Question about 1989 GMC Sierra

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What sensors does an 89 gmc sierra 350 have that effects idol and fuel?

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  • 13 Answers

Oxygen sensor on exhaust. Mass airflow sensor. Air/ idle control sensor. Throttle position sensor

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: 2007 gmc sierra 2500 IAT sensor

Well, the IAT (Intake Air Temperature) sensor is located on the air intake duct between the filter and the throttle body (Assuming you have the 6L motor). The wires are easily visible at the plug that connects the sensor to the wiring harness. That's the easiest place to access them.

Posted on May 18, 2008

  • 147 Answers

SOURCE: what transmission will fit in an 89 gmc sierra?

if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

Posted on Nov 20, 2008

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SOURCE: fuel pump fuse located on 1997 gmc sierra

The fuse is actually a Relay Switch and its located in the Fuse Relay Center on the driverside of the engine compartment. The Black Box is labled Fuse Relay Center, the diagram on the cap displays which Relay is the Fuel Pump relay...the Relay switch is usually $8-$15 depending on where you shop

Posted on Jul 28, 2009

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SOURCE: 98 gmc sierra sputters and clacks when first accelerating

I wouldn't think it to be a fuel delivery problem anymore.If you could get someone to scan it while the problem occurs maybe you could see if your TPS is dropping out due to a faulty sensor or connector,also you could check for a blocked cat convertor by hooking up a vacuum gauge to the engine or a pressure gauge to the exhaust at 1500rpms should be no more than 1 to 1 1/2 pounds back pressure. Also you could check your magnetic pole piece that is under the rotor in your distributor they are known for the magnet cracking at the rivets.

Posted on Aug 31, 2009

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SOURCE: where do i find a knock sensor a 1993 gmc sierra

Should be on the right side of the engine by the starter.Has a 1 wire connector.It does not go into the cooling system so you can just take it out without draining the coolant.Hope this helps.Good luck.

Posted on Jan 06, 2010

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2 Answers

Where is the headlight relay on a 1989 gmc Sierra c1500 stepside 350 5.7L v8


No relay.
Headlights are powered directly from the headlight switch.

Nov 30, 2015 | GMC Cars & Trucks

1 Answer

My 89 gmc sierra surges when idoling on in drive i dont know where to start....


You need to start by going to autozone n get a free diag ck tell me what codes came out a lot of thinks can do that tps sensor low fuel pressure dirty trottle bode dirty fuel filter or any other senso map mass air flow I need the codes then I can help u good luck

Oct 03, 2015 | GMC Cars & Trucks

1 Answer

What causes a 89 4x4 gmc Sierra to t bog down when your cranking it up and driving at low speeds


Maybe to much fuel. Does your coolant gauge work or register? Could be the ECT sensor. Could be fouled plugs also. Do you have smoke coming out the back? is it black smoke?

Jun 06, 2015 | 1989 GMC Sierra

2 Answers

2008 sierra that does alot of bucking when doing between 65-75mph. Was suggested that I clean the throttle body and fuel injection system and did but did not fix the problem. If idoling it runs great.


I have had similar problems and the solution was to change the spark plug wires. If you have over 75,000 miles on your Sierra, it's time. Other than that, you would need an onboard diagnostic.
Good Luck.

Dec 16, 2010 | 2008 GMC Sierra 1500 2WD

1 Answer

What should my oil pressure be on an 89 GMC 1500 350 engine


It should be above 10psi. Normally going down the road it will be 30-40

Nov 02, 2010 | 1989 GMC Sierra

2 Answers

98 gmc sierra sputters and clacks when first accelerating


It could be one of your sensors, take it to an auto parts store and have them plug into the computer to get a print out of the problem....you also should check your converter, may be plugged. Good luck.

Aug 03, 2009 | 1998 GMC Sierra

3 Answers

What transmission will fit in an 89 gmc sierra?


if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

Nov 20, 2008 | 1989 GMC Sierra

2 Answers

1995 GMC Sierra


Just a thought, have you checked yout TPS(throttle position sensor)? I had similar problems with my 89 GMC Jimmy 4.3l, however a code 44 is strange. Also check to see if your problems go away if you advance the timing a few degree's.

Hope this helps

Jun 15, 2008 | 1995 GMC Sierra

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