Testing EGR Valve
#1
Testing EGR Valve
Hello all,
1993 2.2, did not pass smog for High NOx, tech says could be EGR. The car has 213K and have never done any maint on the EGR in terms of cleaning ports or replace EGR valve.
Question: I put a hand vac pump on the EGR port and try to hold vac at 10 in.HG to see if the diaphragm will actuate but nothing. Wont hold Vac.
Does this indicate torn diaphragm and the EGR needs to be replaced, or will a good cleaning of the EGR valve body itself maybe fix it to working condition.
thx
bw
1993 2.2, did not pass smog for High NOx, tech says could be EGR. The car has 213K and have never done any maint on the EGR in terms of cleaning ports or replace EGR valve.
Question: I put a hand vac pump on the EGR port and try to hold vac at 10 in.HG to see if the diaphragm will actuate but nothing. Wont hold Vac.
Does this indicate torn diaphragm and the EGR needs to be replaced, or will a good cleaning of the EGR valve body itself maybe fix it to working condition.
thx
bw
#2
You can pull the valve off and check the ports, if the ports are clear and the valve pintle lifts when you apply vacuum, then you have a control issue...this system has a lift position sensor and a solenoid valve controlling it.
#3
Thx, pulled the EGR, when apply vac the valve pintle lifts and then retracts right away. Is this normal? There is a lot of soot that I will clean out but it seems to move freely. Can the sensor be checked? or replaced separately. It appears that the only way to change the sensor is to buy a new Valve. When you say control issue, dose this mean that if the ports, runners are clogged then this contributing to the problem?
thx
Bw
thx
Bw
#4
if you apply vacuum and the valve lifts and then loses vacuum and drops right away, the valve is bad. clean the ports while you're at it as well.
by control, i'm referring to the ecm, but your valve is bad, so it needs to be addressed first anyway.
by control, i'm referring to the ecm, but your valve is bad, so it needs to be addressed first anyway.
#9
Thanks for the response.
This is what I have done so far:
1. Removed EGR valve and cleaned toughly, the valve pintle move freely and looks good.
2. Cleaned all EGR ports with recommended cleaner and runners with small nylon bottle brushes all clear.
3. Reinstalled EGR with new gasket and put everything back together.
4. Started engine warm-up and then removed vac line #16 to the EGR Engine does not stall or run rough
6. Apply Vac at the EGR with hand pump but EGR won’t hold Vac.
If I pump the hand pump quickly in repetition I can get the engine to stall so I know the EGR ports are clear and EGR valve is moving to some degree.
Does this all point to a bad EGR valve? According to the flow chart troubleshooter it does.
Thx Bw
This is what I have done so far:
1. Removed EGR valve and cleaned toughly, the valve pintle move freely and looks good.
2. Cleaned all EGR ports with recommended cleaner and runners with small nylon bottle brushes all clear.
3. Reinstalled EGR with new gasket and put everything back together.
4. Started engine warm-up and then removed vac line #16 to the EGR Engine does not stall or run rough
6. Apply Vac at the EGR with hand pump but EGR won’t hold Vac.
If I pump the hand pump quickly in repetition I can get the engine to stall so I know the EGR ports are clear and EGR valve is moving to some degree.
Does this all point to a bad EGR valve? According to the flow chart troubleshooter it does.
Thx Bw
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