Egr Problems

[charles]

Since a few months I have some irritating engine problems. I replaced the defective MAF, that improved the drivability strongly, but that did not solve the sudden cutting out - jumping at the mid speed range. As the dealer could not diagnose anything I had to solve it by myselves (also to save on expensive labour)

 

I found some very good information on the site www.fordscorpio.co.uk. This car has the same 2.3 engine as the galaxy, and has excellent fault finding info.

 

The EGR system is a very sensitive and complex thing and can cause severe drivabilityl problems when not operating.

 

I disconnected the hose on the EGR valve and the problems were gone. Thus it had to be the EGR system, however you no never know sure, because the ECM can detect that and fall back in other safe program.

I removed the EGR valve. This valve was heavenly coaled. I cleaned it with carb. cleaner and checked the operation, seemed to be fine.

This did not solve the problem. Now I think I found the problem, the Pressure Diffential sensor. This sensor measures the flow in the EGR pipe from exhaust to EGR valve. If this sensor gives no or minimal signal, the ECM thinks that there is no flow to the EGR valve. Than the ECM opens the EGR valve to much, distroying the combusion and cutting out the engine.

 

When I pulled the rubber hose the sensor it looked badly polluted. I do not think I can clean it. I will buy a replacing part.