Hi i have a 99 civic si b16a2. I Recently got a lag going. When i take off, it startes with the lag. the rpm starts going crazy and starts just going in and out of power(Laggy). idk if its because of the fuel line or gas is dirty. i took it for a ride while it was cold. and nothing. once it started warming up its started with the lag. rpm is fine when its warm and sitting but when u rev it it starts with the lag again. PLEASE HELP!!!!

I tried a Water Removal Gas Treatment. but nothing.

 

when was the last tuneup?

 

do u have a check engine light? sounds like your throttle position sensor. you wont always get a check engine light from it either

 

Last tune up? Have you checked the ignition timing? Cel's? Any major work done to the car?

Also, at your next fill up run some good fuel system cleaner threw it.

 

As said any cels? Id check your dizzy

 

op died?

 

when i turn the car on no lights are on and when its starts to lag thats when it turn on. & the car has been parked in a garage for 6 months till now that i got the money for insurance.

 

wats cels?
i have but didnt mess with it.
& no major but its swap & new clutch. but it all started after that.
i was planning on putting a fuel inj cleaner and Plus gas & try that.

 

Check engine lights

 

mine does the same thing. my problem is a sticky idle air control valve. runs fine and when it starts to run like **** the cel comes on. try this when it starts to act up shut the engine off and then restart it, this stops my issues for awhile. there are some write ups on here on how to clean the iacv (idle air control valve) I've just been busy and haven't got around to doing mine

 

i will try cleaning the iacv and keep u guys updated
THANKSZ

 

So any cels?

 

when it starts to lag and starts to jerk it turns on.

sunday im going to check for the code and ill give u it.

i would have turn the car off so it can turn off.

 

so i think i found the prblm. i put the wrong gas -______- i never knew em1 are only premuim

 

Look in your owners manual. B series Vtec are designed to run 91 octane. Something with a lesser octane will cause pre ignition.

Remember the octane of gas does not mean it's a better quality gas but that it is more resistant to combustion.

 

 

i did read it. 93 premium. I was dumb at first and put regular and that when it started the lag.