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#1
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Sluggish & bucking when cold...
My '94 Bordeaux 2wd starts right up in the morning but it's sluggish and kind of bucks or jerks a little until it warms up. I've tried the following in the past few months to get it to run better:
-Store-brand fuel injector cleaner -Chevron/Techron fuel injector cleaner -replaced the PCV valve -checked and replaced all the little vacuum lines under the intake manifold -checked the big vacuum lines and the intake snorkel- repaired a small crack in that. -new spark plugs and checked all the coil boots -checked the fuel injectors with a stethoscope and they all seem to be clicking properly -Always use 91 octane (highest we get in Utah) -No check engine lights/codes Any suggestions on what to try next? Could this be a transmission issue? The engine seems to rev freely and smoothly in neutral but bogs down in gear. I replaced the trans fluid and filter recently as well. |
#2
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Re: Sluggish & bucking when cold...
check the TPS (ThrottlePositionSensor) should read .5v with the throttle closed iirc.
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1992 SVX Pearlie: AmsOil signature synthetic 10w40 and Ea15k20 filter, Cobb crank pulley, Outlaw Engineering spacers and tb bypass, LGT 5spd, Slotted Crossdrilled rotors and ceramic pads, 11:1 compression, EGR delete, Port & Polished heads, SaikoMichi catch can, A/c delete. |
#3
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Re: Sluggish & bucking when cold...
Tried replacing the coolant temp sensor?
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#4
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Re: Sluggish & bucking when cold...
Doh! this first, temp sensor caused major problems on a friends car.
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1992 SVX Pearlie: AmsOil signature synthetic 10w40 and Ea15k20 filter, Cobb crank pulley, Outlaw Engineering spacers and tb bypass, LGT 5spd, Slotted Crossdrilled rotors and ceramic pads, 11:1 compression, EGR delete, Port & Polished heads, SaikoMichi catch can, A/c delete. |
#5
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Re: Sluggish & bucking when cold...
Not the coolant temp sensor- replaced that today when the car was dead cold. The one I took out didn't look very old either.
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