2000 GMC Yukon 2000 GMC Yukon Denali 5.7L
I swapped Cylinder Heads for a pair of used Cylinder Heads due to the first pair being cross-threaded. After properly installing Heads and torquing them down, NO COMPRESSION when removing sparkplug and putting finge on hole.
2000 GMC Yukon Denali 5.7L
I swapped Cylinder Heads for a pair of used Cylinder Heads due to the first pair being cross-threaded. After properly installing Heads and torquing them down, NO COMPRESSION when removing sparkplug and putting finge on hole.
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2000 GMC Yukon Denali 5.7L
I swapped Cylinder Heads for a pair of used Cylinder Heads due to the first pair being cross-threaded. After properly installing Heads and torquing them down, we then began to align crank up with TDC Mark and then aligned rotor on distributor to the distributor cap mark. After that, we tried to start it, but it would only just turn over but not start at all. The belt would turn the pulleys and all, but it just seems like it isn't making that starting sound. The fuel pump kicks on and its getting fuel. So we then removed spark plug and decided to put my finger on the hole while the Mechanic used a wrench to turn the crank until I was able to feel air, but no air would blow on my finger at all. So we then removed valve cover and aligned the valves at TDC until both were closed, then put everything back together and still no start. Mechanic then had checked for spark at the #1 plug by removing plug while I tried to start it, and it was getting spark, PLEASE HELP
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You did not explain why/how the original head got cross-threaded so I assume there was a problem prior to the head exchange. There are only a few choices: the original problem was never diagnosed and repaired, the new heads were not properly installed and timed to the engine or the distributor is not correctly installed. Not knowing the details and assuming there were no pre-existing conditions.... it sounds as if you have not properly timed the engine. Remove all the plugs from the engine, install a compression gauge in the #1 cylinder and spin the engine with the starter. If you have compression check the position of the crank on the compression stroke to be sure the mark on the harmonic balancer aligns with the timing mark on the timing tab. Also check the distributors rotor button to be sure it aligns with the #1 plug wire. If you answer NO to any of the above......you have a timing problem.
