I did a Dianostic test on my 1997 Max. I performed it myself. I got codes 5/5 meaning that there's nothing wrong with my car. My car is serging (Is that how it's spelled). When I come to a complete stop it shakes like hell. I was told it might be a sensor dirty. My question is this if I take it to a shop and they get the same codes and tell me nothings wrong What's next?

 

Diagnostic Trouble Code 0505 is "All Clear". It means the Engine Control Module is working and no trouble codes have been set.

However, Diagnostic Trouble Code 0505 does not mean nothing is wrong with the engine. All it means is that the Engine Control Module has not recognized a problem. There are some aspects of engine operation which the ECM does not check and therefore cannot diagnose. One good example is fuel pressure. There is no fuel pressure sensor, so there are no "low fuel pressure" Diagnostic Trouble Codes.

Has the Check Engine Light ever turned on?

What is your odometer reading?

Have you performed all scheduled maintenance?

 

The "shakes like hell" symptom could indicate an engine miss, possibly caused by a sticking fuel injector. There are two tests the home mechanic can make, the sound test and the resistance test.

Sound test...
This test is performed with the engine idling. Use a mechanic's
stethoscope or a length of rubber vacuum hose, and listen to each injector.
All injectors should sound alike. If you find one which makes a different
sound (or no sound at all) you have found a problem.

Resistance test...
This test is performed with the engine off. Use an ohmmeter to measure the
resistance of each injector. This does not require removing the injectors.
I don't know the correct resistance value for the injectors on your model,
but they are typically a low number such as 16 ohms. The important thing
is they should all be equal. If you find one injector with substantially
higher resistance than the others, it is bad. If you find one with zero
ohms (short circuit) that is truly unfortunate, because the injector is bad
and it may also have damaged the Engine Control Module (the computer)
because of excessive current drain.

Measuring the resistance of the front bank of cylinders is easy because the
injectors are in plain view. Disconnect the injector electrical connector
for cylinder #2, measure the resistance, reconnect the connector. Repeat
for the cylinders #4 and #6.

Measuring the resistance of the rear bank of cylinders is almost as easy,
but it is difficult to reach the injectors. The resistance may be measured
at a conveniently located electrical connector. Notice the largest,
thickest electrical harness at the top of the engine. This is the Engine
Control Harness and it is shaped like a U, with the open top of the U at the
driver's side of the car. The U has two corners. Look at the corner
nearest the passenger seat. Just inside that corner you will find an 8-pin
electrical connector. This is connector F131. Disconnect this
connector. Now look at the male part, the connector half with the pins
exposed. They are arranged in two rows of four pins.
The pins are numbered 1 - 4 (top row) and 5 - 8 (bottom row).
Measure the resistance of:
- injector #1 between pins 1 and 2.
- injector #3 between pins 1 and 6.
- injector #5 between pins 1 and 5.
Be sure to measure the PINS, not the female receptacles.

The dealer's shop is equipped with high-tech diagnostic instruments. These are wonderful devices but they are expensive and the dealer has to recover his cost by charging you for diagnostic time. Sometimes the home mechanic can do legitimate diagnostic work with nothing more than a ohmmeter and a rubber tube.

 

The suggestions by DBM are good.

Another suggestion would be to check for a cracked or damaged engine mount. A failing engine mount could cause vibrations to be transmitted into the passenger cabin.

 

Thanks alot