I had a crankshaft sensor replaced because my truck would shake and rattle then cut off, but even after the replacement it is still doing the same thing. What else could be causing this shaking and jumping?

Hi Willem, Code 18 is a Crankshaft position sensor/Camshaft position sensor............ P0018
Crankshaft Position Camshaft Position/Correlation (Bank 2 Sensor A)
Crankshaft Position Sensor car not starting coil spark

Camshaft Position Sensor P0340 Testing and Replacement HD

You best bet is take to a ASE certified repair shop or a GM dealer ! When replacing crank sensor a special procedure has to be done with a scan tool .
Crankshaft Position System Variation Learn
The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:
?€¢
DTC P1336 is set

?€¢
The PCM has been replaced

?€¢
The engine has been replaced

?€¢
The crankshaft has been replaced

?€¢
The crankshaft harmonic balancer has been replaced

?€¢
The crankshaft position sensor has been replaced
Important: Set the vehicle parking brake and block the drive wheels when performing the crankshaft position system variation learn procedure in order to prevent personal injury. Release the throttle when the engine reaches the SECOND fuel cut off. Leaving the throttle open during the fuel cut-off will allow the engine to decel at an even rate. Once the learn procedure is completed, the PCM will return the engine control to the operator and the engine will respond to the throttle position.
Important: The scan tool crankshaft position system variation learn function will be inhibited if engine coolant temperature is less than 70?°C (158?°F). Allow the engine to warm to at least 70?°C (158?°F) before attempting the crankshaft position system variation learn procedure.
The scan tool crankshaft position system variation learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or during the crankshaft position system variation learn procedure. Diagnose and repair any DTCs if set.
The crankshaft position system variation learn function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 18X reference circuit.
?€¢
If the scan tool indicates a problem with the cam signal, refer to DTC P0341 .

?€¢
If the scan tool indicates a problem with the 3X crank signal, refer to DTC P1374 .

?€¢
If the scan tool indicates a problem with the 18X crank signal, refer to DTC P0336 .

Now why do you want to replace these thing's ? mite be able to save you some time an money. Do you have a check engine light lit ? Codes ? Does it start an run ?

Jeep Crank Sensor Replacement, P Codes P0351, P1391 ...

? 6:24
www.youtube.com/watch?v=7D0vUEDSwXo
May 12, 2013 - Uploaded by Robert DIY Replaced the crank sensor on this 2003 Jeep Grand Cherokee.... to replace my crankshaft position sensor on my 1998 grand cherokee laredo.

Jeep Crankshaft Position Sensor Replacement (CKP, CKPS ...

? 4:07
www.youtube.com/watch?v=1Ho5iAKQV00

Oct 27, 2013 - Uploaded by WeekendHandymen
hi , do you think if I replace crank sensor will solve the problem ,my jeep .... Where's the crankshaft located in 99 jeep grand Cherokee laredo .

The pcv valve will be on the valve cover. It will have a tube coming to it. You can pull it out to remove it. Shake the pcv valve, if it doesn't rattle, it needs to be replaced.

Billy you have the main bearings on the crankshaft, but you said a rattling noise, these pulleys are bolted to the harmonic balancer check the bolts that attach the pulley to the balancer to see if they are tight. Sometimes they can work their way loose. If it were a main bearing the engine would have a slight shake to it or in other words while the vehicle is idling the motor would shake along with a loss of oil pressure on your gauge in the vehicle. By the rattling it can be two things that come to mind either the harmonic balancer is coming apart or the pulley is coming loose from the balance. Hope this helps let me know what you find.

Hi,
Normally, the hot no-start is caused by a faulty camshaft sensor or crankshaft sensor, usually the crankshaft sensor. Another possible cause for the cut out and die when hot can be a plugged catalytic converter or restricted exhaust. If your 11 year old car still has the original converter, I would suspect it (and some times the muffler) could be restricted due to the catalist inside the converter melting down from age and causing restriction. Sometimes particles will travel to the muffler restricting it also. A restricted exhaust will cause back pressure to the engine because exhaust gasses cannot escape at a rate suitable for the engine to run efficiently. Basically, it chokes your engine. Your exhaust can be checked with emmissions equiptment, but if you go under the car and see rust, dents in converter, or can shake it and hear anything rattling inside it, it is most likely faulty. A new exhaust sytem will make a world of difference on how your car runs, including less rough idle, more power and cleaner oil, less plug fouling and emissions sensor(s) fouling.
Check the exhaust out first and see if you have any computer trouble codes stored. Sometimes a downstream O2 sensor code can indicate a bad converter...........Mike

ck balancer on front of crankshaft

Its the crankshaft sensor. this sensor, when bad, will send mixed signals to the engine CPU that will through of timing dramatically. replace the sensor asap.

Check the gound,

My truck was doing the same thing.... replaced the crankshaft sensor first, truck would still die after about 10 minutes of idleing, it back-fired thru the engine and blew off the back of the intake manifold. Pulled the monifold, reglued end-cap and put back in truck. STILL died after idleing for 10 minutes. Code PO320 kept coming up ( crankshaft sensor) researched it and found a bad camshaft sensor can cause crankshaft sensor to act up and give code for the crankshaft sensor. Replaced camshaft sensor and the truck runs like a dream !!!!!! I believe the Manifold was cracked for a while causing the 1299 code reading ( vacuum leak) the back-fire finished it off! I would check the back of your intake manifold for a leak. The combination of fixing the vacuum leak , cam/crankshaft sensors seems to have fixed the problem. GOOD LUCK!!!