Question about Saturn SL
I also pulled the fuel rail and cleaned the injectors and having the same problem
My 02 did the same thing. If I were you I'd first check for vacuum leaks and check the intake manifold gasket. They are known to go bad.Take engine cleaner, or brake cleaner and spray directly onto the intake while the engine is running. This is right under the fuel rail. Spray and listen for a change in the idle. If there is any change at all, the intake manifold is bad. Spray all vacuum hoses too. If that is not the problem you should clean the TPS throttle positioning sensor, and the AIC air idle control. Also clean the throttle body. These cars are known for this too.. First take off air cleaner hose, and disconnect the battery. On the throttle body TB you will see 2 10mm bolts. Undo them and the throttle cable. Don't lose the metal gasket. Take TB off and look at the back side of it. Is it carboned up? If so, clean with same cleaner making sure the 2 vacuum hoses are clear. Take the AIC off with a #20 torx screw driver. Dont lose the rubber O Ring. Clean it up, but dont try to move the plunger. Clean inside the TB where this plunger seats. Dirt can cause your symptoms. Clean it up good scrapping the carbon off the back of TB. The TPS is right above the AIC and can also be cleaned up a bit. put it all back together and it should run right.It's usually one or the other with these engines, please let me know what your test results come up with thanks
Posted on Jan 21, 2013
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Posted on Jan 02, 2017
Disconnect the battery completely, try turning the key with the battery disconnected. Put the battery back together. The check engine light should be off now..
Posted on Aug 15, 2010
SOURCE: 99 buick Lesabre
hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
Posted on Sep 23, 2008
For old models, Saturn/GM also used the same material
fiberglass gasket in your model, you almost certainly have a leak from
a crumpled, sucked-in gasket as I suffered (and many others). I would
say going to Saturn dealership to make repairs is probably not good
idea if they are going to put in the same GM intake gasket part. Maybe
possible to specify Felpro gasket with whatever shop you go to if you
don't do the repair yourself. I would not go too long with your car in
that condition as there is localized leaning at your cyl-3, that could
cause a burnt exhaust valve there.
The exhaust is extra hot venting out that cylinder. P0303 is misfire at cyl-3. Mine was P0301 (cyl-1). You may get P0507 once in a while when PCM fails to control the fast idle caused by the leak under certain conditions. Most of the time, it is very slow idle caused by 3 cylinders running. You run smoother in cold idle because the IAC opens up to increase idle and end up lowering the manifold vacuum, so the reduced vacuum causes less leaking at the failing intake manifold gasket.
I'd say try cleaning everything with your ignition before replacement; Idle problems could be caused by engine coolant sensor (ECTS). Are you sure it was changed? Did they put on a new wire connector along with it?
Posted on Dec 29, 2009
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
Posted on Mar 05, 2010
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