My 2002 Saturn SL Silver Blue Special (The $9995 including air special)
has 130k miles on it. At around 80k, I started having a sticking throttle. I cleaned it and it was good to 90k where it started sticking again. Cleaned it again, but between 90 and 102k, the engine started running rough, gas mileage went down (from 38 to 35) and the throttle started sticking again. At 102k, I got a check engine light and code P0507 (high idle). Found the factory had mispositioned the intake manifold gasket (common problem apparantly). I cleaned the throttle body and intake manifold and put on a new intake manifold gasket and new PCV valve. Since then I've had to remove and clean the throttle body about every 5k miles, and it gets worse each time. Today, I cleaned it again and put in another new PCV valve. The backside of the throttle plate is caked in carbon and the intake mainfold passages are getting restricted with an oily carbon. The engine runs fine, idles smoothly, oil consumption is low (qt/3000 miles), fuel economy is 38 or better, a little better due to two speeding tickets last summer. Any ideas? |
Be sure to use Saturn OEM PCV valve -- the after market ones are known to pass way too much oil through.
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Can you tell me more about the misaligned intake manifold gasket? Was it a problem ona 95 SL1? I have a similar problem with sticking throttle and carbon buildup. Thanks!
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An update, I pulled the valve cover to see if there was any sludge
under there, it was clean as a whistle. After puttin g the valve cover back on, I pulled the hose between the valve cover and the air filter runner. I get both vacuum and pressure from the tube. I'm suspecting a small amount of blowby from one cylinder causing the puffing, but I still get a good vacuum from the PVC valve. I guess throttle body cleanings are going to be a regular maintenance item from now on. I checked teh EGR valve and it was clean and functioning. trysten, many people have gotten the P0507 code from their computer when the check engine light came on. Many found out that the root problem was a leak around the #1 cylinder, but most had their mechanic or dealer replace the gasket. I do my own work as much as possible. When I pulled the intake manifold, I found that the hole in the gasket at the bottom outside corner of the #1 cylinder had missed the stud it was supposed to surround. It got bunched up there and eventually got sucked in far enough to cause a vacuum leak, it took 4 years and 102k miles to show up. I'm guessing that that was the cause of the other peoples problem since these engines are built by robots. The sticking throttle and build up on the backside of the throttle plate is apparently due to oil burning, not the intake manifold gasket. The intake manifold gasket problem could have led to my condition by causing one cylinder to run rich as another ran lean. The fuel injection controls are based on the average of O2 in the exhaust, not cylinder by cylinder. The leak would have made #1 run lean, so the others would have run rich to compensate. Saturns have a reputation for oil burning, but I don't see other posts about sticking throttles. It seems that if mine causes the throttle to stick so quickly when my oil consumption is still pretty low, then other Saturns should have been almost undrivable. |
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