my 240 is bogging bad

[yoni_nismo]

Ive searched and im dumbfounded. I was driving my car for about 30mins and was running fine and then I went into a bumpy alley and it started to bog. It would get speed gradually if I slowly press the gas pedal but as soon as I give it some gas like normal it would start bogging again. The car also idles perfectly fine but it starts bogging when I give it gas. See video for bogging clip

The car is a 95 240 with a stock KA
http://i306.photobucket.com/albums/nn259/essforteen/th_MOV00271.jpg (http://s306.photobucket.com/albums/nn259/essforteen/?action=view&current=MOV00271.flv)

The day before I seafoamed the motor but ran better after, I also changed the oil and spark plugs.
What ive done after prob started.
-swapped MAF
-fuel filter
-plug wires
-tps sensor
-checked plugs
-checked vacuum lines

Feel free to throw out any ideas

[krazyfil]

it has to be the maf sensor, cuz that exact same thing happened to me with my old coupe and i got the maf sensor replaced and everything worked fine afterwrds... other than that i dont know whut else it could be unless your fuel pump is shot

[yoni_nismo]

Thanks krazyfil, but thats exactly what i thought but i swaped the maf frm my other 14 but still same prob.

[duffman1278]

Did you make sure to cover up any areas that shouldn't have been seafoamed???

[yoni_nismo]

What should be coverd up?
It was my first time using it but i only used 1/3 of it through the brake booster vacume line and in nothing else.

[Giebs]

this happened to a single cam at school, we found out it's timing chain jumped a couple teeth. but i dunno, that might be too unlikely for your situation.

[krazyfil]

well if its the timing then it could be kinda pricey.. my buddy just had to get al that shit fixed.. but even still he asnt boggin out like that.. he just wasnt getting all the power he thought he should be getting.. he ended up spending around 1400 at a shop.. so lets hope it has nothing to do with timing lol

[yoni_nismo]

thanks for the responses, keep em comming.

i hope its not anything really expensive or i might have to get rid her.
its my daily and i need it 2 go 2 school

[essforteen]

thanks for the responses, keep em comming.

i hope its not anything really expensive or i might have to get rid her.
its my daily and i need it 2 go 2 school

yea thats my brother cursed with 240 problems:keke: and I end up paying cuz he's broke

[180sx_Drifter]

might be your fuel injectors shot. does the motor shake a lot even on idle?

[nastjuid]

Well, you've replaced the MAF and TPS, which I personally would have just tested for :P Have you tested your injectors? Seafoamed or carb cleaner'd the IACV?

If your injectors check out, you can't find any vacuum leaks, and seafoam in the IACV didn't work, you might need to actually pull the IACV off and give it a good scrubbing. But I think you'll find the issue when you do the injector test. It looks like it's hunting. Maybe google 'ka24de hunting'

good luck :)

[yoni_nismo]

The iddle is smoth and normal, my lil bro(essforteen) made the video and was pressing the gas at diffrent speeds to show the bogging the car doesnt idle like that.... I didnt have a voltameter but i had parts im only a mechanic when im broke and essforteen youl get my bill:keke:... il test the injecters and clean iacv 2morrow hopefully that works..

[krazyfil]

well if its injectors.. i have z31 turbo injectors for sale lol and ill get u a cheaper price than oem 240 injectors too lol

[Howard92884]

Check your fuel pump.

[tt99ol]

check all your electrical connections
one may be loose enough that it intermittently becomes disconnected
dont forget to check the crank sensor also
its on the tranny

[180sx_Drifter]

check the injectors sounds like you are running on 3 only.

[yoni_nismo]

Now another problem i went to start the car and nothing it just cranks but doesnt turn over so we checked the plugs and they were fouled and put another sset in and the same problem i think it is dumping too much fuel into the engine and flooding the engine is there any thing you guys might think the problem is?

[eye-5]

If you get it running agian, check the timing. That is pretty easy, free if you have the tools and definately could be the problem.

[CleanKAKouki]

the not firing makes me think its the fuel pump. take out the top half of your back seat, turn the key on (but dont try to crank), and listen. if you can hear any noise back there, then its priming and isnt the pump, but if its silent...i say time for a walbro. may or may not be it, but its worth a shot

[aNskY]

Now another problem i went to start the car and nothing it just cranks but doesnt turn over so we checked the plugs and they were fouled and put another sset in and the same problem i think it is dumping too much fuel into the engine and flooding the engine is there any thing you guys might think the problem is?


sounds like a leaky injector.

