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#18129 of 19336 Re: Engine ping in 2008 Impreza 2.5i AT (non turbo) [saedave]
Jun 13, 2009 (2:06 pm)
I have a 2007 OBW with the same problem. It has a 2.5 manual transmission and at high loads in 4th and 5th it sounds like the engine has something loose internally. I also own a 2004 2.5 impreza outback sport with a loose manifold and that sound is completely different. When I took it to the dealer, since its still under warranty, they told me they couldn't find anything wrong with it. There is something wrong with it and I will keep taking it back to develop a paper trail of Subaru ignoring a problem. I've owned a lot of Subarus but this is the last one unless the dealer suddenly becomes helpful and fixes the problem.
#18130 of 19336 Re: Misfire [phil2000]
Jun 13, 2009 (7:59 pm)
I very much doubt the problem is a bent valve due to the belt having been off by a tooth.... was it the crank or camshaft that was off? I had a camshaft off by a tooth for 60,000 miles and there was no problem with the valves afterward. I did notice the car ran slightly smoother once I corrected the timing during the next belt replacement, but fuel economy, etc., was not noticeably different.
However, if it was the crankshaft off, it may be more significant because the sprocket is much smaller (and therefore each tooth represents more degrees off on the timing). Just guessing here though....
#18131 of 19336 Re: Word to the Wise-SOA- LIARS & CHEATS [sgloon]
Jun 14, 2009 (3:28 pm)
I understand that multiple chemical sensitivity problem. I live with it. We have an 89 Mazda 323 that had a windshield changed out a few years back which the glass company did not fix the leak when asked to. That leak drips right into the fan system which blows the moisture right into the a/c heat duct system causing a lot of fog in rainy weather. Needless to say, that glass company no longer has business from us.
I am wondering if you might be slowly losing coolant from the heater core or refrigerant from the a/c system. Losses in either of those systems no matter how slow they might be would have me looking right at the evap core or the heater core. The antifreeze and 134a refrigerant will do a number on us if in a breathable vapor form. The real fun part is getting right down to exactly what and where the leak is. This is not a problem that is slowly resolved and will take a good bit of time, patience and experience from the repair tech to correct. He/she will have to be able to carefully think out everything you explain to him and be a good detective. Something few mechanics know how to do.
I suggest you consult with a good a/c tech for the sniffer test for refrigerant. He will need a very sensitive trade tool for this job. One who specializes in rebuilding a/c systems may be best. Good luck on this, since very few people want to pay the real good techs anything. Most techs would rather spend time on easier problems. Here, I have the power to ground and take my time to correct such hard line problems.
Jun 14, 2009 (3:29 pm)
That is correct. One tooth off usually does not bend a valve.
Jun 14, 2009 (3:39 pm)
the dreaded misfire code......could be anything simple from Penzoil Quaker State oil being ran in the engine. Dump it, it causes too much sludge, to spark plug wires on to a valve hanging up at times. Lucas oil made it run better? That sticking valve could be it. Do a leak down compression test. If it fails, change your oil to something like a Wal-Mart brand that does not sludge up. Valvoline is also good for little sludge buildup. make sure the filter you use has a good quality back flow valve in it. A WIX is good for that as well.
If it still fails to correct after a few miles.....100-1000, get ready to do a valve job!
#18134 of 19336 Re: Engine ping in 2008 Impreza 2.5i AT (non turbo) [oldladydriver]
Jun 14, 2009 (3:48 pm)
Interesting.....what do you mean normally aspirated. I thought carburaters were history. Everything I see now a days is fuel injected. If so, the knock sensor is what changes the timing to prevent that problem. Usually if it fails, it throws a code. Then again that is assuming that system works correctly!
#18135 of 19336 Re: Engine ping in 2008 Impreza 2.5i AT (non turbo) [girlcarbuilder]
Jun 15, 2009 (4:12 pm)
I picked up the term "normally aspirated" from the NASIOC board, because that's what the non-turbo Imprezas are labeled - just to distinguish it from the turbos. Had the car to the dealer today for the third time. They continue to assert they can find nothing wrong and they cannot replicate the pinging sound when driving it; however, they did decide to "relearn the transmission." Not sure if that's just a "bandaid" approach. I drove it away this evening; there's still some pinging, not quite as bad, but it is still there. So what's going to happen when the transmission "re-learns" my driving habits? Yes, I would think a knock sensor would take care of this, but evidently not.
#18136 of 19336 Re: Engine ping in 2008 Impreza 2.5i AT (non turbo) [oldladydriver]
Jun 15, 2009 (7:14 pm)
Actually both transmission and engine can be set to re-learn behavours.
If the engine is reset, fuel economy will decrease until the engine re-learns how to minimize its fuel usage.
#18137 of 19336 Re: Misfire [girlcarbuilder]
Jun 15, 2009 (7:56 pm)
I am not sure if you have been reading about this saga (see 18002, 18006, 18015/17, 18085, 18089, 18102/6, and 18124). I have swapped wires, checked compression (18085). What is WIX? Who makes a good filter?
I will reset the codes tomorrow to see what Lucas did for me.
#18138 of 19336 Re: Misfire [xwesx]
Jun 15, 2009 (8:01 pm)
It was the crank. In my post (18085), I had good compression in that cylinder 195psi for two minutes or more.
Can I steam clean the engine and look for oil sepage?
Also, do I need that cover on the bottom of the car? During an oil change years ago someone cut a hole in it. Over time it started breaking apart.