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Boxstard · 10-04-2018, 05:16 PM

Maybe coincidence but after replacing my worn engine mount and the crank pulley with underdrive one, now I am hearing what seems to be chain noise when giving very little throttle at low rpm, say steady-state driving below 50mph in 4th gear.

As soon as throttle is closed or open to decelerate or accelerate, noise immediately stops but it comes right back with slight throttle opening to keep steady speed.

I thought of tensioners but no chain noise at cold start at all, so they are OK I guess?

And ideas of the root cause, or is it one of those M96 engine habit? I have no fear with IMSB, but this is bugging me even though the engine runs smooth except the noise under this isolated condition.

10-04-2018, 05:16 PM	#1
Boxstard Registered User Join Date: Apr 2016 Location: SE Michigan Posts: 496	Chain noise? Maybe coincidence but after replacing my worn engine mount and the crank pulley with underdrive one, now I am hearing what seems to be chain noise when giving very little throttle at low rpm, say steady-state driving below 50mph in 4th gear. As soon as throttle is closed or open to decelerate or accelerate, noise immediately stops but it comes right back with slight throttle opening to keep steady speed. I thought of tensioners but no chain noise at cold start at all, so they are OK I guess? And ideas of the root cause, or is it one of those M96 engine habit? I have no fear with IMSB, but this is bugging me even though the engine runs smooth except the noise under this isolated condition. __________________ 1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow! Last edited by Boxstard; 10-06-2018 at 12:28 PM.