Fuel starvation. If i am idling the car will just die. If I am driving it jolts like running out of gas. mechanics said fuel starvation If i take my foot off gas and put it back on, car is fine.
Well, fine for how long? Until you come back to an idle and it starts all over? Is it constant with the jolting- that probably is fuel starvation- but interesting that it sounds like something resets when you take your foot off and back on.
I can tell you right now that to start, you need to have the fuel pressure tested. The fuel pump has to maintain high pressure in the system at the engine for the fuel injection system to work correctly. Too low of a pressure, because of a weak or worn out pump, will cause fuel starvation, just as you described. This is a simple test and only takes a few minutes, so it should not be expensive to have it done, if you don't have access to a fuel pressure gauge tester.
If the fuel pressure is correct, it could be an injector problem, either mechanically or electrically related, but more likely and less expensive to test, is a problem occurring at the throttle body assembly. There are a couple of computer sensors there that should be checked- the Throttle Position Sensor has a lot to do with smooth acceleration and steady off-idle like high speed driving. This sensor especially needs to be checked. And there is an idle control motor or valve that the computer controls for smooth idle- the IAC (idle air control) system, just a small electrical piece mounted on the throttle body.
I would bet you have a fuel pressure problem, but sometimes your symptoms can be caused by a problem at the throttle body assembly-they all contribute to fuel starvation, or more precise they affect the fuel/air ratio. When that ratio is too far out of whack, it just kills engine performance .
Jun 01, 2016 |
Cars & Trucks