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Blackgrrl23
Blackgrrl23 asked in Cars & TransportationMaintenance & Repairs · 1 decade ago

2000 Ford Focus Misfire?

I have the base LX sedan, SPI engine, auto transmission, 85,000 miles.

I have changed plugs/wires/coil/PCV/checked for vaccum leaks and found none/changed EGR valve/DPFE(EGR) sensor/used fuel injection cleaner/changed fuel filter and still no improvements.

You can floor it and it refuses to accelerate at first but slowlp picks up steam and moves after a few seconds. It stumbles badly upon acceleration and goes through 1/4 tank of gas in <20 miles.

Ayy suggestions what else to check? I would suspecting the catalytic converter (maybe) but there is no sulfur smell/smoke from the exhaust that is abnormal...

I need to pass emissions this weekend too. Thanks :)

Update:

Forgot to add, I cleaned the MAF with quick drying electric cleaner but I will try a new MAF sensor as well....thanks :)

Update 2:

got the codes, P0171 and p0174...

Update 3:

I put in a new MAF and it is slightly better but still stumbles/hesitates at times...at least it doesn't die on me. I also put in new ford plugs/wires/coil for good measure and it is still acting up....any more suggestions? :)

Update 4:

OK guys (and gals)..

took it to my local shop, they had me do a new MAF sensor, EGR tube, and induction service +plugs/wires/coil/oilchange for good measure. The light went off for a good 20 minutes after I left the shop but now it's back on. What next?

Update 5:

Also the fuel pump was replaced under recall last year and there is no misfire right now (flashing CEL). It runs beautifully, but there is still a CEL. I will take it to autozone and come back with the codes...

8 Answers

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  • Marc87GN
    Lv 4
    1 decade ago
    Favorite Answer

    I would suspect the MAF or an upstream O2 sensor, but without a good scantool to see the live data, it's hard to tell. The stumbling bad on acceleration leads me to believe it's a bad MAF sensor.

    Source(s): Former Mercedes Benz Tech & MB ELITE Graduate
  • Lab
    Lv 7
    1 decade ago

    Cleaning the MAF with anything could have damaged it. Start there, look at O2 sensor and the coolant temp. sensor. The other reply is correct, without a live scanner, hard to say.

  • Steve
    1 decade ago

    Your fuel pump my have a problem with keeping up to pressure demand. You could possibly have a M.A.P. sensor problem which measures the amount or air entering the intake.

  • Casey H
    1 decade ago

    try changing the inline fuel filter or it could be the computer chip

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  • Mack
    Lv 5
    1 decade ago

    Make sure you didn't cross-wire the spark plug wires.

    Mack

  • David
    1 decade ago

    dude its a ford focus - you should be glad you made it to 85,000 miles ... time for a new car

  • midnighttoker
    1 decade ago

    CHECK MAP SENSOR

  • amariyi
    1 decade ago

    .

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