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jeffrey590, ASE Master Technician
Category: Car
Satisfied Customers: 2847
Experience:  ASE Master Technician , Saab Master Technician w/ 35 years Dealer Experience in Advanced Level Diag.
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1993 Mitsubishi Montero. Runs fine, but wont start when hot

Resolved Question:

1993 Mitsubishi Montero. Runs fine, but won't start when hot
Submitted: 8 years ago.
Category: Car
Expert:  jeffrey590 replied 8 years ago.

When you experience the no start condition, does the engine crank and fail to start; or does it fail to crank at all?? ...jeffrey590
Customer: replied 8 years ago.
engine cranks fine and sometimes almost fires. when Cold it starts fine.
Expert:  jeffrey590 replied 8 years ago.
OK...You need to determine if youre losing SPARK or FUEL or if a sensor is faulty...Heres where to start...Check air cleaner element and make sure its clean...clogged filter will cause rich mix and inhibit hot ,check for any engine vacuum leaks...this will cause a lean mix and also give you similar conditions....make sure spark plugs are not fouled or worn and are gapped to spec....while your checking the plugs,ground the metal threaded base and have a helper crank over engine to be sure you have a good hot spark....Finally, I have seen several posts on Mitsubishi web boards referring to failed Intake Air Temp cant really test this without a scan tool, but if its inexpensive it may pay to install a new stated they seem to have a higher than average fail rate...jeffrey590
Customer: replied 8 years ago.
allof what you mentioned has been done already. Except I did also change the coolant sensor, but not the air intake sensor. Thanks anyway
Expert:  jeffrey590 replied 8 years ago.
As mentioned try the IAT sensor as the failure rate seems to be quite high...What is the fuel pressure reading on your vehicle??
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