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Old 03-12-2016, 12:00 PM   #1
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Losing my mind!!

Hi everyone, I'm having an issue that I just can't seem to overcome with my 2001 Focus SE. It's a SOHC. Just built a new engine for it and it runs great!
BUT!!!! When I drive it, if I stop and then depress the accelerator hard the abs and brake lights come on on the dash and the car stumbles, sometimes stalls.

I've replaced the throttle body & tps sensor, the fuel pressure regulator, fuel pump & filter, and the coil.

I'm suspicious that it's some type of electrical issue but can't find it...chasing a ghost! Anyone else experience this issue? Anyone got a solution besides C4??

I really need help on this.


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Old 03-12-2016, 05:21 PM   #2
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Moved to General Tech Chat

Replacing too much IMO, prob. need to chase loose wires/poor connections instead - starting with ones at the battery & the grounds from there and moving down the line after that.
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Old 03-12-2016, 09:15 PM   #3
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Bad wiring can cause all kinds of issues, including dash lights and stuttering. As sailor said, check your wires, but just because it's easy start with the ground, it's on the driver side and very easy to see if it's corroded.
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Old 03-13-2016, 04:08 AM   #4
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If problem didn't show up till motor fix then tells you you have damaged wiring somewhere.

Gotta wonder why you changed all those parts that have nothing to do with that, the lost mind issue????? Now lost money as well................................
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Old 03-13-2016, 09:20 PM   #5
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Thanks for all the input, but the problem isn't in the wiring. I checked every bit of the harness and all the connections to sensors and ground. I also changed the speed sensor last night and drove the car. It ran fine, then when I thought all was well, I stopped at a stop sign and when I accelerated the abs & brake lights came on and the car stumbled to a stall. Today I double checked all fuel lines and took it for a drive on the freeway. As long as I didn't floor it from a stop it ran like a swiss watch! On the freeway I floored it and it downshifted as it should and ran absolutely perfect! I put it on cruise and drove over 20 miles without an issue. Got off the freeway, stopped for a light, and when I hit the gas it did exactly the same screwey thing!!! Almost stalled while the abs & brake lights lit up on the dash then went out. I mean...REALLY!!!!!! I don't want to have to pay a Ford dealer to figure out this issue but might have to. I've taken out and installed new SOHC Focus engines before and NEVER experienced this problem. HELP!!!!!!
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Old 03-14-2016, 02:00 PM   #6
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I've replaced the coil harness plug on both my Foci. The wires are a bit short so they tend to fray and crack right at the plug. Hard to see, and doesn't throw a code until it's really bad.
Can't imagine why that would light up brakes and ABS, but worth a look, anyway.
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