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Old 02-18-2013, 04:29 PM   #1
yotunstoppable
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complicated issues?

Long post, hang with me.

Sister in law's 2000 focus ZX3 died on me a while back. It had a blown fuel pump fuse which I replaced and I also replaced the fuel filter for her (yes it is in the correct orientation) Car ran wonderfully but needed brakes so we left the car parked in my driveway for about a month till she brought me some brakes and a new battery for it. Battery was dead and so I jumped it off and drove it to my shop. It ran like a top. Did new brakes and then replaced the battery. After getting back in it to run the new brakes down the road a bit it immediately ran bad, but did crank and start on it's own) I only made it about 200 yards down the driveway when it totally cut out on me. Would not start back. Will crank quickly but does not even hit at all. Little ether and it will fire up but you have to keep fiddling with the throttle to keep it running. Will rev up to decent rpm but feels a little rough. Nothing crazy. I am at my wits end with this thing, I have tried the fuel reset switch behind the passenger kick panel and it didn't feel like it was depressed. Question:
1: I can keep it running with the throttle indefinitely, does this indicate that the fuel pump is indeed running correctly.
2:What could be causing this problem?
The thing literally ran like a sewing machine before the battery change, nothing else changed. I've checked all the fuses and relays and they all check out fine.
2:I


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Old 02-18-2013, 04:41 PM   #2
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First guess because of the battery change would be to double check all the ground cable connections there. Some folks have seen issues where they connect to the battery terminal as well as where they connect to ground.

Luck!
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Old 02-19-2013, 10:36 PM   #3
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'1: I can keep it running with the throttle indefinitely, does this indicate that the fuel pump is indeed running correctly.'

If you mean you can drive car around and it just won't idle without dying then yes, but if you mean keeping it running but erratically and only while car sitting still then no. The pump can be marginal and run but just barely, fuel pressure check would show that.

Key thing I see is that car sat at some point, I have seen pumps sit for a while and upon restart they work fine but somewhere down the line like hour later or such, they choke. Had it even happen to me, car down and sat one year, new head (valvejob) and restart ran fine, car driven on road maybe five minutes, parked and pump dead when I came back in 15 more minutes for more driving. These things don't like sitting in ethanol laced fuel, sometimes it corrodes things in pump, mine was all corroded inside when I disassembled it after changing. I also sold plenty of pumps at the auto store where people gave me similar stories. Never saw those levels of corrosion until ethanol showed up.

Ether is the key, I use it too to diagnose fuel or spark issue, if ether makes it start when it wouldn't before then fuel issue.............
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Old 02-19-2013, 11:18 PM   #4
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Doesn't this car have an Idle Air Control Motor???
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Old 02-20-2013, 12:03 AM   #5
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IAC has nothing to do with engine performance past idle...........
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Old 02-20-2013, 05:28 AM   #6
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Do a voltage test on the TPS, see what the range is. I think your TPS crapped out on you on the bottom side. You might also want to remove the IAC and see if it is clogged shut. A little carb cleaner and it should clean right up. There should be no gasket. It is difficult to reach though. It is under the intake manifold, from what I've heard you have to remove the air box, battery, and then you can reach under there. Double check all the dumb stuff- vacuum, etc.

I would try the IAC cleaning before messing with the TPS, that way at least it might idle. If you feel like you have to replace the TPS- that is a big deal in that car. You must purchase a throttle body and TPS assembly. You can't purchase a TPS from a parts store- they will sell you the one for a MT and it will not work on an AT but you won't be able to return it. If you have an MT, then great, go get one.

If you have an AT, then check back, and we'll do our best to help you with it. We have a Ford OEM parts vendor who gives us a whopping discount.

I would also try anything that costs nothing: clean the MAF, clean the spark plugs, double check the air intake, double check the PCV vacuum line- it can decay, split, or collapse under idle (if you have idle). I'd test it by disconnecting the vacuum side, and capping off the intake. If it idles like that, then replace the line and the PCV.
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Old 02-20-2013, 06:35 AM   #7
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The IAC will always have a gasket, it sticks to the manifold, either papaer or a rubber o-ring affair.

I got the impression OP was complaining about no power and bad running everywhere, not just at idle. Bad IAC will not impact starting if the throttle is held open, like that it will start and run fine, just die every time foot removed from the throttle.
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Old 03-07-2013, 01:45 PM   #8
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Problem turned out to be fuel pump. I am in the process now of trying to find a replacement for the original pump (the car is not worth buying a full new assembly for and I'm doing this out of the kindness of my heart and am not going to go through the hassle of modifying the tank. Calling rock auto today to ask about a part.
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Old 03-09-2013, 12:34 AM   #9
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Why do you think the car isn't worth a new pump? You should see what they are selling for around here.
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Old 03-09-2013, 09:23 AM   #10
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She only paid 400 for it, and i've already put about 30 hours into it. I called rock auto and they do not sell the pump according to the girl who answered the phone, i'll try to find one on ebay or at a pull a part.
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