Nick Buol
New CEG'er
My 1999 Contour SE Sport (2.5L) has been the most problem ridden car I have ever owned, yet I love to drive the sucker....
Anyway, my CEL came on (again) about 4 weeks ago. Typical P0171 and P0174. Last time they came on, it was new O2 sensors all around. That was about 9 months ago. So I clear the codes and let it go for the time being to see if the same codes come up again.
Well, they did this weekend, but I didn't get a chance to get them read until today.
Today's reading shows P0171, P0174 AND P0460 (Fuel Level Sensor A Circuit Malfunction).
Hmm. The gas gauge seems accurate.
Anyway, yesterday morning, I went out to start the car (cold morning) and it started fine, but then the RPMs dropped to about 400 and the car stalled. Never happened before. I start it back up, and give it a few revs. Let off the gas, it slows down again, and starts to stall.
When driving, it is fine. I just watched it at stop lights and gave it a gentle touch of gas while braking, and made it to work OK.
I am thinking vacuum problem possibly? But I am looking to the more experienced experts here.
Some other key data. 79K miles.
Like I said, new O2 sensors less than a year ago, new fuel pump 2.5 years ago, new alternator this summer...
I was told by ProjectSHO89 here that I shouldn't be surprised if the P0171 and P0174 codes come back after the "professional" diagnostic (and O2 sensor replacement earlier this year) because they don't diagnose vacuum issues.
So. Ideas? I am going to check for vacuum leaks tonight (I am sure that I can find a sure fire way to do that), but I am still wondering about the P0460 as well...
Anyway, my CEL came on (again) about 4 weeks ago. Typical P0171 and P0174. Last time they came on, it was new O2 sensors all around. That was about 9 months ago. So I clear the codes and let it go for the time being to see if the same codes come up again.
Well, they did this weekend, but I didn't get a chance to get them read until today.
Today's reading shows P0171, P0174 AND P0460 (Fuel Level Sensor A Circuit Malfunction).
Hmm. The gas gauge seems accurate.
Anyway, yesterday morning, I went out to start the car (cold morning) and it started fine, but then the RPMs dropped to about 400 and the car stalled. Never happened before. I start it back up, and give it a few revs. Let off the gas, it slows down again, and starts to stall.
When driving, it is fine. I just watched it at stop lights and gave it a gentle touch of gas while braking, and made it to work OK.
I am thinking vacuum problem possibly? But I am looking to the more experienced experts here.
Some other key data. 79K miles.
Like I said, new O2 sensors less than a year ago, new fuel pump 2.5 years ago, new alternator this summer...
I was told by ProjectSHO89 here that I shouldn't be surprised if the P0171 and P0174 codes come back after the "professional" diagnostic (and O2 sensor replacement earlier this year) because they don't diagnose vacuum issues.
So. Ideas? I am going to check for vacuum leaks tonight (I am sure that I can find a sure fire way to do that), but I am still wondering about the P0460 as well...