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Old 06-20-2004, 09:44 PM   #1
Brian204
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Member#: 56528
Join Date: Mar 2004
Vehicle:
1989 GL
white

Default knocking

Ok, i'm a college kid, who dearly loves my Subaru, and i don't have lots of money to spend on my car. But it has developed a knock in the past few years. ( It's a pinging sound when under load, more noisy or less depending on how hard i hit the pedal- i assume this is knocking. ) I've run it this way for about 30k miles (there are currently 210k on it), driving it gingerly when under acceleration and using lower gears more often. I don't want to crack the cylinders or do any further damage to the old gal, but I don't have a lot of money to splurge on it. I assume advancing the timing is what needs done? How costly would such an adjustment run, and are there any other possible remedies? I've used higher octane gasoline, but it isn't effective enough for the extra cost. Hope to hear from y'all.
Thanks
Brian
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Old 06-21-2004, 12:00 AM   #2
Flowmastered87GL
WCSS Drunk
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Location: Portland Oregon
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2005 Baja Sport
Regal Blue Pearl

Default

Pinging could be due to the timing being off, do you know if its set correctly?

Knocking COULD be the lifters (clattering), or the engine could be toast. When is the last time your oil pump was resealed? (mickey mouse gasket)

Are you running 20W50? or 10W30?

20W50 sometimes helps to reduce clatter.
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Old 06-21-2004, 01:01 AM   #3
Calebz
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1996 GrandCherokeeLimited

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-If its pinging, timing could be too far advanced, there could be crap buildup in the combustion chamber, causing predetonation..

-Treatment: Fuel system cleaner (MMO, STP.. somthing lik that) Timing check ($15 for a cheapo timing light and 10 minutes of your life.)

-If its ticking.. not really anything to worry about.. could be crap buildup in the lifters or oil pump seals sucking air.

-Treatment: Sludge cleaner in the oil (mmo, seafom green.. however, beware, if you have oil leaks, this may make them worse).. possibly a reaseal of your oil pump.

If its knocking.. well.. thats usually a bad thing and by the time a real 'knock' starts, you're pretty well screwed.

Whats the treatment for being screwed?
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Old 06-21-2004, 11:13 PM   #4
Brian204
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1989 GL
white

Default

Well, like i say, i've been running it this way for about 30k miles, hasn't gotten necessarily better or worse...so i suppose it isn't the real "knock" you guys talk about...I'll look into fuel/oil treatments first, and work up from there...I've been using 10w40 'high mileage" oil, whether its worth its salt, but 20w50 is worth a shot too. I've heard you guys talk about hydraulic lifters being a pain on those EA-82s, are they more susceptible to gunk buildup or is it a different problem?

Anyway, I'll check into these and get back with you.
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Old 06-21-2004, 11:40 PM   #5
DerFahrer
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*Formerly subyluvr2212*

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My XT pings on anything except 93 octane. I checked the disty and it's actually retarded all the way, I'm slightly wondering if it's advanced a tooth and then retarded as far back as that extra tooth will go.

One day I'll get someone to put a timing light on it and see what's up.

If it's not that, I'll attribute it to Subaru's famous reputation of building up carbon deposits.
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Old 07-12-2004, 06:33 AM   #6
sixpack subaru
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Quote:
Originally posted by subyluvr2212
My XT pings on anything except 93 octane. I checked the disty and it's actually retarded all the way, I'm slightly wondering if it's advanced a tooth and then retarded as far back as that extra tooth will go.

One day I'll get someone to put a timing light on it and see what's up.

If it's not that, I'll attribute it to Subaru's famous reputation of building up carbon deposits.
If by XT you mean an EA82T Engine, there are a few things to look out for. For Starters, the Dizzy is driven off the LH Camshaft and as Belt Stretch occurs, timing of Ign goes out.
Before Adjusting Ignition Timing, adjust Cambelts FIRST!!!
Then Connect Green Single Pole Connector Under DS Dashboard/CrashPanel and set timing to 8 Deg BTDC for Carby, N/A Engines and 20BTDC for Inj Turbo Engines.
Also, ask your Subaru Dealer for some UPPER ENGINE CLEANER.
A very good carbon deposit remover. But, from all that you are saying, I would Re-seal the Oil Pump, and if noises persist, I would go on to the Cam Housing 'O' Rings, (Oil Delivery for Lifters from Cyl Head). I have only ever had to replace lifters after over 30,000 miles of abuse. (and yes, what you are doing to your engine is abuse!! )
Anyway, any questions, ask away.......
Cheeers!!!!
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Old 07-12-2004, 08:53 AM   #7
camshaftprelube
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I assume that if it had an actual knock (rod/main bearings) you would have blown it up already. You are probably experiencing detonation, or lifter chatter. Cures have already been posted.
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