No idea about the thumping, but it sounds to me like its your egr, but i could be wrong!

Hopefully somebody else will chime in.

 

Thanks for all the help guys! Anyone else ideas or do you all think I just need to go get a new EGR? Also if the Egr is bad will it cause the engine to PING?

 

did yo9u use a timing light with the ecu shorted? you need base timing to time her out or it would be all over the place

 

yep, sounds like you need a new egr valve. and to answer your question, yes it can cause the engine to ping. Egr feeds unburnt exhaust gases back into your engine. the extra fuel has a bit of a cooling affect on combustion if I remember correctly. It also has riching effect which helps cool combustion. Without it, things heat up and cause the ping. Put a new valve on and I bet it will go away.

 

If you just applied direct vacuum to your EGR and the engine did not stall then your EGR is stuck. Open, closed, whatever... it should have stalled @ idle with full vacuum applied directly to the EGR valve. The only other possibility is that the VSV (vacuum switching valve) that the computer uses to control when the EGR is open is no good. These valves are a common problem - especially in the evap system. Also you mention that it's just a code, which I take to mean there is no drivability concerns?

It's possible that the EGR is causing a lean run condition, causing a ping. Buy and install a new EGR first, then diagnose any continuing problems.

 

yes sir I used the timming jumper

 

yeah the truck pings

 

emissions test stated that the truck is running rich

 

Not to get off topic but you wouldn't pass inspection without having a cat would you?

 

yeah true! Im putting a new cat on soon! But I think if the egr isent working that it wouldent pass emissions either

 

most of the time yes. However, I had a teacher in high school that had a 4cyl. jeep that passed emissions with the EGR not working and a hollow cat. I don't know how he passed but it did.

 

Lots of Honda's can pass with hollowed out cats too. And they don't have EGRs, period.

Get that cat replaced and EGR installed, see how you do. The 3 major emissions components are Cat, EGR and 02 sensors. You need 2 of the 3 fixed.

 

so how come my truck dident pass emissions? Could it be o2 sensors or injectors?

 

egr or cat.. my 4runner wouldnt pass without a cat

 

anyone else have this problem?