1993 Chevy S-10 Blazer 4.3 CPI Black smoke SOLVED

PAULB

MEMBER
1993 CHEVROLET TRUCK

I have the above mention truck and I am not sure what is exactly wrong with it. It's hard to start(have to press pedal down to get it to start), rough idle when stopped, oil pressure drops to near zero when the rough idle starts, has black carbon and smoke coming from the tailpipe on start up and 3/4 throttle and it is using ALOT of fuel(only getting around 10 mpg).I replaced all of the ignition parts, pcv and the fuel filter. Getting a trouble code 45 (rich mixture).I was leaning toward the fuel pressure regulator because of a question someone else asked with a similar problem for the same vehicle but today I noticed someone in the forum with a 1992 blazer with a somewhat similar problem found out it was the computer. What do you all think it may be?

1 Reply

PAULB

MEMBER
16 POSTS

Well I figured this one out on my own so all you owners of these motors with the same symtoms, here is your answer.I pulled the upper intake plenum off and had my wife turn the key on(do not start). Upon doing so I noticed alot of fuel spraying from the incoming plastic fuel line. After unhooking the battery again, I took the clamp off that was holding the 2 fuel lines together where they go into the spider assembly, pulled both lines out. They are pressed into the spider assembly. Then I undid the 2 metal fuel lines outside of the intake(16mm nut).I moved them out of the way and removed the plate that holds the 2 fuel fitting in place. It is a star bit head on this screw. Using a long skinny screwdriver and hammer I put the tip of the screwdriver against the back of metal fuel fitting and knocked it out of the intake. It has to go toward the firewall to remove.I did this for both incoming and return fuel line fittings. This is a dealer item at a cost of $100. But if you don't have the money to spare do what I did.I bought rubber fuel line from the parts store along with clamps for around $5.00 and used a razor blade to cut the old plastic fuel line off the fittings.I reinstalled the fitting into the manifold and slid the rubber hose onto the end and clamped it on. The I slid the hose onto the plastic fitting that goes into the spider assembly and clamped it. Make sure you put your clamps toward the end of this fitting so you can reinstall the clamp that holds these 2 lines together. Make sure you recheck for leaks before reinstalling the upper intake plenum. Hope this helps everyone having the same symptoms.