Intermittent jerking/bucking while driving?

[kitcho]

I've been having intermittent problems with my car bucking back and forth while driving at normal driving speed (40-60kph). It has happened to me twice in the last two week and is very noticeable. After fairly short, erratic bursts of power loss and car bucking it subsides and my car drives normally.

Searching here, people here mentioned the possibility that it's the transfer case. I had my mechanic who is familiar with dsm's checked it just a couple weeks ago and found no issue (no fluid leak from the yoke). Should I double check the fluid level?

On another site people mention that it could be a coil pack, spark plug, spark plug wire, or injector problem. How do I go about narrowing it down? All I have is a logger and keydiver chip that shows me knock.

thanks

 

[SmoothCustomer]

I agree about the ignition stuff. You narrow it down by replacing all of it because it's cheap and could probably use it anyway. Also I would bet your problems are actually just a boost leak.

 

[Specter]

Could be your fuel pump too /ubbthreads/images/graemlins/dunno.gif Mine used to do the same, turned out to be a dieing fuel pump. Start with the usual things, check the fuel pump flow, check your spark plugs, check for boost leaks, check for any torn vacuum pipes etc

 

[kitcho]

Weird.

I did a quick log this morning, only to find that my front o2 sensor is showing 0.00v all the time for some reason. I guess I'll start with that.

Thanks for the replies as well

 

[broxma]

Also, BOV. In particular if you replaced it with an aftermarket one with an adjustable spring.

Start with the easiest to check and move from there.

/brox

 

Sounds like a miss IMO. Check ignition components and definitely do a boost leak test first off. Very well could be a leak for sure. Boost leak test is your cheapest, check that first. Then look at your plugs.