Question about 1999 GMC Yukon

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Not getting fire to plugs

1999 5.7 4x4 yukon new heads cranking over but no tgetting fire to plugs

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  • 37 Answers

You need to see if you are getting a signal from the crank sensor.

Posted on May 25, 2009

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Posted on Jan 02, 2017

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To reset it disconnect the Negative (-) battery cable for at least five minutes. But I know that will not cure your problem.

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You need spark at the right time, fuel pressure at the injectors, and normal compression.
Have the spark plugs been changed in the past couple of years ?
Have you checked the fuel pressure to see if it is enough ?
Have you sprayed carb cleaner into the throttle body to try to make the engine try to start ?
Does it sound like it has normal compression when cranking ?

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rechk plugs firing order. chk soliniod and coil r ok, rechk fuel is getting into engine- choking usually determines that, u can smell the over choked engine. I f engine turning & choked hold throtel to floor while cranking and leave there until it fires. if no firing happends it must be electrical. rechk electrical connections. Cheers

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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,

Apr 08, 2012 | 1997 GMC Yukon

1 Answer

I have a 2001 Yukon Denali that won't start. It


You need to make sure that the engine has what an engine needs to run. The obvious ones are fuel and spark. Make sure there is at least 40LBS of fuel pressure at the injector rail when cranking. If so, you will need to make sure the injectors are opening. If you verify that the engine is getting fuel you need to make sure there is fire to the plugs when cranking. If it is getting fuel and spark, you need to make sure there is enough compression for the engine to run. And lastly, if it has everything else it needs to happen at the correct time.

Dec 19, 2017 | 2001 GMC Yukon Denali

1 Answer

Had the head redone, new Carb fitted, new distributor cover and leads new spark plugs, crank timing set to mark (0)and cam timing (2e)set to mark on head. the engine swings, fires from the carb, spark on...


Sounds like you have your timing off. If it is backfiring, that means that 2 of your wires are crossed, causing the plugs to fire on the exhaust stroke versus the compression stroke. Recheck your timing.

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1 Answer

Dodge 5.9 pickup


check the flywheel for damage...these to cylinders are directly opposite of each other in tyhe firing order...also a bad distributor could cause it

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