1991 Chevy 1500 4.3L TBIThe truck starts fine but looses power while driving up an incline within the first 10 minutes of driving.

Asked by Jul 15, 2013 at 09:47 AM about the 1991 Chevrolet C/K 1500 Scottsdale Extended Cab LB

Question type: Maintenance & Repair

The truck will do this a couple of times, then will drives fine for the rest of the day. It only does it when initially driven that day. We thought it was temperature related so we warmed the truck up for about 10 minutes then drove it. There was no change! It is possible that the current thermostat is opening too soon and engine temp is not coming up until under load. Not sure. Any suggestions are appreciated.

6 Answers

This one 2winSpin.....is going to be a "get your OBD scanned" There are just so many many possibilities that to eliminate so much guesswork, opps just saw 1991. Dangit. Well. you can still get some codes by the flashes and pattern of CEL. Do you know how to do that? Let me know if not and I will write out how.


check ign timing

Thank you guys. I do not know how to get the flashes you mentioned, your help is appreciated. Thanks!

Ground terminals A and B (see diagram below) with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.

1 of 1 people found this helpful.

After Code 12 is displayed, any stored trouble codes will be show . Then go to http://www.obd-codes.com/trouble_codes/gm/gm-2-digit-codes.php for a list of specifics

This is just a small sample of a very long list: code - code definition 12- diagnostic mode///// 13- 02 sensor or circuit////// 14- coolant sensor or circuit/ high temp indicated//////// 15- coolant sensor or circuit/ low temp indicated//////// 16- system voltage out of range ......BUT BEFORE we get carried away, let's keep it simple: Andrew up there has a good idea...listen to him, timing

1 of 1 people found this helpful.

Your Answer

C/K 1500

Looking for a Used C/K 1500 in your area?

CarGurus has 829 nationwide C/K 1500 listings starting at $3,000.


Chevrolet C/K 1500 Experts

  • #1
    Andrew Olsen
  • #2
    John Saffrahn
  • #3
View All

Related Models For Sale

Used GMC Sierra 1500
1,163 Great Deals out of 66,322 listings starting at $1,750
Used Ford F-150
2,936 Great Deals out of 215,786 listings starting at $1,295
Used Chevrolet C/K 2500
201 listings starting at $5,498
Used Chevrolet Camaro
475 Great Deals out of 31,744 listings starting at $1,450
Used Chevrolet C/K 3500
207 listings starting at $3,995

Used Cars For Sale

1998 Chevrolet C/K 1500 For Sale
150 listings starting at $3,000
1997 Chevrolet C/K 1500 For Sale
124 listings starting at $3,695
1996 Chevrolet C/K 1500 For Sale
84 listings starting at $7,988

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.