URGENT! KA has bad misfire...need to fix it tommorow.

[njd07]

Ok everyone...I need to fix this 95 altima w/ (has around 200k)ka24de for a customer. If I can fix it im sure my boss will trust me enough to let me borrow his shop over the christmas holidays(we closed for 1 week)...meaning I could get some work done on my track 240sx(its winter here...so I cant work outside).

heres the issue:

car is running really rough...im pretty damn sure its only running on 2 cylinders(1 and 2)....3 and 4 I dont think are doing much.(i think this becuz when I unplug the injectors or unplug spark wires....the misfire doesnt change..stays the same...meaning those cylinders are down.

SO far I have tryed changing the distributor plugs, and plug wires. oh and btw the car wouldnt even start untill I changed the distributor. I listened with a stethoscope to see if the injectors were working...and they are. also tested each plug wire to see if they were giving spark...they all are. checked the timing and its good. ecu is not throwing any codes...


I dont know why the fuck its running so damn rough...like it idles around 700...but wants to die cuz its on 2 cyl....the minute i put it in gear and try to drive it dies unless I rev it really high. its shooting out so much fucking black smoke..we had to leave the door open for like 30 mins after lol. anyways I know its kinda late to ask...cuz we gotta have it out the door by tommorow. but if anyone has ideas/input I'd really appreciate it...thanks!!!

[Kougeki]

So you checked that two cylinders ran?
I had that happen once and it was a plugged Fuel Filter.
Maybe?
Have you taken out the Spark Plugs?
If they're wet or dry?
Timing?

[MURPHY]

so you're sure it has spark and it has fuel to those 2 cylinders? you may have a dead cylinder (2). I'd personally get a spark tester to see if spark is strong enough. and check resistance on injectors.

might be a BHG in between the 2 cylinders. compression test it last.

[S14DB]

Yeah I would say Blown HG or the spark plugs are shot. Pull them and inspect if they are fine do a compression check on all 4 cyls.

[Nismoknightska-t]

you might have 2 bad injectors..?? making it run super rich?

[kevtrinh]

intake manifold leak?

[njd07]

So you checked that two cylinders ran?
I had that happen once and it was a plugged Fuel Filter.
Maybe?
Have you taken out the Spark Plugs?
If they're wet or dry?
Timing?

ya I told my boss it might be the fuel filter. I'll test it tommorow.

I changed the plugs...took them out after I changed them and they are black...wet

me and boss checked the timing several times...its good.

[njd07]

you might have 2 bad injectors..?? making it run super rich?

would they still work tho? I listened with the stehoscope and they were clicking.

[JVD]

You're positive it's not the injectors? My bros KA ran so rough because of one bad one.

[SR20junkie]

check the coil packs themselves,if your going to do a clyender balance test, then take a spark plug off while the engine is idle running. then take easch spark wire off one at a time, and if you hear the rpms go up they work, if nothing happens then thats the bad cylender do an injector balance test, and see if the fuel filter is clogged check for a burn on the distributor cap. also you need to look at vacuum leaks! they can be anywhere on the hoses or even on the manifold other than that i dont know else to say w/o more info.
your welcome, john

[njd07]

You're positive it's not the injectors? My bros KA ran so rough because of one bad one.

well I have some injectors I could install from a ka24e...does anyone know if they are the same as ka24de's?

[welddrft]

If you say the injectors are working and the plugs are firing I would definitely do a leak down and compression test. That might help explain something. I would also double check if the orientation of those two injector wires arent backwards because each wire has its own injector.

[njd07]

Forgot to Mention tommorow I will be bringing a nissan consult wire that plugs into my laptop and gonna use the program nissan datascan....anyone got any ideas what I could look for with this program? gonna try it out...anything will help at this point.

[IRN]

no coil packs on a KA sr20junkie. your injector may be clicking but it could be clogged. try swaping over the injector plugs from known good cylinders to the bad ones. same with the spark plug wires. check for spark. dissy point might be bad. did you change cap and rotor?

