EGR problems on '87 Accord

Hi,

I have an '87 Accord DX with carb fuel. My problem is rough running and
lack of power after the engine warms and drops to normal idle RPM (about 700
rpm). It has poor power getting under way or climbing hills from this
point. The problem appears to be intermittant as well. When I remove the
vacuum hose from the EGR valve, the car runs and idles normally. I replaced
the EGR ($200!) and it didn't solve the problem. My manual says that the
EGR control valve A and B could be causing the EGR valve to operate when it
shouldn't. I have not been able to find these and guess they are in the ECU
on the firewall. Is this correct? I took the lid off and looked inside
the box and it looked pretty scary. Has anyone had a similar problem and
is there a drawing (or picture) of the A and B EGR control valves available?
I'm planning to go to a wrecker this weekend to see if I can find a used
box. Could a bad oxygen sensor cause this problem?

Thanks in advance.
Dean Carriveau

 

it's not the ECU.
And if the O2S were bad,it would not run "normally" with the EGR hose
disconnected.
maybe you have a cracked hose or a plugged hose?

Also pay attention to coolant levels in the radiator,not just looking at
the reservoir tank.The coolant temp sensor has to be immersed for it to
work right. there may be a air bleed port on your motor,that you open when
the engine is fully warmed up and bleed out any air.

Is there a diagram of the EGR system on the hood of your car?

 

is there a drawing (or picture) of the A and B EGR control valves available?
see Autozone repair guide

 

Changing the EGR doesn't do any good if the ports to the valve are blocked.
You only did half the job.