240 bogging causing major power loss.

[nisssan-drive]

You can see too the left of my name what kind of car it is. It has exhaust and intake filter on the stock ka24de.

Ok so i have been trying to fix this for a while know it started when my car wouldnt start and i had to push start it but, thats a different story it know starts. Like i said it bogs really bad and i have big power loss. Also i tryed replacing the mafs no luck. I was thinking it could be the map sensor maybe or a vacuum leak?Help appreciated!
Modified by nisssan-drive at 1:07 AM 1/13/2008

[240FeVeR]

You can see too the left of my name what kind of car it is. It has exhaust and intake filter on the stock ka24de.

Ok so i have been trying to fix this for a while know it started when my car wouldnt start and i had to push start it but, thats a different story it know starts. Like i said it bogs really bad and i have big power loss. Also i tryed replacing the mafs no luck. I was thinking it could be the map sensor maybe or a vacuum leak?Help appreciated!

Modified by nisssan-drive at 1:07 AM 1/13/2008

Sorry for being a school teacher, but when you subsititute "know" for "no" it's a little confusing for people who understand conventional english.

The car doesn't have a map sensor, it has a mass air flow sensor which you already replaced, so thats not the problem.

Lastly, if you suspect its a vacuum leak....why the heck don't you go check and see? Are you waiting on someone from the internet who can't see your car to tell you that they suspect it's a vacuum leak too before you go check it?

It sounds like you're handy, so check a few things to rule out the basics. If you get it fixed, great..if you don't then we'll know what not to suggest.

[skaterfromvt]

Sorry for being a school teacher, but when you subsititute "know" for "no" it's a little confusing for people who understand conventional english

In reply to what you said...

First of all this is not an english major classroomQuit flattering yourself! In the real world where we use colloquial language!! which im sure you must be familiar with!!! we understand what the person is trying to say!! I found throughout my tour of 10 different countries!! that people who waste their time with correcting the spelling and mechanics of others usually have no other achievements to boast upon! so they can feel good about themselves atleast in one little way! now instead of correcting our/ everyones spelling mistakes reconize that this is a colloquial board where we are all here for car problems or others not english lessons!

now look back at what you wrote...."know" for "no" im sorry to inform you but i believe the user actually ment "NOW" not "no" now you see why we dont waste our time with spelling and that we are here for solutions! quit the games, and boasting b/c its obvious that spelling is the only thing you are so great at!!!

Now addressing the bogging issue

Does it bogg only when you give it full pedal? try applying the gas pedal lightly and see if you can get it to rev up with out bogging out...

also if i were you i would check the Throttle position sensor...if that comes loose you'll get nothing...Im still working with my 24ka but mines turbo'd so im running into all kinds of problems..with bogging out...also could be your fuel pump

Good luck

[240FeVeR]

First of all this is not an english major classroomQuit flattering yourself! In the real world where we use colloquial language!! which im sure you must be familiar with!!! we understand what the person is trying to say!! I found throughout my tour of 10 different countries!! that people who waste their time with correcting the spelling and mechanics of others usually have no other achievements to boast upon! so they can feel good about themselves atleast in one little way! now instead of correcting our/ everyones spelling mistakes reconize that this is a colloquial board where we are all here for car problems or others not english lessons!

This isn't a world where we're talking to each other, we're typing to each other. If you're seeking help then it would be best that you can put yourself over as clear and concise as you can so that readers can understand and possibly assist with the problem. Is that hard for you to understand?

now look back at what you wrote...."know" for "no" im sorry to inform you but i believe the user actually ment "NOW" not "no" now you see why we dont waste our time with spelling and that we are here for solutions! quit the games, and boasting b/c its obvious that spelling is the only thing you are so great at!!!

You just proved my point. I'm glad you could have deciphered that "know" meant "now", as you can see, not all of us can. Frankly speaking, not everyone wants to have to try and figure out what people are trying to say.

What's with this mention of boasting and all the other stuff? You really over analyze things don't you?

