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Valves, Rods Or Something Else

Started by mrtl321, Dec 11 2011 04:39 PM

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#1 mrtl321

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Posted 11 December 2011 - 04:39 PM

Last night was driving fine and then the turbo went psycho on me a overboosted like crazy. I shortly thereafter pulled over and heard a ticking/tapping sound which was decently loud. Let the car sit for about an hour and then restarted sound was there. Got it home and the noise wasnt as bad. When the engine revs tapping increases and when the throttle was released no tapping. I'll try to get a video up here sometime soon.

Just wondered if anyone had any ideas or would have a chance to look at it. (lunch/dinner will be purchased) Located in Minneapolis mn.

Thanks!

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Edited by mrtl321, 11 December 2011 - 05:06 PM.

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#2 Rsterns

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Posted 11 December 2011 - 09:12 PM

Well, when I bent my rods, the noise was louder at first as the counter balance kissed the bottom of the piston. After some metal trimmed itself, it got a bit quieter. I just can't say that you also bent a rod.
'98 V70 T5 (Auto) At 280,000 fresh rebuild with port and polish ;Cryo treated everything, IPD Stage III w/ IPD Intercooler and TME cat back exhaust,Koni FSD/ Eibach springs, IPD sways F/R, IPD HDEndlinks, IPD BBK; Slide Show of build: http://rides.webshot...563883893OGxoym '96 965 A sweat find with 30K miles on it! http://rides.webshot...myd?vhost=rides

#3 s_moneh

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Posted 12 December 2011 - 01:17 AM

Overboosting on the bottom end should throw the rod... Wat r u considering over boosting?
1997 854 T5M - Megasquirt 2Extra with COP, Sconemans Intake Kit, Sconemans short shift kit, K&N Panel Filter, poly engine mounts/poly control arm bushings, delrin solid subframe bushings,prosport; boost, oil pres gauges, AEM wideband, OBX Turboback, 16T, D2 Racing coilovers, HKS SSQV4 BOV with BP, FMIC w/ 2.5" piping, 213 Fuse Mod, R manifold, NA 3" throttle body w/ 960 plate, NA cams, lgspeed rods, wiseco 81.5mm pistons, newer style oil cooler, green giants, 4bar fuel regulator,28mm rear ipd sway, 25mm front ipd sway, 17x7.5 BBS Propus C's, tons more mods

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#4 Zappo

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Posted 12 December 2011 - 01:24 AM

Yes, what do you think the boost level was?

When you drove it, could you hear it in the car while you were driving, or is it only when the hood is up?
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#5 mrtl321

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Posted 12 December 2011 - 02:07 AM

We could hear it a little bit in the cabin not a whole lot though, but when you got outside you could hear it pretty good. I would consider overboosting to be way off the stock boost guage (what is the end of it equate to anyways?). The boost guage i want to say went as far as it could and then bounce a couple times but in general it went all the way and then came back to the end of the yellow circle and for some reason it bounced again way down even after i took my foot off the pedal. But as soon as i saw where it was i took my foot off the gas right away. It was weird since I wasn't doing anything crazy/racing with the car.

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#6 boxpin

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Posted 12 December 2011 - 02:27 AM

Sounds like there is something wrong with your wastegate...as in stuck or a vacuum line leak.

For the engine, can you post a video and it might be time for one of these...

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Edited by boxpin, 12 December 2011 - 02:30 AM.

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#7 Zappo

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Posted 12 December 2011 - 04:22 AM

The end of the white is roughly 15 psi. If you went as far as where you have indicated, you are in rod bending territory.
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#8 s_moneh

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Posted 12 December 2011 - 05:04 AM

even a split second on stock bottom end would destroy the rod, thats sucky sucky business
1997 854 T5M - Megasquirt 2Extra with COP, Sconemans Intake Kit, Sconemans short shift kit, K&N Panel Filter, poly engine mounts/poly control arm bushings, delrin solid subframe bushings,prosport; boost, oil pres gauges, AEM wideband, OBX Turboback, 16T, D2 Racing coilovers, HKS SSQV4 BOV with BP, FMIC w/ 2.5" piping, 213 Fuse Mod, R manifold, NA 3" throttle body w/ 960 plate, NA cams, lgspeed rods, wiseco 81.5mm pistons, newer style oil cooler, green giants, 4bar fuel regulator,28mm rear ipd sway, 25mm front ipd sway, 17x7.5 BBS Propus C's, tons more mods

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#9 mrtl321

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Posted 13 December 2011 - 02:02 AM

Took it to the shop today and stethascoped it and all the goodies. Found that the noise was coming from the top of the engine. Just went out to get a video, and of all the times it wasnt doing it loud enough for the camera to pick it up.

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#10 Korruption

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Posted 13 December 2011 - 03:53 AM

View PostZappo, on 12 December 2011 - 04:22 AM, said:

The end of the white is roughly 15 psi. If you went as far as where you have indicated, you are in rod bending territory.

Hit over 18-20 after my manual swap... same thing happened as to OP. Most likely a bent rod... ended up buying another motor.

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#11 renns

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Posted 13 December 2011 - 08:07 PM

If you've got a youtube clip of the car running at idle, play it together with an on-line metronome to determine frequency. If it's 1/2 crank speed, it's top-end related. If it's at crank speed, is the bottom end. More details on this method of diagnosis here:
http://www.___.com/f...=214372#p214387
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