Technical 1.2 8v injectors spray for 2 sec and stop

[Nompha]

I have fiat punto 1.2 8v 2010 dont know what the problem car has spark and fuel pressure by rail . But on injectors it spray for 2 sec while cranking and stop until you switch off ignition and on again it sprays 2 sec and stop. Changed them and fuel pump nothing changed car runs if u put petrol on intake . Changed ecu still is the same please help dont know what to do

 

[GrandePunto PL]

What's the history (is it recent purchase or what)?
What else was done to "diagnose" the car? Diagnose, not just swapping parts (this is NOT how you fix the cars in the 21st Century).
OBD2 parameters (FES or MES sofware)? Temperatures, pressures (MAP)?
Real diagnostics like oscilloscope (starting with crank TDC sensor waveform)?
Example waveforms: https://rotkee.com/en/waveform-library?brand=169

The Best YT channel so far: https://www.youtube.com/c/AutomotiveTestSolutions/videos Real Diagnostics!

My bets are:
- something wrong with the timing belt,
- maybe fuel delivery (just measure the pressure),
- sensors (crankshaft), MAP,
- ignition,
- ECU failure.

 

[g8rpi]

Sounds like fuel pump relay or fuse. Most car bypass this during cranking to compensate for voltage drop so it works when you crank.
Haven't checked the GP schematics.
You have checked the fuel cut-off inertia "crash" switch?

Fuel cut-off switch (FIS) :: Controls :: Dashboard and controls :: Fiat Punto Owner's Manual :: Fiat Punto - Fiat Manuals

Very quick fix, just push the rubber top down.

Other that thatbBest thing is to buy MultiECUscan www.multiecuscan.com and a ELM327 interface. This will allow you ro read codes and pressures and also turn the pump on manually.

Robert.

 

[Nompha]

Sounds like fuel pump relay or fuse. Most car bypass this during cranking to compensate for voltage drop so it works when you crank.
Haven't checked the GP schematics.
You have checked the fuel cut-off inertia "crash" switch?

Fuel cut-off switch (FIS) :: Controls :: Dashboard and controls :: Fiat Punto Owner's Manual :: Fiat Punto - Fiat Manuals

Very quick fix, just push the rubber top down.

Other that thatbBest thing is to buy MultiECUscan www.multiecuscan.com and a ELM327 interface. This will allow you ro read codes and pressures and also turn the pump on manually.

Robert.

I will try to check the switch and see what is doing ....

 

[Nompha]

What's the history (is it recent purchase or what)?
What else was done to "diagnose" the car? Diagnose, not just swapping parts (this is NOT how you fix the cars in the 21st Century).
OBD2 parameters (FES or MES sofware)? Temperatures, pressures (MAP)?
Real diagnostics like oscilloscope (starting with crank TDC sensor waveform)?
Example waveforms: https://rotkee.com/en/waveform-library?brand=169

The Best YT channel so far: https://www.youtube.com/c/AutomotiveTestSolutions/videos Real Diagnostics!

My bets are:
- something wrong with the timing belt,
- maybe fuel delivery (just measure the pressure),
- sensors (crankshaft), MAP,
- ignition,
- ECU failure.

I recently changed the lockset. Is doing the same car has spark and compression even fat compression from pump to rail . But wen u crank it sprays injectors and seems like dropping pressure on injectors they spray small amount of fuel . And car is running fine if you put gas on intake

 

[Nompha]

I have fiat punto 1.2 8v 2010 dont know what the problem car has spark and fuel pressure by rail . But on injectors it spray for 2 sec while cranking and stop until you switch off ignition and on again it sprays 2 sec and stop. Changed them and fuel pump nothing changed car runs if u put petrol on intake . Changed ecu still is the same please help dont know what to do see the vid on link its doing the exactly problem

 

[Nompha]

What's the history (is it recent purchase or what)?
What else was done to "diagnose" the car? Diagnose, not just swapping parts (this is NOT how you fix the cars in the 21st Century).
OBD2 parameters (FES or MES sofware)? Temperatures, pressures (MAP)?
Real diagnostics like oscilloscope (starting with crank TDC sensor waveform)?
Example waveforms: https://rotkee.com/en/waveform-library?brand=169

The Best YT channel so far: https://www.youtube.com/c/AutomotiveTestSolutions/videos Real Diagnostics!

My bets are:
- something wrong with the timing belt,
- maybe fuel delivery (just measure the pressure),
- sensors (crankshaft), MAP,
- ignition,
- ECU failure.

Please click the link its doing exactly on video

 

[GrandePunto PL]

Do some real diagnostics, not swapping random parts!

Does it cut pump or injectors or both?

What's the history of the car? What was done recently? Timing belt job maybe?

 

[Nompha]

It cuts injectors only .not pump nothing was done it just stated and thought myb is ecu changed it still is the samething

 

[Nompha]

Please see the vid below