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
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
SOURCE: engine malfunction
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
Also remove carbon built up behind the EGR valve and the EGR passage tube.
Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.
More un-metered air (leaks) will lean out the fuel mixture.
Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.
At idle,just spray and listen for the RPM surge.
The in-rush of carb clearer will increase the RPM on the motor.
Record the problem spot(s) and address it later.
EGR carbon built up require 2+ hours to clean from start to finish.
You will need a new EGR base gasket before your start.
Locate and remove the EGR valve after the vehicle is cool down.
Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.
Remove the EGR valve.
Inspect the location of the carbon built-up inside the valve and the EGR passage tube.
SOAK these areas with WD-40 spary.
You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.
RE-SOAK the carbon and let it sit for over-night will also help.
One the last round,pass a shop vacuum of the EGR valve and the passage pipe.
Install the new EGR gasket and connectors.
Allow the vehicle to warm up outdoor to burn up any remaining WD-40.
Take it for a test drive.
Please rate my answer if it's useful to you.
Posted on Dec 19, 2009
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