Question about 1997 Ford Aspire
'97 ford aspire, AT, A/C. Took car to get smogged and check engine light on reading a EGR flow malfunction. Can someone give me a diagram or step by step instructions on how to solve this problem, I have a generic manual yet I it does not provide picture description. Thanx.
Exhaust Gas Recirculation (EGR) System
The exhaust gas recirculation (EGR) system recirculates exhaust gas into the intake manifold (9424). This lowers combustion temperatures and reduces the formation of oxides of nitrogen (NOX).
The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the powertrain control module (PCM) (12A650). The EGR valve (EGR valve) (9D475) is vacuum actuated. The vacuum hose routing diagram is shown on the Vehicle Emission Control Information (VECI) decal. EGR operation stops when the engine temperature is cold, to improve driveability. The PCM controls the EGR solenoid vacuum valve (9D474). When energized the intake manifold vacuum outlet fitting and cap (9A474) allows exhaust gas to be circulated in the engine to be burned.
Posted on Feb 27, 2009
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Posted on Jan 02, 2017
SOURCE: no vacuum to egr valve
there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system
Posted on Jan 15, 2009
P1744 is probably the TC going on the way out. :(
P 340 is probably the sensor itself. Don't get the Dorman one if it is the OHV motor.
P 401 is probably a bad DPF EGR sensor.
Posted on Jul 26, 2008
How does the oil look? Is it milky or is there any discoloration? Is any moisture or steam vapor coming out of the exhaust pipe? The EGR fault is most likely being triggered from the cylinder missfire. Sounds like you might have a head gasket blown, and/or a cracked or warped cylinder head from the overheating.
You can run a compression test to help determine this.
Good luck...i hope this helps you troubleshoot the problem.
Posted on May 09, 2009
You need to check the passages from the egr valve to the intake to see if there is excessive carbon buildup thereby blocking the passage to the intake. The principle is that when the test for the code runs it is to determine if the egr system is operating correctly. It opens the egr valve to lean out the fuel mixture an so determine if the system is operating correctly. If the code is for electrical operation of the valve it will be an electrical issue
Posted on Aug 14, 2009
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