HELP! 2007 Taurus - Transmission Shift hiccup from 1st gear to 2nd gear
Hi all - I'm new to posting in the forum, but I've referred to this place a lot over the years for help with repair and maintenance.
I currently have an issue that I have not been able to diagnose/repair and was hoping for some help.
I have a 2007 Taurus with 136,000 miles. About a month ago - when the engine is warm - it started to have this hiccup (best description) that happens just after it shifts from 1st to 2nd gear. No lights or codes are on or available. My first thought was I had a transmission issue starting, and since it had been 60,000 since the last transmission fluid/filter change, I took it in to Certified Transmission for a diagnosis and service. They said the transmission looked fantastic and the jerk I was noticing was most likely due to needing a tune-up, as they said they noticed a slight "miss". But the transmission itself got a clean bill of health.
My hunch was it might be the VSS (Vehicle Speed Sensor) so we changed that and it ran fine for about day. So then I thought maybe we got a bad VSS (aftermarket) so we replaced it again. Same thing. Ran fine for almost 2 days, then started acting up again. So I thought we would try a Motorcraft VSS. Same result. We also changed the Cams Sensor (but not the synchronizer) and replaced the plugs and wires.
We have a code reader that runs Bluetooth to an android phone - no codes - and when driving the vehicle used it to graph the acceleration. When we charted it, there would be a steady incline until it would hiccup just after shifting into 2nd then it would have a small sudden drop (looked like a “V”) on the graph and then continue to accelerate. All other shifts from 2nd to 3rd and from 3rd to 4th and OD performed normally without a hiccup.
We only get this little slip at the start of 2nd gear.
Any ideas or suggestions as to what we might try next? Anyone experience the same or similar issue?
Thanks for your input!
Hi all - I'm new to posting in the forum, but I've referred to this place a lot over the years for help with repair and maintenance.
I currently have an issue that I have not been able to diagnose/repair and was hoping for some help.
I have a 2007 Taurus with 136,000 miles. About a month ago - when the engine is warm - it started to have this hiccup (best description) that happens just after it shifts from 1st to 2nd gear. No lights or codes are on or available. My first thought was I had a transmission issue starting, and since it had been 60,000 since the last transmission fluid/filter change, I took it in to Certified Transmission for a diagnosis and service. They said the transmission looked fantastic and the jerk I was noticing was most likely due to needing a tune-up, as they said they noticed a slight "miss". But the transmission itself got a clean bill of health.
My hunch was it might be the VSS (Vehicle Speed Sensor) so we changed that and it ran fine for about day. So then I thought maybe we got a bad VSS (aftermarket) so we replaced it again. Same thing. Ran fine for almost 2 days, then started acting up again. So I thought we would try a Motorcraft VSS. Same result. We also changed the Cams Sensor (but not the synchronizer) and replaced the plugs and wires.
We have a code reader that runs Bluetooth to an android phone - no codes - and when driving the vehicle used it to graph the acceleration. When we charted it, there would be a steady incline until it would hiccup just after shifting into 2nd then it would have a small sudden drop (looked like a “V”) on the graph and then continue to accelerate. All other shifts from 2nd to 3rd and from 3rd to 4th and OD performed normally without a hiccup.
We only get this little slip at the start of 2nd gear.
Any ideas or suggestions as to what we might try next? Anyone experience the same or similar issue?
Thanks for your input!