[nisssan-drive]

Ok thanks for letting me know about the map fever i am new to cars so don't NO much about them.Also before taking the manifold off and replacing about 30 hoses i was waiting on a little bit of advise. Would hate to get out there do all that and it not be the problem.

I have done as much as I could considering how much i know about cars.I took it to a mechanic,replaced mafs, and found a couple vacuums that were cracked thats all.The mechanic said the vacuum hoses were causing my problem to replace them but theres only a couple small cracks that you can see when moving the hose to kinda stretch it out.Could these cracked hoses actually cause the problem?

[gumby74]

Realistically probably not.Does your car have that annoying air injection crap on the header? I have a friend who was suffering from similar symptoms. It sounded like the engine was under water at one point. Anywho, that tube that goes around the engine from the intake mani to the header was plugged to hell and back with soot and grime. We cleaned that out with some bailing wire and strips of rag. Ran like a champ quickly after.Also, if you have a multi-meter and a manual, you may want to go over your sensors and verify output.Also, I am not certain if your engine has a knock sensor. Something else you may want to check out.Lastly, since we are about correctness, you used "no" in the first line. Should be know.I however, am just messin' wicha'.

[240FeVeR]

Ok thanks for letting me know about the map fever i am new to cars so don't NO much about them.Also before taking the manifold off and replacing about 30 hoses i was waiting on a little bit of advise. Would hate to get out there do all that and it not be the problem.

I have done as much as I could considering how much i know about cars.I took it to a mechanic,replaced mafs, and found a couple vacuums that were cracked thats all.The mechanic said the vacuum hoses were causing my problem to replace them but theres only a couple small cracks that you can see when moving the hose to kinda stretch it out.Could these cracked hoses actually cause the problem?

You don't need to remove the intake manifold and all the hoses to check for vacuum leaks.

If you had mentioned that a mechanic told you about vacuum leaks then we could have helped you along those lines. Vacuum leaks can cause the problem you're describing.

Buy a can of throttle body cleaner. Warm up the engine and while it's running spray the cleaner around the engine bay where you see vacuum lines. If you notice a surge in the idle then you've found a leak and that line needs to be replaced. While you're at it, clean out your throttle body.

[nisssan-drive]

haha yeah noticed the know!

Any way thank you now when i go out to take my manifold off I will have a couple other things to look at. For the "air injection crap" on the header i am not sure ill have to go check.

Yeah its too dark cant just go check the stock heat shield is covering the header, but i dont think theres any thing like that on my car.
Modified by nisssan-drive at 7:54 PM 1/13/2008

[nisssan-drive]

ok i am definitely going to do what you said, but the mechanic said to get to the hoses he had to take the manifold off this is where i am getting the idea from . There is hard to reach hoses under my manifold and also under my stock intake right?

Funny you say to wait until its heated because i for got to mention that it only happens when the motor is heated.

Modified by nisssan-drive at 8:17 PM 1/13/2008
Modified by nisssan-drive at 8:45 PM 1/13/2008

[s13vert]

I was having the same problem with mine, and tried looking everywhere! Turns out, the previous owner had some "performance" spark plug wires. One of the boots had a tiny pinhole in it right where the wire connected to the plug. That in turn caused the spark to shoot through the tiny hole and fire against the valve cover instead of the spark plug. I replaced the wires, along with the plugs (apparently one of the plugs was wrong too, which probably didn't help matters either!)

Before that discovery, I had changed all the filters, PVC valve, quite a few hoses,the distributor cap and rotor, cleaned the MAF sensor, and checked the O2 sensor, only to have that not work. I could have sworn that I had changed the plugs, but I think I didn't because the previous owner said they did right before I bought it.

If its been a while since the plugs, wires, cap or rotor have been changed (or you don't know when the last time was), I would replace those that you haven't recently. If that doesn't solve it, look into replacing the fuel filter next. I hope this helps! Keep us informed on what you find!

