Can someone please help?!

I have a 2004 F350 6.0 powerstoke and it cranks slow and weak. Let me start from the beginning. I bought this truck in Dallas right when I drove it off the lot my AC stopped blowing cold air. The next day as I was driving it back to El Paso all my electrical stopped working. i pulled over and replaced the alternator. Then two weeks later I drove it around during the day but at night when I tried to start it it died. After that I got a slow weak crank. I haven't been able to start it since.

I checked the starter, bought two new batteries, Changed the oil and oil and fuel filters and changed the crank sensor.

I have read a lot of forums saying it could be the ICP, FICM, and many other things. But to me it doesn't explain the slow crank.

I am thinking my harness is bad or i'm not making good ground but I sure could use a lot of help. I do know is that once I turn the key on I drop voltage on my starter.

Please Help

 

Maybe the alternator again - even though you said that you replaced it sometime back. Test it. I suppose the starter could be dragging also. You said you checked it .... what did you check?

 

I took the starter off and took it to a shop and they rebuilt it. Also I had took the truck to a mechanic and they said they put on a brand new starter but it did the same thing.

If it was the alternator wouldn't it have a normal crank when I put jumper cables? Cause it still cranks weak even with a battery charger on it

 

You bought two new batteries or installed two new batteries?

First you need to make sure you have good batteries before anything else. So either get the old ones charged back up, or replace them with the new ones (if you haven't done so already). Make sure you have clean tight connections at the battery terminals positive and negative, starter positive cable, and engine block negative battery cable terminals.

Next, a slow or weak crank is related to the starting system on the truck which includes: batteries, the positive battery cable to the starter, the starter solenoid, the starter motor, the starter mounting to engine block, the engine block to negative battery cables. All these in good CLEAN working order should provide a good crank. You obviously have a cranking signal to the starter solenoid since the starter engages, so you can rule out any problems with electrical causing a no crank.

If you have done this and still a slow crank, the starter is most likely the issue. Only other possibility would be excessive engine or manual trans input shaft bearing(if so equipped that is) rotational resistance such as internal engine damage, which is probably unlikely without other major problems or abnormal noises.

The engine will not start if the engine is not cranking fast enough. So after you get a good crank, does it start? If no, then you have one or a combination of problems.

 

I have seen poorly rebuilt and bad starters off the shelf. Those are no fun to diagnose when you recheck and diagnose something bad that should be good.

I assume the shop would have charged the batteries, or installed you new ones. They take a while to charge, but the engine should fire if working properly. The shop should be able to fix this problem and at least get it to crank normally.

You could have had a cranking problem and a no start problem occur at the same time. Anything is possible.

I have seen a burned up low pressure oil pump cause a slow crank and no start, but lets not even go there yet.

 

I bought two brand new batteries. I do need to check all the cables, is there a certain way i need to do this or can i bypass the cables to single out that problem?

 

Just check that the connections are clean and tight and no excessive corrosion. Make sure the contact areas of the terminals on the battery posts and starter posts are not corroded clean and tight.

I would install those new batteries and see what you get. You may have set of bad batteries.

 

Thank you for your help so far I will be getting to my truck tomorrow but I have a question. I was reading that some people's AC compressor would lock up and that would cause the same symptoms for the weak crank. Is this true? Cause the pulley on my ac compressor was wobbly when I first looked at it when the ac went out

Thanks

 

it happens but not a common issue with this engine. also most of the time a locked up compresser will cause an engine to not turn over at all.

 

Alright I had a chance to work on it over the weekend and this what happened. I checked all grounds and my negative cables looked old and worn. I ordered some new ones and they finally came in today. I replaced them but same result "weak crank". So I took off the belt and checked the pulley of the ac compressor, sure enough it was locked. Once I had the belt completely out I cranked it. Thank GOD it cranked normal.

However it never fired and I heard a clicking noise. Should that happen?

I'm hoping that the mechanics that had it before put it back together right and complete.

Does anyone know of a step by step tutorial on how to replace the AC Compressor?

 

Is it the pump that is locked up, or only the pulley bearing? I am assuming just the bearing as long as the clutch plate isn't welded to the drive pulley for some reason.

If it is just the bearing, you can get a clutch/pulley kit and just install that. If the pump is locked up, then you have to evacuate the system, R and R the pump as well as check for debris in the rest of the system for contamination, flush the system, and then pull a vacuum and recharge the system with the correct weight of refrigerant.

If you don't have the A/C service equipment, then you would have to have someone who does perform the job.

 

Well I got it running . I had to pit in a glow plug that the mechanics forgot to put in.

I'm not sure if It's the clutch or the whole thing. How can I tell? And what are the steps to getting to it. Like what parts do I take off to get to it? And do I go through the top or the bottom do I take the radiator off?

Thanks for the help.

 

2003 f250 6.0 ran ok, past week heard rubbing noise and smelled a little like overheated brakes/ clutch. Did not think of the smell because I was pulling 14K trailer down hills. Today after driving and sitting for 10 minutes very slow crank tried jumping nothing helped. Took belt off and it started fine. AC compressor was not spinning ceased. Hopefully helps somebody.