Jerking during initial acceleration

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Old 26 Apr 2005, 10:46 pm   #1 (permalink)
Kimberly via CarKB.com
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Default Jerking during initial acceleration

My 1993 XLE V6 has began to jerk during acceleration. This only happens
when I have to come to a complete stop. If I press the gas pedal gradually,
it does fine, but if I press it as I usually have been doing, it jerks. I
have run out the gas and used a gas treatment with new gas but nothing has
changed. Any ideas?
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Old 27 Apr 2005, 06:18 am   #2 (permalink)
m Ransley
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Default Re: Jerking during initial acceleration

No way to know without being in it, if it is fuel or electrical.
Missfiring can do it, plug wires, coil, cap, plugs. Or fuel related ,
pump, filter. eyc

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Old 27 Apr 2005, 12:27 pm   #3 (permalink)
Daniel
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Default Re: Jerking during initial acceleration

You need to clean the throttle body.
There's a butterfly valve that will stick after time.
Haynes manual shows a picture how to clean it with emissions control
safe carburetor cleaner, a toothbrush and a rag.
You only need to remove the clamp on the air tube to access.
Fairly simple.
Or . . . you could have a dealer remove, clean and adjust the TB at
higher cost..

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Old 01 May 2005, 12:38 am   #4 (permalink)
davemac
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Default Re: Jerking during initial acceleration


Kimberly via CarKB.com wrote:
> My 1993 XLE V6 has began to jerk during acceleration. This only

happens
> when I have to come to a complete stop. If I press the gas pedal

gradually,
> it does fine, but if I press it as I usually have been doing, it

jerks. I
> have run out the gas and used a gas treatment with new gas but

nothing has
> changed. Any ideas?


Can you provide a little more info? Does it happen only from a cold
start? All the time?

I had a very similar problem recently on my wife's 93 XLE V6 camry. It
turned out to be (mostly) a bad air filter to throttle body air hose
that had cracks in it. You can check that on yours by pressing down on
the intake hose with your fingers around the creases aggressively to
see if you can find any cracks. As well, squeeze the hose to distort
it and see if a crack reveals itself. If it does, get yourself some
heavey plumbing tape 2" wide, and repair it with that temporarily until
you get a new one ($50+ cost for a new one). Her mileage was ~ 150K
mi. What happens at least in this case is that the computer is thrown
off on the air/fuel mixture at low throttle pressure since the Mass air
flow sensor is at the other end of the hose with the air filter. It is
very apparent for a cold start since the engine needs a richer fuel
mixture and does not get it. Of course, it could also be several other
things such as a bad air flow sensor, fuel pressure problems, ECTS,
plugs, etc. Another symptom of this that occured on my wife's car at
least was that the car had a rough 1st to 2nd shift. After I repaired
the hose, that shift roughness was dramatically reduced also.

Cheers,

davemac

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