BTW... I just read that it happens when the car was warmed up already... electrical current flows better in warmer temperatures, so something electrical seems even more likely!
Modified by s13vert at 6:16 PM 1/14/2008

[nisssan-drive]

Oh good advice ill take a closer look at the plugs and let you no if that is causing my problem.

As for replacing some thing i no the owner replaced alot of things externally on the engine bay wires being one of them for sure so i think i am good there. Yeah I just bought the car in october so. Also just yesterday i went to start it up and it started bogging right away.the motor shakes pretty damn bad too

[s13vert]

Still sounds like bad spark or clogged fuel filter at this point. Pull all of the wires and look for what looks like dust (basically a white discoloration coming from a single point) just to make sure. Supposedly those wires were "pretty new" as well. My pickup that had a KA24 bogged down pretty bad and it was the plugs, my 240 bogged down which turned out to be plugs and wires... these things get finicky if they don't get the spark they are looking for!

[nisssan-drive]

Wish i could do all this things but... its raining and has been for hours.Yeah i am garage less so i will try these things tomorrow.

[sirgilbert357]

haha yeah noticed the know!

Any way thank you now when i go out to take my manifold off I will have a couple other things to look at. For the "air injection crap" on the header i am not sure ill have to go check.

Yeah its too dark cant just go check the stock heat shield is covering the header, but i dont think theres any thing like that on my car.

Modified by nisssan-drive at 7:54 PM 1/13/2008

If your car is mostly stock, Im betting you DO in fact have this pesky little box. Here is a link that will be rather helpful. -->> zerothread/253879

Its not really under the heat shield, although it comes from part of the exhaust system...Looking from the front of the car, stand directly in front of the airbox or air filter and look for a rubber hose that connects to the intake AFTER the filter, but BEFORE the MAF sensor. Follow that tube straight back (towards the steering wheel), it goes to a black box (see pic in link) that should be slightly higher than, but almost directly across from your header/heat shield. That black box may be your issue. My 93 was doing the hesitation and bogging down thing after warm up too. I just cut that hose and plugged the half of it leading to my intake with a huge bolt from Home Depot (5/8 inch I believe)...left the hose coming FROM the black box open to the air. Car has pulled way better and stopped bogging down on me since that very day (you can kinda smell exhaust after a nice WOT pull though). But, I would certainly change your fuel filter too (get the one for the 300zx as people say it fits but is less restrictive) and make sure if you do pull your spark plugs to check the gap (stock is .42 - .44 I believe). Check your wires for holes like the other guy mentioned while your there! Oh, and I'm not knocking you, but correct spelling is helpful, cause when I first read your post I was like "Huh??" Had to go back and re-read it, lol. Good luck, bro, don't get discouraged, this sounds easy to fix once you find the issue...

[nisssan-drive]

yeah i think your about the 4th person to tell me that.

hmm... thats weird whats this box called so i can figure out why its on my car?

[nisssan-drive]

Ok im not doing good so far with my car.

I checked the plugs that can't be the problem because they look brand new no cracks no nothing. Or well there is a tiny cut on one of the spark plug hoses but im sure its not deep enough to cause any problems. I opened up all the wire plugs to see if there was dirt or dust in them but... nothing. All though for today I could only check the ones at the top of the engine bay since it rained ALL DAY yesterday and is still very wet.

Also i checked for cracked hoses and only found one. I sprayed it with throttle body cleaner nothing changed no change in idle or any thing. I know there's more than that but now i am positive that they are under the manifold. I was going to clean the throttle body but, it was too dark outside to see anything. Ill do that first thing tomorrow.

Maybe this info will help those trying to help me some how. I think I mentioned that my car wasn't starting before. Well before i figured out all I had to do was push a button to start it. I changed the starter, tried jump starting it and, opened up some wire plugs. After none of that worked i was forced to push start it and of course that worked so I decided to go to the store. It drove fine on the way to the store but on the way back it started bogging. This was when it first started.