iFixit - Answers With Device "1988-1998 GMC Pickup"

1988-1998 GMC Pickup: Locate vacuum hose by transmission

Sun, 10 Aug 2025 15:30:42 -0700

Locate vacuum line to transmission

⟐ Commented August 10, 2025 at 15:30 MST

1988-1998 GMC Pickup: Looking for drain plug on radiator

Tue, 16 Feb 2021 15:31:04 -0700

Looking for drain plug for 98 sierra. Can someone help with the location, if there is one?

⟐ Commented February 16, 2021 at 15:31 MST

1988-1998 GMC Pickup: Where is the speed sensor?

Mon, 02 Oct 2023 21:16:54 -0700

My 1992 3/4 ton truck 4 wheel drive is throwing a code, 24 speed sensor failure, where do I find this sensor?

⟐ Commented October 02, 2023 at 21:16 MST

1988-1998 GMC Pickup: wiring problems with turn signals and running lights,.

Tue, 10 Dec 2019 10:36:40 -0700

I have a 1998 GMC Sonoma pickup that has been sitting for 1 1/2 years. left turn signal blinks rapidly while right TS is ok. If I put on running lights, both turn signals blink rapidly. and the taillights blink strange and then stop all together. The license plate lights were also blinking, I removed the bulbs and taillights still the same. inspected under the rear of the truck and found nothing disturbed. Changed electronic flasher and no changes. If running lights are off, right turn signals operate normally, but left side blinks rapidly. Suspect a ground problem, but ground on rear of frame look good and connected.

⟐ Answered December 10, 2019 at 10:36 MST

1988-1998 GMC Pickup: Transmission will only work in low & reverse?

Sat, 28 Jul 2018 14:10:16 -0700

88' gmc, 700r4 transmission won't shift from low to drive.fluid is good. Reverse works. Any ideas?

⟐ Answered July 28, 2018 at 14:10 MST

1988-1998 GMC Pickup: Misses like it's drawing moisture.

Sat, 05 Mar 2016 11:45:37 -0700

This is on a '97 GMC Sierra. I'll give it a complete tune up and in about three to four months it starts doing it again. I've been around and worked on vehicles most of my life and this has me puzzled. I have heard it could be anything from the computer to the coil or even a bare wire. I hate to keep changing everything every couple of months, and, besides, I can't afford it.

⟐ Answered March 05, 2016 at 11:45 MST

1988-1998 GMC Pickup: My oil filter busted

Thu, 05 Dec 2019 17:06:32 -0700

I started hearing this ticking noise in my engine and my truck died i looked under the truck and my oil shot from my oil filter to my gas tank.

⟐ Commented December 05, 2019 at 17:06 MST

1988-1998 GMC Pickup: Rear running lights do not work?

Mon, 02 Feb 2026 06:36:03 -0700

The rear running lights do not work on my 94 GMC Sierra . My turn signals and hazards are fine. and brake lights work when I hit pedal , but my tail lights that stay lit while driving do not work and I have changed the bulbs already and no fuse is blown. Any suggestions?

⟐ Commented February 02, 2026 at 6:36 MST

1988-1998 GMC Pickup: Changed steering column and now wont crank?

Fri, 19 Oct 2018 06:41:42 -0700

What are the electrical plugs at the base of the steering column?

⟐ Commented October 19, 2018 at 6:41 MST

1988-1998 GMC Pickup: 94 gmc 1500 Brake light wire cut at rear harness

Tue, 05 Sep 2023 14:46:40 -0700

I found the brake light wire and its cut just before the rear harness. But I can't find the other end(where it would connect to harness or another wire). All other lights work fine. I know it works with turn signal lights but how are they connected. Wire harness (by this I mean the 4 wire plug under rear of bed doesn't have a opening for the brake wire which is the 5th wire that runs along the chassis with the turn,back up,and running lights.please help before I set on fire.

⟐ Answered September 05, 2023 at 14:46 MST

1988-1998 GMC Pickup: will not turn over, got lights radio,etc

Sun, 16 Apr 2023 10:27:32 -0700

1992 gmc serria pickup turn key on got lights, etc. will not turn over

⟐ Commented April 16, 2023 at 10:27 MST

1988-1998 GMC Pickup: What makes the 700r4 tranny just start slipping and loosing all high g

Sat, 09 May 2026 00:16:28 -0700

Only reverse and first and half of second gear work and second gear catches and releases

⟐ Answered May 09, 2026 at 0:16 MST

1988-1998 GMC Pickup: Why dont my brake light/turn signals work on 1995 gmc sierra 1500?

Sun, 01 Feb 2026 10:47:50 -0700

My reverse lights, brake lightand turn signals do not work. Running lights do. My 3rd brake light(on the cab) does work though. Fuses are good, relay seems good, new tail light bulbs and circuit boards still no fix.

⟐ Commented February 01, 2026 at 10:47 MST

1988-1998 GMC Pickup: Why are my reverse lights not working

Tue, 16 Apr 2024 18:00:16 -0700

Both reverse lights are not working in my 1996 GMC sierra k1500 v6 4.3 5 speed manual transmission I've looked at the ground and reverse light switch still nothing help needed

⟐ Commented April 16, 2024 at 18:00 MST

1988-1998 GMC Pickup: Starter and more 92 Sierra 1500 rwd

Tue, 03 Oct 2023 06:43:38 -0700

Need to replace starter. How easy outs that? Is it necessary for a mechanic or easy enough for a dyi job? Also when i tried to crank it, behind the dash under the hood on the passenger side it smoked a little. What could that be?

⟐ Commented October 03, 2023 at 6:43 MST

1988-1998 GMC Pickup: Knocking sound in a 1996 5.7l vortec

Mon, 27 Jul 2020 15:17:42 -0700

I don’t have any problems out of the motor, when it’s cold, but when it warms up a knock starts and it goes from 40 pounds of oil pressure to when warm about 0-20 idling or moving and the more gas i give it the louder the knock is and it lowers the oil pressure.

⟐ Answered July 27, 2020 at 15:17 MST

1988-1998 GMC Pickup: How do I replace rear end?

Mon, 18 Mar 2019 16:13:55 -0700

Step by step instructions on how to replace 98 suburban, and what tools I will need..?..?...

⟐ Commented March 18, 2019 at 16:13 MST

1988-1998 GMC Pickup: Why are brakes dragging after vacuum booster change

Sat, 11 Feb 2017 21:35:53 -0700

Replaced vacuum booster and master cylinder, then bled the brakes. After about ten miles, the brakes start grabbing when no pedal is pushed.

⟐ Answer edited February 11, 2017 at 21:35 MST

1988-1998 GMC Pickup: Dead Battery that can’t be charged

Sun, 04 Jan 2026 08:16:28 -0700

Which battery to get for a 1998 gmc 6.5 diesel long box

⟐ Answered January 04, 2026 at 8:16 MST

1988-1998 GMC Pickup: Where are all ground wires?

Tue, 25 Nov 2025 00:20:16 -0700

Where are or should be all ground wires located? 94 GMC Sierra k1500

⟐ Answered November 25, 2025 at 0:20 MST