|Originally posted by fierofool:|
Your problem is probably with the EGR solenoid. If the EGR valve was connected, the EGR tube isn't leaking, the vacuum line from the solenoid to the EGR isn't cracked, and the light still came on with everything connected, take a look at the solenoid. A common failure is the little hose that loops from the vacuum to the electro part of the solenoid. The rubber sleeve tends to rot and leak. Replace the line with a small vinyl hose.
Your EGR valve is an aftermarket valve. The nipples are oriented to mount to later model vehicles that used the same base. Some EGR tops can be rotated to make a better OEM style connection for the vacuum line. EGR will set a code 32 and cause the light to come on then go out, but only at highway speeds. Be sure to check all trouble codes, then clear them by disconnecting the small barrel connector near the battery for about 30 seconds. This will save radio presets but clear the ECM.
Thanks, so you would mean that there must be a vacuum leak elseware ("little hose that loops") and that is why there is little difference hooked up vs. not?
What difference should be expected if there were no leaks?
[This message has been edited by 2.5 (edited 06-02-2014).]