After replacing the timing belt on the newly aquired 90TT i purchased. i noticed a loud rattling/tapping noise coming from under the drivers side plenum, just behind the timing belt cover. The noise comes and goes. After searching i suspected the VTC, but when i unplugged the harness (as seen in the video) there was no change. I replaced the VTC springs and o-rings when i did timing belt. Doesnt sound like lifters to me...what do u guys think?


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hmm sounds like a dodge diesel

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'93 300ZXTT (black)
'03 Hummer H2 22`` chrome wheels with 37`` mud tires (daily driver)
Vancouver, BC

carztuff.com
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ZADDICT "Looks great, I am also interested in a "mini mount" ;)

Sounds like abad vtc gear. Unplugging the harness doesn't do it, you need to engage it with program or ground out the connection manually.

yeah that definitely is a bad VTC gear. people have been telling me it resembles a diesel motor when they go out. pick up some BDE rebuilt units and call it a day.

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I have Lived and Learned to LOVE... MY Z

zazupilot: you are luminar - slayer of Z's
1991zed: "i have a dual hks exhaust that gives me a good 30hp"
Ballistic: "A lime green Lambo with black wheels: The car of choice for the efeminate guy with the tramp stamp who wants to be a bada$$. Just say no to pillowbiting."
Ballistic: "Be sure to tell someone at your job that he's an idiot. Then stay away. Idiots self-destruct at any given moment."
YOU + ARE = YOU'RE. THEY + ARE = THEY'RE YOU ILLITERATE BASTARDS

Can anyone explain why the noise or bad vtc gear only presented itself after i replaced the timing belt and vtc springs?

Double check the bolts holding the gear to the camshaft. On my passenger side exhaust cam three of the four bolts backed out and the fourth was very loose. The tb cover was keeping them in place. It sounded similar to what you have. Just something to check.

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Black 1990 N/A 5-Speed, with JWT Pop Charger, ASP U/D Pulley, Fidanza Flywheel, Nyx 1-piece propshaft, Stillen Headers, Labree S/S Hi-flow Cats, Borla S/S Catback, ASH-Spec ECU, putting down 202 hp / 186 ft.lb. torq

it would have presented itself as a result of the new stronger springs. the gear is probably old and warn out and since your old springs had warn with it, it wasnt enough pressure.

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I have Lived and Learned to LOVE... MY Z

zazupilot: you are luminar - slayer of Z's
1991zed: "i have a dual hks exhaust that gives me a good 30hp"
Ballistic: "A lime green Lambo with black wheels: The car of choice for the efeminate guy with the tramp stamp who wants to be a bada$$. Just say no to pillowbiting."
Ballistic: "Be sure to tell someone at your job that he's an idiot. Then stay away. Idiots self-destruct at any given moment."
YOU + ARE = YOU'RE. THEY + ARE = THEY'RE YOU ILLITERATE BASTARDS

Ok thanks guys...so at this point my options are... buy rebuilt set for $475 or just buy the drivers one used from Z1 for $150. Is there a high % the passenger side fail soon as well? Any suggestions?

Kinda sounds like the T-belt might be loose. They rattle pretty loud with too much slop.

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1990 300ZX Twin Turbo
"Mr.DxD"
www.ZspeedPerformance.com