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Location:
tas
Registered:
June 2002
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Are these signs of bad engine timing?
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Wed, 26 November 2003 10:09
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Doesn't rev smoothly, like it occasionally misses, not often but it sounds like it misses. Also you rev the engine then let go of the throttle and it sounds like it backfires (not a loud backfire) Fuck it's hard to explain, it just seems like it shouldn't be doing it.
The exuast has watery black sooty shit dripping out, does this mean it's running too rich?
also I noted my exuast had a big dent in it! It's located just before the muffler. Must of been from driving down my rocky dirt road. This ain't good for a turbo motor! It's like blowing thru a straw that has been kinked/folded.
It's hard to explain, so here is a 3d pic i whipped up in 4mins flat.
The dent is actually abit bigger than what i've done in 3d.
Could this dent be causing the odd backfiring noises?
does my ignition timing sound out? any other advice would be great.
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Location:
Brisbane
Registered:
July 2003
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 10:41
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The dent won't cause your engine to miss.
It could be fouled spark plugs, dirty/clogged injectors.
Is the watery black soot when you first start it up?
In that case it's just moisture, no need to worry.
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Location:
tas
Registered:
June 2002
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 10:50
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well the slight missing leads me to believe it's timing, the dent in the zorst could be nothing at all, just abit more restriction.
I just replaced the spark plugs (last month) which leads me to another problem i had a few months back. After boosting, my engine started misfiring real bad. turns out my number 2 sparkplug got comrpressed! the contacts were touching, no spark. My only explanation for that could be detonation? does bad timing cuase detonation? engine (7mgte) is stock by the way.
yeah your right with the black sooty shit, it's only after i start the car first thing.
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Location:
Brisbane
Registered:
July 2003
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 10:58
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Can you hear the car pinging?
Just because it's got a knock sensor (two of them actually) doesn't mean the car won't ping.
Maybe you could try running the subaru upper engine cleaner through the engine, it's the best stuff for cleaning out all your valves and ports etc... could be a blocked/sticky valve.
Don't be afraid of it having Subaru on it, it's good stuff, like the Toyota red coolant, its the best coolant and I'd run it in everything.
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Location:
tas
Registered:
June 2002
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 11:14
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well the engine is noisy that's for sure, the injectors probably make alot of the noise, but all my valves are noisy and rattly too, not smooth like i'd expect a toyota engine to be (18r seemed alot smoother). A sticky valve is very likely, a few mechanic friends have mentioned that too me.
I might give this subaru stuff a try.
I guess really it comes down to my engine while bieng low milage, must have had a flogging from the previous owner, the crack pulley shakes like all hell, and it just feels like the whole engine could be alot smoother. 
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Location:
Brisbane
Registered:
July 2003
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 11:28
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Hmm, could be worth giving it a full service, change all the belts, oil, filters, coolant etc.
When you put the Subaru upper engine cleaner through don't be suprised when your car is as smokey as a Mitsubishi Colt. It's designed to do that. It'll come good.
Your engine mounts could be shot and causing the chassis to vibrate.
How many k's on the car? And do you trust them?
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Location:
tas
Registered:
June 2002
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 11:43
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well most of the full service things i have done(including a head re-torque to 68lb), except for coolant, a few filters and timing.
The harmonic balancer might be making the crank wheel shake so much? i'm not realy sure, as it's new to me still :(-
Car has 145,000K's on the speedo. Had 2 engines in it previously, so i would of expected the current engine to have low Km's, maybe it was and old piece if crap when the previous owner put it in? and by old piece of crap, i mean thrashed/clapped out.
i will just drive it until it drives no more, and then get another new 7mgte to stick in it's place. or a 1jz if the conversation isn't too much for me.
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Location:
Brisbane
Registered:
July 2003
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 11:46
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May be worth taking to an experienced mechanic, just so see if they can take a look at what it is.... Ask for a quote on getting the car to run smoothly... That's a free diagnosis on what's wrong, then you can fix it yourself.
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 11:52
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If the crank pulley wobbles like crazy, check that it's properly secured on the crank, it may have sheared the key that holds it fixed on the crank shaft. Try loosening off the belts running of the pulley & see if it's loose at all. This will really make the motor run shit.
I went through it, and after replacing the timing & crank pulleys & key & belts & bolt etc gained some suprising power.
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Location:
tas
Registered:
June 2002
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Location:
Adelaide, SA
Registered:
May 2002
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Re: Are these signs of bad engine timing?
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Wed, 26 November 2003 23:59
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If your crank pulley is wobbling around you need to get it fixed ASAP. Otherwise as Joel said it will wear the keyway (a groove in the crank that the woodruff key (like a thick metal semi-circle) fits in and the pulley slides over that). If it gets really buggered you can only fix the keyway by getting a new crank!
The same thing happened in my 7m-GE and I ended up replacing he engine (with a 1j  ).
A loose crank pulley is apparently a common problem with M series engines.
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