[essforteen]

thanks guys for the quick responces
we changed the injectors and the car runs and it still does the bogging thing my brother originally posted and we checked the fuel pump and it primes fine and we can hear it but the wierd thing is that it idles just perffect but it bogges if you try to press the throtle normally but if you gently press it it revs up slowly. any more info guys it will help tremendously cus he has to go to class tomorrow and i dont want to drive him all the way to fullerton
thanks again HELP US!!!

[Cedarcbr]

TPS? dunno just throwing it out there.

[nastjuid]

Ah, alright, i'm so used to seeing my car bog like crap when the throttle shuts, I assumed that was all foot off the gas. sorry bout that :/ Have you tested the FPR? When you checked for vac leaks, did you check for clogged vac lines? would be more likely in a 4mm line, though that's reaching.

Is the EGR still hooked up? hows the egr diaphragm?

Crazy how much that sounds like bad particle count. What did you set your TPS to at hard closed?

[yoni_nismo]

update!!!
changed all vacume lines, egr seems fine but will take out 2morrow and clean to make sure. I checked the timing its at 20deg and still boggs but when i advance it all the way it runs really good, but i dont want to run the risk of detination since im running 87octane.
what could cause this to be a issue

[yoni_nismo]

Oh yea Thanks for all the help keep um comming:hyper:

[essforteen]

update!!!
changed all vacume lines, egr seems fine but will take out 2morrow and clean to make sure. I checked the timing its at 20deg and still boggs but when i advance it all the way it runs really good, but i dont want to run the risk of detination since im running 87octane.
what could cause this to be a issue

morning bump we are still having the same problem any more input would help alot

[180sx_Drifter]

did u check any codes the ecu threw out?

[steve shadows]

The day before I seafoamed the motor but ran better after, I also changed the oil and spark plugs.


why?

You probably got water inside your DIST or Ignitor

[1sik240sx]

Check your water Temp. Sensor...

I found mine to be corroded, replaced it, and it didn't bog like that anymore

[punxva]

on a side note, when you seafoam you should change your o2 sensor as well, just a tip.

[yoni_nismo]

ecu has no codes, dist is dry and no carbon trail, changed both water temp sensor/sender 2day prob didnt have 2 but temp nedle is more steady.. swaped front o2 from my other car and rear is new... Im running out of ideas, what else can be causing the bogging?

[crzycav86]

Here's what I suggest:
Unplug the o2 sensor to force the controls into open loop. (maf-based sensing) See how the engine runs now.

If it now runs bad while accelerating AND slow/constant throttle, it could be anything from clogged fuel filter, dying pump, air leak(not likely though). But something fuel related. I say this because if the o2 sensor is controlling stuff, it will try to make the car run okay. This is bad because we want to diagnose what is wrong, so we want the computer to control the bare minimum.

-------------- or -----------------

If it still only runs bad while accelerating, I would strongly suspect a tps issue. Perhaps the connections to the ecu are bad(verify with a voltmeter or something). Or see if swapping ecu's fixes the issue.

If the latter is true, the reason why it bogs for sudden throttle accelerations is because the engine isn't getting the "acceleration enrichment" fuel compensation. This will cause a lean condition, and in your case, audible knock on tip-in. When you increase the revs slowly, the enrichment is not necessary because the revs' aren't really accelerating.

Replacing the tps would have been the first thing I'd do. But since you're still having the problem, I don't know... Hope that might point you in the right direction though.

Try looking more into the tps - take a volt-meter and make sure you're getting the proper voltage for 0 and 100 throttle. If that doesn't work, try swapping ecu's if you have a spare.

[NissanGuyB14]

i know this post is a few weeks old but i found it searching, my cousins car is doing the same exact thing and iv replaced so much shit, when checking the tps open and closed what readings should i get(im still searching the forums to see if anybody esle has/fixed the problem)

[deesz]

same thing happened to me i thought it was a bad maf but come to find out it was the plug i cut open the rubber boot around the maf to find out two of the wires were not pinned right they had come out... i repinned them and the problem went away.

[mifesto]

this happened something very similar to my old supra. found out previous week i was doing some splicing on the ecu harness and one of the ignition wire was severed, so i was running on 5 outta 6 cylinders. light throttle and it would drive ok but soon as u apply some throttle it bogs heavily.

i would verify all spark plugs are getting signal.

[tukn9s]

Could have a bad fpr.

[Blown240sx]

Car is def not running on all cylinders you can hear the miss when it comes back to idle a few times. Isolate the miss and go from there.

[essforteen]

we solved the problem it was a bad dizzy

[Twinturbozs]

dizzy meaning distributor?

[clark]

yes dizzy=distributor