Northstar Engines and System Technical Discussion Discussion, 2001 cadillac deville small hesitations in Cadillac Engine Discussion; About 200mi ago i replaced the plenum,intake gaskets, spark plugs, upper and lower crank shaft sensor. The plenum had a ...
About 200mi ago i replaced the plenum,intake gaskets, spark plugs, upper and lower crank shaft sensor. The plenum had a small tear and the car was shiftifting a little hard.Anyway the problem is while Im driving through town, maybe 35 or 40 i can feel little small jerks, nothing major, but i figure it will get worse.Its not sending any codes, or running bad otherwise. Thank you
Read the thread at the top of this forum's main page: "How to pull codes" and learn to use your car's built-in Diagnostic Trouble Code system. You don't need outside scanners or help. Use the URL in the thread which has "obd2" (OnBoard Diagnostics -II protocol) and write down your DTC's. Note whether each is Current or History. Then use the same link to decipher the P, B, U, and C code meanings.
Codes are hidden until you open the system - DIC messages are not the same.
I had a very similar sounding problem. Try disconnecting the EGR. It will throw error codes. But it may make the "hesitations" go away. Replacement of the EGR is simple and expensive. So make sure it is really the EGR. Also, the EGR system is extremely dirty. Try cleaning the EGR valve if it is the problem.