Miss fire between 1k-3k rpm?

[PulsarDet]

I guy's I have a big issue and I am not able to source the problem, the car is miss firing between 1.5k and 3k, if the car is on boost the car run fine, if not on boost the car has some serious driveability, I check all the sensor they are all connected, check ecu for code, their is no code at all, I change the maf cause i got one spare, nothing has changed. The car don't burn any oil or prestone.

Any idea ?

The last time I took the car was running strong and no prob at all. Just appeir during the night .

The problem append when the car is cold or hot. It just doesn't matter, I change the igniter in case but still no fix.


Modified by PulsarDet at 6:20 PM 11/4/2005

[Loofee95SE]

interresting, a friend of mine is having teh same problem, after he grounded out a hot wire, fix the wiring got better but still having some issue with it.C

[yourmomsrps13]

mine did that and i went nuts trying to diag, it...turned out to be a oxidized injector connection and or coolant temp sensor

[dattodude]

Changed the plugs? Make sure you are using the recommended ones (with correct gap) .Checked and cleaned the coolant temp sensor connector (red connector)?Could also be a dud coil. But as it happens hot or cold, probably not that.

Maybe dirty earths? Again less likely.

[PulsarDet]

I did order those spark plug NGK bcpr6es-11 are they good, I took it from the shop manual from the ca18det 180sx cost about 4$ each I heard putting platium with hight boost it's not recommanded does it true ?

[Loofee95SE]

we swp the plugs, it did help, the funny thing is, before this happen, we have to lean the S-afc, then after this happen we have to add it.. But i suspected the temp sensor aswell, will tell him to check it out ( yes u Jason) C

[Not_a_sr]

also test your alternator, possibly bad my missfiring was right at -2to .5psi of boost, seemed to be always in that area of the vacum/boost readings....

mine was missing really bad the last few weeks. turns out my Chipped ecu is acting funny and i was running dangerously lean at all times.

[yourmomsrps13]

Im still haveing rgw sane issue, I replaced the CTS and also found my injector connector was corroded, cleaned it and now im running much much better.BUTIm still running really rich , and i have a stumble misfire at 3,000- 3,300. stalls when i come to a stop and also my ECU gets hot

[dattodude]

The platinum ones for up to 18psi will be fine. And you shouldn't have to replace them for 60000 miles.

The symptoms you are describing are that you either aren't getting enough spark, or not getting enough dwell (charge time on coil).

During the 90s I tried several sorts of plugs (apparently suitable for the CA18de/t), and I found some of them wouldn't last longer than 2 weeks of city driving. The type in particular were "Champion copper".

I went back to using NGK platinums and the problems went away.I used to find that NGK regular plugs would last 6-12 months. Definitely better than other brand plugs in the same price range.

People say that with the standard ECU/Ignitor/Coils, you need to reduce the plug gap when running above 14psi.

For my CA18det, I'm now running Bosch Super-4s, but I'm also running Autronic CDI, and external coils, so getting enough spark is not a problem anymore.

[capwred]

ok im still have this problem a little(as loofee said).so far we have done this.install 3 new coils,tryed 3 set of plugs(denso copper,ngk copper,and my old ones ngk irriudium spelling and this work the best).checked and changed the ecu,rewired the burned wire,checked the maf,tooked the entire upper ca wiring harness out and checked it for shorts in it,i havent checked the temp sensor yet.but will do it soon.im up for anything.but what i cant get is that before this happen i had to take fuel away from it for it not to run so rich and now i have to give it more fuel alot more to make it even run ****ty.im thinking that a injecter might be messed up.as soon as i find out what it makes it better i will post it up.

[SeVa-S13]

Is everyone's timing set properly?

[yourmomsrps13]

Is everyone's timing set properly?

person on here told me the 4th marl from the left clockwise was 15*BTDC and then i looked on the FSM and it sayes that the 5th mark is 15*BTDC

i believe im still on the 4th markcan I/we get a conformation?

PS: that is the GREATEST license plate i have EVER seen SeVa-S13 LMFAO (also probly cause im from NY)

[capwred]

im set at 15*btdc. im thinking about taking of the front cover of the timing belt and check to make sure the belt hasnt jump one spot.

[sideways danny]

do you run a lambda sensor? try un plugging it, if your problem stops then you have you're culprit

[mikesim]

person on here told me the 4th marl from the left clockwise was 15*BTDC and then i looked on the FSM and it sayes that the 5th mark is 15*BTDC

i believe im still on the 4th markcan I/we get a conformation?

PS: that is the GREATEST license plate i have EVER seen SeVa-S13 LMFAO (also probly cause im from NY)

it's the 5th mark. they go from -5, 0, 5, 10, 15, 20.

[capwred]

do you run a lambda sensor? try un plugging it, if your problem stops then you have you're culprit

what is the lambda sensor?and where is it located?

[SeVa-S13]

He means your O2 sensor.

[capwred]

ok i think i found out what was wrong with it.i disconnected the o2 and its running good now.im going to drive it around somemore tonight to see if it keeps running good.

it is ok to not run the o2 sensor right?i have a safc2 to make sure the fuel and air is ok.thats what the o2 sensor did anyways right?

and thanks slideways danny.i was going to do this before but i was told that couldnt be it.

[sideways danny]

with the Lambda (O2 sensor) unplugged you get put on a safe mode so will run rich. it only works upto 3k rpm (that's why it was only bad running upto 3k) so your on boost map won't be affected.

don't scrap the sensor yet, check the plug wiring, I've had wires go brittle and break

[capwred]

the wiring is all new.i rewired it from the start to the finish.since it puts it in the safe mode which makes it run rich i can just lean it out with thesafc2 then.someone on here said that they wasnt running a o2 sensor and i cant remember who it was.

[sideways danny]

I'd get another sensor personally

[slownslurious]

they aren't too much...

[capwred]

do i use the one for the nx se our what.i guess i can look that up.

[slownslurious]

99% sure the ka one will do.

[PulsarDet]

I find my problem, was a O2 wire , the +12v was cut! so make a little reweld and fire and run fine now. !! The stupid ecu din't get me code so I was pretty was ok but still. Stupid OBD-0 lol

[capwred]

when the o2 went out on my ca it never gave a code either.