2008 F250 5.4L vacuum noise, burnt smell, no start
#1
2008 F250 5.4L vacuum noise, burnt smell, no start
So this morning I started my truck to move it out of the driveway and it sounded funny almost like I was running a ship vac under the hood. I moved it and shut it off and when I shut the truck off it sounded like screeching tires. I thought it was weird but chalked it up to it being cold. When I came home I started the truck again and I got the same vacuum noise. I figured I would let it run some since it was pretty cold out. All of a sudden I heard the noise stop so I went out and all I smelled was a burning smell but the truck was idling fine and running nice and quiet like it usually does. So I shut the truck off and then it wouldn't start again. So I tried to jump it still wouldn't start would barely try to crank. I crawled under smacked the starter a few times jumped it again and it started. I left it running for 20 mins after that no noise sounded fine. Any thoughts on what this could be? Thanks in advance
#4
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#6
Just wanted to update: started the truck this morning it cranked at first and didn't start but that's better than it was yesterday. I drove it to work and it ran perfect just like it should. I am guessing it was something belt driven frozen or locked up and once it heated up from running the truck it broke free or there was moisture in the starter or something. I can't think of anything else that it could have been. Whatever it was it out a pretty hard draw on the battery to kill it that quickly. I'm just chalking it up to the cold weather and hoping it's good to go now. I guess if I end up having to replace the starter or something belt related its not the end of the world it could be worse but I'm hoping it's good to go now.
#7
Are you sure your coolant is mixed to the required 50/50 mix (-34*F)? If ambient temps are below +32*F and your coolant specific gravity is too light it could be the water pump that froze! Which means your close to cracking an engine block. Dont know where you live to define what cold is? Read the owners manual. Theres a ton of good service tips there for your reading pleasure.
What the .... is a ship vac anyway? lol.
What the .... is a ship vac anyway? lol.
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#8
Are you sure your coolant is mixed to the required 50/50 mix (-34*F)? If ambient temps are below +32*F and your coolant specific gravity is too light it could be the water pump that froze! Which means your close to cracking an engine block. Dont know where you live to define what cold is?
What the .... is a ship vac anyway? lol.
What the .... is a ship vac anyway? lol.
#9
So after using the truck today I think I have determined the starter is bad. Got the battery, alternator, and starter tested. I was told alternator and battery were fine but the battery didn't have enough charge to run the starter test. Every time I started the truck today it would chug chug chug before it would start. Sometimes it wouldn't start I would have to try it a few times before it would start. Once it was running it ran perfect I am going to look for another starter and go from there. From searching it doesn't seem to hard looks like the consesus is it is a PITA to get to and get the bolts out so I guess we will see.
#10
For the starter not working, assuming you have done something to actually charge the battery up to full power [otherwise, there's no reason to expect the starter to work properly if the battery isn't charged enough to run a 'starter test'], I would suggest first examining the power and ground cables between the starter, truck and battery, as well as unbolting the connections and cleaning each connector before reattaching it.
#11
For the starter not working, assuming you have done something to actually charge the battery up to full power [otherwise, there's no reason to expect the starter to work properly if the battery isn't charged enough to run a 'starter test'], I would suggest first examining the power and ground cables between the starter, truck and battery, as well as unbolting the connections and cleaning each connector before reattaching it.
#12
So I had the truck charging for about 3 hours today. I did not check any of the connections. Started the truck and it still did not start like normal it chuffed and then started. I hear the vacuum noise again truck ran for around 30 secs then the truck stalled out the tach and speedometer needles were bouncing and you could hear a clicking sound inside the truck also the CD player was cycling rapidly. I tried to restart the truck and when you turn the key all you get is one click doesn't try to turn or do anything. Obviously I think I can rule out anything belt related in my mind I am thinking three different things battery, starter, bad ground/wiring issue.
#13
If your hearing a vacuum sound its likely a cracked hose on the intake side (PCV or??) or the intake manifold itself or something has become disconnected. With a vac leak as big as it sounds like you have of course it wont run. Start lookin for splits cracks etc... Look at the intake tract. If the hose from the air cleaner has come lose on the throttle body that will exhibit your symptom as you will get the vacuum like sound. In this case the intake air is bypassing the MAF sensor. The computer will be measuring the mass air charge incorrectly thus causing drive-ability issues.
As for the starting problem you need to clean all the electrical connections associated with the secondary system (ALL the Large battery cables) followed by a spray of ignition sealer after you clean and tighten them. Dont rule out a bad cable. A battery cable can visually inspect ok yet be bad internally. Ohm test all cables. All should exhibit a very low Ohm reading.
As for the starting problem you need to clean all the electrical connections associated with the secondary system (ALL the Large battery cables) followed by a spray of ignition sealer after you clean and tighten them. Dont rule out a bad cable. A battery cable can visually inspect ok yet be bad internally. Ohm test all cables. All should exhibit a very low Ohm reading.
#14
If your hearing a vacuum sound its likely a cracked hose on the intake side (PCV or??) or the intake manifold itself or something has become disconnected. With a vac leak as big as it sounds like you have of course it wont run. Start lookin for splits cracks etc... Look at the intake tract. If the hose from the air cleaner has come lose on the throttle body that will exhibit your symptom as you will get the vacuum like sound. In this case the intake air is bypassing the MAF sensor. The computer will be measuring the mass air charge incorrectly thus causing drive-ability issues.
As for the starting problem you need to clean all the electrical connections associated with the secondary system (ALL the Large battery cables) followed by a spray of ignition sealer after you clean and tighten them. Dont rule out a bad cable. A battery cable can visually inspect ok yet be bad internally. Ohm test all cables. All should exhibit a very low Ohm reading.
As for the starting problem you need to clean all the electrical connections associated with the secondary system (ALL the Large battery cables) followed by a spray of ignition sealer after you clean and tighten them. Dont rule out a bad cable. A battery cable can visually inspect ok yet be bad internally. Ohm test all cables. All should exhibit a very low Ohm reading.
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