HELP Mustang engine power loss, rough idle, engine shake
My 01' automatic v6 started making a little noise months ago which slowly got worse, turned out to be exhaust leak right before the flange on the exhaust manifold. The small leak eventually turned into the whole pipe off the flange and a rediculously loud noice. The day after the pipe came off I had been driving for about 5 minutes and suddenly it started to run horribly: huge loss of power, delayed/weak response to gas pedal, trouble changing gears a couple times, whole car shakes when idle in any gear, also after coming to a stop or reving it then letting it idle the engine will start to sputter and sound like its going to shut off. The same time it suddenly started running that bad the check engine light started blinking. Diagnostics came up with code p1401, I figured it was from the exhaust manifold being broken. I have just replaced the manifold and the noise from the exhaust leak is gone, but all the other problems are still there. So i replaced the spark plugs and spark plug wires, also the fuel filter, about a month ago when it was still running ok i replaced the egr vlave. The only mod on the car is a K&N CAI, i've had it on for about a year and a half. ANY help diagnosing what is wrong with it and what to do would be a huge help!
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It's very difficult to see how the power steering could cause your car to shake and vibrate. If the power steering was leaking you would see fluid somewhere .. and the steering might be heavy.
You say this also happens when the car idles?
What springs to mind here is defective engine or gearbox mounts. I would also suspect that the cause of the vibration is what caused your exhaust manifold to crack.
If you let the car tickover and open the hood can you see the engine physically move? Check those engine mounts ..
Another possibility (and this once happened to me) is that the flywheel -on manual transmission or torque converter -on automatic transmission is loose. If those bolts which hold it onto the rear of the engine are loose it can cause vibration severe enough to make the teeth in your head rattle, not to mention make the car vibrate and rattle as if you're continually driving over deep potholes with out of balance wheels...
Transmission fluid problem? No.. that doesn't seem to be the fault. If the transmission fluid level was low, or it was dirty, the autobox would have difficulty in changing gear. It wouldn't cause any vibration problems.
It's very difficult to diagnose problems without actually seeing the car, but .. but .. I would guess that the cause of the vibration is within the transmission .. a loose torque converter or a torque converter problem
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A rough engine idle can come from a variety of causes. During the winter months, cars may have a harder time starting and will shake when first turned on. This form of rough idle can easily be mistaken for other problems. Engine idle problems can also be attributed to malfunctioning components, such as spark plugs. Holes in the air intake valve can also cause a rough engine idle because of excessive amounts of air being drawn in.
The rough idle of an engine can signify a power loss in the car. This loss of power could lead to other problems, such as excessive gas consumption. This lack of power can also lead to additional wear on other parts of the car. Ignoring problems with the engine of can lead to a massive breakdown that will require you either to make costly repairs or replace the car entirely.
I really need to know the mileage.....?..also the question isn't very clear ...Is the whole truck shaking roughly or is the engine shaking roughly or is it both the engine and truck shaking..?..Since I am not sure I will answer what I can....Ok......If the truck is shaking while sitting still at idle the engine/trans mounts could be worn and or loose mounting hardware...If the engine is running roughly at idle causing all to shake that bad it could be a number of things causing it as usual...Quite often a faulty plug wire/and or bad plug will make it have a misfire because it will be running on only 5 cylinders..If that's the case it could be more than one bad...A vacuum leak will cause it to perform in the same manner...however all cylinders will be firing..Normally a vacuum leak is easy to pinpoint..however it could be a faulty IAC valve..(IDLE AIR CONTROL)..The idle air control is designed to hold a high idle at start up then slowly bring idle down to proper Rpm.....A faulty TPS (THROTTLE POSITION SENSOR) will also cause a rough running problem..And let's not forget the O2 sensor..(OXYGEN SENSOR)..The O2 sensor controls air/fuel mixture...and yes an exhaust manifold gasket will make it run rough but not too bad...It has a rough running sound more so than causing it to horribly shake..It will shake but not to bad..
it is located at the exhaust side of engine..The exhaust manifold is mounted to the engine exhaust port..the exhaust pipe is mounted to the exhaust manifold and the muffler/cat converter is mounted to the exhaust pipe...You can check the plug wires quickly..With engine running carefully remove plug wires 1 at a time..If the sound of engine gets worse the wire you removed is good..after verifying it is good or bad plug wire back on then pull the next wire..and so on..If you pull a wire off and there is no change in engine operation that is the bad wire..If that is the case change all plugs and wires...One at a time..(It is a good idea to make sure all wires come off easily before starting engine..old wires will come apart easily..grasp wire tightly at boot and twist left to right while pulling..)as far as the other components I spoke as well as many others,the best,easy way is to have it hooked to a scanner and they can check/test all components for proper operation...Now..If it runs good but is shaking the engine/trans mounts are worn as I stated earlier..any loose engine component will cause an engine shake also but you should notice it at a glance...engine mount bolts/nuts being loose can be tightened without changing mounts if caught in time..Trans could be coming loose.also worn clutch will cause vibration...Send more info and I can guide you to remove and replace any faulty components you may find to save you money.........Brooks/Metalpoet.....
If the shaking has been progressively getting worse i would start by checking the engine and transmission mounts for rips or tears. Smelling fuel and major loss of power would suggest that you have a fuel leak somewhere. The sending unit its self is a culprit that can be hard to locate so if in doubt check it as well.