What is causing my GMC to advance the timing about 25° when I plug the wire under the dash together?

5

Asked by Apr 28, 2015 at 07:25 AM about the 1995 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

I disconnected the tan/black wire before setting the timing. I set the timing to 0°. Shut it
down, connect the wire back, and when I check the timing, it advances about 20°. If I
disconnect the wire again, it goes back to 0°. Thanks for any help in advance!

1 Answer

10

when you set the timing to zero you are setting it at a starting point for the computer. Connecting the wire now allows the computer to manage the timing for optimum performance at all times

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • When I hit my brakes they come on but my running, or parking lights, also come on? 2 answers

    Its a 1983 gmc high sierra k1500.

    GMC Sierra 1500

    -

    Maintenance & Repair

  • Need to find 1995 GMC Sierra 1500 5.7L V8 O2 sensor wire 11 answers

    I am doing work on my 1995 GMC Sierra 5.7L V8 I recently purchased. It is idling very rough and stalls when put into gear. When looking through the engine bay, I discovered that the O2 sensor wire wa...

    1995 GMC Sierra 1500 K1500 SL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • rough idle, stalling, loss of power. 225 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB

    -

    Maintenance & Repair

  • Problem with ground wire from fuel pump connection to truck frame 18 answers

    I changed the fuel pump on my 1996 GMC Sierra earlier in the year. I cut through my truck bed right above the fuel pump so I would have easier access to it. For the most part my truck has been fine b...

    1996 GMC Sierra 1500

    -

    Maintenance & Repair

  • I have a 1990 GMC K1500, stalling issues. 29 answers

    the truck will start up most time fine with a little gas, after about 30 seconds in idle it will do an irregular idle and then stall out. Also when I put the truck into reverse or drive without my fo...

    1990 GMC Sierra C/K 1500

    -

    Maintenance & Repair

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,610
#2 John Saffrahn
John Saffrahn
Reputation 3,230
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,890
View All

Related Models For Sale

Used Ford F-150
3,213 Great Deals out of 205,088 listings starting at $1,779
Used Dodge Ram 1500
528 Great Deals out of 13,261 listings starting at $1,800
Used Toyota Tacoma
710 Great Deals out of 32,122 listings starting at $2,000
Used GMC Yukon
564 Great Deals out of 16,646 listings starting at $2,500
Used Chevrolet Tahoe
852 Great Deals out of 28,369 listings starting at $1,700
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used GMC Sierra 2500
189 listings starting at $7,500

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
14 Great Deals out of 30,726 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
59 Great Deals out of 4,847 listings starting at $20,990
2015 GMC Sierra 1500 For Sale
172 Great Deals out of 4,393 listings starting at $16,489
2014 GMC Sierra 1500 For Sale
180 Great Deals out of 4,461 listings starting at $13,000
2013 GMC Sierra 1500 For Sale
113 Great Deals out of 2,537 listings starting at $9,988