timing chain

[1989240sx]

hey guys i have a 89 240sx all stock the car has 159,000 i was wonder if i should replace my timing chain at all some time while it is in park the rpm will do up and down also when it is at a stop light it wil stumble like it want to die almost but it doesn't if you guys have any ideas other than timing chain let me know about it thanks

[rogoman]

If the motor doesn't have that infamous rattle at startup, there's no need to replace any timing chain components.

As far as the hunting of the idle, check for a sticking EGR valve. If you haven't done a tuneup lately, do one.

[destroyyourmind]

check your maf sensor wipe it off other people on here have talked about it fixing there idling problems. I dont even have a maf on my car and it idles real rough

[480sx]

check your maf sensor wipe it off other people on here have talked about it fixing there idling problems. I dont even have a maf on my car and it idles real rough

First off, you dont want to touch your maf sensor with anything. Those things are super brittle and will break in a quickness. Use MAF sensor cleaner spray and follow the directions on the bottle.

Second, you mean your running your car without a freaken MAF? Those things arnt something that can just be discarded as some kind of unnecessary car part lol.. So you like driving with a 2500 RPM limiter, getting terrible gas millage, ect?

[destroyyourmind]

haha yeh it idles rough but its not to bad I'm getting one when I get some extra money

[Nismo240driver]

clean your egr valve might be sticking as mentioned earlier but your IAC could be goin out if it only happens when your at a stop a.k.a idling... is what i believe i got out of your post.....tuneups help but leave the timing chain alone unless you hear the oooo so famous "marble in can" noise.....and destroyyourmind....get a MAF with whatever money you have dont wait....case closed.

[1989240sx]

where would the iac be at can not find it in the book

[rogoman]

The IACV is located on the passenger's side of the engine, near the back, below the intake manifold.

[dnlx5]

WAIT first check for vacume leaks they happen alot on 18 year old cars. my favorite way to do this is get a can of carb cleaner and (being wary of fire hazards0 spray all the vacume lines if the idle jumps up that means carb cleaner got sucked through a hole in the vacume system when i had a kae my intake gasket broke and that was the problem so spray your intake gaskets as well

[dnlx5]

hey i got a single cam maf for sale shooot me an e mail

[1989240sx]

hey guys does anyone have audio of a car when it timing chain is going out

[jetroy240]

many possibilities, I'll check first for codes, egr port gallery restricted or plugged w/ carbon deposits, secondary ignition (cap,rotor,wires,etc),or it might need additional grounding for maf sensor(common problem if u got injector code or O2 code).