I had to get my coils and spark plugs change all 6. Mechanic said he had take out engine to get to back plugs. He did this and it

Coil and spark plugs were changed and my vehicle started once and never again. What could be the issue???? It acts like it wants to start, but doesn't come on. He said he removed engine. And from what I reviewed… That is pretty intensive labor on a mechanics part. Could there be a new issue or could he have just not put back a very vital part of my vehicle that he could have just innocently overlook????

My car has 170777 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
A mechanic would never remove the engine to change the spark plugs on 2004 Hyundai Santa Fe. The largest "part" of the engine that is removed to access and replace the sparks plugs is the plenum, which is simply part of the engine’s air induction system. If the service was described to you as requiring the "removal of the engine", that is wildly inaccurate and unhelpful to you as the owner of the car and the one paying the repair bill. If the vehicle was running prior to this maintenance, then in all probability it was not properly re-assembled and/or something was damaged in the course of the work. To get it running at this point, will require a no start diagnostic to determine if the fault is ignition, fuel, or air induction related. Failing to re-connect one or more critical engine sensors can also account for the no start. At this point, your options are to contact the shop to get it repaired under warranty (if the work was guaranteed) or you can request a no start diagnostic from YourMechanic and a certified Mechanic will be dispatched to resolve the issue for you promptly, right at your location.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Lack of Spark

Contaminated or fouled spark plugs are unable to ignite the fuel, which could be causing your no-start condition. Like the spark plugs, the ignition wires also need to be periodically replaced.

What Can Cause a No-Crank, No-Start Situation? If your car does not start and does not crank, there`s likely an issue with the starter or the charging system, which includes the battery, the battery terminals, the alternator, and any wire connections.
If you found oil has entered the spark plug tube galley then the oil may have shorted out all the coils and plug wires causing the engine no start.
Bad Sensors

Sensors that fail to send information to the computer may cause the engine to run less efficiently, and they can sometimes be the cause of an engine that won`t start. One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft.

A faulty ignition coil can also lead to a no-start condition. For vehicles that use a single ignition coil as the source of spark for all of the cylinders, a faulty coil will affect the operation of the entire engine.
A Bad Crankshaft Position Sensor

The crankshaft position sensor monitors the position and rotational speeds of the crankshaft. Without the crank sensor, the engine control module (ECM) wouldn`t know when to fire the fuel injectors and ignite the spark plugs.

A failing points and condenser system can cause rough running, misfires, lean and rich conditions. If the engine is difficult to start, and runs rough once it does start, then it is time to contact a mechanic to have a look at the system and find out exactly what the problem is.
Spark plugs that are worn out, not properly installed or tuned, or just not up to spec, will cause the engine to misfire, chug, and lose power. The fuel tank breather pipe or valve is often overlooked as a cause of engine chugging and loss of power.
Repeated overheating of the spark plug tip can cause the plug to prematurely fail. Overheating can be caused by many things like pre-ignition and a malfunctioning cooling system. Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail.
A clogged or failed exhaust gas recirculation or crankcase ventilation valve or faulty oxygen sensor can send the wrong signals to the computer and cause misfires.
The most common causes of misfires are worn, improperly installed, and mishandled spark plugs, malfunctioning ignition coils, carbon tracking, faulty spark plug wires and vacuum leaks.
Once the engine is cranked, you should look for blue sparks along the spark plug gap. If you can see blue sparks, this proves your ignition coil is working correctly. If you don`t see blue sparks or you see orange sparks, this is a sign that there`s a problem with your ignition coil.
Malfunctioning spark plugs can make an engine stop for a while and resume its normal functioning. It can happen when you are driving. The engine can also sound rough when idle. The misfires affect the proper functioning of your car`s engine due to failing spark plugs that have no power to ignite the fuel-air mixture.
Hard starts

