-The engine stops while I am driving at low speed or stop at stop signs or light
-It will restart immediately
-On the highway it runs fine
-Sometimes it runs fine at low speed or when I stop
-I am running a 1999 Isuzu Trooper
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If your mechanics say the mass air flow sensor, fuel pump and fuel filter is good then check your intake Manifold Gasket. It is a hard 1/4 inch thick plastic gasket that cracks frequently and causes sputtering when letting off your gas pedal and eventually lead to stalling at red lights and stop signs if cracked bad enough.
Illuminates when the ignition is switched on. It should extinguish as soon as
the engine starts.
If it illuminates with the engine running, it indicates a malfunction with
the engine management system. Have this checked as soon as possible.
If it flashes when driving, reduce the vehicle speed immediately until the
light illuminates constantly. If it continues to flash, avoid heavy acceleration
and high engine speed, stop the vehicle and have it checked immediately.
On some vehicles this light may be red - again stop the vehicle and seek
If it is safe to do so, try stopping the vehicle, switching off the engine,
wait two minutes, then restarting the engine to reset the engine management
system. With the light illuminated, the vehicle is still safe to drive as
long as no other faults are apparent with the engine. Have the vehicle checked
by a dealer or garage as soon as possible to avoid any damage being caused to
the catalytic converter
1) High idle switch is on..*(vehicle thinks AC is running but it isn't.
You can try turning on the AC and see if the engine slows down to confirm this one.
2) Sticking or worn out Idle Air Control or IAC, You might get a check engine light with this one.....you might not if it's a mechanical failure.
3) Simplest of all. A vacuum leak. You can get the engine vacuum read while running if you go to a mechanic with a vacuum guage or an OBD 2 ecu code reader. There should be specs on what vacuum levels are normal for you car at idle.
Most likley cause is the Rail Oil Pressure Sensor which is under the cam cover and sends info to the ECU . No or wrong info an the ECU stops the engine ,you can test this part by pulling out the white or yellow wire from the multi plug by the dipsick on the car side of the loom .All the other wires in this plug are pink so its easy to see. then if the car starts the sensor is at fault but get a new one !
It would usually start when completely cold, but idle around 2k RPM. It would drive fine. But if I shut it down, ran into a store, and came back out, it would start but immediately idle. Had to ride the gas a little to get it into gear. The Check Engine light has been going on and off for 6 months or so.
I took this to my local trusted repair shop (no Isuzu dealers within 200 miles). The diagnosed the light, and found that the Intake Gaskets were bad or leaking. The idling problem was related to the car not being able to control the amount of air coming in.
They replaced the Intake gaskets by the next day, and I haven't had a problem since. And no more check engine light, which has been on half a year.
Here's some details from my bill: (1) Intake Gasket set $107.95 Misc materials $21.00 2.1 hours of Labor
The total cost to me was $345.00, and I definately don't feel gipped.