What else could cause my 94 chev 5.7 to run really rich and not run?
20

Asked by 69Pontiac Jan 07, 2021 at 02:08 PM about the 1994 Chevrolet C/K 1500 Silverado RWD

Question type: Maintenance & Repair

I have a 94 chev PU 5.7 TBI.
Seems to be full fuelling.Black smoke like crazy no power barely got home ,now no start.
Replaced pressure regulator ,coolant temp sensor,Map sensor,O2,
fuel filter ,removed and checked 1yr old EGR it was ok,removed and checked IAC all clean and working. Engine is 1 yr old professionally  rebuilt ,No vacuum leaks,only code was 45, rich o2 LOL. Ignition spark excellent at coil and plugs, new rotor.Cap,coil and electronic module 1 year ago.
Great spray pattern from injectors ,plugs black and almost sounds like it wants to start with the injectors unplugged.Plug them in and no hint of start.
AgM battery on charger so I have good voltage.Yes I removed the ecm and it looks brand new.
Any help would be greatly appreciated as its my work truck and the shops are busy until 1-3 weeks .Thanks

1 Answer

Nolan answered 3 years ago

Try unhooking your battery completely from the truck and turn the key a few times, and let sit like that for 30 minutes or so. This will reset your computer. Make sure battery and connections are good and put back in and start it. Seems very simple and doesn't sound like it would do anything but I've had this save me before and its always worth a shot. This will probably not fix the black smoke though

Mark helpful

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