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Username Post: 1990 c1500 need help        (Topic#286992)
Forum Newbie
Posts: 16

Loc: Tampa Florida
Reg: 09-14-12
09-14-12 12:34 PM - Post#2269645    

Hey I have a 1990 c1500 tbi everytime i start it up it runs for 2-3 minutes then the ses light comes on and the truck slowly dies out (lack of gas) so i replaced my oil switch thinkin maybe that it was shorted somewhere truck has 260k so prob need to replace it amyways but it still has the same problem and i unplugged my fuel relay and plugged it back in and it ran fine until the next day?? already tried to hook the scanner up to it won't read the ecu so i guess i should cross a and b in the aldl and try and read the ses light??? very confused and pissed replace dis rotor cap plugs wires still runnin like crap but when it does finally work which is rare it runs like a beast


Timothys Chevy 
Valued Contributor
Posts: 3867
Timothys Chevy
Loc: Fredericton, New Brunswic...
Reg: 09-24-03
01-19-13 10:13 AM - Post#2308724    
    In response to Jake_42022

Jumper terminals a and B, and watch the amount of times the engine light flashes.

It will pop a code 12 3 times, then it will show the codes after that.

Code 12 is one short flash, a brief pause, and 2 short flashes. it will take a long pause, and repeat this sequence 2 times. After that, the list of codes will start flashing. For example, a code 34 is 3 short flashes, a brief pause, then 4 short flashes.


1984 Chevy Citation 2.5
2009 Pontiac Vibe AWD
1993 Buick Park Avenue
2001 Pontiac Sunfire GTX

Brooke Bennett 
Forum Newbie
Posts: 2

Reg: 01-30-18
01-30-18 03:50 PM - Post#2722755    
    In response to Timothys Chevy

Try replace idle control valve, fuel filter, unplug o2 sensor, throttle control valve, and umm, temperature control sensor. I'm currently in the same boat, but love my old Chevy's and their Endless possibilities of elimination. Mine ran much better after replacing idle control valve. Still a little murmer of surging idle and also running rich. Gonna replace temperature control sensor and try unplugging o2 sensor. See if both or either fix my deliema. If not going to swap injectors. After that I have no clue

Edited by Brooke Bennett on 01-30-18 03:51 PM. Reason for edit: No reason given.

Frequent Contributor
Posts: 2062

Loc: Lake George, NY
Reg: 11-11-15
01-30-18 03:56 PM - Post#2722758    
    In response to Brooke Bennett

Welcome to CT, watch the dates on the threads, this 5 years old.


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