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Qg18 rattle/knock

Sunny to Skyline - SR20, CA18, RB20-26, VG30 etc.

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heroyuy
Street 2NR
Posts: 59
Joined: August 22nd, 2016, 3:44 pm

Qg18 rattle/knock

Postby heroyuy » May 3rd, 2019, 6:27 am

Anyone experience severe rattling when accelerating qg18de (nothing when off the throttle). Car also hard starts when cold,nedd about a minute of tumbling.. Throttle body has been cleaned and replaced. No CEL or error codes. Sparkplugs good (ix). Car was scanned and nothing showed up. Any suggestions?

The electrician showed me that 3 coilpacks were leaking current.could that be the cause of rattling?

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TurboSingh12
Riding on 16's
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Re: Qg18 rattle/knock

Postby TurboSingh12 » May 7th, 2019, 9:12 am

Ignition rattle try using Premium Gas

heroyuy
Street 2NR
Posts: 59
Joined: August 22nd, 2016, 3:44 pm

Re: Qg18 rattle/knock

Postby heroyuy » May 7th, 2019, 12:12 pm

TurboSingh12 wrote:Ignition rattle try using Premium Gas
Ran 2 tanks of premium wirh red line fuel treatment. Pressure still. Car is hard to start when cold now.

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sMASH
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Re: Qg18 rattle/knock

Postby sMASH » May 7th, 2019, 1:09 pm

TurboSingh12 wrote:Ignition rattle try using Premium Gas
What Bout resetting the ecu? Like to let it retune itself...
Or not necessary?

heroyuy
Street 2NR
Posts: 59
Joined: August 22nd, 2016, 3:44 pm

Re: Qg18 rattle/knock

Postby heroyuy » May 7th, 2019, 10:35 pm

sMASH wrote:
TurboSingh12 wrote:Ignition rattle try using Premium Gas
What Bout resetting the ecu? Like to let it retune itself...
Or not necessary?
I trying everything yes. One scan tool showed live data feed that thr maf is giving a slightly higher than average reading. Will change that and throw in some fresh plugs for the sake of it. How do i reset ecu?

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sMASH
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Re: Qg18 rattle/knock

Postby sMASH » May 8th, 2019, 8:05 am

Coukd it be like the tensioner pulley?

Cause it's a lot of y12 and tiida that I hear that rattling noise when accelerating.

I want to doubt that it's the timing with so many vehicles... Although, a low octane woukd throw off the settings.

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TurboSingh12
Riding on 16's
Posts: 1247
Joined: November 24th, 2014, 9:24 am
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Re: Qg18 rattle/knock

Postby TurboSingh12 » May 8th, 2019, 9:12 am

Run a compression test and see how healthy your motor is.

Agent_orr
Riding on 13's
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Joined: September 15th, 2018, 8:59 pm

Re: Qg18 rattle/knock

Postby Agent_orr » May 15th, 2019, 9:53 pm

Had same problem with qg15de was the chain tensioner, galleys were blocked causing it to jump a tooth or two would still start and run strait away with a lil ticky knock then under acceleration would become a knock,rattle, with the value of engine, would say replace with hole new engine very cheap and easy engine to replace

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