Having trouble starting your vehicle? While your first thought may be a dead battery or an empty gas tank, bad spark plugs could be the cause. You won`t be going anywhere if your spark plugs can`t produce the spark to start the combustion process.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I had to get my coils and spark plugs change all 6. Mechanic said he had take out engine to get to back plugs. He did this and it
ANSWER : A mechanic would never remove the engine to change the spark plugs on 2004 Hyundai Santa Fe. The largest "part" of the engine that is removed to access and replace the sparks plugs is the plenum, which is simply part of the engine’s air induction system. If the service was described to you as requiring the "removal of the engine", that is wildly inaccurate and unhelpful to you as the owner of the car and the one paying the repair bill. If the vehicle was running prior to this maintenance, then in all probability it was not properly re-assembled and/or something was damaged in the course of the work. To get it running at this point, will require a no start diagnostic to determine if the fault is ignition, fuel, or air induction related. Failing to re-connect one or more critical engine sensors can also account for the no start. At this point, your options are to contact the shop to get it repaired under warranty (if the work was guaranteed) or you can request a no start diagnostic from YourMechanic and a certified Mechanic will be dispatched to resolve the issue for you promptly, right at your location.

Spark plug chaos. Rubber stoppers are preventing the spark plugs from coming out.
ANSWER : Hi there. Try using a pair of small needle nose pliers to pull off the rubber boots from the spark plugs. As you pull, twist the rubber boots to break them free. If you cannot get the rubber boots off, then try using some mineral oil on the boots to aid them off, then clean off the oil with soap and water with degreaser. If you need further assistance with removing the boots from the spark plugs, then seek out a professional, such as one from Your Mechanic, to help you.

Engine light fault. There was a bad spark plug and a failed ignition coil. Replaced both the coil pack or spark plug.
ANSWER : Hi there. If the light is coming on then shutting off and returning on, then if the issue is for the same coil, there could be an issue with the wiring on the coil plug. Check the wiring on the coil plug and see if the wires are split, broken, or burned. If there is nothing wrong with the plug, then the main engine harness has an issue / short and may need replaced. If you need further assistance with your ignition system, then seek out a professional, such as one from Your Mechanic, to help you.

Engine will not stay started. I have replaced idle control valve map sensor spark plugs spark plug wires no check engine light is
ANSWER : You have a problem with the distributor assembly. I recommend replacing the distributor assembly. This will replace all the possible sensors and coil for the ignition and fix the problem you have.

p0011 code,check engine light one, changed bank 1 vvt solenoid and check engine light still on?
ANSWER : The P0011 code is typically caused by oil issues with the car. I would particularly make sure the engine oil level is not low. The VVT solenoid relies on proper oil levels to do their job. If they don’t have enough oil, they won’t work. You can have a mobile technician from YourMechanic visit your home or office to inspect the Check Engine Light for you. If you follow through with a repair with us you will be reimbursed for the cost of inspection.

Had a spark plug blowout, but the threads are fine and intact, plug was able to screw right back into place. What can cause that?
ANSWER : This is a known problem with this engine and Ford/Mercury has a technical bulletin for installing an insert into the spark plug hole. You may not think that you don’t have a loss of threads in the hole, but you do. The heads only have about 4 threads for the spark plug hole. The head is made out of aluminum and will wear out if the spark plug is not tightened to exact specification the first time a plug was in the hole. When the plug moves it will wear the threads until the plug flies out. The next plug goes in fine and you might think that it’s held in securely but it is not and soon flies out.

The only fix is to put an insert into the hole or have the head replaced. The technical bulletin I mentioned for your vehicle is the one from 07-21-2 dated Oct. 2009. I’d recommend having a certified mechanic diagnose your particular issue, they will be able to inspect why oil got into the spark plug well in the first place and make any necessary repairs.

I have a engine miss codes po174 po420 are on now I had code multiple cylinder miss fire. I changed spark plug wires and plugs l
ANSWER : Hi there. Your issue might be caused by a faulty O2 sensor. You might want to read this article about the P0174 OBD-II trouble code as it will show you possible causes, symptoms and solutions to resolve the problems.

Misfire on coil one and two
ANSWER : It is possible that the coils were damaged by the bad plugs. The spark output of the coils may be bad on the two cylinders in question. If you want to chance it and only replace the spark plugs then go ahead. If the misfire is still happening then you will pay for labor to replace the coils again.