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First some info about the car. 2000 Chevy Cavalier Z24 2.4L with 4T40E transmission. 155,000 miles on the car. There are no problems with acceleration or maintaining speed. Engine idle does stay high if you are driving and put it in neutral. RPM’s are higher the faster you are going. A week after I got the car it gave a code for a bad knock sensor. I don’t remember what the code was. Knock sensor was replaced and code never came back. The only code I get now is P0300. I replaced the spark plugs with NGK Laser Iridium plugs. The idle was still bad and still getting P0300. I was going to clean the EGR valve today. The car doesn’t have one. I found what looked like a mounting location for a part that is no longer installed. It is on the front of the block on the drivers side. there are 3 holes for bolts to go in and one hole that is about 10mm wide that goes into the block. I have found and fixed several vacuum leaks already and used brake cleaner to find any that are left with no luck. The car looks like it had been sitting for a few years so I planned on replacing parts to avoid any future problems. I started with the IAC and TPS. It looks like the camshaft housings were both removed at one time due the all of the blue “gasket” oozing out where a real gasket should be. Recently changed the headlights and found out they were not even the correct bulbs. On top of that they were being held in with zip ties. I am not looking forward to finding the next “repair” the previous owner made. Any help I can get would be greatly appreciated.
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Sounds like there’s plenty going on with this car. That said, I would focus on the vacuum leaks for now. There are many methods to do this which have been brought up. All you really need is a spray bottle with water. More information can be found in this article that may help.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Keep us posted.
Yes it does have a lot going on. After drenching every place there is vacuum with water I didn’t find a single vacuum leak. The noise I thought was a leak turned out to be the power steering pump. I still had some daylight left so I decided to check the coil housing. It looks new and has no damage. So I took it appart to check the coil packs. One of them has a crack in the side. Would this cause the coil to fail. Never had any coil problems on previous vehicles. I included a pic of the coil.
I purchased a car like this and did wind up finding out that the third cylinder was dead. the ignition module was checked good and so was the fuel. there was a problem with the wiring harness that was in the car, but that wasn’t the end of my issues the timing chain in the car had stretched and jumped to so just be careful as just a warning. mine had the same mileage to.
Yeah with the mileage on the car the timing chain keeps popping into my head. I had read somewhere when they stretch the timing retards at low RPMs. This would cause a rough idle. I’m hoping that is not my issue. Thanks for the heads up.
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