Question about 1998 GMC Yukon

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I need to know where is the #1 spark plug on a 1998 gmc yukon

I need to know the #1 spark plug on a 1998 gmc yukon to get tdc..

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V8 engine? That would be drivers side front. Remember that TDC is number one piston up (On the compression stroke, not exhaust stroke), timing marks at zero.

Posted on Jun 05, 2010

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1 Answer

Where is number one spark plug wire on dist for 1950 gmc 216 ci


Since distributor may have been moved, best is to turn engine with #1 plug out until you get to TDC compression stroke on #1, then remove dist cap to see where rotor is pointing.

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What is the position of the ditriburator on yukon 5.7


Remove distributor cap, make sure you unplug ignition coil...remove no. 1 spark plug. have someone bump key slowly while you put your finger where the plug goes...you will feel pressure push against your finger...when the pressure stops, your No. 1 piston is at top dead center, your rotor will be pointing to where your No. 1 plug wire should be. Place your distributor just above without installing . If not aligning place your No. 1 plug wire there.. , and use that as a starting point for your firing order....good luck !!! Hope this helps...

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1 Answer

Cap firing order


The firing order for 5.7 L is 18436572, Number 1 is on the drivers side followed by 357 all on d/s even number on passenger side. Generally, the tower that is pointed at the number 1 cylinder is the number 1. The engine has to be at TDC on the ! cyl for this to be affective. To place the cyl on TDC, take the ! cyl spark plug out and using a gauge to see when pessure is achieved is best, but you can also use one of two alternatives.... Take a small screwdriver, and you will understand momentarily, place it in spark plug hole. manually crank engine clockwise until spark plug reaches highest point and that is TDC. The problem is, that you dont know if it is power or exhaust. So, first take a small towel and wrap around screwdriver and have a friend crank engine by hand using harmonic balancer bolt. You wil feel and hear the pressure build behind the plugged hole when number 1 is on pressure stroke. Then you can use previous tip with screwdriver to hone in on TDC.

Sep 10, 2013 | 1994 GMC Suburban

1 Answer

What is the gap size on a 1998 gmc yukon


Hi there:
Spark plugs that you buy, should be pre-gapped for this application... 0.60 is the factory gap



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1 Answer

Starting issues


So you know it is not getting fuel thru the injectors.
Have you checked fuel pressure at the rail, and do you know if the pump is running when you turn the key on ?

Sep 11, 2012 | 1998 GMC Yukon

1 Answer

I replaced cap rotar and dist. now it cranks over but will not fire and is back firing


the timing is off a bit! heres how I do it. remove the number 1 plug, stick a straw or similar in plug hole. turn engine over by the crank shaft with a wrench. when piston gets to very top of bore, just before it goes down. this is tdc. remove distributor cap and remove distributor reposition the distributor rotor button facing number 1 plug wire inside cap. replace cap and try it! please let me know if this works for you. good-day ! if you can not get to number 1 plug. just turn the crank to tdc marks are on damper pully or crank. is this a 5.7,

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1996 GMC Yukon spark plug wires diagram


Need to see diagram for 96 GMC Yukon spark plug wiring

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1 Answer

How many spark plugs for a 98 gmc yukon


depending on which engine your truck has ;
4.8L (VIN V, 8th digit) = 8 spark plugs
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1 Answer

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