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Username Post: Sudden Flooding / GM 454 EFI        (Topic#346054)
K C 
Forum Newbie
Posts: 38

Age: 52
Loc: Thomson, IL
Reg: 02-28-10
07-16-17 04:16 PM - Post#2700272    

My 94 454 has suddenly started flooding. Heavily.
I've had no issues prior and has run great.
Today, I started and began driving at low speeds (35 mph or less) and noticed black sooty smoke coming from exhaust.
Under acceleration, engine seemed to stumble and heavier sooty black smoke from exhaust.
I stopped, let engine idle and light sooty black smoke came from exhaust and it got heavy when accelerated.
I shut off. A few moments (5 minutes of less) I started and this was difficult.
Held to floor and a lot of cranking before it would start.
Going down the road at 45-65 mph, seemed to smooth out but accelerate and still - black smoke.
I also noticed that at 65 mph, tranny would not go into overdrive and engine never got above 200 (normally runs at 220 year round).
I came home and took the breather off and it does seem to be dumping a lot of gas from the injectors.
Not sure which injector system this is but it has 2 injectors in a body that sets where the carb normally would.
I am not getting a check engine light.
Any ideas?

This is a 1993 P30 Chevy
454
4L80E
No mods on fuel system
Only mod on engine is headers added and air pumps removed.

Thanks
KC



Just a squirrell trying to get a nut
K C


 




Shepherd 
Contributor
Posts: 859

Loc: Lake George, NY
Reg: 11-11-15
07-16-17 06:51 PM - Post#2700291    
    In response to K C

Start with checking fuel pressure. Also the coolant temp sensor falsely reading cold temps even when warmed up is common on older Tbi engines.



 
K C 
Forum Newbie
Posts: 38

Age: 52
Loc: Thomson, IL
Reg: 02-28-10
07-18-17 02:59 AM - Post#2700432    
    In response to Shepherd

Thanks Shepard. I ordered a new sensor and fuel pressure gauge last night.
Will check it out when this arrives.

KC


Just a squirrell trying to get a nut
K C


 
K C 
Forum Newbie
Posts: 38

Age: 52
Loc: Thomson, IL
Reg: 02-28-10
07-21-17 02:27 PM - Post#2700836    
    In response to K C

OK, something seemingly simple has become complicated.

I have not checked the fuel pressure yet. Will do this evening.

The sensor - the one I bought is not correct. Too small for the threads and the terminal is different. It also has 2 pins. Mine is a single pin with a terminal that resembles 2 D's back-to-back.
Check the parts stores. Nothing. All 2 pin with a different terminal.
Called the dealer, 5 possibilities, but all are 2 pin as well.

Is there a single pin temp sensor out there somewhere, or has this been superseded by something?

Thanks
KC



Just a squirrell trying to get a nut
K C


 
K C 
Forum Newbie
Posts: 38

Age: 52
Loc: Thomson, IL
Reg: 02-28-10
07-22-17 06:17 PM - Post#2700987    
    In response to K C

I was working on the wrong sensor. I found the temp sensor at the front of the engine.
Replaced it. Running well now.

Thanks!
KC


Just a squirrell trying to get a nut
K C


 




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