You cleaned th EGR valve but are you sure it's working right. With the engine cold, start it, let it warm up a minute or so, touch the valve, it should not be hot. You can also test it with a hand operated vacuum pump.
Disconnect the wiring harness to the air bypass valve on the throttle body. Disconnect the vacuum hose to the EGR valve and plug it. Connect a hand operated vacuum pump to the EGR valve. With the engine idling at normal idle RPM, it's on the sticker under the hood, you may have to open the throttle slightly with the air bypass disconnected, apply 5-10 inches of vacuum to the EGR valve. The idle should drop more than 100rpm and may even stall. When you remove the vacuum, the idle should return to normal. That means the EGR is OK. If not replace.
Are your spark plugs fouling? Are you getting sufficent spark to them? Is your timing correct?
Also check the O2 sensor. Connect a digital voltmeter black lead to a good ground and back probe the O2 sensor wire connector with a paper clip and connect the voltmeter positive lead to it. With the engine warmed up and running, the voltmeter should swing rapidly between.01 and 1.1 volts dc. That would mean the O2 sensor is most likely OK.
Is the check engine light coming on. If it is you should get the codes read. You can buy a fairly cheap code reader for about $30 for your vehicle.
Tuesday, May 29th, 2007 AT 10:39 PM