GMC Sierra 1500 Questions Maintenance & Repair

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What Is Causing My Gmc To Advance The Timing About 25° When I Plug The Wire...

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...


How To Correct Extreme Idle Speed On 1987 Gmc R1500 With Hei And 5.0l Engin...

Been doing this for over 35 years, never had this problem before. Got truck cheap, No maintain history. Idles about 2000rpm. Have check for vacuum leaks, stalls when air is blocked. Base timing correc...

23 views with 5 answers (last answer 13 hours ago)

Both Brake Lights Dont Work And Left Running Light Doesnt Work On New Led T...

I just purchased LED tail lgihts for my 2001 GMC sIERRA 1500 but my left running light and both brake lights do not work. Any ideas?


My 1992 Gmc Sierra Will Start But Will Only Run For 20 Seconds Exactly.

My 1992 GMC Sierra will start but will only run for 20 seconds exactly. Change fuel pump, fuel relay, tested computer. Swapped computers, Replaced Cap and it still runs for only 20 seconds.

12 views with 1 answer (last answer about a week ago)

My Truck Seems To Have A Delay/ Loss Of Power When Accelerating. It Has 60k...

2010 GMC Sierra 4WD, 2nd owner, bought at 50K

45 views with 8 answers (last answer about a week ago)

So I Have 2 Questions. 2 Problems. I Have A 2005 Gmc Sierra. 4 Door/2wd. 5....

Problem 1) when I go to leave and shift into reverse sometimes it won't go. It acts like it's in neutral. I put it back in park then to reverse and we're good to go. Problem 2) the other day I wa...

6 views with 1 answer (last answer about a week ago)

2009 6.2l Denali Hesitation

My PU has a slight hesitation when starting out from a stop. We just had the throttle body and air flow sensor replaced about 2 months ago new air filter, injector cleaner. No codes. 90000km, runs syn...


I Have A 4l60e Out Of A 1994 Will It Fit My 2009

GMC has a bad transmission will my one out of the 1994 work

5 views with 1 answer (last answer 2 weeks ago)

Replacement Bulbs

Where can i find what bulbs(and how many of each bulb) if i want to replace all my bulbs? 1992 make.

9 views with 1 answer (last answer 2 weeks ago)

Stuttered Start Up

Sometimes on stat up and take off my truck has a stuttered start and slow acceleration. The service light is not on I have cleaned the maf and replaced spark plugs. Also have a new fuel filter.

11 views with 1 answer (last answer 2 weeks ago)

My Break Lights Are Not Working When I Push The Peddle Down And My Left Tur...

Before I changed my break light switch I would here a click when I would barely press on the break and the break lights would work until I pushed them all the way down to stop now that I changed ...

9 views with 3 answers (last answer 2 weeks ago)

Why Does My 1994 Gmc Seirra Bog

I have been driving the truck with no worries. My truck bogs when it takes off. I lightly tap on the gas and it sputters and acts like it wars to stall but IT doesnt. Only when I'm taking off fro...

12 views with 3 answers (last answer 2 weeks ago)
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