1990 Chevy 1500 NO START

TAKER442

MEMBER
1990 CHEVROLET TRUCK

I have a 90 chevy Scottsdale 1500. 130000 miles
It is running a 350 with throttle body injection.
One day just quit. Brought it home and it started, lot of black smoke. Found 2 codes on the computer, O2 sensor (found broke) and temp switch (below -27 for 30 seconds at start-up).
Changed the 02 sensor, gave a complete tune-up.(Plugs, wires, cap, rotor, fuel filter, air filter) Has never had a tune up since I have owned it, so it was due.
Tried to start, would not start. Thought may need some gas to prime the fuel filter(?) Put some into the throttle body after a few tries it started.
Pulled it out of the barn and let it warm up.
Turned it off. Would not restart. After a few times it finally started. RUN GREAT. Took it for a ride, got down the street and it died again. Restarted it would only run full throttle with no RPM's. After about 3 or 4 minutes of running that way I let it stall out. Got out of the truck and found the muffler RED hot (glowing).
Thught it to be a pluged cat. Converter. Cut the cat. Out. No change can not restart at all. It has good spark, fuel comming thru the injectors and cranks fine.
The only code is 15 (temp below -27 degrees for more than 30 seconds)
I do not know how to reset that code.
Any help would be great.

Thank you

Todd

6 Replies

INDYUKE

MECHANIC
416 POSTS

You can reset the vehicle's computer. And by extension erase the code. By disconnecting the battery for at least ten minutes. Disconnect the battery only while the vehicle is off.

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Thursday, February 8th, 2007 AT 5:25 PM

FARQUI

MEMBER
3 POSTS

Start by replacing your coolant temp sensor. With a reading of -27, your ECM will dump lots of fuel. This will result in hard or no starts and fill your exhaust with raw fuel. This is probably making your eahaust red hot. Also, check your engine oil, it may be contaminated with fuel as well. It is a good idea to change it anyway.
To clear your code after the repair, use a scan tool, or remove the " POSITIVE " battery cable for at least 10 seconds. You will have to drive the vehicle for about 20 minutes to reset all peramiters.
Good luck
FARQUI.