Im having a problem on my cl-s sometimes,as im excelerating some times the car kinda bucks for like a two or three seconds i dought its cuz of the newer mods.Im thinking the fuel pump is to blame but not sure,plz chime in with any info to help me out with this if any of u had this happen to you.

 

spark plugs or coil pack

 

I just put new plugs on the car but never changed coil packs how would i know what coil it may be or do i just have to change them all?

 

Do you have a cel? Check for a soft coil pack ( flexible) they should be stiff if that doesn't wrk then you must using aftermarket oil filter or something

 

Auto or 6MT?

Sounds like a fueling issue to me though.

 

How does your car idle? When my idle was acting up, the car would lunge as if i was tapping the gas / jerking

 

No check the engine light.I will check all the coil packs and see if any are soft.I do use aftermarket oiling full synthetic oil 5-W30 with K&N oil filters always.

 

Its a automatic and the issue seems like a fuel problem. I dont see any other signs of it being that, it only does it sometimes not all the time wierd.I only use sunocco ultra 93 fuel btw

 

No it hasent done that? It was shutting off for a while after i installed the new exhaust but that stopped, probably the cpu adjusting.

 

Explain "bucks".....'cause I know it's not throwing out its back wheels into the air. Do you mean lunges or chokes back?

 

i have done headers, CAI, tb spacer, thermal gaskets, p2r plenums, catch cans, ud pulley, high flow cat, and ct mufflers..

and never had one issue with the car .

and all the mods were done at different times,, with at least a week or 2 minimum apart from one another.

i would not point at the mods.

im guessing wonky coil pack. but then again it could be fuel related IE a relay on it's ends or something of that nature..

i have a relay going for my DRL they work sometimes then don't work the odd time.. i hate intermittent shit

 

My car started to buck right before the fuel pressure regulator and pump took a shit.

 

regulator is just a diaphram tho isn't it?? i thought they work or don't work kinda thing?? hmmm..

shoulda put in shell v power alll the time,. then u have no fuel problems lol... jk

but I do wonder IF me being a brand loyal custy has made my car last any longer. mind you where i liv there are basically no mom and pop stations anywhere to be found

 

The diaphragm is rubber and could tear. Its possible (though unlikely) that it can get blocked.

Its also worth noting that my regulator was aftermarket, but the pump at the time was OEM. It had 104k miles on it when it died. I had the same symptoms OP is describing though, and there was no CEL.

 

Im horrible at descritions but ill give it a try. Ill hit the gas then it will try to go but lose motion then pull and cut back a again really fast for about 4 reps of that pattern then go. Example u ever floored the car in neutral or park and hit the rev limitier? Well it does that same patter but in motion instead.Hope this gives a clear idea

 

Check engine light? Im starting to wonder if it has anything to do with the TPS.

 

Mine does the same thing, but rarely. I will be going about 45 mph and suddenly it feels like the engine slows down and it bucks for 2 seconds and then is back to normal. It is usually a few minutes after I've started driving.

has something to do with the gears getting proper lubrication?
clogged injector maybe? I tried seafoam I haven't had a problem since that I can remember.

The car is running a little rich, but I have just bolt-ons so I don't think it's that.

 

I hope its not the gears not gettting proper oiling ,that would be bad! yes this happens once in a blue while im driving and decide to speed up,never happens from a stand still at least i cant recall that. Also no check the engine light.

 

Have you tried cleaning your iacv?

 

But the car doesnt do it when im at idle? happens while driving and trying to while excelerating.

 

Mine did it during acceleration and deceleration as well.

 

Any more info on this? my engine has been doing this lately as well. AND for some reason WHEN IT RAINS... My car misfires... WTF???

 

I had a similar issue where the car seemed like it was bogging down while in motion. I came to find that I had a dirty/loose coolant temperature sensor. So I cleaned it with some MAF cleaner and cleaned the MAF sensor at the same time since I have a CAI.

 

Mine started it right after I posted checked everything couldn't anything but eventually located it to O2 sensor bank1 the first one but I also changed the fuel filter

 

I'm having the same issue but I think it has something to do with the tranny

 

With this car, that is always a possibility. My CEL came on with some wierd shifting and I took it back to AAMCO and since I was stupid enough to buy a lifetime warranty on the tranny, they ordered a new gear set and it didn't cost me an extra dime.

 

That's the way to go if you prefer to rebuild it. Costs like a grand for the warranty but it's worth it for this car.