Light bucking at stop

[BodylessSHO]

Recently I have noticed a slight bucking, as I call it, when I'm idling at stoplights. It's not terribly harsh, but it feels like the car is jumping a little. What could this be?

No, I'm not welded yet. This month, I'm making an appointment and going. I promise.

 

[Mr. SHO]

Do the rpms bobble at all on the tach?

 

[BodylessSHO]

If any too little for me to see.

 

[BodylessSHO]

I'm going to change the fuel filter to see if that helps.

 

[r0nd3L]

I noticed that I have pretty same thing but I can see RPM bobble a little. This happens at idling when it's warmed up (idles around 0.6).

 

[avocadoman1]

probably coils (let's hope).
however, the TC in the tranny could be intermittently locking up. sign of a tranny fix (let's hope not).

 

[BodylessSHO]

If it were coils, wouldn't it throw a code?

 

[avocadoman1]

i had a miss from a bad rear coil that never threw a code.
the only way i could fix it was to replace all 4 coils in the rear.

regarding you...now i'm starting to think it's not a coil & you've got TC problems.
you say "it bucks". that's not a coil.
a coil is a "miss" that's usually noticed at low rpm's (under 1K).
bucking is the TC locking in and out.
usually the only fix is to get inside the tranny.

 

[BodylessSHO]

I don't know if it's related, but my air just stopped working.

It's not harsh enough to be a TC lockup, I don't think. I might do a Tranny flush/Filter change, and see if that helps anything.

I guess it could be a miss. I don't really know what a miss should feel like.

 

[Mr Anonymous]

Yep, probably a weak coil. Won't throw a code till it's really, really dead. In the mean time, it'll just arc the spark energy out the little cracks in the case of the coil. It can take a long time for the coil to actually die and flip a code. Best bet is to ID the coil and replace it.

 

[BodylessSHO]

Okay, so I can wait maybe 2 weeks to fix that? I'm a little strapped for cash at the moment.

 

[BodylessSHO]

I just put a new tank of gas in it, and it seems to have stopped.

 

[avocadoman1]

what about fuel filter or fuel pump?
just trying to stay away from tranny troubles...

 

[BodylessSHO]

Yeah, I'm going to do a fuel filter next weekend, it needs it anyway. Any specific brands?

I need to get my AC fixed. it's like 105 outside.