1989 240sx Hatch KA24E S13: rough idle, hesitant to accelerate.. etc..

[Acecool]

Alright I am back..

My car is running, but I got a rough idle when it was cold... when it was warm (after highway, it seemed ok, but just just after the highway it was shaking and lurching forward a little...)...

What I have done so far:Cleaned the plugs to all injectors, replaced sparkplugs, checked spark plug wires and distributor cap, cleaned two more plugs at the back of the engine... and messed with the MAF plug..

I had this problem a while back, around the 2500 to 3k it is hesitant to accelerate cleanly and smoothly.. Now it is doing that, and hard to get the vehicle in motion...

Some people said to remove the AIV, does anyone have any PROS and CONS for this job aswell as some pictures explaining what and how to do it (I have searched, only found one thread on this forum and several on another but not really too detailed...)...

The airfilter looks clean, but when I pick it up I see dirt underneath it sitting on the plastic part that goes down..

The little tube that goes into the air thing, if I lift that up you can look down where the front left headlight is, that has dirt in too.. What is the best way to clean these..

What I will try..

Cleaning the MAF plug, Taking the injector plugs out, one by one to double check that they are working correctly.. and I am stuck from there, any ideas?

Thanks again,Josh

[BMAR240SX]

Mines does the same thing i heard its kind of normal all 240s do the same thing with the KA24E engine

[turboboost]

mine does the same b.s..............and i dont know what to do with it!!!! sr swap?? hum??

[Acecool]

Ill try a few things and if I fix it, then I will let everyone know..

Tried searching and yeah, people said it was normal, or injectors clogged..

This or that, or the other...

So I am going to try a few things, maybe take the injectors out clean them and change the airfilter..

Does anyone have a good diagram on how to remove the AIV and pro/cons of doing so?

[turboboost]

does youre check engine ligh turn on and then the car seems normal?..........well mine does that i dont know about yours but what i did to fix the stalling prob is, i disconected the tps....that way the check engine light stays on and the car runs at a high idle but it wont stall or chock on you!

[Acecool]

Nah, do not have a check engine light heh.

bought it in SC where there are no emissions control etc etc..

[Acecool]

Well, I have been riding it rough for the last few days.. And the rough idle is now GONE. I still get some hesitation in the acceleration but not much - maybe bad gas?

Im almost on Empty so, I will try some of that fuel cleaner, maybe a new fuel filter..

What do you all reccomend?

[turboboost]

eheheh check that the spark plugs are on tight...i found two of them that were loose on mine!!! now it backfires like a mofo....but i fuced up a valve in the process.......eheh oh btw it was a recent motor swap and they did a crappy job......i found little things here and there that they missed....

[BMAR240SX]

Well, I have been riding it rough for the last few days.. And the rough idle is now GONE. I still get some hesitation in the acceleration but not much - maybe bad gas?

Im almost on Empty so, I will try some of that fuel cleaner, maybe a new fuel filter..

What do you all reccomend?

I acutully was doing the same thing its like until you really push the car to its limit it will keep hesitating(Its a truck motor what can you expect the ka24de never did this when i had it that was the best) try and do a FULL tune up and put in top nouch gas depending on your buget if that doesnt work idk

[Acecool]

I used to use the top notch gas, and it worked half and half of the time when I used that..

Yeah, the spark plugs are in tight..

Yeah, I noticed mine is backfiring quite a bit.. put put..

[chifarmer]

Try swapping the MAFS. Mine was doing the same thing awhile back. Cleaning it helped (the actual thermistor, not just the connector) but replacing it was the trick. Got a used one on ebay for about $15

[turboboost]

i tried that but still no luck........even the tps

[Acecool]

I am going to run the self diagnostic on it by doing what my book says..

It suggests several things for my symptoms:Poor Driveability: Stuble while accelerating, surge while cruising, and backfire through the exhaust

Here are the things to check, that appear on all pages or at least 2 of them...Ignition wire, Air duct leak, pressure regulator, exhaust gas sensor

Ignition wires are fairly new, air duct I am not sure, pressure regulator where is that? and the exhaust gas sensor I havent tried yet..

[turboboost]

interesting...what book is that?

[Acecool]

It is the 1989 240SX Hatch Service Manual (Retails around $400 or so, got it with the car)

Edition: August 1988Printing: February 1989 (02)Publication No. SM9E-0S13U0

I will try to get a few scans up later today or so.

[turboboost]

UR the man!!!!!!!!!! thanks!!! i have nothing to go by.....just for what what i know....

[Acecool]

Here, tell me what problems you are having and I will scan it in for you..

For 89 240 SX HATCH, possibly for coupe aswell...

Josh

[Logan76]

Check your ground, get an ohm meter, or a multi-meter and put it on the ohm's selection, then put one probe on your negative on your battery, and the other on any unpainted screw on your car, it should be under 2 ohms.

[Acecool]

I just took the hose off between the AIV and the airfilter and capped both ends with some rubber pieces..

I had a slight stutter but now I NOTICE NOTHING WOOOOHOOOO...

Going to try it for a few days and let everyone know, I will also post pics.

[BMAR240SX]

I just took the hose off between the AIV and the airfilter and capped both ends with some rubber pieces..

I had a slight stutter but now I NOTICE NOTHING WOOOOHOOOO...

Going to try it for a few days and let everyone know, I will also post pics.

Hold on first what you did was get a dianostic (for some i reason cant see the picture as always) then what did you do to fix it im in sort of shock to know that this problem can be solved

[Acecool]

Nah, I didnt get a diagnostic,

I just narrowed stuff down with the help of forum members, then blocked the AIV passage and seems to be working fine..

When its cold then it stutters slightly, but once warm DAMN it is great..

Some Mustang tried to race me on the highway and passed me going 90, caught up in like a second and passed him haha, he had his floored...

This was late at night with like no one on the road..

But try blocking off the aiv tubes and seeing if that helps your stutter.

[BMAR240SX]

U got a manny transmisson

[Acecool]

Yep, manual trans :-(

[Logan76]

Did you ever end up testing your resistance? a grounding kit, if u find its above 2 ohms, is a good idea, and should improve your throttle response.

[BMAR240SX]

Yep, manual trans :-(

Why are u sad about having a mnanny trans thats something good not bad

[Acecool]

Stick is so much more fun :-)

Nah, havent tested any resistence.. On the plug cables or??

Not sure how, to be honest.. Autozone or so should sell a kit, right?

It runs rough when it is cold, but when warm it runs like a DREAM, omg like wow... shifts smooth and perfect, doesnt hesitate at all when warm (actuatly just a tiny bit every now and again, you barely feel it)

[Logan76]

No your checking your resistance of your electrical shlt, nothing to do with spark plugs. really in short, your trying to find out if your cars grounded good enough, so you get your ohm meter, and put one probe on your negative battery terminal, then you put the other on an unpainted screw on your car, if it reads above 2ohms or so, you may want to buy a grounding kit, or run some more ground wires, or check your current ones.

[Acecool]

Ok, I checked..

I tried with red or black on the negative terminal of battery, and the other end on an unpainted screw..

I tried an unpainted screw on the left side and got between 30 and 5 OHM...

Then I tried on another unpainted screw near the rear where the cruise control is and got like .4 or so..

So would that be a bad ground :-)

lol