Jaguar Repair: 85 s-3 wont start, air fuel ratio, gas piston

Question
QUESTION: hi howard i have a series 3 1985 that wont start it has no pulse at the injectors, it does however have,
crank
good blue spark
fuel to the injectors BUT NOT INTO THE CYLINDERS
power to the ecu and the power resistors
pulse at the cold start injector
fuel pump and cold start relay operating
diode unit appears in good order
injector pulse sender wire from ignition coil to ecu     (white with black stripe) conducting pulse to euc
new 4x4 battery 620 cca fully charged

and it is still not starting, not even a fliker off the cold start injector.
please help as i am running out of ideas
michael

ANSWER: Hi Michael,
You say you have a pulse at the injectors. Did you check them with a "Noid" light and are the injectors "Clicking" (use a stethoscope)?

All gas piston engines only require three items to run, compression, fire and fuel with conditions.

Compression must be sufficient (130 to 180 PSI tested with the throttle open)
Fire must be a strong spark (blue in color) at the correct time.
Fuel must be a combustible fuel available to the combustion chamber in roughly the correct air/fuel ratio and atomized or vaporized.

A timing light will check spark and timing.
A simple test of fuel is to spray starting fluid into the intake when trying to start the engine.

You should also test manifold vacuum when trying to start, (throttle closed)

You told nothing of the history. Has this car been running lately? Did it just not start one day or did it die when running?
Howard


---------- FOLLOW-UP ----------

QUESTION: hi Howard
i don't have pulse at main injectors (tested with a noid light# i do have pulse at the cold start injector
fuel is good and if added to cylinder via spark plug holes or intake manifold engine fires
compression seems good
timing is fine
history of the car
it was owned by a man #Ian) in Sydney who drove it happily for many  years with out problems, then the differential seals started to leek and one of the right rear caliper pistons locked on so the car did not pass its road worthy certificate so Ian drove it home an parked it on the verge.
he purchased another differential and seals and then decided he was getting to old to be messing about with cars and left it there for 4 years, until i came along by this stage it was rusty in all the normal places, dented thanks to nebouirhood kids and the windscreen was smashed.
i have spent the last 4 months straightening the body out which is nearly finished, now i would just like to take it for a quick lap around the block.
many thanks for your time
Michael

Answer
If you are able to spray fuel into the intake and it fires off and you have no light from a noid light and do have power to each injector and you do have ignition and pulse signal (AT) the ECU and have power (AT) the ECU and a ground and no pulse (grounding signal) on any of the injector wires (AT) the ECU then it seems you have a bad ECU (which is rare) (unless you have been doing some electric welding on the car) (or connected the battery up backwards once)

I have been working on Series III Jags for many years and only ran across ONE bad ECU. If you can find a Jag shop near you should be able to a working used ECU to try.
Howard