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01 Taurus dying at cruising speed

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01 Taurus dying at cruising speed

Post by Holden » Thu Nov 03, 2016 12:03 am

My 01 Taurus has developed a serious drivability problem. Once up to temp, at idle it begins to 'surge'(actually rapidly bogging and recovering) and at cruising speed it suddenly acts like its running out of gas. RPM drop, opening throttle does nothing and RPM continue to drop, until it dies. When it dies, or when its dying, I can correct the issue by quickly turning the key off and on, again. The problem returns, after a mile, or so. I initially thought it to be the transmission, until the RPM started dropping to zero and it seemed to be running out of gas.

Brakes get some boost, but feel pretty hard, so I assumed vacuum leak, but couldnt find one.

MAF sensor data seems right. Dont really know what it should look like, but MAF, Vacuum and Throttle Position curves all look practically the same.

System Too Lean Bank 1 and 2
Intermittent EGR Flow Insufficient
Intermittent Random Misfire


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Re: 01 Taurus dying at cruising speed

Post by Webmaster » Thu Nov 03, 2016 12:35 am

What are the actual codes? System too lean can be an air leak in the intake system. Post the codes here and look them up also @ https://www.obd-codes.com/
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Re: 01 Taurus dying at cruising speed

Post by warment » Thu Nov 03, 2016 6:53 am

What kind or motor? Vulcan or Duratec? You said "opening throttle does nothing"...do you mean opening the throttle body by depressing the accel pedal does nothing or manually opening the throttle body does nothing?

If you have a hard pedal, I would suspect bad brake booster
2005 Ford Five Hundred SE
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Re: 01 Taurus dying at cruising speed

Post by Holden » Thu Nov 03, 2016 4:54 pm

Not showing at the moment, but I think it was a P030x that shows up intermittently.

I checked the brake booster best I could, without taking anything apart - visual inspection, pedal falls under the foot when the engine is started, sprayed some starting fluid around the vacuum ports, no change in engine performance when brakes are pressed. If I ease into the brakes, they feel pretty normal, but a with quick press, theyre a bit hard. Its a used car and the brakes were never substantially better, so I dont really know how theyre supposed to feel. I drove it almost 2 years, before the drivability problem arose. I replaced the PCV elbow last year, to pass inspection, but that was a huge leak and only caused a rough idle and DTC.

Opening the throttle - pressing the accelerator pedal while driving. I can hear it open and the engine output doesnt change; just a steady loss of power, with some stumbling, like running out of gas. Turning the key off and on again, corrects it, for about 1 to 3 minutes of driving at 45 - 55mph.

At first it seemed like the transmission slipping/jerking/bumping, but I now believe its the tran downshifting when I gas it, but the power output drops.

Ill post more info, as I gather it. Im about to take it for a short drive to try and set some DTC.

Thanks guys

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