as we can see - wrong method).
https://www.youtube.com/@AutomotiveTestSolutions/videos
https://www.youtube.com/@ScannerDanner/videos
https://www.youtube.com/@PineHollowAutoDiagnostics/videos
https://www.youtube.com/@MechanicMindset/videos
https://www.youtube.com/@SchrodingersBox/videos
https://www.youtube.com/@realfixesrealfast/videos
General advice, solutions, ideas: https://www.google.com/search?q=car+starts+and+immediately+dies
PS
Show us all parameters from MES while engine is running.
Plus, OBD2 is for data logs, not just error codes and watching numbers jumping.
https://www.youtube.com/@AutomotiveTestSolutions/videos
https://www.youtube.com/@ScannerDanner/videos
https://www.youtube.com/@PineHollowAutoDiagnostics/videos
https://www.youtube.com/@MechanicMindset/videos
https://www.youtube.com/@SchrodingersBox/videos
https://www.youtube.com/@realfixesrealfast/videos
General advice, solutions, ideas: https://www.google.com/search?q=car+starts+and+immediately+dies
PS
Show us all parameters from MES while engine is running.
Plus, OBD2 is for data logs, not just error codes and watching numbers jumping.
Last edited:
Kamal thapa
New member
- Joined
- Apr 22, 2018
- Messages
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- Points
- 295
I'm not a "Sir".
Unfortunately data above was taken while engine was still heating up. So some parameters will be off (not perfect).
You car is not for Europe, so strict emissions don't apply there. Engine tuning/setup may differ. Redo the test while engine is fully hot.
Some parameters are wrong (unless you are very high in the mountains). Where is the car now (altitude, how high above the sea level)?
0. Spark advance and injection time is a bit off (spark is like a hot engine, injection is high like in cold engine). Timing also affects those.
1. Calculated oil temperature is way different than air and coolant temperature. Coolant and oil temp. should be similar values. Check the coolant temperature sensor in the thermostat body.
2. Intake pressure and Air pressure are "too low" (vacuum not strong enough). MAP sensor is to be checked again (and the wiring)!
There are two sensors (MAP is bigger and it's NOT visible on the picture below, it's an ambient air sensor). Which one you swapped?
3. Engine is not hot enough yet, but already lambda integrator is way above 1,0 (should be the opposite I guess, cold = too rich on purpose).
4. Do you have VVT in your unit? If it is present, VVT wheel and/or solenoid valve may be dirty (so you get small shift -0,69 VS -2,0 deg.).
5. Desired idle RPM (257 rpm) is a rubbish data (so I guess there is no VVT?). Absurd number. Nonsense. Or a software bug (MES is not perfect).
6. If you have VVT, the timing is a bit wrong (100,44 degrees VVT1 position - should be about 106,00 deg. - but again, for Euro exhaust standards). For "India", I don't know (different tuning?). Timing influences intake vacuum (so MAP sensor can be OK).
Real data logging is done here, "F5 Graph" tab. You grab data to the CSV file (then you can process it in the "Excel" for example).
Then you can make graphs, plots like this (for example VVT operation in European 1,4 8V Grande). Test drive, you record data for a few minutes.
On the side note, remember all 8V units have valve shims to adjust lash periodically (or at least to be checked once in the life of the car).
Guide and Discussion: https://www.fiatforum.com/guides/valve-clearance-check-and-adjustment-1-4-8v.824/
Your car is all over the place a bit. It can be anything: bad sensors (pressure/temperature, gas pedal), bad valve "lash", intake air leak, bad timing.
Mind the very basics too (like a bad "earth/ground")...https://www.fiatforum.com/grande-punto/318839-electrical-gremlin-thread.html
PS
If your MES is not original, it can report bad data (as a revenge on software pirates). Try using way older MES or even FES.
Unfortunately data above was taken while engine was still heating up. So some parameters will be off (not perfect).
You car is not for Europe, so strict emissions don't apply there. Engine tuning/setup may differ. Redo the test while engine is fully hot.
Some parameters are wrong (unless you are very high in the mountains). Where is the car now (altitude, how high above the sea level)?
0. Spark advance and injection time is a bit off (spark is like a hot engine, injection is high like in cold engine). Timing also affects those.
1. Calculated oil temperature is way different than air and coolant temperature. Coolant and oil temp. should be similar values. Check the coolant temperature sensor in the thermostat body.
2. Intake pressure and Air pressure are "too low" (vacuum not strong enough). MAP sensor is to be checked again (and the wiring)!
There are two sensors (MAP is bigger and it's NOT visible on the picture below, it's an ambient air sensor). Which one you swapped?
3. Engine is not hot enough yet, but already lambda integrator is way above 1,0 (should be the opposite I guess, cold = too rich on purpose).
4. Do you have VVT in your unit? If it is present, VVT wheel and/or solenoid valve may be dirty (so you get small shift -0,69 VS -2,0 deg.).
5. Desired idle RPM (257 rpm) is a rubbish data (so I guess there is no VVT?). Absurd number. Nonsense. Or a software bug (MES is not perfect).
6. If you have VVT, the timing is a bit wrong (100,44 degrees VVT1 position - should be about 106,00 deg. - but again, for Euro exhaust standards). For "India", I don't know (different tuning?). Timing influences intake vacuum (so MAP sensor can be OK).
Real data logging is done here, "F5 Graph" tab. You grab data to the CSV file (then you can process it in the "Excel" for example).
Then you can make graphs, plots like this (for example VVT operation in European 1,4 8V Grande). Test drive, you record data for a few minutes.
On the side note, remember all 8V units have valve shims to adjust lash periodically (or at least to be checked once in the life of the car).
Guide and Discussion: https://www.fiatforum.com/guides/valve-clearance-check-and-adjustment-1-4-8v.824/
Your car is all over the place a bit. It can be anything: bad sensors (pressure/temperature, gas pedal), bad valve "lash", intake air leak, bad timing.
Mind the very basics too (like a bad "earth/ground")...https://www.fiatforum.com/grande-punto/318839-electrical-gremlin-thread.html
PS
If your MES is not original, it can report bad data (as a revenge on software pirates). Try using way older MES or even FES.
Last edited:
