Question about Saturn SL

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2002 saturn sl1 rough idle,misfire,popping sound from exhaust. replaced fuel pump,fuel filter,plugs and wires no help

I also pulled the fuel rail and cleaned the injectors and having the same problem

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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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SOURCE: 2002 Ford Taurus SEL, DOHC Misfiring

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

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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

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SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

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SOURCE: 2002 Saturn SL1 check engine light code P0303

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?

Hope helps.

Posted on Dec 29, 2009

  • 77 Answers

SOURCE: 1996 Honda Accord Rough Idle Even After tune up

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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2004 isuzu rodeo 3.5l fuel injector removal instructions

no job stated, just 1 injector,? pull?
which bank or both, matters........
same as all fuel rail injectors.really....cept access.

1: do the fuel depressurize steps in the service manual.
2: battery neg lug off.
3: gain access to the rail. (obvious , sorry) intake man pulled!
remove, fuel line and cross over,fuel lineis on right bank only.
4:remove the injector connectors, or if one,just one.
5: remove the injector rail 3 rail bolts or 6 if both banks.
6: they are now free.
this one photo makes it obvious.... no?
you must get to here.

26342320-derva1l3mlhtf5qz32ooabpo-5-0.jpg to depressurize,
pull fuel pump relay as step 1
crank engine , let it stall from fuel,
then do it.

Nov 05, 2016 | 2004 Isuzu Rodeo

1 Answer

How do I remove and clean a fuel injector?

You have to remove the fuel rail from the engine. Then you can pull out all of the fuel injectors to clean them. Most tune-up shops offer a fuel injection cleaning service that doesn't require removal of the injectors. If your car has high mileage, you can get some extremely good deals on brand new injectors from an on-line retailer, like Amazon.

Oct 18, 2014 | 2001 Buick LeSabre

1 Answer

Got some bad gas, changed filter and plugs, one cylinder studders and fouls out plug. im thinking maybe clogged injector?

check you have pushed down the rubber boot that covers your remove your injectors care needed .due to risk of fire. put cloths under your fuel rail.take off your battery lead.remove the bolts on the fuel rail.pull off the clips holding the injectors to your fuel rail. now pull up the rail.your injectors should lift off at the same time.they are being held on only by an O twist and pull them out.then fallow the procidure for cleaning them.or send away to be cleaned.

Dec 06, 2013 | 2001 Oldsmobile Alero

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How can you tell if you need to put fuel injector fluid in car 2009 chevy impala

You never need injector additives. Injectors move, so are self cleaning. Put a pressure gauge on the fuel rail, and if it is low, replace the filter. If it does not hold some pressure when you turn it off, and it keeps dropping to 0, then you have a leaking injector that needs to be replaced. You can pull all the injectors while still attached to the fuel rail, and you can see if they have the right pattern or drip.

Feb 13, 2013 | Cars & Trucks

2 Answers

I need to replace the #2 fuel injector. Is this something a layman such as I can accomplish?

You could do it, but remember gasoline is flammable and volatile and can be hazardous to work with: REMOVAL AND INSTALLATION 1.9L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Properly relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clip off the injector
    • Fuel injector
    • Fuel injector O-rings and discard them Fig. 1: Fuel injector identification-1.9L engine 9306zg58.gif
    To install: NOTE: The SOHC and DOHC fuel injectors are not interchangeable. The injectors are identified by a color coded plastic ring near the bottom of the injector. The SOHC injector has a blue ring near the O-ring that mates to the intake manifold and the DOHC has a pink ring.
  4. Lubricate the new fuel injector O-ring with clean engine oil.
  5. Install or connect the following:
    • New O-ring seals on the fuel injector
    • Retaining clip to the fuel injector
    • Fuel injector to the fuel rail
    • Fuel rail
    • Negative battery cable
  6. Start the vehicle and check for leaks, repair if necessary.
2.2L and 3.0L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Properly relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable
    • Fuel rail
    • Fuel injector retaining clip off the injector
    • Fuel injector
    • Fuel injector O-rings and discard them
Fig. 2: Remove the retainer clip from the fuel injector - 2.2L and 3.0L engines 9306zg59.gif
To install:
  1. Lubricate the new fuel injector O-ring with clean engine oil.
  2. Install or connect the following:
    • New O-ring seals on the fuel injector
    • Retaining clip to the fuel injector
    • Fuel injector to the fuel rail
    • Fuel rail
    • Negative battery cable
  3. Start the vehicle and check for leaks, repair if necessary.
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Feb 14, 2011 | 1999 Saturn SL

2 Answers

I need to change out the fuel injector oring my car has gas coming out of one of them and i bought the stuff just need to know hoew to do it

you unbolt the entire fuel rail from the intake manifold and pull it up gently. You can leave the rail connected to the fuel supply hose. You may need to remove the connectors as well to get it up high enough to change the o-rings. use a little oil or grease on the orings to slip them back in the same way you pulled it out. If you have more questions, let us know.

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Changing a fuel injector on a Toyota Carina 1996 1800, anyone have an idea how to change before I start?

Disconnect the wiring plugs from the injectors, Then remove the fuel rail (which is attached to injectors). Then remove injectors from the fuel rail. Don`t forget to change the "O-rings", (little rubber things on the end of each injectors). Otherwise there`s a possibility of fuel leak.
Also I suggest trying to clean the faulty injector at first, It might be ok, just dirty inside.
How to clean: Use injector cleaning fluid on the end of the head of the injector. Attach minus and plus to the contacts of the injector to battery of the car or any other energy source, and start pulling the negative wire on the battery on and off. You should hear clicking sound in the injector. Use the fluid and this "technique" for couple minutes or more, until the injector starts spitting the cleaning fluid evenly, not rarely. If still the injector doesn`t spit the fluid, you might need to change it.

Hope this helps, sorry for my english. I`m a lithuanian

Feb 16, 2010 | 1996 Toyota Camry

1 Answer

1998 Audi A4 1.8l

Nope - pretty much every system I've seen requires removal of the rail and all injectors as a unit, and then individual disassembly of the injectors. Honestly, with an 11-model-year-old car, if you're going to remove that injector (which, by your other post, you don't have a choice), it's worth the time and relatively low cost to replace all of your O-rings for peace of mind. You can soak the rail and injectors with penetrating oil to help free them up, and then clean and dry the rail and ring seating surfaces before installing the new O rings and injectors. You're going to enough trouble as it is - might as well be thorough and handle any future fuel leakage now before it's an issue and requires another removal of the rail.

Sep 18, 2008 | 1998 Audi A4

1 Answer


you just need to remrber at the top of the injector is the fuel rail. that is what hold the injector in place. also remember that the fuel rail has pressure . so you need to be careful . also this area need to cleaned with air pressure . just remember the bottom of the injector sticks right into the intake manifold .there are a couple of bolt that hold the fuel rail in place. remove the bolts and pry off the rail. there is a special oring on the top and bottom of the injector. some times they will come off whenyou pull the injector. so make sure you know where these are at. if you loose one or if they are in bad shape auto part stores have these.. switch your injectors. when you stick the injectors back in you have to pull every injector on that rail. and lube the orings so they will slide into place.
its realy not to hard just takes time and need to be clean good luck.

Aug 31, 2008 | 1999 Buick LeSabre

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