faris_jason Posted May 18, 2008 Report Share Posted May 18, 2008 I have been noticing some heavy idling. I recently performed a major tune up. Is there anything else I can do to stop the heavy idling? Link to comment Share on other sites More sharing options...
JimD Posted May 19, 2008 Report Share Posted May 19, 2008 Not familiar with your choice of words. Exactly what do you mean by "heavy idling"? Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
adallak Posted May 19, 2008 Report Share Posted May 19, 2008 What is exactly a major tune up? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
faris_jason Posted May 19, 2008 Author Report Share Posted May 19, 2008 When I am sitting at the light I feel my engine knocking. Dont know wht wors to use. Its not smooth untill I accelerate. Just had my sparks plugs changed, changed my fluids and added a fuel additive. I felt this issue before the tune up. I thought the tuneup may help but it did not. Link to comment Share on other sites More sharing options...
TDK Posted May 19, 2008 Report Share Posted May 19, 2008 jeezy112 Please check your car's diagnostic codes and report them to this site. Following is a how-to: http://www.caddyinfo.com/readingcodes.html All the dash lights will test and certain codes might display. There may be both current and history codes to note. Generally speaking, fuel additives have not proven to improve any engine condition and can damage the fuel pump. Perhaps you could note what you used. How did the old plugs look, (platinum pads on yet, sooty?), how many miles on them? Most importantly, what plugs did you install - hopefully original GM. What is the RPM at idle? This can be checked by stepping through the INFOMATION button. One way to check a significant knock, (if suspected at a piston/rod bearing on one cylinder), is to disconnect one spak plug at a time. However, this will also cause a rougher idle and may confuse the issue. Have you or anyone else listened to other areas of the engine bay for the source of the knock? It may be as simple as an exhaust pipe bumping on the body/frame. How many miles does this engine have and do you know of any major repairs? Good Luck. Add power to leave problems behind. Most braking is just - poor planning. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted May 19, 2008 Report Share Posted May 19, 2008 For a knock that is not a pre-ignition knock, first check the motor supports. the front one is the most likely to go, and the torque wishbones on top of the engine on each side that link to the radiator supports are next. If the rubber is knocked out of either torque wishbone, change them both; you can do it yourself in a few minutes. The front lower motor support is best changed by a mechanic with the car raised on a rack. If you have a knock at idle but not when driving, a good candidate is cross-firing between the plug wires, or even plug wires connected to the wring cylinders. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.