My q45 has lost power, engine Rumbles/Sputter

[rfranco1984]

Ok. I drive a 1995 infiniti q45 last month all of the sudden the engine began to rumble/sputter when at idle & driving. It has also lost total pickup power. Its very slow to accelerate, i mean very slow, not the normal! I replaced the all 8 fuel injectors, and put in 8 new spark plugs. I don't know what else it can be. Its starts I can drive it but there is no real power. plz help what am I over looking?

[Infinitiguy19]

Well since you spelled Infiniti correctly I would say check the fuel pressure with a inline gauge and make sure that its 34 PSI at idle and 43 PSI when you blip the throttle.

If the above is not meant then replace the Fuel Pump and check the Fuel Pump Control Unit for any signs of burns, basically make sure that it looks okay.

[rfranco1984]

Thank something I didnt think about. Thanks I was also told to check out various sensors, Knock sensors and the MFI. I think its call MFI well I will do all this tomorrow see whats up Sunday will get back to you Thanks again!

[goody90q45]

Is the check engine light (CEL) on? If not you've got to suspect the fuel pump or fuel pump control unit (FPCU). Tell us more.

[lino]

Thank something I didnt think about. Thanks I was also told to check out various sensors, Knock sensors and the MFI. I think its call MFI well I will do all this tomorrow see whats up Sunday will get back to you Thanks again!

MAF (Mass Air Flow Meter)

I had to replace my MAF because of similar issues to what you're describing. My fuel pump also failed and that also caused similar knd of issues too.