FAQ: EGR Port Cleaning - Engine Hesitation/Stumbling
#1
lots and lots of fail
Thread Starter
Join Date: Dec 1999
Location: Deeeeeeeeeeeeeeetroit
Posts: 23,004
Likes: 0
Received 1 Like
on
1 Post
FAQ: EGR Port Cleaning - Engine Hesitation/Stumbling
DESCRIPTION AND OPERATION
The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR vacuum control valve, EGR control solenoid valve, ECM/PCM and various sensors.
The ECM/PCM contains memories for ideal EGR valve lifts for varying operating conditions. The EGR valve lift sensor detects the amount of EGR valve lift and sends the information to the ECM/PCM. The ECM/PCM then compares it with the ideal EGR valve lift which is determined by signals sent from the other sensors. If there is any difference between the two, the ECM/PCM cuts current to the EGR control solenoid valve to reduce vacuum applied to the EGR valve.
SYMPTOM: An engine hesitation or stumble can be felt under light acceleration between 1,500 and 2,000 rpm.
PROBABLE CAUSE: Carbon build-up has restricted the EGR ports into the intake manifold runners.
CORRECTIVE ACTION: Clean the carbon out of the EGR ports.
Cars and Engines Applicable To - More will be added if found. Please add your own if you have a good how-to on it.
90-93 Honda Accord F22
98-02 Honda Accord J30A1
The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR vacuum control valve, EGR control solenoid valve, ECM/PCM and various sensors.
The ECM/PCM contains memories for ideal EGR valve lifts for varying operating conditions. The EGR valve lift sensor detects the amount of EGR valve lift and sends the information to the ECM/PCM. The ECM/PCM then compares it with the ideal EGR valve lift which is determined by signals sent from the other sensors. If there is any difference between the two, the ECM/PCM cuts current to the EGR control solenoid valve to reduce vacuum applied to the EGR valve.
SYMPTOM: An engine hesitation or stumble can be felt under light acceleration between 1,500 and 2,000 rpm.
PROBABLE CAUSE: Carbon build-up has restricted the EGR ports into the intake manifold runners.
CORRECTIVE ACTION: Clean the carbon out of the EGR ports.
Cars and Engines Applicable To - More will be added if found. Please add your own if you have a good how-to on it.
90-93 Honda Accord F22
98-02 Honda Accord J30A1
Last edited by 98CoupeV6; 03-10-2006 at 05:34 AM.
#3
I think I'm going to try the diagnostic procedure outlined in the Honda TSB first but here are two more sites with other explanations of the EGR port cleaning procedure. Please post what your results were.
From about.com
Tech2Tech TSB (has photos)
-g
From about.com
Tech2Tech TSB (has photos)
-g
#5
lots and lots of fail
Thread Starter
Join Date: Dec 1999
Location: Deeeeeeeeeeeeeeetroit
Posts: 23,004
Likes: 0
Received 1 Like
on
1 Post
Originally Posted by S4gunn
I think I'm going to try the diagnostic procedure outlined in the Honda TSB first but here are two more sites with other explanations of the EGR port cleaning procedure. Please post what your results were.
From about.com
Tech2Tech TSB (has photos)
-g
From about.com
Tech2Tech TSB (has photos)
-g
#6
egr port cleaning for 3rd gen (86-89) accord?
I am a newbie here.
I am usually on www.3geez.com
does anybody have a "how to" on cleaning the egr port on a
3rd gen accord lxi?
I am usually on www.3geez.com
does anybody have a "how to" on cleaning the egr port on a
3rd gen accord lxi?
#7
EGR Port Cleaning
I have cleaned the port successfully without removing the throttle body.
I got the EGR flow message when OBD 'd. I will post some pictures later as a rough tutorial so you dont have to be porked by the dealer. Very easy job. and my car drives better than when I bought it.
Accord V6 '99 3.0L 114,000mi
I got the EGR flow message when OBD 'd. I will post some pictures later as a rough tutorial so you dont have to be porked by the dealer. Very easy job. and my car drives better than when I bought it.
Accord V6 '99 3.0L 114,000mi
Last edited by accord99v6; 08-24-2006 at 05:56 AM. Reason: add car
#8
lots and lots of fail
Thread Starter
Join Date: Dec 1999
Location: Deeeeeeeeeeeeeeetroit
Posts: 23,004
Likes: 0
Received 1 Like
on
1 Post
I have cleaned the port successfully without removing the throttle body.
I got the EGR flow message when OBD 'd. I will post some pictures later as a rough tutorial so you dont have to be porked by the dealer. Very easy job. and my car drives better than when I bought it.
Accord V6 '99 3.0L 114,000mi
I got the EGR flow message when OBD 'd. I will post some pictures later as a rough tutorial so you dont have to be porked by the dealer. Very easy job. and my car drives better than when I bought it.
Accord V6 '99 3.0L 114,000mi