Taurus Car Club of America : Ford Taurus Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1
My 2008 Taurus with 65K miles has developed an odd hesitation. It usually occurs at highway speed (around 70 mph), under light acceleration (1500 rpm) and usually when going uphill. It will appear at other times, but that scenario is the most predictable. I have also tried to see if the condition would worsen under hard acceleration at highway speeds, but have no problems. I have cleaned the mass air flow sensor with no improvement. I also do not have any check engine lights, and the Autozone scan showed no codes. Has anybody dealt with this situation?
 

·
Registered
Joined
·
180 Posts
Exact same thing happened to my 2008 around the same mileage. I thought for sure it was the transmission sensors but it's the spark plugs and/or COPs. Believe it or not a simple spark plug change will probably fix it but I changed both the plugs and COPs. Motorcraft has a cheap kit that comes with everything you need. Comes with 6 plugs, 6 COPs and upper intake gaskets. Price has gone up a little but still an awesome deal.

https://www.ebay.com/itm/Genuine-Ford-Kit-BA5Z-12259-A/273285147965

Since ya gotta pull the upper intake to change the rear plugs it's nice to just replace the COPs while ya got it apart. There's a few good youtube videos if your gonna do it yourself.
 

·
Registered
Joined
·
155 Posts
I watched a video about this exact problem filmed by SMA. He found the problem using mode 6 data. Turned out to be a misfire, if I recall correctly, that did not set a code.
 

·
Registered
Joined
·
180 Posts
I drove mine a looong time with this problem before replacing everything. It eventually started going into limp mode and throwing COP codes. I had to pull over every time and cycle the ignition a few times to get it out of limp mode. I've read that bad COPs can eventually take out the main computer so ya probably wanna get it repaired pretty quick.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #5
I watched a video about this exact problem filmed by SMA. He found the problem using mode 6 data. Turned out to be a misfire, if I recall correctly, that did not set a code.
I took my vehicle to a local mechanic I trust. I explained my symptoms, even mentioned the video you posted, but unlike the guy in the video, his mode 6 scan showed no misfires. The misfires for me seem to happen in a very narrow range, 1200-1400 rpms, always going slightly uphill with light acceleration. It's possible he may have accelerated too heavily on his test drive. Despite the occasional misfire, the car drives very well.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #6
Exact same thing happened to my 2008 around the same mileage. I thought for sure it was the transmission sensors but it's the spark plugs and/or COPs. Believe it or not a simple spark plug change will probably fix it but I changed both the plugs and COPs. Motorcraft has a cheap kit that comes with everything you need. Comes with 6 plugs, 6 COPs and upper intake gaskets. Price has gone up a little but still an awesome deal.

https://www.ebay.com/itm/Genuine-Ford-Kit-BA5Z-12259-A/273285147965

Since ya gotta pull the upper intake to change the rear plugs it's nice to just replace the COPs while ya got it apart. There's a few good youtube videos if your gonna do it yourself.
Your suggestion makes perfect sense, but I went a little cheap and just changed the plugs. The plugs that were removed had almost twice the gap and I'm probably lucky that no coils were ruined. The good news is the new plugs cured my misfire issue!
 

·
Registered
Joined
·
180 Posts
Your suggestion makes perfect sense, but I went a little cheap and just changed the plugs. The plugs that were removed had almost twice the gap and I'm probably lucky that no coils were ruined. The good news is the new plugs cured my misfire issue!
Glad that worked out for you but ya might still get some COP codes later. I changed all 6 plugs and the 3 rear COPs to start and everything was fine. I got a code for one of the front COPS about 9,000 miles later so I just changed all 3 front ones since I already had them. Now for the really bad news: My 2008 just went into limp-mode the other day and kicked out the dreaded Trans Speed Sensor Code (P0717) :(:(. Only done it once so far so I'm just gonna keep driving it indefinitely. A couple ignition cycles or a quick battery disconnect gets her out of Limp-Mode. She just turned over 95,000 miles.
 
1 - 7 of 7 Posts
Top