New engine just looking for suggestions, just dropped a new motor in my friends 84 rabbit, it is getting spark, and it is getting gas, but it wont start!!! we have tried many things, eg: looked at the fuses, tested the battery, tested the fuel pump, and much, much more but this car just wont start... any ideas?

I had a 78 rabbit did the same thing. It was the fuel pump relay. The connector was under size and burnt up. When you star the car on the old Rabbit the pump runs off the ignition switch. Once it starts the relay needs a pulse from the distributor to let it know that the car is running and keep the pump running after it starts. If not the relay times out and pump stops pumping gas. Its for safety so if in a accident and the engine stops the pump wont pour out gas

Ok well there is only two things that make a combustion engine run! If you are getting gas to the fuel rail and it has adequate fuel pressure at the rail then you have a spark problem! Pick up a spark tester( looks like a plug wire in a way but has a light ) Plug it into the first plug on the right side of the motor,(# 1 cylinder) and have a friend turn over the motor. There should be positive spark and the light indicator should light as a constant . If it is intermittent in any way than spark is why u will not start. Then on these years I always start with a new coil or coil packs depending on your type of engine! Hope this helps!! Just my opinion and I could be wrong ! Good luck.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jeff_24365d731679262d

poor spark plugs, dirty injectors, poor gas, thermostat opening too soon, how you drive the car, dirty air filter, jack rabbit take off from a stop. just some things that can cause this.

Although more info would be helpful, the first thing that comes to mind
is that, somehow, the power to to ignition system was disconnected
when the starter was installed. Easy to check... take off a spark plug
wire at the spark plug, put a small piece of wire in the end, and place
this 1/4 inch away from engine block... be sure there is no gasoline or
gas fumes near. Have someone crank the engine and look for spark
from the plug wire to the block. If no spark, may well be the ignition
system (do this in shaded area so you can see the spark). If you have
spark, then the problem is elsewhere.

Well I tried doing those things but what I thought was the filter, underneath the car just pass the pump in front of the gas tank obviously is not the filter and don't know where the filter is located.

Well something is leaning out the mixture when warm. I'm thinking the EGR valve is either sticking or its vacuum diaphragm is leaking. the EGR is usually not allowed to work until the engine warms up. The EGR vacuum modulator could also be at fault.

For the engine to run you need gas and spark.
First could I ask you disconnect one plug lead , get a spare plug (if you have one) and connect this to the lead and earth the metal part of the plug to somewhere metal on the engine,ask a friend to turn the motor over and see if there is spark.

Please always have a fire extinguisher handy.and come back to me with the result

thank you

Remove and clean carb jets

Does the motor turn over? If it does, then you need to check to see if you have spark, gas and air. Check the air filter and replace if it is dirty. If the motor turnes over, remove a spark plug boot from one of the spark plugs and plug in a spare spark plug. Ground the plug on the engine and have some one turn over the engine. Do not touch the plug or wire when the engine is turning over. If there is no spark, I would say that the igniter in your distributor is fried or you may need to replace your plugs. Pull one out to see their condition. If you have spark, then remove the intake on the throttle body. Look down the throttle body and have some one push the gas peddal to the floor while turning the engine over. You should see fuel being injected to the intake. If you do not see any fuel, change the fuel filter if you have not done so recently. If the fuel filter has been changed then I would suggest a new fuel pump.
If the car does not turn over then check your battery voltage. If the battery is dead, it will not start. If you have 11+ volts then your starter is probalbly fried. Hope this helps.

check spark plugs or spark pug wires. These are the most common issues with no spark. 2. check all fuses. 3. check ground or battery cables. If ground is bad it can cause a no spark. Motor turns? or ROTORs TURN? If motor turns your getting spark.