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My 1999 altima is a 5 speed manuel transmission car. The car runs good until it gets hot. Then the car will start to **** very hard and stall out from. I had the fuel pump installed ,spark plugs and new wire's installed on the car. Does anyone have any suggestions on this matter?
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hot oil is thinner, ATF. cold works better, CLASSIC case.
my guess ,si the mean A;T pump pressure falls like a rock hot.
in all cars, FSM
all cars have these pages. that are on car tests for A;/T
(sure check all fuse...all time ,every time)
1: stall tests. on car, parked, running, test. brakes set hard.
yours i bet will fails this hot.
2; pump tests. (pressure guage)
id bet yours fails test 2 too.
and means...... its bad. the box is bad.
RTM read the FSM. do the simple test, and bingo.
the stall test takes no tools (if you have a tachometer) if not get one.
You will have to figure out if it is a fuel or spark problem to proceed. Vent in gas tank could be causing the pressure in the tank to cause a loss in pressure to the injectors. Something electrical such as a relay could be failing. Is the check engine light on when the engine is running ?
Possibly a transmission issue. The transmission has a "lockup" mode, where a clutch connects the engine directly to the transmission at cruising speeds. It is then supposed to unlock at lower speeds and for stopping. If it doesn't unlock, the car will stall at a stop. Try putting it into neutral (carefullly, so you don't go into reverse) as you slow down, if it doesn't stall out, it is most likely the transmission lockup mechanism.
If it stalls in neutral it is an engine issue. Bad idle control, bad ignition (it's easier to fire at high speed), bad fuel injector, bad air flow/pressure sensor... and more possibilities.
Did the car stall out? If the car stalled out she would have had to step hard on the brake to get the car to stop. When a car stalls you loose the power brakes causing most people to panic and step too hard on the brake causing them to lock up. If the car overheated there should be an inactive code in the ECM. Bring the car to an Auto Zone and they will scan your ECM for free. Good Luck!!
Common issue at the shop (i'm a ford technician), here is what I do to correct it. Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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