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I had a similar problem on a 2004 Jeep Grand Cherokee V8 engine.
Nothing seemed out of the ordinary except that occasionally the engine would run rough. Another seemingly unrelated symptom was that when shifting out of Park the transmission would sometimes jolt.
Turns out that I had a bearing on the serpentine belt tensioner that was freezing up. My belt broke and while I was changing the belt the pully on the tensioner fell into my hand. The bearing had seized and the plastic hub had disintegrated. After getting the new tensioner and belt. I noticed that the rough engine and the hard shifting transmission problems have gone away.
Seems that the engine was having to work harder to overcome the bad bearing.
Another cause of rough engines comes from dirty fuel injectors. The best solution I have run across is Chevron's Techron fuel additive. I had a honda Prelude that had a rough running engine. The Honda technician advised me to start adding Techron when I fill up. Worked like a charm. After the second tank I had no more problems. I have tried other fuel additives over the years, but Techron seems to be the best.
Also be sure to change your fuel filter. A dirty fuel filter will cause a noticeable drop in power.
Sounds like possibly more than on problem, crankshaft position sensor, or ignition module likely on starting prob which maybe affecting shifting due to hard code in ecm, or shift prob could be shift solenoid in valve body of transmission. Both parts readily available from local parts store
A rough shift can result from the vehicle running rough. Lack of power and a vehicle running rough can be caused by one of two very common problems. One is a leak in the air duct between the air filter and the throttle body. The other is a leak from rubber hoses connecting the intake to the PCV valve at the crankcase causing a vacuum leak. More serious problems such as a misfire from a bad coil pack or a blown head gasket can also cause the vehicle to lose power and run poorly but these are not as common.
A rough shift is exactly what it implies.The shifting of gears should be a smooth transition. Rough shifting causes jerking, gear chatter, and undue strain on the components.
ok, i tell you 3 possible causes.
check maf sensor connection , check fuel pressure regulator (max press fuel in rail 40 psi) , check engine compression (min 95 psi ) if less this cause spark plugs wet and not start
electronic Tempture Control ECT sensor symptoms Potential Symptoms
Symptoms of a P0118 could include:
* Very poor fuel economy * A no start condition * Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring * Illumination of MIL EGR valve
Usually a fault in the control circuit, will leave no noticeable symptoms other than the Malfunction Indicator Lamp (MIL) illumination. However, if the EGR control solenoid is stuck open due to debris, etc. the code may be accompanied by misfire under acceleration, rough idle, or engine dying altogether.
is your car low on coolant? is the water pump bad? and if you have driven it for long while overheated you may have blown a headgasket causing coolant to enter the combustion chamber and causing it to run rough and eventually ceise up.
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