[qp15gts]

Hi Everyone, had a very frustrating experience with my QP and would appreciate some tips for solution!

I have 2015 QP GTS with 50k kms on it.. While driving normally, throttle got unresponsive, no check engine or any kind of warning! Engine shut off and I had to stop on the side.
After turned off ignition and waiting for 5 minutes, it started back again, CEL blinking and I was able to drive in limp mode.

Today I got a full scanner and codes are as below:

-P228D-00 Fuel pressure regulator 1 Exceeded Control Limits - Pressure Too High
-P0300-00 Multiple Cylinder Misfire
-P0302-00 Cylinder 2 Misfire
-P0148-00 Fuel Delivery Error
-P0700-00 Transmission Control System (MIL requested)
*No Freeze frame data

After clearing the errors, car was running without any problems. I only feel some rough run of the engine -intermittent- shaking the car a bit.

Before I had a few times CEL on with P0148-00 Fuel Delivery Error, however didn't feel any problems and continue driving after clearing the code. Already checked all of the relays, fuses, nothing obvious is visible.

Any suggestions on how to proceed and where to focus? I'm avoiding the dealership for now, as we're not on the best terms with them. Car has already undergone with recalls for replacement of fuel lines and fuel pump resistor a few years ago, but I don't trust their workmanship with some reasons.

 

[MaseratiByChance]

Could be loss of adequate fuel pressure, could be a failure with the high pressure mechanical fuel pump. Could be contamination in the fuel system.

 

[qp15gts]

Any recommendation where to start with? I'm sure if I take it to the dealership they'll suggest replacing all low and high pressure pumps + all injectors at least

 

[MaseratiByChance]

Any recommendation where to start with? I'm sure if I take it to the dealership they'll suggest replacing all low and high pressure pumps + all injectors at least

Maserati tech support would recommend replacing the injectors if the high pressure pump failed, from my experience. We don’t know if that’s the case. Start with both low pressure pumps and the fuel relay. If it still runs poorly, another DTC check.

 

[qp15gts]

Relays seems fine, I'll go ahead with replacing low pressure pumps.. Have any suggestions to order pumps at the lowest cost in US? All I see online is some UK websites, quoting for 1200 USD which seems a bit high to me?

 

[ChrisNLBC]

When one of my injectors stuck open it was the same symptoms. I replaced both fuel rails out of caution. As there are some new parts where they made it better.

 

[qp15gts]

Issue is resolved by replacing the low pressure fuel pump only..

For future reference I want to add this information. 2013 and 14 QP GTS is using dual pump, part number is 670003730 and 670003731. From 15 and onwards they use single pump on the left side (670030756) and right side is only level gauge, no pumps inside. 670003731 is also working for 15 and after but there's a siphon hose in the tank going in the bottom of 670030756. Old pump is missing that entrance so I simply left the hose open in the tank.

 

[jeff_half]

Issue is resolved by replacing the low pressure fuel pump only..

For future reference I want to add this information. 2013 and 14 QP GTS is using dual pump, part number is 670003730 and 670003731. From 15 and onwards they use single pump on the left side (670030756) and right side is only level gauge, no pumps inside. 670003731 is also working for 15 and after but there's a siphon hose in the tank going in the bottom of 670030756. Old pump is missing that entrance so I simply left the hose open in the tank.

Experiencing the same right now and was told I need to change both pumps, gaskets and ring nuts... same 3730/3731 along with 1398/1397... did you have to replace gaskets and fastening ring nuts?