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Doug
Doug, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 8538
Experience:  ASE Certified Factory trained technician
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Mitsubishi TS Magna: I have a TS Magna automatic - it cranks

Customer Question

I have a TS Magna automatic - it cranks over but wont't fire - this doesn't happen all the time, just when you are running late???
Submitted: 1 year ago.
Category: Australia Car
Expert:  Doug replied 1 year ago.
Hi,
This can be a very difficult situation to try to resolve while the problem is still so intermittent. Unfortunately to be able to figure out what is wrong, the problem needs to be currently present in order to verify a failure.
The best thing to do is be prepared when it happens next time and gather as much information as you can while the problem is occurring. A no start condition will nearly always be either fuel, spark or compression related.... the compression will not change from day to day so you can rule it out. So that means you would want to try to verify if there is spark while cranking when the problem is occurring. If there is no spark, then you would want to check your crank sensor signal primarily as well as coil resistance.
If there IS spark, then it is most likely a fuel pressure related issue... a fuel pump that is bleeding back pressure or a fuel pressure regulator that is leaking over night etc.
While it is possible to have sensor related issues (for example a coolant sensor that is reading WAY too cold, causing intermittent over-fueling based on the wrong temperature), these are much less likely to be the case, and would require a full function scan tool to diagnose anyway... making on the spot diagnosis not possible, and leaving it at a shop until the problem occurs again could take a long time of course. Best to try to identify if there is an obvious spark loss first as that gives you some room to work with the issue before you have to rely on a shop to go further.

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