engine having rough idle and exhaust backfires a lot

[ghostuss]

my engine is having rough idles and it would shake violently. and exhaust is backingfiring (poping) on shifts or deceleration while gear. Anyone have any ideas what's up?

[wootwoot]

Change your plugs and run some Redline fuel system cleaner

[SimpleSexy180]

do you have the correct timing???

[ghostuss]

i dunno. just got the car i dunno wtf previous owner did but it drives fine. Just small idle problem, backfire etc. So right now I am gonna clean up the fuel system with some system cleaner. Actually still have a bottle chevon cleaner that I didn't use from last time. Then gonna change the plugs clean the throttle body. And check timing. If not then I was told might be a vacum leak

[ranisron]

it doesn't sound like a bad injector problem... I was running on 3 cylinders for a while... that was horrible.

cap, rotor, plug wires should be upgraded/updated as well while you are doing some maintenance jobs...

[ghostuss]

new caps and rotors already. so you saying it has 3 cylinders? Maybe I will get a compression and leak down test done to it.

[ghostuss]

gonna try to reset the ECU and see what's up. Weird how this car passed smog.

[zfinger]

My car did the same thing, then wouldnt start... So i ripped it out and im going KA-T...It was a good enough reason for me, how bout' you?

[nomis331]

my car had the same symptoms and it turned out to be leaky injectors and injector seals. you might want to check to see if those are leaking.

[ranisron]

I doubt the problem you are describing is related to failed injector (running on 3 cylinders). When mine was running on 3 cylinder, it was BAD... I mean below 3500 rpm the car ran like crap pooh.

[Rennen]

At idle, pull off a single spark plug wire at a time, if your idle gets worse, that that wire is good, if it doesn't change, then you have a bad wire. I have had 3 OEM wires go bad on my 2 KA24Es, and this is a simple 10 second test.


-Matt

[GLoBaLReBeL420]

hey, what do you guys mean by the cap? Are you talking about the distributor cap? or what?

[massscene]

Thats what I did. My number 3 isnt firing or the injector isnt working. Compression test came back fine.

[xtreme_s14]

are you having this problem on a s14? 'coz i'm experiencing this same problem too and so is a buddy of mine.. but my exhaust doesn't backfire, it sputters.. but then again, i do have 3 inch piping.. but anyways.. try cleaning out your TPS! i've yet to try it, but i'll let you know how it goes when i clean mine.. or if you get a chance to before i do, let me know how it works out on yours! could be timing too.. if you have a larger exhaust, it does tend to retard your timing.. from what i'm told!

[sblack13]

my single cam was doing that when i bought it. Found leaky vacum lines, check your timing. And reset your ecu, and adjust your idle by the intake manifold. Idles like a beast now

[HardStyleDrift]

I know this sounds strange, but on my car I had the same problems when I had a bad exhaust leak by the downpipe, does the car hesitate a little at WOT?, because mine did, and it also ran a lot better right when it hit a certain point in the RPM range, do u experience any of this?

[240sxconversion]

it sounds like timing or like hardstyledrift says could be a exhaust leak, o2 could be getting wrong reading or something.

[redsuns3838]

i had those problems with bad timing but it could be a slew of stuff. i had a lotta backfiring on shift and downshift with bad timing, and my idle was shit.