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When I try to start my car on a cold start, it has a little trouble. I need to press the gas pedal to have it fire up, but after it has been running it will start up no problem. I think there might be restriction in the fuel system which is causing this, but I haven't run a fuel pressure check yet. I did replace the fuel filter, same problem. I was wondering if it might be the fuel pump? Any suggestions? Its an 04 330ci zhp in case anyone wants to know.
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Could it be bad spark? May try to swap plugs if you haven't done in a while. NGK BKR6EQUP.
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
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replaced the spark plugs, replaced the battery, checked the coils. I don't think it is anything electrical
The worst part is my OBDII reader can't detect anything in the fuel system, or at least I can't figure out how to diagnose it
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I guess it could be fuel pump.....injectors.....?
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
Enforcer
Are you throwing any codes? Without codes, you'll really need to check fuel pressure. Here are some numbers from AllData Pro
Did this selecting a 2003 since I can't read your mind, but should be the same all around for the M54.
Fuel Pressure M54 Engine
Fuel Delivery Pump
Operating Pressure
bar 3.5
Delivery rate >/= 2.25 L / min.
X5 SAV
Typical current consumption
A >7
Passenger Car
Typical current consumption
A <9
NOTES:
RPM Range 620 - 800
Engine at operating temperature.
See: Idle Speed
Injectors and Lines, Fuel Pressure Regulator
Test pressure / nominal value.
bar [ ±0.02 ] = 3.5
Injector Valves, Start Valves
Testing pressure.
bar [ ±0.06 ] = 3.5
Founder of ZHPMafia.com
Nice post ^^
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After almost 1 long year of the car taking a few cranks to start... I FINALLY FOUND THE PROBLEM. It was the darn fuel injectors!!! >2 out of the 6 were leaking. No fuel pressure, so the engine became flooded every time I tried to start it. Finally replaced the leaking injectors and, as they say, the rest is history! I should have taken your advice and checked the injectors a LONG time ago, hah sorry! You guys def. know what you are talking about.
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