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Sounds like the gearbox. But the test is this: Engage 1st and start slowly releasing the clutch pedal DONT HIT THE GAS. The engine should gradually fade out and bog down when the pedal is completely released. If the engine just bogs down at some point, or the fading is not gradual, the clutch is damaged. If you hear grinding its the gearbox.
It sounds like a fuel delivery issue, you may have a bad injector. this would cause too much fuel going into engine and cause the lack of power. First try adding fuel injector cleaner to your gas and get the highest octane at the pump, if that doesnt work pull the plugs and look for one that is wet or has higher carbon build up.
There are many other things that cause the D4 to flash. The D4 light turning off is similar to the CEL turning on. Some codes
cause the light to blink, some turn it off. There's an error code
stored, pull it and start from there.
Definitely pull all the codes and let us know what you find. Once we
know what the codes are then we can help you troubleshoot the issue/s. Alot owners talk about VSS (Vehicle Speed Sensor) but the VSS may or may not be part of the issue but per your description it
may sound like a main relay to a tranny issue.
Ok, im assuming your talking the car is turning over but not firing! The MOST common thing ive seen with these are flooding. What happends is the car sits to long, you made to many short trips. What you have to do if this is the case is keep cranking it ( turning the key to start it) and pump the gas very quickly. this allows more air into the engine and helps neutralize that rich mixture of fuel and air. This many take 5 to 10 min. and be aware its takes alot of juice out of your battery.
Sometimes the flooding is so bad you have to replaced the spark plugs, or at least pull them out and let the combustion cambers dry for 4 to 5 hours. After that installed the spark plugs and you should be on your way.
i thought i had answered this for you, i was old to tell you that it is a relay switch thats on the firewall or near the battery. if you want me to give you more info please email me, firstname.lastname@example.org and ill give you more details if you need them, my fiancee knows what the solution is and he isnt here right now but told me before...let me know!! thanks
if the car starts then there shouldn't be anything wrong with your fuel pump. fuel pumps either work or they don't. it sounds like you may be having a problem with your mass air flow sensor you can try cleaning it with an approved aerosol spray or it may need to be replaced. hope this helps.
Well this could be in your timing. As cars get some miles on them the timing chain stretches therefore causing you car to lose alot of power.So you may want to have your timing set on this car. Also I had a taurus that had a bad torque converter, and it lost alot of power on hills and under loads, also when i gunned the gas pedal. so try the timing first. Hopefully you dont have a bad head gasket or a cracked head these symptoms you are describing are all signs of head gaskets or blown heads