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7 Series - E38 (1995 - 2001)

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  #1  
Old 01-31-2013, 03:47 AM
prkst000 prkst000 is offline
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Location: Houston
 
Join Date: Oct 2008
Posts: 33
Mein Auto: 750IL
Smile Need help with E38 startup

Folks, I have a 98 BMW 740il. It will start up but shuts down in about 15-20 seconds. My guess is either the fuel pump or the crank shaft position sensor. I have not done any troubleshooting yet. I would appreciate any guidance to get started.
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  #2  
Old 01-31-2013, 05:19 AM
chrisn7 chrisn7 is offline
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Location: Huddersfield, West Yorks
 
Join Date: Oct 2011
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Mein Auto: 750iL
Some fuel must be reaching the engine for it to start. Could be fuel starvation, so I would look to the fuel filter first, as this will the cheapest and quickest item to replace. The filters are dated and you may well find the original factory fit still there.
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  #3  
Old 01-31-2013, 08:20 AM
Espresso Espresso is offline
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Location: Panama City, Panama
 
Join Date: Oct 2005
Posts: 131
Mein Auto: 2001 740i Sport
Did this start happening out of the blue or did it progressively get worse? Any work done to it in the last few months? Does the CEL come on...... Does the bulb even work?
Does it start right away or does it take 2-3 times?
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  #4  
Old 01-31-2013, 07:40 PM
prkst000 prkst000 is offline
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Location: Houston
 
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Cool E38 startup issues

I thought about fuel filter also right after my post. That is a good idea. I will check it out tomorrow and feedback. Thank you.

As when it started happenning, It started happening a few months back but the car has been sitting for a couple of months since last time it did not start. Thanks for the feedback to both of you.
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  #5  
Old 02-03-2013, 07:12 AM
Cosmopat Cosmopat is offline
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Location: Under the hood
 
Join Date: Jan 2013
Posts: 12
Mein Auto: 2000 740i m-sport
Maf?

Unplug your mass airflow sensor an see if it still does the same thing. When my maf went it did the same thing, unplugged it and it ran like a champ. Bought a new maf and kept on rolling!
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  #6  
Old 02-03-2013, 07:23 PM
Johnny Montana Johnny Montana is offline
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Location: Blaine, Washington
 
Join Date: May 2010
Posts: 51
Mein Auto: Lotsa 7 series! E38 Fan!
Maf is your problem. Easy to test. Easy to replace. Common problem. Be smart and buy a good Bosch Maf ($250 ish)

I've had the exact issue/symptoms with two of my cars in the last few years.....failing Maf.

JH
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  #7  
Old 02-09-2013, 02:24 PM
prkst000 prkst000 is offline
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Location: Houston
 
Join Date: Oct 2008
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Mein Auto: 750IL
All, thanks for all of you who replied. I found the problem and here is how i did it:

1 - First I checked the voltage coming to the Fuel pump which was perfect.
2 - Then I checked fuel pressure at the pump and it was perfect 70+ PSI.
3 - Then I checked fuel pressure out from Fuel filter and that was also perfect. This would have shown me if the Fuel filter is clogged up to cause gas starvation. Not the case here.
4 - I had ordered Fuel Pump, Crakshaft position sensor and spark plugs. So I went ahead and replaced the Cranksahft position sensor at this point.
5 - Now engine ran more cycles to the point that registered a fail code 340, asking for Camshaft position sensor baknk 1, single curcut. This was much much better because prior to this it did not even throw a code. Engine shut off without going to a few complete cycles.
6 - Bought a Camshaft position sensor from XL parts. I have account with them so it only cost my $104 plus Tax. Returend the Fuel pump and exchanged to for CPS. Fuel pump would have been at least $155. Not just the canister, the entire assembly without the level sensor. Repalced the Campshat position sensor in 5-10 minutes.
7 - The engine started right up and stayed on. However it ran a little sputtery and showed mis-fire in cylinders 1 and 3.
8 - Replaced the spark plugs and runs better but still throws codes 300 and 303 complaining on mis-fire at Cyl 1 and 3. I can drive the car now. It also needs right front lower control arm.

One of the plugs shows real clean so I am thinking the coil or injector is bad. Or it could be dead, not sure yet. The other one I am not sure. I have not done compression test of the pistons yet. That's my next thing to do.

I need to know which one is cylinder 1 and 3 now. Can anybody show me where I can get the diagram for the cylinder positons?

Thanks guys. So far so good. I feel like I have accomplished something. Going from no start to start and continous running with about $220 worth of parts so far. I would not have been able to get this far without you'all's help.

Last edited by prkst000; 02-09-2013 at 08:19 PM.
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  #8  
Old 02-10-2013, 10:22 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
1 is front left facing the engine; then count backwards until you run out of cylinders, start next number right front, work backwards.
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  #9  
Old 02-11-2013, 07:03 PM
prkst000 prkst000 is offline
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Location: Houston
 
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Mein Auto: 750IL
Smile 740IL Mis-Fire issues

Got it thanks. And I also found the misfire issues. It had to do with two bad ignition coils on Cylinder 1 and 3. When I moved around the ignition coils, the mis-firing followed the movement. I moved two coils from my 528i since they both use the same coils, then the misfire issue got resolved.

Now that the engine is running without misfire code, after about 20 miles I am getting 3 fault codes:

173, 505 and 130. I know one has to do with idle control valve. This car has been sitting for a few months so chances are that other things need to be maintained. I am going to clear these codes and drive it again to see if they will pop up again.

In the mean time if you all have any ideas going after these codes then please fell free to take a shot at them. Thanks.
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  #10  
Old 02-11-2013, 08:57 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
Clean all the inlet tract out very carefully. Special attention to ICV etc.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #11  
Old 02-13-2013, 02:50 AM
prkst000 prkst000 is offline
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Location: Houston
 
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Mein Auto: 750IL
Replaced the mass air flow boot O ring where the boot connect to the throttle body and code 505 went away. I now get p0173, p0170 and p0130 consistently. Some threads say the first two has to do with O2 sensors and some say cleaning the MAF should fix 173 and 170 codes. I am doing more readings to see what can be done. Any ideas you all have out there is greatly appreciated.
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  #12  
Old 02-15-2013, 01:15 PM
prkst000 prkst000 is offline
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Location: Houston
 
Join Date: Oct 2008
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Mein Auto: 750IL
Smile Need help with P0173 code now

All, I am now getting only one error code and that is P0173. All the other error codes went away by replacing the MAF boot O ring. The engine is not smooth idling and it's shaking a bit but it does not shut down. I can drive it as is and the CEL comes on in about 20-25 miles and throws P0173. My scanner says O2 senser bank 2 but I am not sure because of the Idling condition. Please help.
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