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#1
11-18-2020, 02:06 PM
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4.8is intermittant loss of power while accelerating
The 4.8is started doing this yesterday while applying light throttle at stop lights to reach about 45 mph. It's not consistent and does it at odd times. It did it twice yesterday and today it did it while cruising at about 65 on the highway. It's not constant. No CEL. Some folks have mentioned fuel filter, fuel relay and fuel pump. Someone even mentioned the IVM. What are your thoughts?
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2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/ 
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#2
11-18-2020, 03:08 PM
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Always test a few things before you go throwing parts at it.
Fuel pressure testing is QUICK and simple. Test is for VOL and Pressure Take a peek at the coil tops. Burnt? Pull all the codes not just the P codes!
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#3
11-18-2020, 03:29 PM
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Quote:
__________________
2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/
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#4
11-18-2020, 04:54 PM
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50/55 psi
I use this one https://www.amazon.com/OTC-5630-Fuel...ef_=ast_sto_dp REV X E85 Super Tester Reusable Ethanol Testing Kit - 5 oz I also use this as way too many drivability issues are trash fuel. Cheap $12! Background: Had a dealer once play stump "Mr Wizard" by giving me a multiple comeback car with 1/2" pile of service receipts all around poor performance. Scope showed poor cyl to cyl balance under load with multiple cylinders randomly involved. Fuel delivery (Injectors/pump)? Ignition (coils/Plugs)?, Fuel contamination? Pulled a sample of the fuel to show that the car had 33% water/alcohol mix in the tank. Somebody put it in there either at the pump or his neighbor hates him!  Drained the tank, added a can/bottle of injector cleaner, added 1/2 tank of quality fuel. Presto change O, problem gone. I now live by the "test the fuel FIRST" approach for hard to find drivability issues.
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2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 11-18-2020 at 05:21 PM.
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#5
11-18-2020, 05:23 PM
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Many thanks! I'll let you know what I find.
__________________
2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/
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#6
11-18-2020, 06:14 PM
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Bentley Manual says
Idle 36.3-46.4 PSI (system pressure) Engine off 50.76 =/- 2.9 PSI (Residual pressure)
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#7
11-18-2020, 06:22 PM
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Quote:
__________________
2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/
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#8
11-18-2020, 09:28 PM
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The tester I bought sucked. It essentially leaked gas out at the gauge. Everything was tight. It's going back to the store tomorrow. I ordered the one you recommended and it'll be here tomorrow.
__________________
2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/
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#9
11-19-2020, 09:29 AM
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Yep the cheap ones want to see 5-10 psi from a mechanical pump, not 55PSI from a electric pump. Wait until you see the newer cars with 2200 psi direct injected units.
__________________
2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#10
11-19-2020, 03:39 PM
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Quote:
Or an oil-burner with 26,000psi!!  
__________________
Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) 
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