94toy4x4fever

I know that code 71 is something to do with the EGR! So were do you guys think is the best palces to start trying to find out what the problem is!

904_runner

Start by seeing if the egr valve is working. You can pull off a vacuum line and replace it with the one at the top of the egr and see if it will open.

94toy4x4fever

well I tryed that, I pulled a vaccum line off of the intake. Thats right, right! Pull a line off that has suckion right? I did do that and it did not stall out/ sputter. Does that mean I need a new EGR valve? I know all my vaccum lines are hooked up right! I went over the diagram a few times! I just want to make 100% sure it is the EGR valve before I go and spend like 180 bones on it!

ozziesironmanoffroad

a neighbor mechanic told me today if its throwing a EGR code, and its not fixed, the computer will screw with the mixture and fry the fuel injectors and clog up the cat. converter... i doubt this is true, but maybe you might want to look into it... i sure am...

94toy4x4fever

yeah got ya! I dont have a cat on the truck (yeah i know there will be some guys give me crap for that) and also the truck is running rich! Im going to buy new injectors soon!

904_runner

Sounds like the EGR is bad.

94toy4x4fever

Anyone else have any ideas? Thanks to everyone that has helped

anotherjeff

If it does not stumble/stall when vacuum is applied (Use your mouth!) to the EGR valve, then it's NOT functioning. This is the same test that's required for smog check (except the techs have nifty MityMite pumps).

Non-functioning EGR valves can be caused several things, with "clogged passages" being high on the list. Running "rich", huh?

94toy4x4fever

yeah had it smoged for warrenty on my engine and they told me it is running rich

abecedarian

running rich (high hydrocarbon emissions/ HC) does not mean that the EGR is bad. running rich at 'cruise' RPM's points a tad towards the EGR but doesn't mean much either though.
Now on the other hand, high NOx readings at cruise would point to the EGR.

Team420

If you dont have a cat on the truck...why worry about the egr...just bypass it and call it good, you already fail emmisions tests due to the lack of a cat, or at least in the state of maine you do.

94toy4x4fever

yes had high Nox reading at cruise! So EGR. Cuz Im about to go out the door and get a new one!

js9924

I second this. There is no point in picking and choosing which emissions equipment you want. Also dont forget to check the filter in the modulator before the EGR. Shove a 10 k resistor in the connector for the temp sensor and the code will disappear. click on the link in my sig and you will find a write-up under the projects section.

94toy4x4fever

ok I dident get a egr because the parts house dident have the gasket for it so I will wait! I looked at the egr mod filter and it looks nice and clean! Im just trying to ge tto the bottem of this stuff. Truck runs good and has good power it just pings a little and throws a check engine light after driving in the highway for a while!

trbizwiz

Nice write up on the EGR. Do you think the same resistor would work for the O2 sensor on the exhaust. Well I guess I better not try that on second thought because the O2 messes with the timing. never mind. But nice write up on the EGR.