Mazda Eunos 500 - Engine lacks power - investigation reveals strong sparks on all cyls fuel at all cyls compression to specification on all cyls timing ok. Removing spark plug lead on cylinder one makes no difference. Removal of lead on all other cylinders one at a time makes a noticable difference. ? have fitted new leads new spark plugs checked distributor cap for tracking ? 2L V6 1998 160k

If you have at least 40# of pressure to the rail, spark, compression, and the engine is in time...that only leaves one thing. Fuel injectors. I believe that the signal to fire the injectors comes form the crank sensor to the ECU

Fix your car right away by clicking the link I attached 1994 1999 MAZDA EUNOS 800 Factory Service Manual

If spark and compression seemed good you may need to check the fuel. I would assume that cylinder has its own carburetor. Make sure it is working by spraying some starting fluid through the intake while the engine is running. If the cylinder starts firing you have a carb issue. The often gum up from storage or poor fuel.

TRY EARTH LEAD DIRECT FROMBATTERY TO ENGINE FIRST.ASSUMING BATTERY IS FULLY CHARGED.(NEGATIVE END _ )

Australian version, also called Mazda MX-3 Precidia, Eunos 30X, Eunos Presso, Autozam AZ-3, Mazda AZ-3.

On 1.8L (K8) and 2.5L Engines Firing order: 1-2-3-4-5-6 Distributor rotation: Counterclockwise
Hope this helps.

Probably the wire. Check continuity of the wire from the computer to the injector.

Bummer, well it takes spark at the right time, compression and fuel to have the engine work.....Most likely there is a timing based issue, investigate ignition and valve timing.

www.engine-light-help.com/generic-engine-check-light-codes.html

Make sure you are getting gas and spark, they are a few ground wires that come off of injector harness that if they are not grounded will cause injector NOT to pulse re-check wiring and get back to me. Good Luck

You should try doing a tune up change spark plugs, wires, pcv,and fuel filter.it's reasonable to assume that the rings and
valves (inside the engine) have become worn. Worn rings
and valves will cause the engine to have low compression
and low compression = weak power.
You may be curious as to why the engine's lack of power is
most evident when driving up a hill. Well, when a vehicle is
going up a hill, the engine is under more stress than when
driving on a flat road. Therefore, any wear in the rings/valves
will tend to be revealed - in the form of compression - when
the engine is under stress.

you will need to have a mechanic verify that the rings and/or
valves are indeed worn. Incidentally, this generally involves
what's known as a "wet compression test".
If the mechanic tells you he positively confirmed a worn ring
and/or worn valve condition, don't immediately authorize him
to do the work. Why? Because, this type of work is very
expensive and therefore you'll want to get several opinions
before jumping into anything. By the way, even though this
vehicle's high mileage strongly points to the above diagnosis,
it's possible the cause of this problem is something else.
For example, one of the electronic sensors that controls the
engine may have gone bad. hope this help have a nice day.