Check for
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
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clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
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Also remove carbon built up behind the EGR valve and the EGR passage tube.
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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.
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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.
Cheers,
Mustgo
Check connections to EGR valve, which attaches to intake manifold and has tube connecting to exhaust manifold. If vacuum and electrical connections are OK, replace EGR valve. Valve looks a bit like a flying saucer from the top, 2-3 inches across. Once removed, clean the tube out with wire brush to ensure proper operation of new unit. Make sure to replace gasket when installing new EGR valve.
Hi.
If you are getting an EGR Insufficient Flow Detected, the most common culprit is an EGR valve that is sticking open slightly. A heat sensor is fitted to the EGR, and this transmits the temeprature of the EGR to the ECU. Other causes can be a carboned-up EGR feed tube, or the transducer (the cvacuum valve thta activates the EGR). In my shop, when I see this code, I regularly replace all 3 units. We replace the EGR, the tube and the transducer.
SOURCE: insufficient air flow
there's a solenoid under the intake manifold which has vacuum hose connects to egr valve. this solenoid is having a lot of problem.
SOURCE: CE light is on ,i
You can replace the EGR or if possible clean it, but before check the AMF(air mass flow) sensor as well.
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