Engine Screwed?

[howhow82]

Was having a bit of fun with my fren in princess hwy. When i shifted to 2nd gear and rev around 6500rpm my engine suddenly juz lag on me..... How should i say it.... The feeling was like the same feeling when u release ur clutch too early and u get the choke. But it was on 6500rpm and the car is around 90km/h.

Is this wat they call PING? or my piston ring is f*ked? Anyone got the same experience before? Should i send my car to a mechanic? Can they detect anything without tearing the engine block apart ??

Help will be really appreciated.

Thanks

[howhow82]

And yes i need advise from someone who know wat he is talking about instead of all the guessing.

P.S. I got my engine rebuilt last year this time. Cost me 4k~ Hopefully tragedy will not repeat. :<

[Dingo]

Pinging is also known as knocking basically its an uncontrolled detonation.

When your spark plug fires it has a controlled/smooth burn of the petrol but when its really hot per say then the fuel will ignite before the flame from the spark can get to it, combusting suddenly before the optimum moment aka the Power Stroke.

This uncontrolled detonation creates a shockwave which reverberates in the chamber creating a "Pinging" Sound. The Pinging sound is distinctly a metallic sort of pinging sound.

And thats what Pinging is

If you want to check if your Piston rings are f**ked do a compression test dry & wet obviously. If you get two totally differnt results on a cylinder from the Dry compared to the wet, then your rings could possibly be screwed.

[RB30-POWER]

So it lagged a bit, but whats its doing now?

Blowing smoke, not running at all, missing or running fine?

[kudos.motorsports]

I would recommend firstly removing the spark plugs and having a look at the electrode. The electrode should be brown to greyish white in colour and should show no signs of wear. If all is well there then my best guess without testing the car would be that your coil packs may be showing signs of failure. If the electrode is warn in any way it would suggest possible detonation.

The sound of detonation (Pinging) is very distinctive and my best description would be filling a tin can with marbles then shaking it like crazy. But then add exhaust, road noise and sound deadening and I am sure you get the idea. If this is the case it’s time for a tune and possible fuel system upgrades.

[Guest Mashrock]

boost loss. through shit cooler pipe/hoses etc?

[GTAHH]

Fuel filter. Turbo goneskis?

[jmac]

sounds like boost cut????? or ECU R&R??? you running the factory computer?

[BenA31]

i sounds like rev limiter is set low on aftermarket computer or boost/fuel cut on standard ecu....but yeah how does it run now under normal driving? still the same or having other issues?

[paulr33]

does the car make positive boost when you drive it? if so then turbo is ok, well most likely. if it doesnt go past 0 then exhaust wheel is dead

[Husky33]

It sounds like blown intercooler piping to me. Check all the piping, see if any clamps are loose. if not that check to see if ur afm is working.

[ch0pstA~]

I had same problem last week, as paulr33 ^^^ said, exhaust wheel on turbo could be screwed, mine now looks like a pile of dirt...

[howhow82]

My car is running fine now.

jmac - My car is running with standard ECU.

paulr33 - Boost gauge still showing that it on 0.5 bar when rev. So probably not the turbo problem.

By the way, do u think shifting gear around 6500 RPM is appropriate. I mean it is too early or push the engine too hard oledi. Juz want to be on the safe side.

[dezz]

i wouldnt say shifting at 6500RPM is too early . lol

[paulr33]

it wont make power past 6500rpm tho

[dezz]

it wont make power past 6500rpm tho

<{POST_SNAPBACK}>

hope that wasnt directed at me?

i was saying 6500RPM changes cant exactly be too early...dont think you wanna be changing to much later lol

[TTT]

it just sounds like you had a AFM cut.

same as when you turn the boost up enough that the AFM can't measure the air coming in fast enough and you get a engine cut sort of thing.

where the accelaration stops instantly for a split second and the whole car jerks.

that's what probably happened.

I doubt you broke anything.

[fEkuaR]

Pointless to thrash your engine or hole driveline for that matter that hard. Id expect to root my engine if i did things like that.

Edited November 14, 2005 by fEkuaR