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#1
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4.8is Cranks over but engine won't start
Any ideas what to diagnose using process of elimination?
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Current: 2017 640Xi Convertible 2011 Acura MDX 2018 Santa Fe Past: 2013 Honda Accord 2008 Acura TL Tech.------2004 BMW X5 4.8is----2004 Acura MDX Tech 1994 BMW 525i.----------1994 Lexus 300 GS.----1994 Acura Legend GS 1991 Acura Legend LS.----1991 Honda Accord.----1991 300ZX twin turbo 1996 Buick Regal GS.-----1984 300Z 50th anniv.--2002 BMW X5 1982 280Z Last edited by X5Ghost; 09-23-2015 at 06:02 PM. |
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#2
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Perhaps the fuel pump?
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#3
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Off the top of my head things to check are,
Fuel pump, key battery/ews, ignition switch, plugged fuel filter, DME module. And the relays/fuses for them as well.
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2006 X5 4.8is Fully Loaded |
#4
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Key battery/ews would be my first checks. Scan with a good reader and it will tell you if you have ews faults. That's how I diagnosed my wife's e83 long crank/no start issues... dying battery in the key.
Then fuel pump. Then maybe ignition switch.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#5
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Even if the key fob operates the doors, alarm, and everything else fine, it could still be key batt? or would good key operation rule this out?
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Current: 2017 640Xi Convertible 2011 Acura MDX 2018 Santa Fe Past: 2013 Honda Accord 2008 Acura TL Tech.------2004 BMW X5 4.8is----2004 Acura MDX Tech 1994 BMW 525i.----------1994 Lexus 300 GS.----1994 Acura Legend GS 1991 Acura Legend LS.----1991 Honda Accord.----1991 300ZX twin turbo 1996 Buick Regal GS.-----1984 300Z 50th anniv.--2002 BMW X5 1982 280Z |
#6
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Yep, other key operations could be fine but EWS ring might not be getting enough signal from it. That's what was so puzzling about the X3's no start. Took a scan with Carly BMW app to get an EWS error that made it make sense.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#7
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Quote:
The fact that the engine is cranking is proof that it is not a EWS issue. More likely a dead fuel pump. You can have some one listen with the gas cap off while you do a key on and key off to see if they can hear the fuel pump priming the lines, or you can connect a fuel pressure gauge to the fuel rail and see if ypou have any pressure at the fuel rail. Last resort will be to give it a shot of starting fluid to see if the engine fire. If the engine fire you have a fuel delivery issue. Could also be a no spark issue. You can pull one of the coil and insert a new spark plug into the coil and observe if there's a spark. No spark mean you could have a bad CPS (crank position sensor).
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#8
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The battery in the key fob has nothing to do with the EWS. The engine cranks so you don't have a EWS issue.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#9
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there's a crank sensor that tells the car the motor is turning. if it's failed the car wont start. probably the problem. i forget what its called but its a little sensor. i replaced on my first X, and just on my brothers Jeep. no code thrown on either car.
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focus!
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#10
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Quote:
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
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