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Author Topic: Might be making progress?  (Read 16127 times)

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Offline earlbrown

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Re: Might be making progress?
« Reply #15 on: December 07 2012, 12:08:07 PM »
The reason I ask is because if your car loses power at 3500 and shifts at 5200 it might just be valvesprings.

If you're shifting at 10,000 and loose valvetrain control at 6000 you have a shift point problem. :D
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline phil_long

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Re: Might be making progress?
« Reply #16 on: December 07 2012, 01:02:42 PM »
Lol.  I understand. 10k? Lol
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Offline phil_long

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Re: Might be making progress?
« Reply #17 on: December 07 2012, 05:13:34 PM »
Just drove home. At WOT from 1st to 2nd the car shifted at 4900.  Car starts to fall flat at about 3400 RPM during that period.  When nailing it, cruising at 45 MPH, the car downshifts firmly but pulls weak, from about 3500 RPM up. Most diagnostics i could get just from the drive home due to traffic.
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Offline earlbrown

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Re: Might be making progress?
« Reply #18 on: December 07 2012, 07:02:41 PM »
Your panties are going to fall off when you get that sorted out! 


If it's falling off at 3400, a very large portion of your powerband is lagging along doing nothing.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline phil_long

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Re: Might be making progress?
« Reply #19 on: December 07 2012, 07:54:32 PM »
just did another WOT, and the car shifted this time at 4457.  This is the most fun experiment.  :icon_eyes:
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Offline phil_long

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Re: Might be making progress?
« Reply #20 on: December 07 2012, 07:56:50 PM »
but it def falls off at 3400, and this time with it shifting earlier(not sure why...maybe because i was in overdrive?), i got hit in the chest with pure power from the next gear.  this car def hauls arse, but there's a lot left in it!!  I can feel it.
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Offline phil_long

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Re: Might be making progress?
« Reply #21 on: December 18 2012, 08:50:10 AM »
can you guys point in the direction of the exact valve spring set i need for my current setup? No cam wiping!! Lol.  Thanks
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Offline earlbrown

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Re: Might be making progress?
« Reply #22 on: December 18 2012, 04:41:45 PM »
I believe the 980's are what everybody runs on stock cams...

http://www.jegs.com/i/Comp+Cams/249/980-12/10002/-1

Full throttle offers them for $43.99 and offers price matching if you want to support a Buick vendor.

I tried to find the PAC equivalent but for some reason they're website won't load for me.


huh huh


"load"


huh huh
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline phil_long

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Re: Might be making progress?
« Reply #23 on: December 18 2012, 08:24:24 PM »
Hahaha.  Thanks Earl.  Im so amped about this.  I've been reading and reading and I KNOW this has to be the issue. 
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Offline earlbrown

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Re: Might be making progress?
« Reply #24 on: December 18 2012, 08:48:24 PM »
If they are original springs they are definitely an issue.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline PacecarTA

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Re: Might be making progress?
« Reply #25 on: December 18 2012, 09:14:38 PM »
Quote from: phil_long on December 18 2012, 08:24:24 PM
Hahaha.  Thanks Earl.  Im so amped about this.  I've been reading and reading and I KNOW this has to be the issue. 

...or:
 weak ignition system ( bad plugs , bad wires , bad coil
 tuning issue (too rich too lean)
 exhaust restricted (plugged catalytic or muffler baffles loose)
 or fuel supply issue
« Last Edit: December 18 2012, 09:18:41 PM by PacecarTA »
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Offline phil_long

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Re: Might be making progress?
« Reply #26 on: December 19 2012, 08:22:13 AM »
all of the above have been addressed.  Might be a little rich in 1st, but def not 2nd and 3rd. Timing chain just got replaced(original) and I've covered everything else myself.  Valve springs have to be it. :atbeer:
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Offline phil_long

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Re: Might be making progress?
« Reply #27 on: December 19 2012, 08:23:44 AM »
well maybe not HAVE TO, but im def hoping so.  Otherwise im still gonna be on the hunt!! :D
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Offline earlbrown

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Re: Might be making progress?
« Reply #28 on: December 19 2012, 11:54:11 AM »
They are at least one of your problems.  If you hop in a time machine and test drive your car at the dealership, the valve springs are weak.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline phil_long

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Re: Might be making progress?
« Reply #29 on: December 19 2012, 02:17:31 PM »
I wish I could Earl.  I would.  Probably stay back there too and live the next 20 something odd years driving a Buick I got fresh from the dealership.  and the problem Im experiencing is what the car would've driven like back then?  it's amazing they were as successful as they were with weaker valve springs.  very mean cars :powersix:
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