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#1
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4.8is intermittant loss of power while accelerating
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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
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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!
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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 |
#3
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I'm going to pick up a pressure tester today. What should the pressure be at the rail?
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2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/ |
#4
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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. |
#5
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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/ |
#6
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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 |
#7
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I'm gonna run the test after dinner.
__________________
2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/ |
#8
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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.
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2004 4.8iS Check out the BMW CCA X Chapter on Facebook - https://www.facebook.com/groups/603822583674050/ |
#9
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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.
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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 |
#10
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Quote:
Or an oil-burner with 26,000psi!!
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
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