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Old 01-15-2011, 10:41 PM   #1
Topo101
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Changed my alternator, car won't start

Hello, I'm new to the Focus scene, so I have no idea what's going on...

So, is there any reason my car won't start after changing the alternator?

I changed the alternator today (well, finished changing it) and after I bolted everything back down, plugged everything back in and ran the belt like focushacks.com said to, the car won't start, at first I didn't get anything, but now it's cranking and cranking but won't go.

I've tried jumping it, I've tried charging the battery and now all the car does is cranks and cranks all day long, if I push the gas pedal it'll kind of stutter like it wants to start, then the starter will grind like it does when you try to start an already running car and it will resume cranking all day long.

2002 SVT.

Thanks!


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Old 01-15-2011, 11:20 PM   #2
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Sounds like you have something unplugged. Start looking at spark plug wires, coil pack, fuel pump fuse (#12 in the engine bay fuse box), injector harness, etc. The alternator shouldn't prevent the car from starting seeing that the battery has plenty of cranking amps to spin the motor. Something else got unhooked. Remember, combustion is: compression, fuel, and spark.
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Old 01-16-2011, 12:23 AM   #3
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I'll recheck everything I unplugged for a loose connection, and fuses again.

The ONLY thing I can think of is I removed my FPR trying to make room to squeeze the alternator out, I ended up losing both the bolts, but replaced them, maybe I didn't put it on right?

The engine is spraying fuel or anything, but it does try to start when tap the gas pedal a few times.

An alternator shouldn't have been this hard
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Old 01-16-2011, 08:39 AM   #4
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Removed your FPR? Our cars don't have fuel pressure regulators...only way that's possible is if you have a custom return fuel system. If you mean the fuel rail or injector harness, then I think it's a fuel problem.
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Old 01-16-2011, 09:29 AM   #5
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did u bump the vacuum line off of the fuel rail? It attaches to the center of the fuel rail on the underside. The car should start without this line intact, just run like poo.

How many of the connections in the wiring harness did you remove? to get more clearence with the fuel rail, i removed some on the drivers side of the engine bay and one went to the coil pack, but its been a while and i cant remember.
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Old 01-16-2011, 11:16 AM   #6
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Ill check that vacuum line. If I remember right, I removedabout 5-6 connections, including grounds and the 2 that hook to the alternator.

I removed the piece located on the end of the fuel rail, held on by 2 7mm bolts, has 2 o-ring seals and a small amount of fuel came out when I pulled it out; that's the only fuel related thing I can think of I was messing with
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Old 01-16-2011, 02:45 PM   #7
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You mentioned the grounds in your last post, which is the comment I was going to make. Also, if you can run codes, that might point you at something specific.
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Old 01-16-2011, 02:52 PM   #8
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that regulator is a pulse width module that monitors engine vacuum and adjusts fuel accordingly. If it detects no vacuum it will dump fuel, so maybe that will help.
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Old 01-16-2011, 03:42 PM   #9
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did you put in a new motocraft alt,, because within 10 months i went through two rebuilt alts and one brand new one,(a local shop put them in, i only paid for one) before i took it to ford, they told me it needs a motorcraft, and i have had no problems since.
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Old 01-16-2011, 05:57 PM   #10
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Quote:
Originally Posted by mikebontoft View Post
that regulator is a pulse width module that monitors engine vacuum and adjusts fuel accordingly. If it detects no vacuum it will dump fuel, so maybe that will help.
Well, this sounds like the most likely culprit, but the only thing I did was removed it. I popped it back in to place and bolted it right back up, after losing its 2 bolts and a socket to somewhere in the engine bay. So I don't know if I didn't put it in right, or I broke it some how maybe?

If this is the problem, how can I go about seeing if it truly is what's wrong?
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