The machine that goes "ping"

mroberts · Post by **mroberts** » Mon Jul 02, 2007 11:43 am

EA82 - stock

Coasting downhill (engine braking) makes it "ping". Is this normal ?

Otherwise seems to run fine.

What can I do to fix it, if I need to ?

Post by **Alex** » Mon Jul 02, 2007 3:01 pm

it isnt backfiring is it? my old motor(ea82) use to backfire like a bitch when i was using engine bracking down the hill..

alex

mroberts · Post by **mroberts** » Mon Jul 02, 2007 3:15 pm

It's more of a metal on metal tapping sound than a "bang"

steptoe · Post by **steptoe** » Tue Jul 03, 2007 9:17 pm

find a quiet downhill spot (just a genrtle slope) to roll down - forward preferably, with engine off and listen. Does it still 'ping' ?

No = stumped.

YES ! = tailshaft uni ? grease it , maybe replace it

steptoe · Post by **steptoe** » Tue Jul 03, 2007 9:18 pm

in neutral foot off clutch

mroberts · Post by **mroberts** » Tue Jul 03, 2007 10:42 pm

Only happens with car in gear, clutch out, no throttle. If I give it a bit of throttle (not even enough to make a difference to speed), it goes away - it's pretty much only on serious engine braking.

Matatak · Post by **Matatak** » Tue Jul 03, 2007 10:48 pm

is it some kind of constant pinging like when on serious braking it happens frequently or kinda only once through each gear

90brumby · Post by **90brumby** » Tue Jul 03, 2007 10:59 pm

yer i now wat u mean it could b the zorst popin when the throttle is closed 2nd gear is the best to make it happen

if so there is probably a hole in the xorst system somewhere

AndrewT · Post by **AndrewT** » Wed Jul 04, 2007 2:16 am

The engine braking causes the engine to lurch forward a little. I would say you have something loosing hitting on your gearbox, or exhaust or engine somewhere, or something which is possibly mounted too close. Could also be the exhaust is too close to the tailshaft and is touching sometimes. Look at the tailshaft for any shiny metal parts indicating rubbing.

mroberts · Post by **mroberts** » Wed Jul 04, 2007 8:00 am

It's a constant pinging. I'll have a look at the tailshaft over the weekend.

AndrewT · Post by **AndrewT** » Wed Jul 04, 2007 2:56 pm

Also inspect the uni joints in the tail shaft. I had one that was worn so badly it was partially comming apart and rattling under slight load. Pushing the car harder put enough load on to stop the rattling.

YouTube · Post by **El_Freddo** » Wed Jul 04, 2007 3:01 pm

Or a hydrolic lifter, the oil pressure for some reason drops a little and allows some lifter tick at that speed. My old engine used to do this occasionally.

Any noise at idle, or similar noises on a cold start up?

mroberts · Post by **mroberts** » Wed Jul 04, 2007 3:04 pm

The lifter tick is a different noise

Tailshaft would seem to be unlikely since this is happening in FWD mode, so there's no load on the tailshaft either way.

AndrewT · Post by **AndrewT** » Wed Jul 04, 2007 9:46 pm

Yeah but it's still constantly moving...
Any chance you could post up a recording of the sound?

SuBaRiNo · Post by **SuBaRiNo** » Wed Jul 04, 2007 11:07 pm

I had a simlar problem... replaced all the CVs all the wheel bearings and Uni joints... but didn't fix it. Was a metal grinding noise.

Turned out the engine stay rod wasn't right and the motor was leaning forward making the alternator rub on the engine fan. Fan was a good 10mm away from it when i wasn't putting strain on it.

Dave

steptoe · Post by **steptoe** » Wed Jul 11, 2007 10:34 pm

no news Mike - fix it ?

mroberts · Post by **mroberts** » Thu Jul 12, 2007 7:57 am

Sorry, haven't even had a chance to look at it. Hopefulyl this weekend - trying to get ready for a hillclimb.

daveosubi · Post by **daveosubi** » Thu Jul 12, 2007 6:53 pm

Ive got a tinny sound at high revs that comes and goes, I was worried it was pinging but when the clutch was replaced I noticed the top of the cat (heat shield?) is flaking ,rusted and loose, Not sure if it's the same as your problem but doesnt hurt to check.

I havent noticed the sound with engine breaking only at high revs under load, Mine makes the usual old exhaust farts and pops under engine breaking.