Hello all. I'm working on an old lady's van which has trouble staying running. Blows black **** out of the tail pipe on initial start. So much that you can see it sprayed across the sidewalk. Run very rough. She can drive it, but she has to keep pressing on the gas. Difficult to start, takes a while. Eventually runs for a few seconds before cutting off. I asked if it surged and she told me no. I checked out the vacuum lines and replaced a few broken lines. Still runs rough and cuts off. I have yet to spray any carb cleaner to find the leaks. Its old. I'm sure it needs a new PCV as well as an EGR valve

Here are some photos. Any help or guidance would be appreciated. Thanks in advance.

 

I'm going to say stuck float in the carb. Or choke plate stuck partially closed. From the photos, it looks like the carb could use a good cleaning and a kit.

jim

 

Thank you Jim. I'll look into how to do those things. I appreciate your guidance. What about the EGR valve? I read I could clean it. How would I check if its operational?

 

And just to be clear, Manifold Absolute Pressure is only for FI cars and trucks, am I correct? Their symptoms seem to be spot on with what I have. Black smoke, bad idle, and stall.

 

Hi Balto,

I don't think EGR would cause your problems. If it is stuck closed, no problem starting, if it is open it probably wouldn't start at all.

jim

 

what isFI I HAVE same van and condition

 

Fuel Injected.

 

Replaced plugs, wires, coil, pcv, and busted vaccum lines. Runs a lot better under load. Still has a lobing idle, and stall. Also black sut being sprays on the sidewalk when started. Would the TFI cause this issue?

Also cleaned out the egr valve, and tried to take the caked up carbon out of the manifold that the EGR sits in.

 

Is there an idle air control valve for this truck?