North American Turbocoupe Organization



have a question about the car's Knock Sensor.
POWERED BY PSI Offline
Senior Member
#1
Hey guys, just yesterday i realized that when i really jump on the gas..my turbo kicks in great...and it runs great...but once in a while when my turbo kicks in fully to 18-20 PSI, i notice a slight hesitation. Tonight it did it really bad..and i saw my RPMs drop about 2000. then its fine...like i said...sometimes it does it, sometimes it doesnt do it...it seems to do it ALOT worse when the engine is cold..when i first go out in the morning. I disconnected my Knock Sensor...and it is not doing it as bad as it was...so, what is this thats happening...i have checked the usually stuff, everything checks out great..any ideas?
Thanks
Zach
85 Turbocoupe. 5-speed.
Mods- single 2.5 inch exaust with highflow cat and Apex bullit muffler, Saab 9000 front mount IC,Centerforce II clutch kit, Gillis BV set at 19psi,K&N on VAM, Hurst shorthrow shifter.
BEST ET-(1/8)-9.7 @71.9 mph
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Pete D Offline
Administrator
#2
If your fully boosting a cold engine, I hope your making weekly contributions to a rebuild the engine and turbo fund. If your engine is dropping 2K rpms, something else is wrong. I'm not sure why disconnecting the KS makes it better.

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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm

[This message has been edited by Pete D (edited 01-05-2003).]
Pete Dunham


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POWERED BY PSI Offline
Senior Member
#3
lol, maybe ill take it easy on those cold mornings from now on! [Image: biggrin.gif] oops! lol, i think my fuel pump isnt enough for this thing. I just replaced it with a stock one...but we all know how the stock Fuel pumps are...anyway,any ideas guys?
Thanks
Zach
85 Turbocoupe. 5-speed.
Mods- single 2.5 inch exaust with highflow cat and Apex bullit muffler, Saab 9000 front mount IC,Centerforce II clutch kit, Gillis BV set at 19psi,K&N on VAM, Hurst shorthrow shifter.
BEST ET-(1/8)-9.7 @71.9 mph
Reply

Kev Offline
Posting Freak
#4
yeah, fuel pump...get a bigger one, make sure IAC is clean and TPS is within range. Tune up, blah, blah, blah, you know the drill.
Kev
1988 TC 5spd
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Jeff K Offline
Administrator
#5
Quote:Originally posted by POWERED BY PSI:
lol, maybe ill take it easy on those cold mornings from now on! [Image: biggrin.gif] oops! lol, i think my fuel pump isnt enough for this thing. I just replaced it with a stock one...but we all know how the stock Fuel pumps are...anyway,any ideas guys?
Thanks
Zach

Dont waste time / money on a fuel pump unless you know it isnt up to the task. Measure fuel pressure under boost to be sure it is base (39 psi stock) + boost press at WOT / high RPM, high boost. If the fuel pressure checks out, the pump is OK.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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POWERED BY PSI Offline
Senior Member
#6
how would i go about checking that? i do have a fuel pressure checker...but is there something i need to do particular? let me know, thanks for all the great help, and keep bustin ass guys!
Zach
85 Turbocoupe. 5-speed.
Mods- single 2.5 inch exaust with highflow cat and Apex bullit muffler, Saab 9000 front mount IC,Centerforce II clutch kit, Gillis BV set at 19psi,K&N on VAM, Hurst shorthrow shifter.
BEST ET-(1/8)-9.7 @71.9 mph
Reply

Jeff K Offline
Administrator
#7
Hopefully, your fuel press gauge has a few feet of hose on it so you can tape the gauge to the windshield to see it while driving. If it doesnt have a long enough hose, see if you can modify it with a few feet of HIGH PRESSURE hose so it will reach.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Pete D Offline
Administrator
#8
Zach, check your e-mail
Pete Dunham


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