Question about 2005 BMW 745i

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Engine code 0x2a6b

Fuel pressure spark cranks over but wont star

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Posted on Jan 02, 2017

SOURCE: Hi I have a 2001 BMW 520i. It wont start. Stopped

Never rule out sensors, based on the fact they sometimes
work or you have spark

You need an oscilloscope and look for milli second
misses and spikes

Use the scope on everything,fuel pump etc

Posted on Feb 11, 2011

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Yesterday i was driving and car died wont start


What is year--make--model? If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs, gasoline engine. If spark everywhere, use a gage and check proper fuel pressure. Check for fuel injector pulse, engine cranking. Check for applicable trouble codes, see if anything shows up.

If the starter motor won't crank, that's a different diagnostic procedure. I need more info.

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firs thing is chek for fuel and spark add some crb cleaner while cranking si ifthe engine attempt to star you may have to address a fuel problem listen for humming noise coming from trunk area when key is turned to run position this indicates if fuel pump is running from here you will need a fuel pressure gauge to hooked and check for the rit fuel presuure 30 psi good luck

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Measure or have a reliable mechanic measure fuel rail pressure. I still say the problem is in the fuel delivery system.

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After getting engine warm in my 98 dakota sometimes it quits and cranks and cranks but wont start


How long since a tune-up? Any applicable trouble codes? Some dodge vehicles you can get mil codes, not sure about your year? It won't hurt to try, turn key just till dash lites come on, no further, cycle the key on--off, on--off, on. Then the mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

Also, when the problem is ongoing have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check fuel pressure. If spark everywhere, use a gage and check fuel pressure, not only check for correct fuel pressure check that the pressure will hold for a bit, with everything off.
Sometimes with idle issues, I check the idle air system.

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1999 Nissan Maxima wont turn over. It cranks, but wont start. It isnt the battery cause its new. My friend said it may be an electrical problem or fuel pump. How can i determine if i am getting a spark? My...


Need three (3) things for an Internal Combustion Engine to run, FUEL, COMPRESSION, & IGNITION. To check spark, pull a plug wire and connect to a spark plug that is sitting on a metal (grounded) surface and crank the engine over. You should see a spark on the plug. If there's no spark present you have narrowed it down to an Ignition Problem, but there's still a mulitude of potential problems that'd cause that. Fuel injected engines do require much more fuel pressue than carb'd engines, so that may need to be checked (external fuel pressure gage) if there is a spark present.

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I was driving and my car died and wont restart. long cranks but wont turn over. I changed the battery still no start.I checked faults codes and got p0340. I changed the cam sensor and code went away. I...


Make sure battery has a full charge. Have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse.

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2 Answers

Car wont start


Hi,
If the engine cranks over normally when you attempt to start you car, but the engine does not start, the problem may be NO FUEL, NO SPARK or NO COMPRESSION. The engine needs adequate fuel pressure, a properly timed spark and normal compression to start.


1) To find why the engine won't start, remove the air inlet tube from the throttle body, push the throttle open and spray a small amount of aerosol starting fluid into the engine. Crank the engine. If it has spark and compression but NO FUEL, it will start and run a few seconds before dying. If it does NOT start, it probably has NO SPARK.

2)Another method to check for spark is to pull a spark plug wire off of a spark plug (if it has plug wires, coil-on-plug ignitions do not) and place the open end of the plug wire near a metal surface on the engine. Have a helper crank the engine while you watch for a spark. DO NOT hold the wire while doing this as it can shock you. If you see a spark, the problem is not spark, but most likely NO FUEL or NO COMPRESSION. If you do not see a spark, the problem is in the IGNITION CIRCUIT.

3)Proper fuel pressure is critical for fuel injected engines to start and run. You should hear the fuel pump inside the fuel tank buzz for a couple of seconds when the ignition is turned on (no buzz means the pump is not running and the engine is not getting fuel). You can smell the tailpipe for gasoline vapors after cranking the engine. If you smell gas, the problem is likely not fuel but NO SPARK. You can also remove the plastic cap and press the schraeder valve test fitting on the fuel rail to see if there is any fuel pressure to the engine (not a very accurate test because fuel pressure must be at a certain level for the engine to start, for that you need a gauge). Even so, no fuel at the fuel rail would tell you fuel is not getting to the engine..


Thank you !!

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Won't star when cranking engine.


check the fuel pressure, could be the fuel pressure regulator. also check fire if the fuel pressure is ok. weak fire could cause this

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1 Answer

My s10 will turn over, but wont squirt gas through injecter


Does it crank? Do you have any codes? Check engine light? Do you have spark? No spark check coil, and connections, also it would be nice to know what year it is. Get codes read. No crank check battery and starter. No codes or lights check crank position sensor, make sure your pcm is good after replacing your ignition mod you could have blown it if you did do it right. (engine computer) Check cam sensor if applies. Crank and cam could prevent it from starting and I know one I think cam controls pcm's fuel delivery on gm's

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