I know this problem has been hashed and rehashed but I can't seem to find the info I'm looking for. I've got a 98 Frontier w/ 193K 2.4 4 cyl. I was getting a missfire on I believe #4, a cat converter error, and a EGR error. I changed the plugs to uridium and ran 2 bottles of Sea Foam through the gas tank and I'm down to the EGR code. I did the test with the diaphram and when I push it up it runs really bad stalling if I push hard enough. Its got some resistance to it. I'm not sure how freely it should move. What I've found is that its most likely plugged passeges that I need to clean out or atleast thats where I should start. My question is what passages do I need to clean out? There's a short rubber hose that goes to the part next to it.( EGR backpressure transducer maybe) Then there the metal pipe maybe 1/2' that looks like it goes to the exhaust manifold, then there's a maybe 1/4' pipe that goes into the bottom of the EGR backpressure transducer. I'm assuming the exhust manifold pipe is the one that needs to be removed and cleaned. The fittings look really rusted and should be a huge pain so thats got to be it. What should I use to clean it? A metal pipe cleaner and some type of solovent? Does anyone know of a step by step right up with the proper wrench sizes. Maybe I'll just be better of ordering a new pipe and fittings since these look so bad.
Thanks for the help.
Thanks for the help.