Car won’t crank after an engine swap project

Well,

I've decided to swap the old 2.3 NG engine from my AUDI 90 for a 2.8 AAH from the Audi C4. It all went well, and the engine is bolted half way to the tranny.

It won't crank at ALL. Just a loud click, lights go very dim but visible. Jump started it, nope. Same thing.
I had a similar starter laying around and I took the brush assembly with the stator and rotor, basically the whole "motor" part and put it onto the Audi C4 starter "head" and it does the same thing, so starter is not a problem.

Only thing I am thinking, the flywheel is VERY close to the tranny,

Experienced mechanics share their insights in answering this question :
Hi there. It seems that the swapped engine clutch is not connecting properly to the transmission and may be binding up causing the engine to not start. Try unbolting the transmission and sliding it out, and then try turning the engine over by hand. If the engine cranks by hand, then the clutch was binding up. If the engine does not crank by hand, then there is an issue with the engine internally. If you need further assistance with your engine not cranking up, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

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

If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
Dead car battery: A dead battery is the most common reason why a car won`t start. If you have a battery tester, check your battery to see if it`s weak. If you don`t have one, try to jump start your car with jumper cables.
Broken or Damaged Ignition

If your headlights can turn on, but your car won`t crank, that means that your battery is charged, but either the starter or ignition is the problem. If the starter or ignition is the problem, a starter engine can be jumped by using a charged battery.

Connected to the battery is the alternator, which works to generate power for your vehicle`s electrical components. When you have a brand-new battery but still can`t start the car, the alternator might be the issue. Cold and damp climates may increase wear on an alternator, causing it to fail.
Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly.
Most of the time it is found that a dead battery is causing your car not to start. Even if the battery is not dead, then a weak battery can also cause your car to crank but not start at all. You can use the jump-start method to start the car and recharge the battery.
Engine won`t crank. If the electrical contacts inside the switch have failed, turning the key to crank the engine might not result in any response at all. Engine starts and stalls.
With a cranking system, symptoms are divided into one of three possible troubleshooting categories: Click — No-Crank (solenoid clicks but starter doesn`t crank) No-Click — No-Crank (solenoid doesn`t click/starter doesn`t crank) Slow Crank (starter cranks, but engine RPM slow to start vehicle)
The car makes a cranking sound, but doesn`t turn over

A) Make sure the fuel tank has fuel in it; it might have leaked out due to untightened bolts, or it might have never been filled in the first place.

The engine won`t turn over. The most common signal that your starter has a problem is if nothing happens when you turn the key or push to start. Unusual noises, such as clinking, grinding and whirring. If you ignore these sounds, it can eventually lead to damage to the engine flywheel.
When an engine cranks for a long time before it starts, either spark or fuel is missing or weak and each has its own reasons. Most of the time, the air / fuel mixture has been disturbed and there is too much air or not enough fuel.
The engine won`t turn over. The most common signal that your starter has a problem is if nothing happens when you turn the key or push to start. Unusual noises, such as clinking, grinding and whirring. If you ignore these sounds, it can eventually lead to damage to the engine flywheel.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car won’t crank when it’s cold and now won’t start at all
ANSWER : Hi there:

Usually this issue is cased by low cranking amps inside the battery. If you’ve recently had the battery replaced, it’s possible that an electrical component that makes up the charging system might be damaged or faulty. It’s also quite possible that the main electrical relay or the starter relay is giving you fits. To know for certain what the exact issue might be on your 1989 Toyota Camry, you should have a professional mobile mechanic complete a car is hard to start inspection, so they can pinpoint the source of your issues and recommend the right repairs.

The car crank but won’t start
ANSWER : Hi there. This does sound like an issue with the wiring. If the check engine light is coming on every now and then this means that when it does not come on there is no power to the computer. This can be the wiring harness issue or an ignition switch problem. I would have to test for voltage to the computer when the problem is occurring to be able to find where the issue lies. If you need assistance, a certified YourMechanic technician can be dispatched to your location to inspect your vehicle’s non-start issue and suggest any necessary repairs.

Car won’t start. The check engine light, battery light, and oil change light are coming on. I tried jumping the car and nothing happened. Why won’t my car start?
ANSWER : Hi and thanks for contacting Your Mechanic. If sometimes your vehicle will start with the new alternator and sometimes it won’t, then there is a loose connection in your charging system. Check all of the wires to the alternator and to the battery. Make sure that the battery cables are clean and tight. Make sure that the wires to the starter are clean and tight. A loose ground to the ignition system will cause the vehicle to not crank over. Check all of the ground wires from the battery to the starter. Make sure that they are clean and tight. If you need further assistance troubleshooting your no start situation, then seek out a technician, such as one from Your Mechanic, that can assist you.

Out of the blue when I started car, the engine and gas was fine when cranked but the car did not fully start. The engine oil pressure light came on.
ANSWER : Hi there. Check the engine oil level. If the oil level is low, then top off and recheck the symptoms. If the engine oil is full and the oil pressure light is lit up on the dash, then either the oil pressure sensor has failed or the oil pump has failed. Take a look at the oil pressure sensor and see if the contacts are loose or damaged. If the oil pressure sensor seems to be intact, then I recommend removing the sensor and putting in a test gauge and checking the oil pressure as the engine is cranked. If there is oil pressure of 25 psi or greater, then the oil pressure sensor needs replaced. If there is no oil pressure, then the oil pump needs replaced. If you need further assistance with your warning lights being on for the engine oil, then seek out a professional, such as one from Your Mechanic, to help you.

Car won’t start even after a jump. Things turn on, engine cranks but won’t start.
ANSWER : The problem sounds like the battery is too low to crank the engine and was most likely caused by the alternator not charging. You should have battery fully charged for at least 15 minutes and then see if it cranks over. You may need to replace battery and alternator. Have the system checked and replace these components as needed.

The engine of the car runs, but when I push the gas pedal it does not accelerate, and the engine does not rev.
ANSWER : Hello. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly. It’s probably a good idea for you to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can pinpoint what is causing this issue to occur and they will recommend the right repairs be completed.

Car won’t crank after an engine swap project
ANSWER : Hi there. It seems that the swapped engine clutch is not connecting properly to the transmission and may be binding up causing the engine to not start. Try unbolting the transmission and sliding it out, and then try turning the engine over by hand. If the engine cranks by hand, then the clutch was binding up. If the engine does not crank by hand, then there is an issue with the engine internally. If you need further assistance with your engine not cranking up, then seek out a professional, such as one from Your Mechanic, to help you.

My polo 3 won’t start when engine is warm or exposed to the sun for a long time
ANSWER : Hi there,
The problems you are having with your vehicle, may not be easy to diagnose. Apparently, under hood temperature and ambient temperature both create the no start condition. Components can act-up with temperature change. Assuming no check engine light is on. The no start condition will have to be duplicated and inspected at the time of no start. This will help identify what is wrong. So many things can keep the vehicle from starting. I recommend having the vehicles no start condition be inspected and diagnosed by a certified technician from YourMechanic.