Disconnecting MAP sensor.
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Disconnecting MAP sensor.
I have a 95 bronco with the 5.8. It started to sputter and stall on me a few days ago. got to a point where i could start it, but it would sputter and stall out in a few seconds.
fuel filter changed, fuel pump good, and electrical good. i pulled codes and got a trouble code of 33 (EGR valve). changed out the egr valve and sensor with no change.
if i disconnect the vacuum line from the MAP sensor the vehicle returns to normal idle and revs fine, but if I put it in gear and try to drive it stalls. changed MAP sensor, but same results. with the vacuum line disconnected it runs fine until i put it in gear and try to drive away.
any ideas?
fuel filter changed, fuel pump good, and electrical good. i pulled codes and got a trouble code of 33 (EGR valve). changed out the egr valve and sensor with no change.
if i disconnect the vacuum line from the MAP sensor the vehicle returns to normal idle and revs fine, but if I put it in gear and try to drive it stalls. changed MAP sensor, but same results. with the vacuum line disconnected it runs fine until i put it in gear and try to drive away.
any ideas?
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Welcome to FTE and the Big Bronco Forum.
Code 33 is still your problem.
Code 33 - EGR valve did not open. EVP sensor out of voltage range (it will be if the valve doesn't open and change the resistance value of the sensor).
If replacing the EVP sensor didn't fix the problem then obviously it is not the reason Code 33 was generated. In fact the most common cause for Code 33 to be triggered is a loss of vacuum to the EGR valve. The second most common cause is a failed EGR valve. Check that the valve actually opens when vacuum is applied. You will most likely have to remove the valve to see the pintle move at the base of the valve. Check that the vacuum supply to the EGR valve is intact.
Code 33 is still your problem.
Code 33 - EGR valve did not open. EVP sensor out of voltage range (it will be if the valve doesn't open and change the resistance value of the sensor).
If replacing the EVP sensor didn't fix the problem then obviously it is not the reason Code 33 was generated. In fact the most common cause for Code 33 to be triggered is a loss of vacuum to the EGR valve. The second most common cause is a failed EGR valve. Check that the valve actually opens when vacuum is applied. You will most likely have to remove the valve to see the pintle move at the base of the valve. Check that the vacuum supply to the EGR valve is intact.
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