2CarPros - Car Questions & Answers

2005 Mazda 3 Repair Question


Topics covered: Engine, Spark, Fuel pump.
Mileage: 62,500 miles.

Asked on December 20, 2010

Mazda 3 overheated - won't start

My daughter has a 2005 Mazda 3 that sufferred a damaged radiator and lost coolant while she was driving. The car quit running about 10 minutes after the damage.
The engine will still crank without any unusual sounds, but will not actually fire. We have ordered a new radiator. Is there a safety system that might be preventing the engine from starting until it is reset?
Avatar Asked by fempersive

Answer

Replied on December 20, 2010

It doesn't have a fuel cut off switch like a Ford-check for fuel and spark-Do below

Cranks but no start condition:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem,Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard i

Tiny Answered by rasmataz
68 questions asked
Replied on December 21, 2010

further info --
Car does have both spark and fuel, but 2 different compression tests showed zero compression. When cranking the car, engine seems to spin very easily (just like other cars that I have owned in the past that had a broken timing belt) -although the timing chain seems fine and the camshaft is turning when the engine is cranked.

Tiny Response from fempersive
3 questions asked
Replied on December 21, 2010

Time to open it up and investigate the valves/rings/cylinder for wear to include the timing chain -could be stretch/jumped time

Tiny Answered by rasmataz
68 questions asked