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1990 Chevy 1500 pick-up NO START
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taker442
New User
Feb 8, 2007, 1:18 PM
Post #1 of 4
(10553 views)
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1990 Chevy 1500 pick-up NO START
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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).
Thought it to be a plugged cat. converter. Cut the cat. out. No change can not restart at all. It has good spark, fuel coming 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
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steve01832
Veteran
Feb 16, 2007, 4:24 AM
Post #2 of 4
(10538 views)
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Re: 1990 Chevy 1500 pick-up NO START
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If the coolant temp sensor is telling the PCM that the coolant temp is -15 then the computer will dump the fuel when you try to start the car. The muffler was glowing red due to secondary combustion. The excessive fuel was being burned in the exhaust system causing it to overheat and glow. You need to repair the ECT circuit to fix this. Either the ECT sensor is out of range or you may have a short to ground in the wiring. In some cases it could be a faulty computer. Start there and make sure the cooling system is full. You can start by unplugging the electrical connector at the ECT sensor and start the truck. If it starts and runs replace the ECT sensor. You will have to clear the code to make the MIL turn off.
Steve
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taker442
New User
Feb 16, 2007, 6:42 AM
Post #3 of 4
(10537 views)
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Re: 1990 Chevy 1500 pick-up NO START
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Never thought the temp sensor could do that.
Between the o2 senso and the temp sensor it did just that.
It is running great now.
THANK YOU
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steve01832
Veteran
Feb 17, 2007, 3:37 AM
Post #4 of 4
(10527 views)
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Re: 1990 Chevy 1500 pick-up NO START
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My pleasure.
Steve
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