I have a problem with a Ford F-350 will start no problem will drive then when I park it shuts off like it’s flooding sounds like dead battery but it still has juice I checked there’s gas there’s spark all pistons running but the passenger side barely heats up we changed the cat made it run better engine light doesn’t show up right away anymore but still stalls after one round test drive what could it be I re done the timing checked for compression everything’s good checked computer it’s saying drivers side is lean all the way and passenger side keeps going lean rich back and forth what could it be?

SOURCE: 1991 dodge colt won't idle when engine is cold.

probably oil, it may be too thick when it's cold but once it warms up it liquefies and your engine runs smoothly. you could try changing oil, I'm guessing if you have a high performance oil the chances this is the problem may be greater since high performance things are usually geared towards working well when everything is hot

SOURCE: My 1991 Colt 1.5 won't idle,when engine is cold??? HELP.

you might wanna use a thinner lighter oil

Richard Lilja

• 401 Answers
• Posted on Nov 30, 2008

SOURCE: colt idle problem.

Most likely you have a bad Idle motor which is a small motor mounted on the intake manifold. If the motor can run better with your foot on the gas but dies if removed then it is probably this. This motor is controlled by the OBDII computer which gets it's control signal from the temp sensor which is located either on the radiator or engine block (which could also be bad), if the electric fan (if equipped) turns on then this is not the problem part, but the idle motor is. Another possibility is that you have some bad /cracked vacuum hoses which should be checked for first, before replacing the idle motor.

SOURCE: 1990 Buick Century 3.3L Check Engine Light comes on, stalls.

Need to check for fault codes. Possibly a faulty sensor causing the fuel system to run rich or lean.

SOURCE: 2001 Tahoe: Hard to start, idles rough, check engine light on.

Flashing check engine light is missfire, fuel pump probably causing multiple tries to start.Having to build fuel preasure,vac leak on one side of intake probably causing rich/lean condition.Also check back preasure to cat ,Sound like you are moving down right track.Mas air flow would probably set lean code bank1 and lean code bank2