Question about 2003 Jaguar X-Type

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It feels like the map sencer or fuel injection problem

It idles up and down when parked

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Check the idle control valve

Posted on May 14, 2014

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I have a 94 chevy lumina it idles high in park and when i put it in gear it stalls i have replaced (one of the o2 sencers, egr vaule, map sencer, trottle sencer, and another sencer but not sure what it is....


throttle position sensor can cause the high idle as will a hole in the egr valve tube as far as stalling as soon as u put in to gear could be torque converter not unlocking but id check the egr tube first

Jun 07, 2011 | Chevrolet Chevy Cars & Trucks

1 Answer

When i remove vacuum line from map to throttle port and plug port it idles but if i open the port it stalls


The MAP is there to provide air pressure values from the inlet manifold to the engine control unit which in turn alters the pulse width of the fuel injection cycles. When the engine is at idle the throttle is closed and this creates vacuum conditions in the inlet plenum and as a result the voltage signal from the MAP should rise. Generally the MAP has 3 pins in the connecting socket, one pin is the 'reference' (usually 5 volts), the second pin is 'ground' and the third pin (usually the middle) is 'signal' voltage. At normal air pressure the MAP signal is about 1 volt. When vacuum is applied (idle throttle condition) the output signal rises by about 1 volt for every 5 inches of mercury pressure difference. At idle the voltage output will be high (4 volts) and the ECU responds by setting very short injection cycles. From what you have said is that the MAP at normal air pressure (as would be encountered when the throttle is open) is allowing the engine to idle just so long as no un-metered air gets in via the disconnected vacuum line. As soon as air enters the line the engine stalls. The stalling could be either due to too much air getting in making the air/fuel mix too lean or due to the loss of vacuum the fuel pressure regulator, creating higher fuel pressure in the fuel rail and therefore causing too much fuel to be injected per injection cycle. Check out the voltage signal from the MAP when applying a hand vacuum to it. Check the connector for dirt or corrosion. Check out the wiring from the connector back to the ECU for continuity.

Oct 29, 2010 | 1993 Chevrolet C1500

2 Answers

1990 chevy blazer 350 ci throttle body fuel injected . the motor is flooding out u can see the injectors keep dumping fuel into the throttle body


Sounds like you have an injector leaking. Have someone just cycle the key on and off to run the fuel pump but don't crank the engine. If you see fuel dripping from the injectors, unbolt the injector cover on the throttle body, remove the injectors and replace the orings around the injectors.

Jul 22, 2010 | 1991 Chevrolet C1500

2 Answers

Engine Light Flashing, car sounds rough, idle is up and down


It sounds like maybe a blown head gasket causing coolant to leak into the combustion chambers. If you have a mechanic friend, Better offer him a meal or something to get him/her to have a go at it. Taking it to a shop won't be cheap.

Mar 04, 2010 | Hyundai Motor 1997 Tiburon

1 Answer

Car wants to stall changed injecter,egr valve iac


hi
check the all vacuum pipes is their any leaks.

Feb 21, 2010 | 1994 Saturn Sl

1 Answer

I Have a 1987 Chevy Silverado pick up with a 350 fuel injected engine - 700R4 transmission - when i put the truck in gear with it idling it dies. Can anyone help me?


while truck is running..spay the base of the thortle body &intake to see if ur base gasket is bad,,or ck map sencer

Jan 30, 2010 | 1987 Chevrolet G20

1 Answer

Idle speed on Volvo 440 SE Auto 1997 it is revving at 1000 rpm at start up and park and it feels to fast how do I adjust it slower


most fuel injected car dont have a adjustible idle, most likely you have an intake leak
listen under hood for a sucking noise

Jan 03, 2010 | 2000 Volvo S40

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