89FirebirdUK

Hi All

From standstill, if I put my foot down sometimes the car judders while pulling away.

Why does my car do this ?

Thanks
Geoff

Enkil

wow that was vague..

What kind of car do you drive? What kind of engine does it have? TBI, TPI, carb, manual, auto, any mods, yatta yatta.. Also, if you could give more details about the symptoms...

It would go a long way for us to help you diagnose the problem.

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

89FirebirdUK

Apologies if that was too vague

I have a 89 Firebird with a 305 TBI. The CAT has been removed and has larger pipes from the where the CAT back to the muffler, with 2 3" tailpipes.

I'm not sure what extra details you guys want; from standstill, if I put my foot down the car judders while pulling away. That's what I've observed.

Cheers,
Geoff

Vader

89,

Sounds as if you have a possible ignition misfire under higher cylinder pressures - a common malady with weak spark. Check teh condition of the distributor car, rotor, ignition wires, and spark plugs. Gap is important, since too wide a gap will be more prone to spark blowout.

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Later,
Vader
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"Make Me Bad..."
Adobe Acrobat Reader 4.0
KaleCo Auto Parts

vortecfcar

does it judder or shudder......hehehe , I cant help myself!

Red Devil

I'm with Vader, I think it is ignition related. Does it also do it under load? Also is it every time from a stand still, or only when you bury the throttle?

Apeiron

Sounds more like wheel-hop to me.

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1984 Camaro Z28 Astral Silver w/ 2 1/2" cowl induction hood
Engine: Decked 385 cid 4 bolt w/ oil cooler, 9.6:1 compression, ARP fasteners, 600 cfm Performer carburetor, Torker II intake, Performer RPM Heads, XE268H cam, Magnum roller tip rockers, MSD6AL ignition, Blaster2 coil, recurved HEI distributor
Exhaust: Terminator headers, Custom 3" TIG welded stainless exhaust, Twister muffler
Transmission: 4L60 w/ Corvette servo, .500 boost valve, TransGo 7-CS clutch springs, 700 PKH pump rings, 700-2 reprogramming kit, Borg-Warner High-Energy frictions & bands, 2400 RPM lockup torque converter
Drivetrain: 2.73:1 limited-slip Dana 44 w/ disc brakes
Tires: Front P225/50VR15 Rear P265/50VR15 Eagles

Because you can always sleep in your car, but you can't drive your house.

89FirebirdUK

Red Devil,

It does it when I bury the throttle. If I completely floor it then I just end up spinning the tires.

Geoff

vortecfcar

that last post made my brain hurt! Burying the throttle = completely flooring it. What we're trying to figure out is if your rear tires are hopping or if the car is missing. does it have power to spin the tires off the line or is it down on power? when you break-torque the car does it spin the tires with ease or does it just make a bunch of ugly noises and buck?

[This message has been edited by vortecfcar (edited January 30, 2001).]

89FirebirdUK

Ok, In the past, if I completely floored it, then the tyres spun. If I put my foot down rapidly, but not all the way then I get the juddering or as you put it make a bunch of ugly noises and buck?

I think my car needs the spark plugs changed as well.

Does this help ?

vortecfcar

do a cap,rotor,plugs, and wires and see if that helps. If the problem persists then repost it.