Is it not starting or do you mean there is no spark jumping at the spark plugs?
Your engine is an interference engine which means if the timing belt breaks you can easily bend the valves.
You most likely have bent valves so do a compression check first.If compression is 0 or low you will have to pull the head and replace the bent valves.
SOURCE: Acura Legend 1994 fires, but won't start
'Fires' implies that you have spark and fuel; I think you mean that it cranks with the starter.
Checking these separately is not difficult, you need to remove one spark plug lead and insert a screwdriver, then position the wire and the 'extension' so that the shank of the screwdriver is close to, but not touching some metal related to ground. This is about any exposed metal on the engine.
When cranking, during each revolution you should see a healthy blue spark between 1/4" to as much as an inch.
This tells you that the system supplying the high voltage is at least working.
Of course that alone doesn't tell you that each plug is getting spark but to do that, you would need to remove each plug wire from the plug in succession and test them individually.
Generally, if you have a single failed plug wire or plug, the engine will start but miss noticeably and it isn't not likely that all plugs and wires fail at the same time.
Checking the fuel supply depends a little on the delivery system. I think your car does have fuel injection so look for a fuel 'rail' that runs parallel to the engine. This is a length of pipe to which the injectors are attached and delivers gas to them.
Most of the fuel rails will have a pressure relief valve on them that looks similar to a tire valve.
After cranking for a few seconds, depressing the center pin should result in gasoline squirting from it.
If it doesn't, you may have a failed fuel pump or a severely clogged inline filter. A bad fuel pump is more likely.
There are other points of failure such as a defective ignition switch but these will not normally fail instantly but become unreliable first.
When a recently run engine refuses to start, it is sometimes due to too much fuel in the cylinders (flooding) and this can cause plugs to fail to fire and can be alleviated by depressing the accelerator pedal completely to the floor and leaving it there; don't pump.
This causes more air to enter the engine without causing additional fuel to flow and will, after cranking for 30-60 seconds, dry the plugs out and allow them to fire again.
The fuel pump in your car may be fused so I would check the fuse box for any visibly blown fuses too.
SOURCE: 1990 Acura Legend, location of main relay for fuel pump
looked it up online, looks like its in the underhood fuse box but couldn't get a good diagram that shows which relay number it is. the website i use is sort of dependent on the manufacturer, apparently acura did not feel like sharing that info. hope that helps
SOURCE: replacing timing belt, water pump, on 2004 acura tl
My sincere apologies for the delayed response.
I have only been a free contributor to this site for the last 4-months.
I am personally going back to answer your unanswered questions.
I do not know if you still need this information, however I am answering it either way.
Click on the following direct Link. It has several Diagrams you will need for your Timing Belt replacement. Included are the Cover Bolt Locations, Tool Needed and Marks for your specific engine.
You may also want to Print out these Diagrams for future use.
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies...
http://www.2carpros.com/car_repair_information/year/2004/make/acura/model/tl/2004_acura_tl_timing_belt_diagram_marks.htm
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