Leaking TBI Injector??

95 K2500 with a 351 TBI. After the truck has been run and is hot, if you stop for a while - 15-30 minutes - and then get back in and try to start, it
starts hard. Black smoke out the tailpipe. Rich?? Leaking Fuel Injector? It has 90K miles on the original injectors.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Most likely a ruptured fuel pressure diaphram.
Cheers

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Whats that Doc.
HDS
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Coolant Temperature Sensor, tells the computer how hot <or cold> the motor is and adjusts air/fuel mixture accordingly. If it's nearing the end of it's life (or completely shot), it defualts to -40F which runs a super rich mixture and can cause the black smoke. It's located right next to the waterneck on the intake, will have two wires (usually yellow and black).
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Isn't that supposed to cause a constant rich setting though?
-The Lonely Grease Monkey 1985' K5 305CUI TH700R4 NP208 KJ's successor
"Ignorance is preferable to error; and he is less remote from the truth who believes nothing, then he who believes what is a wrong." - Thomas Jefferson
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Yes it is, that's exactly what I said.
Doc

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Sounded like it was an intermittent smoke problem... and a CTS would cause constant black smoke, or close to constant....
~KJ~

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Makes sense. Thank you much for the lesson!
~TLGM
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Some advice if you replace the FP regulator:
don't just buy the repair kit. Buy the whole darn thing. The spring inside the regulator likes to break into multiple pieces, and it doesn't come in the repair kit. You will invariably find this out at 9pm on a Sunday evening. Without that intact spring, the reg can not work properly
Ask me how I know. ;)

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I have checked the CTS and it is OK. I replaced the fuel pressure regulator as well, and checked it. It's OK. Hence my thought on the leaky injector . . .

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.