Right to the point…
I’m pulling the obd2 code for “Cylinder 1 misfire”
*New plugs
*Spark is great
*Timing is on
*Compression is equal and solid across the boards
I just need this code gone so I can have it pass inspection.
I’m just about all set to do the srt 2.4l swap (just waiting on a 3.55 trans), so I don’t want to get overly carried away on the 2.0l.
any suggestions?
*3.55 trans, and when i had a tech at lexus do a comp. check it was not even across the board… hmm
[quote=“Slopoke,post:2,topic:30438"”]
*3.55 trans, and when i had a tech at lexus do a comp. check it was not even across the board… hmm
[/quote]
yes 3.55 trans…sorry, it’s early and i’m half awake at work.
I’ll run the compression check again.
If that turns out to be the case, I’ll just have to hurry up with the swap.
any other thoughts?
Has it come back after you cleared the code?
Check the resistance across the coilpack?
[quote=“brent_strong,post:5,topic:30438"”]
Has it come back after you cleared the code?
Check the resistance across the coilpack?
[/quote]
Yes it came back after clearing. Twice now, actually. So it is persistant and constant.
I have not checked the resistance… How would I go about doing that? Voltometer comparison on each lead? What data would I be looking for?
And if the resistance is not equal, should I assume the coilpack is bad?
Specs should be in the FSM. Here is a bit of info.
http://forums.neons.org/viewtopic.php?t=281066&highlight=coil+pack+resistence+resistance
[quote=“brent_strong,post:7,topic:30438"”]
Specs should be in the FSM. Here is a bit of info.
http://forums.neons.org/viewtopic.php?t=281066&highlight=coil+pack+resistence+resistance
[/quote]
Ok, I will use those specs when I test it with the multimeter… However, his issue was a lack of spark, and I have plenty… So I’m going to assume it isn’t my issue. Unless, under compression, I’m losing that spark for some reason.
In theory, if cyl.1 and cyl.4 fire at the same time, could I simply reverse those plug wires and see if the code switches from cyl.1 misfire to cyl.4 misfire…? That would show a bad coil/plug wire/plug, correct?
If not the case, then I should assume this is most likely a compression issue, due to either rings or valve seals… correct?
Also… Could this code be sprung due to a faulty injector (dirty, broken, whatever)? If not enough fuel makes it to that cyl, would it cause a misfire?
I’m just bored at work brainstorming… so any discussion is welcome.
I like learning new things…lol
yea, could be injectors. How is the headgasket?
[quote=“intense98rt,post:9,topic:30438"”]
yea, could be injectors. How is the headgasket?
[/quote]
Headgasket is solid. No leaks externally.
I changed the oil and there was no coolant in it, and the coolant is staying full and green. SO i’m thinking it should be fine internally as well.
I don’t appear to be burning any oil either… Unless it is so minute that it isn’t causing smoke, and isn’t noticeable on the dipstick… but i would think that such a small amount wouldn’t cause a misfire either…
then check your injectors. That was the cause of the misfire on the '95 neon that I had along with dirty fuel rail. The car also only misfired under load. Also, if it was the piston rings or valve seals then most likely you would see oil on the spark plugs.
id say if its a metal fuel rail it may have rust in the injector , ive changed many but its usually the last in line , and pretty much caused by the steel rail and no fuel return from the rail. if it comes down to a coil pack tho ill give ya one for 20 bucks
if ya think its an injector tho try and ohm them all out one will be high if its stuck , or switch it to non miss cyl
also if ya need any help i can get ya specs for damn near anything just need year make model and engine i have identifix at the shop
[quote=“yunvme666,post:13,topic:30438"”]
if ya think its an injector tho try and ohm them all out one will be high if its stuck , or switch it to non miss cyl
also if ya need any help i can get ya specs for damn near anything just need year make model and engine i have identifix at the shop
[/quote]
It does have a metal fuel rail. I’ll definitely look into that when i get home.
I’ll be in touch for specs, i’m sure. I’ll also let you know about the coilpack.
also, it’s a 1998 neon r/t, 2.0 dohc mtx.
[quote=“intense98rt,post:11,topic:30438"”]
then check your injectors. That was the cause of the misfire on the '95 neon that I had along with dirty fuel rail. The car also only misfired under load. Also, if it was the piston rings or valve seals then most likely you would see oil on the spark plugs.
[/quote]
That’s what i thought too. Each time i’ve pulled the plugs they are clean.
First i’m going to test the injector ohms, then I’ll test the coilpack.
If that doesn’t provide anything, I’ll have to re-check the compression.
thanks for the info.
Swap the plug wire around with a Cyl 4. See if your misfire becomes a Cyl 4 misfire. If so, theres ur problem. Otherwise, I distinctly remember watching the tech @ Lexus do the compression test, and one of the cylinders were very low.
P.S.- Don’t do the 2.4 swap…its not worth it. Trust me.
The SRT 2.4 setup is incredibly worth it. Trust me.
[quote=“brent_strong,post:17,topic:30438"”]
The SRT 2.4 setup is incredibly worth it. Trust me.
[/quote]
Yes, but the NA 2.4 is not.
But since he said he was doing the SRT 2.4 setup, I don’t see how that matters.
[quote=“brent_strong,post:19,topic:30438"”]
But since he said he was doing the SRT 2.4 setup, I don’t see how that matters.
[/quote]
+1
SRT swap, not just 2.4.
I just got home from work and will be running all afore mentioned tests in a little bit… so we’ll see what I find out.