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Vios 2004 1.3e manula something happen to the engine i'm not sure is it the igniton coil or the gasoline filter (loss compression) 65000km.....

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IF there is a compression loss then have a compression test done to determine if so and which piston . If it is just a miss then isolate each coil until you find the faulty one . If you feel that it is fuel have a fuel pressure test done to determine where the fault is.

Posted on Jul 28, 2013

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skychief2001
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SOURCE: I have a 97 Acura RL,engine light stays on even after O2 sensor is disconnected.I've changed out plugs& checked omhs on coils.Did a compression check on cylinders, 50-80.Do have oil on plugs,

To review, the check engine light will stay on until the problem is fixed and the code or codes are erased. And if the O2 sensor is disconnected the light will stay on for sure.
Do you have the trouble codes stored in the computer ?
FYI - the cylinders should have over 100psi of compression.

Posted on Sep 17, 2012

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SOURCE: I have a 90 Chevy 1500. 305, blew the head

Could be hydraulic lifter is holding valve open. Bring no 1 cylinder to TDC firing Lock engine from turning and with adaptor inject air to cylinder. If air comes out intake manifold then intake valve leaking. If comes out exhaust, you guessed it exhaust valve not closing. If comes out sump then bypassing rings. If comes out of radiator , head gasket leak into cooling system

Posted on Nov 17, 2012

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Loss of mpg on 2006 legacy Subaru


A dirty air filter will prevent adequate air from entering the engine thus reducing gas mileage. Worn spark plugs or a weak spark (defective spark coils) can do the same. A defective "upstream" oxygen sensor (in the exhasut system) can lower fuel mileage. It forces the engine computer to guess at combustion efficiency without feedback from the sensor. It will err on the "rich" side to save the engine, which means it wastes gas. A "check engine" light will be "on" if that is the problem.

In winter, more alcohol is added to gasoline in cold climates to due to the lack of photosynthesis in the region (to make oxygen for us to breath.) Reduced fuel mileage results. Alcohol burns cleaner (and cooler) but it contains less energy (BTU) per gallon than "straight" gasoline. For example, E85 won't take you as far as a tank of regular gasoline.

If your car is designed to use 87 octane fuel, there is no need to use higher octane fuel. Higher octane fuels are for "high performance" engines with increased compression ratios. High octane fuel burns "slower" in the cylinder (to help avoid "detonation") so that the engine can take advantage is its greater compression ratio and advanced igntion timing to make more power. If your Legacy has a turbo, it will likely require the use of premium gasoline to avoid "detonation" under boost. Otherwise, "cheap", 87 octane gas is fine.

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Rough idle low comression #6 cyl


plug, plug wire, coil or igniton module. Check for vacuum leaks.

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Have an optima projector trying to get light bulb out to replace. Removed the two screws like the manual said but plastic cover still won't come off dont want to break it. Any suggestions?


Toyota vios 2004 1.3E manual I've got problem with the engine itself something happen i don't know if it is the IGNITION COIL or the gasoline filter (65000km) loss compression....

Jul 28, 2013 | Cars & Trucks

1 Answer

98 ford mustang spark jumping from coil pack


Hi there:
Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25 percent of the engine power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle.



Basically, it's one of three things: 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 spark plug 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. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak. In fact, if a vehicle has one or more misfire codes and a P0401 EGR code, the fault is likely carbon buildup under the EGR valve.


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.


Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason.




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Thank you for using FixYa, have a nice day.

Jun 18, 2012 | Ford Mustang Cars & Trucks

1 Answer

Spark jumping from coil pack


Hi there:
Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25 percent of the engine power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle.


Basically, it's one of three things: 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 spark plug 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. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak. In fact, if a vehicle has one or more misfire codes and a P0401 EGR code, the fault is likely carbon buildup under the EGR valve.

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.

Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jun 18, 2012 | 1998 Ford Mustang

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I have a 2004 Toyota Vios Soluna. It has 130,000kms and I am wondering if and when I am supposed to change the timing belt? thanks for your help, steve


If it's not specified in the owner manual, and if it's not already been replaced, 90,000 miles (144,000km) is probably the longest you should wait before replacing it.

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My 91 starts hard in the mourning & has loss power all of a sudden. When it starts it takes a while for it to respond to the gas pedal. This happens at a short period of time, Maybe 2 to 3 minutes....


Sounds like you might not be getting enough fuel to the engine. It could be a few things. Spark plugs or coils would cause a loss in power. Check all your wires and make sure they are not damaged. You need to check your engine compression. If it is low, it would cause power loss. Check all your fuses and make sure none are blown. Your fuel filter may be clogged. I believe you have multiple problems. Try to get a code if your check engine light is on. This will point you in the right direction. If not, you need to start checking things one by one. Fuses and fuel filter first. Then check your wires. Check you air filter too. It might need changed. Check all your vacuum lines and make sure you don't have a leak. Do all this first. It is easy to change and doesn't cost a lot.

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Blinking engine light,cylinder 6 misfiring,sputtering , changed w


i would deffently try the carburator cleaner trick then odds are its a vacum problem. also just asking before having replaced the fuel injector on that cyl. did you or the shop use a noide light to make sure it had injector pluse on that fuel injector wiring plug.

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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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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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