Question about 2003 Jaguar X-Type

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03 jag. 2.5 ...it says I have a vacum leak and I changed upper intake gaskets, changed spark plugs, fuel filter and car still runs rough. I have pwer on take off put when I press the gas pedal there is nothing there no response any ideas?

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Check the backpressure on the catalytic converters

Posted on Jan 03, 2011

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have you check converter clug and o2 sensor
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The upper intake plenum is leaking coolant into the cylinder heads. The head gaskets on this motor are awesome. So, chances are it's the upper intake plenum. You can check this, by removing the vacuum hose that runs between the upper plenum and the brake booster. Stick your finger in and try to touch the top of the lower intake manifold. If your finger is wet it the upper plenum. You might as well replace the lower intake gasket while you're performing this work because they are prone to failure also. Use a shop vac to pull any coolant out of the cylinder heads. Get brand new spark plugs because the old ones are probably fouled. Once you get the plenum and gaskets replaced, remove your fuel pump relay and leave the spark plugs out and turn the engine over repeatedly for about 10 seconds to push any excess coolant out of the cylinder heads. Then, put the spark plugs in and turn the engine over for 10 seconds again. This will burn excess fuel as coolant out. Then, replace the fuel pump relay to allow fuel to be pumped into the heads. Car will smoke for a few when it fires up, but will clear out quickly. CHANGE THE OIL! Twice within a week if possible.

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My car keeps shaking and it like wants to stop


fuel or fire its one of them replace fuel filter change plugs wires cap rotor could be a cloged fuel injector or a vacum leak good luck

Feb 12, 2011 | 1993 Oldsmobile Cutlass Ciera

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I have 2005 f-150 Ford p/u with 5.4 liter engine. I have had truck at four different dealers and none can find out why truck runs rough, has check engine light, and shows only a code for random misfire....


the data for the code should show if the misfire is registering at idle or at a higer RPM. This is needed to know what could cause it. I hope that someone at least replaced the spark plugs so far. Next guess would be a intake gasket leak or a defective injector. If its running rough at idle start unplugging one coil or injector at a time. The engine should stumble a little if the cylinder is ok. If one does not change the idle at all then that cylinder is the one in question. Only options would be a defective injector, a defective coil, a vacuum leak on the intake, a bad spark plug, or a bad valve.

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Recently I had my 2000 gmc 2500 6.0 liter truck start running rough. I changed the spark plugs, checked the coil packs and replaced the fuel pumpand fuel filter. Still no change....Any suggestions?


ROUGH IDLING CAN BE CAUSE BY MANY THINGS.I AM LOOKING AT LEAKING VACUUM HOSES OR INTAKE MANIFOLD GASKET LEAK.DIRTY FUEL INJECTORS AND WORN ENGINE VALVES WILL CAUSE ROUGH IDLING.ALSO LOW IDLE SPEED CAUSE ENGINE TO RUN ROUGH.

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1 Answer

I have a 2002 caravan 3.3L engine light came on but was running fine. code Po171 (system too lean bank 1) no other codes. ran fine several days with engine light on . 3rd morning it wouldn't start. started...


the most propable cause is you have a vacume leak. Check all intake hoses for leaks and spray brake cleaner around intake gaskets if rpms change then you found a leak also clean your mass airflow sensor

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1 Answer

03 windstar rough idle working bad,worse in the rain


ford has a technical service bullitin out on this vehicle for the intake gaskets leaking causing a vacum leak that set codes 171 174. the solution is to have the intake manifold gaskets replaced . call your local ford dealer and see what thay can tell you about this bullitin.

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1 Answer

Car runs rough when cold


did you check the timing?

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