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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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  #1  
Old 12-14-2006
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Not a Ranger but still a 3.0

We've got a 2002 Ford Taurus that recently started giving us problems. The regular scheduled maintence and all has been kept up to date.

About a month ago the Cam position sensor went bad in it and we fixed it, no problems there other than finding the correct part. The problems it had at that time were straightened right out.

A couple weeks ago something else started acting up that we haven't been able to figure out. The car started loosing power every once in a while. It'll run fine normally, then you can floor the gas pedal and get maybe 20mph top speed, the engine dosen't even rev up, but it will gradually (slowly but gradually) start gaining power. That is the best I can describe it from my mother's account, it happened to her and my sister on multiple occasions, yet never when me or my father were in the car. What has happened to me is that a couple of times sitting at a traffic light idling it will kinda hickup (the RPMs drop excessively for a second or two) then surge enough that it almost tries to overpower the brakes, when the gas pedal isn't being touched. Granted I am lightly pressing the brakes but that's all it usually takes when a a complete stop.

(Begin Ranting)


Since the first codes saying the cam sensor wen't bad the car hasn't thrown any codes. Dad hasn't helped the situation any, he's a great mechanic but when it comes to FI he'll believe anybody, and start throwing sensors at it in hopes of appeasing the FI gods. The first thing was a "mechanic", who never seen or heard the car, told him that all it needed was to replace all the 02 sensors. The car only having ~85K miles on it it's unlikely that they were going bad, on top of theat it's extremely unlikely that all would go bad at the same time. I also know that everyone that dosen't know FI automatically blames all problems on the O2 sensors. Well when dad got home with 2 O2 sensors I told him that he needed to take them back, but he installed them any way. Guess what it didn't fix the problem, but I had tried to warn him. Then aginst my recommendation he goes and gets the 2 after cat sensors "just in case they are bad to", once again it didn't fix the problem. So that's 4 perfectly good sensors and $200 in the trash, just because he wouldn't listen to me. Then his next step is to take it to a shop, the mechanic there runs the most basic diagnostic possible on the car, and drives it a couple days to try to get the problem to reoccur (it of course didn't). The mechanic tells him that the portion of the MAF on that car that reads the barometric pressure is messed up and it's the only thing he can find wrong with the car, ok so there goes another 100-150 dollar part on the car that didn't fix the problem. Now 3-400 dollars in sensors plus what ever the test cost he's getting ready to run more. He's planning to take it back to the same guy to have more tests run on the car, and inevitably more money thrown away.

I can't figure out why he's so determined at throwing money at the wrong solutions when he's currently on LWOP due to rotor cup (maybe that's supposed to be rotor cuff IDK) surgery and can't work for the next month or two. He can't really afford to keep that up, needs to find right the fix.

(End Ranting)

Sorry for the ranting. If you skipped all that it basically said that dad waisted money on replacing all 4 O2 sensors and a MAF sensor without fixing the problem.

Before he goes and wastes anymore money on the car can yall come up with anything that might be causing the problem?

Thanks in advance for the help!

-Josh
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Old 12-14-2006
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just so ya know i skipped over the ranting part cause that was too much reading for me, but I had the same symptoms as you talked about in the first part, once in a while when i hit the gas they thing would just kind of bog itself down and never speed up, and same thine sittin at lights, it would surge all of a sudden and start rolling forward, after a couple weeks the check engine came on, checked the codes and found out the right side oxygen sensor was bad, replaced that and haven't had a problem since
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Old 12-15-2006
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No problem about skipping over the rant, I just copied it straight over from what I typed on TRS.

I just got better description of what is happening, because it just happened to my mom again. The car just started bucking (way it sounded they were already moving at this point) then shut it's self off. When she restarted the car she stood on the gas pedal and the RPMs only got up to 1000, after a few seconds it slowly crept up to 2000 RPMs. She let it sit for a few minutes afterwards and tried to restart it but it wouldn't stay running or it had the same problem about the RPMs.
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  #4  
Old 12-18-2006
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Looks like the problem has been found. The car died on Friday so we towed it back to the shop, results point back to the MAF. Apparently when dad replaced it he got a rebuilt/reman unit that was bad. Got a new sensor on order should be in and running in the next day or two.
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