Question about 2004 Audi A4

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Loss of power car ticks over ok

Had car checked and was told it was not the coil, that the air & fuel mixtures are wrong ? could be the Air flow meter or the Coolant Temperature sensor.
Problem started when driving at 60 to 70 mph on an incline car would missfire but would run ok otherwise, now the car will start but not accelerate starts ok and runs on idle

Auai A4 1.8 2000

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  • nevlloyd66 May 08, 2009

    no check engine light on

  • yadayada
    yadayada May 11, 2010

    DO U HAVE A CHECK ENGINE LIGHT ON? IF NOT THWERE IS NO PROBLEM WITH FUEL MISTURE CONTROL.

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Had a similar problem before. Change the feul filter. This often fails due to sand in gas and limits gas being pumped into your turbo. If you change this and the cars runs fine, eventually you will have to change the feul pump. Do the feul filter first. It's cheap and easy.

Posted on May 21, 2009

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1 Answer

1992 Buick regal running with miss


I would do a compression test to see if all cylinders are good, and no internal mechanical damage has occurred.
If compression is good, check for possible intake manifold leak that especially affects the right bank- the bank with 1, 3, and 5 cylinders.
No way I can think of that spark would be different on the right bank, so it could be wrong air/fuel mixture for that side, or possible loss of compression that is causing the misfires.

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The vehicle was put on a diagnostic machine for loss of power and it coded the o2 sensor, and the mass air flow, and EGR valve. We put a new o2 sensor in and cleaned the mass air flow. It ran, but no...


no-- but could mean that the O2 sensor is not correct
it is a common misconception that all of the oxygen sensor are the same
the fact is that even they are known a oxygen sensors there are 2 completely different units
the sensor in the exhaust manifold before the cat converter is in fact a heated oxygen sensor and it's function is to report the exhaust composition so that the ecm can adjust the air/fuel mixture
the other is an o2 sensor located after the cat converter and fine tunes the system after the cat converter has done it's job
if the cat converter is faulty , the o2 sensor will try to have the ECM correct the mixture
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My 2001 stratus started but had a rough idle & engine light was blinking on and off.


Hi

Likely one of 2 things

Try the MAF sensor firs, the air mass sensor that measures the right fuel to air mixture, when the go the car chokes on it's fuel or air.

Secondly the EGR valve, you normally would see some power loss though weeks before this would fail, also both of these parts can be cleaned and often work a good while longer, use only carburetter cleaner and do not dry the part after spraying alow to dry naturally normally 5 minutes, if you need more info get back to me
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Turns over but wont start


OK three essentials for a running motor......

1. Fuel - Check to ensure you have gas up to the engine. Check fuel filter, fuel pump and fuel injectors.
2. Spark - Make sure your system has electrical current to fire the plugs. Check your wires to the coil(s) the plug wires, cap & rotor and spark plugs and gaps.
3. Air - Check to make sure any air flow sensors are connected, most cars wont run with the MAF (Mass air flow) sensor disabled. Check your air filter to make sure its not dirty. if it is it can restrict air flow and cause your motor to flood its self out instead of allowing the gas to ignite, hope you found my answer helpful!

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Loss of power on and off through gears


check throttle position, O2 sensor for air/fuel mixture, fuel injectors for clog, spark plugs and coils.

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My 1997 hyudai accent has a missfire code on cylinders 1 and 4 car has no power replaced plugs only change is the idle is much smoother. what else should i check


Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

Aug 25, 2009 | 1997 Hyundai Accent

1 Answer

Engine light has come on and car is misfiring, loss of power, sounds rough


Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

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What causes a misfire on a 99 pontiac grand am if spark plugs or good and the car does not have wires


here are the common causes of a missfire, defective ignition coil or ignition coil wiring for that cylinder, defective fuel injector, defective powertrain control module, intake manifold vacuum leak, low cylinder compression.

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1996 disco 1 misfire error codes 313 and 316, bank B.


Could be, but more likely to be fuel. Why do I think that? Carbon build up typically happens when plugs are working (no carbon without fire) but fuel mixture is wrong (air or fuel). If coil, most likely would misfire at all engine RPM, not just low RPM. So, I reckon to look at fuel rail pressure to the injectors first - get a pressure gauge on the fuel rail and check it out. I think, but can't remember for sure, that there is a fuel pressure regulator per bank, but I could be completely wrong. But either way, I'd check that out as it is simple and if it is OK, then check out air path to that bank and any vacuum/air take offs specifically to that bank. If all OK, then why not swap coils? See if problem swaps over. If so, you know it is the coil.

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