Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
So right now the engine is cranking strong but will not start or does it seem to be cranking abnormally? Is this a V6 or V8 engine? How was fuel and spark checked?
Ok lets try spraying some carb cleaner into the air intake while an assistant cranks the engine so we can verify the engine will start and run on the spray and it is an injection issue. Usually on these if we have spark we should have injector pulse but lets confirm that. Also just in case lets make sure the battery is fully charged as low voltage can be the cause. Let me know.
OK good. Try the spray so we can see if it will start on the supplemental fuel.
OK this can also be the mass air flow sensor. Disconnect it and see if the engine will start and run.
Ok double check the red security led. It should come on for three seconds then go off when you turn the ignition ON. If so then we know it is not a security problem. We then need to put a fuel pressure gauge on the injector rail to make sure we have enough fuel to start the engine. Also we should check cylinder compression as I have seen instances with the secondary timing chain tensioners failing causing the chain to jump on the exhaust cam.
OK let me know.
Ok the only real way to check the timing would be to remove both valve covers to inspect the chains and make sure all the flats on the front of each cam are facing up hen the crank is set to the safe position.
Thats not good. If a new or used PCM is installed it must be programmed for the security system.
OK keep me posted and let me know if you need anything else.