Cylinder 5 misfire...HELP
Thread Starter
Joined: Nov 2006
Posts: 1,218
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From: Round Lake, NY
Cylinder 5 misfire...HELP I have been getting a Cylinder 5 misfire for some odd reason. It started about 120 miles ago, and it only does it when im in 5th or 6th gear, around 1500rpms. I just installed my Hooker long tubes and While I did that, I put in some new iridium plugs. Well, I also changed around all the coil packs and plug wires when I did the header install, thinking maybe if it was a bad wire or coil, It would show up on the other cylinder that I moved them too...which didnt happen.
My question is, If its not my plug, wire, or coil causing a misfire on cylinder 5, could it be a bad injector??? Thats the only other thing that makes any sense to me...but why is it only doing a misfire at idle, and 1200-1700 rpms in 5th and 6th gears??
My question is, If its not my plug, wire, or coil causing a misfire on cylinder 5, could it be a bad injector??? Thats the only other thing that makes any sense to me...but why is it only doing a misfire at idle, and 1200-1700 rpms in 5th and 6th gears??
Well maybe you have more going on...
Swap the injector to another cylinder first to see if you get a misfire in that cylinder. The injector might not be spraying well and at lower rpm's it doesn't have enough pressure to spray well. I thonk this may be the iss on my girlfriends '04 Explorer.
We have seen a few '01 cars lately having problems in the #5 hole. Ringlands are cracking and if they go to long will just get worse. See threads below... Do a compression test to check.
Hopefully just a bad injector and not like below...
https://ls1tech.com/forums/northwest-members/928560-7-cyl-ls1-mystery-solved.html
https://ls1tech.com/forums/generation-iii-internal-engine/930664-broken-cracked-ringlands-stock-pistons.html
Swap the injector to another cylinder first to see if you get a misfire in that cylinder. The injector might not be spraying well and at lower rpm's it doesn't have enough pressure to spray well. I thonk this may be the iss on my girlfriends '04 Explorer.
We have seen a few '01 cars lately having problems in the #5 hole. Ringlands are cracking and if they go to long will just get worse. See threads below... Do a compression test to check.
Hopefully just a bad injector and not like below...
https://ls1tech.com/forums/northwest-members/928560-7-cyl-ls1-mystery-solved.html
https://ls1tech.com/forums/generation-iii-internal-engine/930664-broken-cracked-ringlands-stock-pistons.html
Are you SURE you know where the #5 cylinder is? I only ask because I was having a bastard of a time with my father's BMW 740iL. It had a misfire on cylinder #1. I did EVERYTHING that you could think of and it didn't go away. Turns out, on BMWs, the #1 cylinder is in the front left if you're facing the car. Bad coil pack.
maybe a burnt wire on those headers, i know i have one thats melting away, i couldnt see you having a bad injector since your car ran fine before, i doubt its a burnt valve as well
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Verdad Gallardo Thread Starter
Joined: Nov 2006
Posts: 1,218
Likes: 0
From: Round Lake, NY
like I said...started doing it before the header install. NO plug wires are touching my headers....The Hooker headers have very good clearance...It is NOT a plug or wire issue
Car runs like a Raped ape at all RPMS and doesnt act like a misfire or a low compression issue in any cylinder at all....I only know its misfiring, because my SES is telling me so. If that wasnt up, I wouldnt have a clue. Car is not having any blue smoke issues...only smoke that comes out is a black puff when Im WOT and shift...other then that, its clear.
From a post above...I know exactly where cylinder 5 is...
Thread Starter
Joined: Nov 2006
Posts: 1,218
Likes: 0
From: Round Lake, NY
yah i did take it to john...misfire on cylinder 5. SES light is on....for the misfire and I have my rear o2's unhooked right now until i have them tuned out....
well, if you have already swapped plugs,wire,coil packs and injectors with another cylinder and the problem doesnt move/or go away that leaves mechanical(heads,valves,piston,rings ect....) or electrical(pcm wiring, corroded connector, rotted wire, pinched wire, or pcm corrosion...ect..)
does a scanner show your sensors operating in a normal function?
maybee a out of wack dirty maf? bad o2's? combination of any?
good luck
does a scanner show your sensors operating in a normal function?
maybee a out of wack dirty maf? bad o2's? combination of any?
good luck
