Hesitation, sounds like Subaru
#1
Hesitation, sounds like Subaru
My car just started hesitating and it sounds like its running on less than 4 cylinders so I havent been driving it. Today, I changed the plugs, wires, and coils and its still suffering from the same problem. I also flashed the original tune for my car hoping there was something wrong with the tune, but to no avail. Any suggestions before I douse it in gasoline and light it on fire?
#2
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Subies sound badass. You are lucky. wud wud wud wud wud bruuuuuddddddddddddd
Does it sound liek that when revving at idle? Perhaps try disconnecting one plug at a time, rev it, see if it sounds worse. When you hit the plug that does not change the sound, you have the problem right there on that signal path roger wilco.
Does it sound liek that when revving at idle? Perhaps try disconnecting one plug at a time, rev it, see if it sounds worse. When you hit the plug that does not change the sound, you have the problem right there on that signal path roger wilco.
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That indicates that the problem, whatever it may be is centered around cylinder 4. Or I could be totally wrong :|
If you pull the plug for that cylinder, plug it into the wire, and lay it on top of the block, can you see the plug sparking with the motor running (or while cranking)?
If you pull the plug for that cylinder, plug it into the wire, and lay it on top of the block, can you see the plug sparking with the motor running (or while cranking)?
#7
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Have a friend hold spark plug to tongue, crank.
jk
But yes faeflora is correct if you pull the plug and no change in the engine it is most likely an issue with that cylinder. Might not be spark, could be fuel or compression too. But those are all easy to check. Do work son.
jk
But yes faeflora is correct if you pull the plug and no change in the engine it is most likely an issue with that cylinder. Might not be spark, could be fuel or compression too. But those are all easy to check. Do work son.
#8
You may have some water in the cylinders, it sounds like my engine before i found out there was water in the cylinder. You may want to pull the plugs and check the cylinders, if you see one piston that is wet or alot cleaner then the rest then there lies your problem. You may also want to run a leakdown test while both warm and cold and see if you have a loss of compression.
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Compare all four cylinders (spark). Mine did the same, spark on all four cyls but one was much worse than others. It appeared lean on the master wideband, but one of the individual cylinders was waaayyy rich, indicating a problem there. Changed a coil and all was well again.
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Hmm rut roh.
I say switch injector between the possible problem cylinder and another. If it still sounds crappy, pull plug wire by wire again and listen. If the cylinder you switched the injector to now does not affect the sound I would then say it is the injector.
I say switch injector between the possible problem cylinder and another. If it still sounds crappy, pull plug wire by wire again and listen. If the cylinder you switched the injector to now does not affect the sound I would then say it is the injector.
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Also check the gound on the harness on the passenger side in the back neat the back of the engine that the coil and injector harness is gounded to. I would also check to see if the oil or antifreeze has oil/water in it.
#17
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No but you would have to assume if you have fuel preassure witch you do because the car runs, and the fact that the injectors are almost new and not junk ebay, that if there is a signal that it is firing not saying it is a 100% but it is close.
#19
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Hmm. Some inconclusive/incomplete engine diagnosing going on in here.
Spark fires on 1&4 and 2&3. Injectors fire on 1&3 and 2&4. This makes it very easy to diagnoise spark/fuel problems.
I like to take ALL four plugs out, put them back in my COPs (wires in your case), and lay them all on the valve cover. Not only is it pretty in a dark garage, but it tells me for sure if everything is working. Sounds like you've tried something similar, and if you're confident that you did the testing correctly and the spark was strong enough, than your ignition system is fine.
Now, if your ignition system is fine, you need to look at fuel next. You said cylinder #2 IS changing the idle. If this is the case, than your wiring for fuel injectors should be fine up until it splits for the #4 injector, and the #4 injector itself, since both spark and injection are batched fired on a stock ignition and fuel system. Check the harness if you want to, although unless you've stressed it a bunch there's not a huge chance it broke. After that, I'd follow whats-his-face's (don't wanna scroll up) advice and swap injectors, see if it changes anything. Might try your stock injectors if they're still laying around, just don't do any tests above idle, and don't forget to change your req fuel.
Spark fires on 1&4 and 2&3. Injectors fire on 1&3 and 2&4. This makes it very easy to diagnoise spark/fuel problems.
I like to take ALL four plugs out, put them back in my COPs (wires in your case), and lay them all on the valve cover. Not only is it pretty in a dark garage, but it tells me for sure if everything is working. Sounds like you've tried something similar, and if you're confident that you did the testing correctly and the spark was strong enough, than your ignition system is fine.
Now, if your ignition system is fine, you need to look at fuel next. You said cylinder #2 IS changing the idle. If this is the case, than your wiring for fuel injectors should be fine up until it splits for the #4 injector, and the #4 injector itself, since both spark and injection are batched fired on a stock ignition and fuel system. Check the harness if you want to, although unless you've stressed it a bunch there's not a huge chance it broke. After that, I'd follow whats-his-face's (don't wanna scroll up) advice and swap injectors, see if it changes anything. Might try your stock injectors if they're still laying around, just don't do any tests above idle, and don't forget to change your req fuel.
#20
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P.S. I've diagnosed A LOT of 2/3 cylinder issues, so listen to me.
Also, a very quick method is so: If it starts fairly easy except sounds like a Subbie and has decreased power, that's 3 cylinders.
If it starts very hard and has an outrageously low idle and barely has enough power to move itself, that's 2 cylinders.
I don't think our engines will run on 1 cylinder.
Also, a very quick method is so: If it starts fairly easy except sounds like a Subbie and has decreased power, that's 3 cylinders.
If it starts very hard and has an outrageously low idle and barely has enough power to move itself, that's 2 cylinders.
I don't think our engines will run on 1 cylinder.