Question about 2002 Saturn VUE

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Car misfires at times.

My car has a 2E Engine, it misfires at times with backfiring from air cleaner and there is poor Idling.

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  • Lackson Tembo Jan 28, 2009

    There is some improvement only that it now miss fires when the Engine is cold with some pops from the exhaust. after heating up, its fine.



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Try giving it a tune up, change the spark plugs and adjust the timing belt.
Let me know if this helps.

Posted on Jan 25, 2009


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Our oldsmoible silhoute has had many issues , we have spent $1800 trying to fix it

A backfire is usually an indicator of either timing or vacuum. Though you didn't include the year or engine size of your vehicle, the timing is not adjustable, and more than likely NOT your issue. This brings us to what it most likely is: Emissions System/ Vacuum/ Air Induction. The slower your vehicle goes (the less open your throttle is) the MORE vacuum there is present in the intake manifold. The faster your vehicle goes ( the wider open your throttle is) the LESS vacuum there is in the manifold. When you open your throttle, it lets more Air into the engine, which, in turn, displaces the vacuum. A vacuum leak allows air into the engine, which replaces the much needed vacuum for the car to run properly at idle and lower speeds. But when the vehicle is driving faster, the symptoms of the vacuum leak may not be noticeable, due to the fact that the engine is utilizing the extra air intake. The symptoms, however, return when the vehicle returns to idle. Using a 3/4" hose, you can put one end of the hose to your ear and probe the engine with the other end. Using the hose a stethoscope, listen for any "hissing" sounds coming from the intake or hoses, to detect a vacuum leak. Spraying Brake Cleaner / around the manifold, while the car is parked and idling, and listening for the engine to surge as the Brake Cleaner is being sucked into the engine, is one method that can be employed, though, I must say, with extreme caution. An open spark plug wire can cause the spray the ignite! There is also the option of having a smoke test done by a qualified technician, to locate a leak.
An Engine backfire is merely a condition where the cylinder in question has a poor air /fuel and spark ratio or timing. A leaking Fuel Injector can cause a backfire as well, such as the backfire that is present when too much starter fluid is used. First: get the codes pulled for your Check Engine Light for free at Autozone or Orielly's. Look for O2 sensors to be reading a Lean condition , which indicates a vacuum leak, or not enough fuel ( as in clogged injectors) if it a clogged injector, the code should say "misfire" and indicate which cylinder(s) has the issue. If the code has O2 sensor "Rich" condition, you are looking at too much gas being dumped into one or more cylinders, or not enough air. Though, by your description, it is more than likely a mere vacuum/ air issue.

Oct 18, 2016 | Cars & Trucks

1 Answer

Why is my 1999 Chevy Tahoe backfiring?

Hi Dion:
When under acceleration, an engine experiences increased cylinder pressures. If you have a spark plug(s) that is in poor condition, it can misfire (or not fire) then, so the unburned fuel will ignite in the exhaust, and "backfire".

Another possible cause could be that the timing is not retarding when the vacuum drops under acceleration.

My recommendation?

Aug 08, 2015 | Cars & Trucks

3 Answers

My 94 Toyota Camry 4 cyl is running really rough and stalling out once the engine warms up

1. Error Code 24. Intake Air Temperature Sensor.
Check the following:
- IAT Connector and wiring.
- Intake Air Temperature Sensor.
- Engine Coolant Temperature Sensor.
- ECM.
2. Rough Idling when the engine is hot.
The following are the reasons due to which the engine can perform bad when it is hot.
- Fuel pump control circuit.
- Fuel pump pressure.
- Fuel injectors.
- Non Return Valve clogged, located on the lower side of car chassis above the fuel tank.
- Engine compression, valve clearance, spark plugs.

Apr 14, 2014 | 1994 Toyota Camry

1 Answer


Timing is off,problem with timing chain,also check fluids in ******,plus also if you have a distributer in your vehicle,if it is cracked,moisture getting in and ruining the points,-that is if your vehicle has a distributer! This will make a vehicle run rough as well.
You can have new plugs put in,but if your spark plug wires are cracked or worn,this will also creat misfire and backfiring.

Jan 25, 2012 | 2000 Chevrolet Blazer

1 Answer

Backfire, rough idle, poor fuel milage

likely it is the computer check your codes

Jan 02, 2010 | 1996 Plymouth Neon

1 Answer

Popping/backfiring thru intake under accel

Well that car is a obd1. There are many issues that can cause that. A engine that usually misfires or surges under a heavy load or at higher speeds usually indicates it is starved for fuel. I would for sure change the fuel filter if has not been done in last 30,000. I would check fuel pressure and fuel volume. Yes the converter that is clogged causes lack of power, misfire, and poor fuel economy. If the converter is clogged well you still have to fix the problem that caused converter to clog, which is usually an overly rich air/fuel mixture. Most the time it gets clogged due to a bad spark plug, wire, or valve not seating causing raw fuel to enter the exhaust system. I would first check the basics look for any vacuum leaks check the plugs see if they are black and dry (carbon fouled) from to rich fuel mixture, caused by weak ingition, dirty air cleaner, defective fuel pump, e.t.c. or if they white or gray insulator with black or gray brown spots, from low fuel pressure or incorrect timing e.t.c. If you dont find any vacuum leaks bad plugs clogged air cleaner then you need to check the sensors map, mass air flow, etc. I would check your check engine light, when you first turn the key to the on position it should light up, if not than its burnt. Computer codes make diagnosis alot easier. If you can get the codes if it has them let me know. Most exhaust shops will check converter for free. Hope this helps you get a understanding.

Jul 25, 2009 | 1997 Oldsmobile Aurora

1 Answer

Eratic idling and misfiring under pressure

confirm that the fuel pump delivers the proper pressure to the injectors

Mar 08, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

The Car is very slow on take offs like I stop at traffic lights and it has no power to move off. I've had to have a camshaft sensor replaced that got the car going again but the engine symbol is still on...

this seems to be a misfire problem due to poor A/F ratio, affecting camshaft sensing, try to clean up the intake manifold while engine is idling, use a combination of a good carburator cleaner plus a penetrating agent, remember, spray this combination into the throtle body during engine running state while vacuum is created into the intake system.

I hope your problem is solved this way, regards.

Jul 17, 2008 | 2007 Toyota Yaris

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