Question about 1989 Ford Bronco
First thing you should do is determine if the valve has vacuum to it start the engine unplug the vacuum line located on top of the valve place your fingertip on the end of the hose and raise the engine rpm slowly go to around 3000 rpm you should have a steady 3 to 5 inches of vacuum if not goose the throttle a few times to see if you get a signal for second or too during the throttle snap if you do or have the steady signal then the next step (with the engine running) is to place a small hose onto the vacuum port of the egr valve if you do not have a vacuum pump you can **** on the hose to simulate the vacuum signal and open the valve manually the engine should stall or or cutout and run rough until you release the suction on the hose if it does not change the idle at this point the valve will need to be removed and the egr passages will have to be cleaned with the engine off once again apply vacuum to the valve you shoul be able to hear the valve open or feel a slight pop when you release the vacuum if you cannot the valve is bad if you did not receive the vacuum signal at the beginning of the follow the vacuum line from the egr valve to its source (not sure witch style of egr system you have there is several ford used from 85 to 95 and you could have any one of them just depends) so lets just start with this for now FYI...all these test need to be be done with an engine a full operating temperature
Posted on Dec 09, 2012
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Posted on Jan 02, 2017
You probably pulled a code p0401, insufficient egr flow. Your DPFE sensor is more than likely at fault. There has been a lot of trouble with these sensors. Then reset CEL or disconnect battery for 5 minutes.
Posted on Aug 17, 2008
I would check the front o2 sensors because usually the EGR flow is detected by:
The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.
Posted on Oct 13, 2008
SOURCE: Ford F250 EGR problem
The EGR valve (Exhaust Gas Recirculator) provides a path from ******** to nose of your engine, returning some of the exhaust fumes to the intake to supposedly improve tailpipe emissions.
Uh huh, I agree. Seems like a stupid idea and each car I have cheated (that couldn't tell I was cheating) has gained a little on gas mileage but never as much as 10%.
Your Ford apparently has a sensor to rat you out if you cheat it so the quantity of fumes isn't satisfying that sensor.
This could mean that the EGR is clogged (it's a small hole passing dirty exhaust fumes), failed, or the vacuum line that controls it is cracked or otherwise broken.
Posted on Dec 09, 2008
Can you give me a code number. Also the egr ports plug in the elbow the valve is bolted to. Remove the elbow and clean the ports.
Posted on Mar 15, 2009
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