'99 Ford Contour has always started smoothly. Last week I had a pair of oxygen sensors replaced (downstream bank 1 sensor 1 reading "system too lean") because the check engine light was on, but there was no problem with the engine starting or running. They also cleaned the fuel injectors and intake.
But following that service, my car now cranks a lot longer before turning over, especially upon cold start. On warm start takes slightly longer to turn over than it used too, and there is some knocking. How could this relate to the oxygen sensor repairs? What can I expect the repair shop to do to diagnose this problem? Thanks!
2006-07-22 17:43:15 · 2 answers · asked by Steve Polychronopolous 5 in Cars & Transportation ➔ Maintenance & Repairs
A common problem on the Contour is a defective fuel pump. There was an extended coverage recall on these pumps at one time, but is most likely expired. When you turn the engine off, the fuel pressure leaks back into the tank, which causes a longer crank time the next time you try to start. Eventually the pump will give out altogether and leave you sitting. If the repair shop replaced 02 sensors for a lean code, they were mistaken in their diagnosis. A lean code is from either too much air, such as vacuum leak or not enough fuel, if the vehicle was running lean, I would bet it was from low fuel pressure. I would suggest a second opinion on your repair, preferably a Ford dealer that works with this type of vehicle all of the time. 02 sensors will not cause the problem you are having. The 02 sensors are not used for fuel delivery until after they have reached operating temperature, which is long after the vehicle is started.
2006-07-22 18:01:22 · answer #1 · answered by yugie29 6 · 0⤊ 0⤋
i wount even mess with it take it back to who ever fixed and let them solve the problem its there f u c k up
2006-07-22 17:49:18 · answer #2 · answered by Anonymous · 0⤊ 0⤋