[MURPHY]

check compression... lol seriously and leakdown that bitch. takes what like... 10 minutes.

for consult hmm you can check a whole bunch of shit. ever used it?

IRN it has spark on 2/4 the cylinders. but yea swap around injectors... (huge pain in the ass lol)

[njd07]

check compression... lol seriously and leakdown that bitch. takes what like... 10 minutes.

for consult hmm you can check a whole bunch of shit. ever used it?

IRN it has spark on 2/4 the cylinders. but yea swap around injectors... (huge pain in the ass lol)


haha i know i wanted to do a compression test....but the boss didnt think it was neccasary...im gonna do one when hes not looking lol. hmmm i wonder if my ka24e injectors would work...i have some...might aswell try.

[ericcastro]

And the retarded answer might be the wires are switched on accident. since you changed the dizzy, and it started running, but roughly. It could be a mix up at the dizzy. the wires would look the right length, but the order on top of the dizzy is off.
Seems dumb, but it happens. :)

[MURPHY]

nope they're top feed. wtf is your boss a tech or anything? where do you work...?

[njd07]

nope they're top feed. wtf is your boss a tech or anything? where do you work...?

haha...lol my boss is funny...im working at a small garage just me him and another guy. we dont have much equipment...i guess you could say its ghetto...only been working there for a month...so if I can get this thing out the door...im hoping he will trust me and give me the keys to the shop for the holidays.

[Nismoknightska-t]

it just hit me.. sounds like a leaky injector.. bad o-rings?

[njd07]

it just hit me.. sounds like a leaky injector.. bad o-rings?

ya I was thinking about it...but its my bosses call if he says he doesnt think its that Im not gonna argue with him...its his shop his rep. but I'd like to fix this altima...fixed 2 last week...but this one is just not cooperating lol

[njd07]

fuck I hate this altima...thing is sooo ghetto..shoulda seen the plugs on this bitch...so much corrision...owner said he never changed the plugs, the plug wires were corroded and seized to the plugs...it was a nigtmare chipping away at the left over plug wire that broke off inside...oh and the thing can be started with a screwdriver...and doesnt need a key at all lol. this car is the beater of beaters.

[importdude]

MAF!!!!
same shit happend to me
i chanaged injectors/ecu
ect
had good compression
had all 4 injectors fueling
had all 4 sparks

and a new maf fixed it


and it was the maf making it run 2 cylnders(maf was burned out)

big thanks to downshift_sideways on here for letting me barrow it before i buy it to see if it was the problem

[98s14inaz]

MAF!!!!
same shit happend to me
i chanaged injectors/ecu
ect
had good compression
had all 4 injectors fueling
had all 4 sparks

and a new maf fixed it


and it was the maf making it run 2 cylnders(maf was burned out)

big thanks to downshift_sideways on here for letting me barrow it before i buy it to see if it was the problem

Definitely check the mafs. My mom's altima started doing that and it turned out to be the mafs.

[njd07]

MAF!!!!
same shit happend to me
i chanaged injectors/ecu
ect
had good compression
had all 4 injectors fueling
had all 4 sparks

and a new maf fixed it


and it was the maf making it run 2 cylnders(maf was burned out)

big thanks to downshift_sideways on here for letting me barrow it before i buy it to see if it was the problem

well when I unlug maf,the car dies completetly.....so is it still possible the maf is partially working?

[njd07]

anyways im off to work....I hope I can get it fixed today

[Ninjabread]

haha good luck Ian, i have spare dohc injectors if you need em.

Tell your boss i'll give him a good price ;)

[statik]

You already left for work im assuming but I'll give you my store anyway... Happened to my friends GTI, first I figured it was the coils since the previous owner HACKED the power to the 2 and 3 coils. Replaced this coil harness, no change, compression test showed the leak between 2 and 3. It acted like a car running on 3 cylinders because the low compression effectively made those cylinders useless. So as others stated, do the compression test, it only takes a few minutes.

[DALAZ_68]

well when I unlug maf,the car dies completetly.....so is it still possible the maf is partially working?

try starting the car wiht the MAF disconnected...