my ka24E problem *help?!

[mmaxeyjr]

I know it's long but please read I need help! (this is my daily driver)

1990 240sx Ka24E

114k miles automatic...

New spark plugs, wires, distributor cap and rotor, z32 fuel filter, and new(er) iacv it's cleaned. Fresh oil and filter 500 miles ago. along with plugs, wires, and fuel filter.

It's been doing this for a while even before my oil change.

When I start up my car usually after it's been sitting for a few hours. It runs good, then soon after I believe it misfires, and it runs like this http://s128.photobucket.com/al...5.flv

Very shaky, terrible throttle response, exhaust putt putt's, smell of burnt oil, and gas?

When it's running like crap I pulled spark plugs 1 by 1 ONLY spark plug #1 doesn't make the engine bog down, but if I touch something and make it spark then put it back in it's place it runs good but soon after it runs like garbage again.

When it's running good I unplug spark plugs 1 by 1 and when the #1 spark plug is unplugged it boggs down like it should just like the rest.

I also noticed when I push down on injector clip #3 my engines idle drops. But when I do it to the others it does nothing.

I think my timing, distributor is off by 1 tooth (i'm not sure how to fix it) Also I noticed that it doesnt want to start sometimes, fuel pump, starter?

But lately it's been starting right up. I usually only get the starting problem when it's warmed up and I try to start it shortly after running it.

Also I'm thinking I need to replace fuel injector o-rings?

Any advice on what my problem might be? Also what should I get to fix my problem and have it running like a champ?

Thanks,

[mmaxeyjr]

bump

[mmaxeyjr]

no one has any ideas??

[t1mm@y]

with the injectors, check the wires. My wires were so old that when I wiggled the injectors back and forth they would occasionally not fire....

Just a thought?

[grecco28]

ok, look if i get it right, i think the problem probably is in your maf sensor check the resistors inside the maf sensor for dirt and wash them with a spray of carbcleaner or something, also make sure the timing are correctand check the fuel pressure as well.. this failure can be for many reasonsif your spark plugs are dirt with unburned gasoline (soft black deposits)then the failure is caused for exesive fuel in the mixture and this is caused for a defective maf sensor or in a very unusual case could be the ecm(happen me one time with a hardbody truck a we know is the same engine of you car)the problem was the ecm keep open one inyector as soon you turn the start switch to the on position but as i tell you before was very extrange, check the grounds as posible many problems for hesitation i solved was caused for bad ground contact.check the inyector resistance with a multimeter the correct value fluctuatesbetwen 12 - 15 ohms..ok, good luck i hope you be able to fix it or contact you nearest nissan dealer... just kidding..

[Silvia345]

yeah man check your maf. that probly the problem my messed up and the same symptoms happend. i changed for one from a junkyard and it worked good. good luck

[hellzknight]

carb cleaner will destroy the sensitive maf, use a mafs cleaner

[mmaxeyjr]

so a buddy told me the timing is off from the oil pump. and that's causing the distributor to be off. how can i go about fixing this? any write-ups?

but also the intake manifold is probably dirty.we cleaned the maf with cleaner 3k miles ago, should i clean it again w/ intake cleaner or something?

thanks

[Vegascorbin]

The oil pump and Dist. are dirven by the same shaft. That is probably what your buddy was trying to say.

Why do you think your timing is off? Have you put a timing light on the engine and checked it? Be sure to read your FSM and set the timing useing the correct procedure. NOTE: THE SOHC IS SET TO 15 DEG. BTDC not 20 as is used with the DOHC. While reading the boards it is easy to be confused between the two engines.

What did you clean the MAF with? If anything other than MAF cleaner then you may be in trouble. If possible swap your MAF with a friends. Easyest way to test.

[mmaxeyjr]

now we're thinking leaky injector due to o-rings also? any write ups on how to replace the o-rings? i bought some from napa but they charged me $41 does that seem right?

[mmaxeyjr]

bump... if anyone can explain "how to" replace injector o-rings, and fix timing through oil pump and distributor...

let me know

thanks

[fodojonny]

it's actually pretty simple. I don't understand why people have problems with this but alas, I've had 2 different hardbodies come in the shop with the same kind of issues. I don't have pics but I'm going to try to explain to you how to set the dizzy/oil pump timing. first off, when you have the oil pump and dizzy drive shaft out you'll notice that on the oil pump there's an arrow. on the dizzy shaft there is a small round punch mark. line the two up and bam. if your motor is at tdc on no. 1 then put it all together and you'll be in time. put a timing light on it to verify you did it right and you should be good to go. alldata is the program we use at the shop and i'm fairly sure you can get the program @ advanced auto. it has a step by step timing procedure in it. I hope you can figure this out. it suxs to have a car that runs bad.

[mmaxeyjr]

yeah it does suck.. pictures would help! let me know if you can get some

[fodojonny]

link to auto zone repair guide with pics of timing marks

http://www.autozone.com/az/cds...s.htm

[mmaxeyjr]

Okay we replaced the fuel injectors, and it hasnt acted like the video in a long time. and all cylinders are firing no more misfire

It's been running okay, but often I get a hiccup when the car is just idling at like 5-700 the car shakes and the rpms drop very slightly then go back up.

When I rev up to 1500rpms the car is smooth, non shaky and it doesnt hiccup or anything.

Also when I go to give the car some gas to drive it hesitates before going then it finally goes.

What could this be?

We checked the timing and when the distributor is cranked to full advance it's off by 1 tooth. When its retarded slightly the timing is correct.

So it's now set to slightly retarded rather than advanced.

Should I just seafoam it and go from there? haha I want this thing to run like a champ...

[mmaxeyjr]

bump, need help!!!

[mmaxeyjr]

bump....