Daily: misfire (pic of plugs shows which cyl)

[Shifty]

hey guys

i have a 4cyl TE magna as a shitter. it's a single cam 4G thing.

anyway it's developed a misfire, none of the plugs looked any different so i put in a new set and took it for a drive for 20 mins & this was the result.

Any insights into general condition (plugs 1-3) and most particularly the reason that cyl 4 looks different.. fair to say that it's the one misfiring although i suppose it could always be all three of the other cylinders, just intermittently.

a little rough on idle & off idle, very light load (eg. take off down hill) it's fine but taking off on a flat bit or uphill, or any real load, it misses. high rpm free-rev it seems to clear out.

[Peter UC]

I would first be looking at leads, distributor cap or rotor button. Had a similar problem on my old 626 turned out to be the leads

[Billzilla]

Pots 1 -3 are too lean.
#4 looks okay.

[Shifty]

Is there a consensus on that being the case?

Might grab a fuel filter and see if there's any improvement..

[joebloggs]

Yeah the white deposits look lean. Does the fuel come into the rail at the #4 end? This might explain the 1 neutral looking plug. The filter makes sense as does the pump but its more expensive / difficult to replace.

[Shifty]

Yeah that's what I was thinking, the rail inlet is at #4 cyl... hopefully just filter.....

[Terribleone]

So it has a miss on idle? Have you tried narrowing down which cylinder isnt firing properly? Check the leads, cap and rotor like others have said. Changing fuel filter may help but its rare to have a missfire unless its completely blocked.

[MRMOPARMAN]

Pots 1 -3 are too lean.
#4 looks okay.

quite often you will get that result if a cylinder is missfiring, because the misfiring cylinder will be throwing fuel into the exhaust. the oxys think the engines running rich, so the computer leans out all cylinders, hence 1-3 look lean.

[Shifty]

Ok well it has a new fuel filter.

No improvement.

[MRMOPARMAN]

like someone else said. check cap, rotor, leads etc. swap plugs in cylinders to see if the problem follows the plug or stays with the cylinder. do a comp test.

[dogsballs]

quite often you will get that result if a cylinder is missfiring, because the misfiring cylinder will be throwing fuel into the exhaust. the oxys think the engines running rich, so the computer leans out all cylinders, hence 1-3 look lean.

my vz does this (if the cunt runs). i had shit leads even though the resistance read ok.

[JohnMcSandyVag]

Pots 1 -3 are too lean.
#4 looks okay.

x2

White = not good.

Does said shitter have an air flow meter?

[Shifty]

x2

White = not good.

Does said shitter have an air flow meter?

I generally try to avoid looking under the bonnet, but fairly sure is afm.

[millsi]

Needs more fuel heater

I had a 4gxx magna and it did the same thing but only at idle, never fixed it though the leads did like to come off the dizzy when under load sometimes.

[Shifty]

solution fit 1uz & turbo?

[JohnMcSandyVag]

Clean the air flow meter!@ Wd40 and a paint brush worked for mine but apparently there is a specialised AFM cleaning sprey available from supercheap that doesn't leave a residue.

Might be lucky.

[oioioioioi]

Non residual electrical contact cleaner. Not WD40...

Electrical shop or maybe Supercunts.

[Shifty]

hotwire type i assume you are referring to?

[myliberty]

Brock Polarisor will get it running smooth

[Sketchy]

It's a magna and you work in insurance. Burn it and laugh all the way to the dealers to buy a less shit car.

[Shifty]

Years of poor financial decisions see a Magna as a necessity rather than a choice

[MRMOPARMAN]

Dont say that dude. Magnas are never a necessity!

[myliberty]

Years of poor financial decisions see a Magna as a necessity rather than a choice

This is incorrect.

I just sold a one owner reliable registered serviced subaru liberty in great nic with great interior and faded paint for $400.


Mshitsubishi can die in a fire.

[bigmuz]

Trying to read the plugs is futile when it is misfiring.

Try swapping leads, clean the wire in the afm (not with wd 40 for fuck's sakes, use contact cleaner or acetone or something), wiggle all the plugs around.