'03 EB with intermittent starting issues
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'03 EB with intermittent starting issues
My wife's '03 EB with 5.4l has recently developed an intermittent hard starting problem. It happens mainly when warm, but sometimes cold, and sometimes not at all. Usually it fires on the second round over, probably less than a second. When the problem occurs, it will crank over for 3 - 5 seconds before firing. There is no SES light, and it is not throwing any codes. When it finally fires, it seems to do so normally - no roughness, misses or high or low RPM's. I have tried releasing the key when it acts like it is going to do it, and then hit it again. Sometimes it will start normally on the second try, sometimes it will still take a few seconds of cranking.
Any ideas would be much appreciated.
Any ideas would be much appreciated.
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I have not checked the fuel rail pressure yet, also have not tried letting the fuel pressure build. Good suggestions. The fuel filter in there now has 23k miles on it. I try to change them at 30k, try being the operative word.
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From: North Texas
Originally Posted by pdqford
Does the "Check Engine" light turn off while the engine is being cranked?
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Joined: Jan 2001
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From: Central NYS
Not all ECM's are set up the same, but Ford will typically turn off the check engine light and fire up the fuel pump if the ECM detects the crankshaft position sensor signal while the engine is in crank mode.
So if the light goes off while cranking that kinda eliminates the crank sensor signal as the culprit. If it then doesn't see the cam sensor, it doesn't know which fuel injector to fire (i.e., if the crankshaft position sensor reports that cylinder number one is at top dead center. without the cam position sensor the ECM doesn't know if it is at TDC on the compression stroke or the exhaust stroke). Some ECM's will fire fuel injectors randomly in an attempt to get it started but it might have to crank over a number of times before it fires the correct injector in relation to the crank/piston position.
So if the light goes off while cranking that kinda eliminates the crank sensor signal as the culprit. If it then doesn't see the cam sensor, it doesn't know which fuel injector to fire (i.e., if the crankshaft position sensor reports that cylinder number one is at top dead center. without the cam position sensor the ECM doesn't know if it is at TDC on the compression stroke or the exhaust stroke). Some ECM's will fire fuel injectors randomly in an attempt to get it started but it might have to crank over a number of times before it fires the correct injector in relation to the crank/piston position.
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