LT1 Miss fire
04-03-2008, 09:11 PM
#1
Staging Lane
Thread Starter
Join Date: Feb 2007
Location: Startex, SC
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
LT1 Miss fire 1997 b4c miss fires at mid to high rpm only if you gradually go through them. if you mash it it does fine? iam lost had a simular problem a year ago and replaced the opti spark, ignition module, coil, and all the wires and plugs any help out there.
Optispark fixed it last time.
Optispark fixed it last time.
04-03-2008, 09:35 PM
#2
TECH Regular
iTrader: (3)
Join Date: Apr 2007
Location: Greenville, SC
Posts: 477
Likes: 0
Received 0 Likes
on
0 Posts
is it sputtering as you slowly accelerate holding the pedal in one spot or does it happen as you roll into the gas if its when you roll into it, it may have something to do with your TPS.
04-04-2008, 07:23 AM
#5
Staging Lane
Thread Starter
Join Date: Feb 2007
Location: Startex, SC
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
yea it has thrown the code several times and it is more so the holding the pedal in one spot but if you roll into to it real slow it starts missing about 3500 on up nut it is real sparatic not like a dead miss or from like a wire or a plug.
04-04-2008, 10:55 AM
#7
11 Second Club
iTrader: (7)
Join Date: Sep 2006
Location: Lancaster, PA
Posts: 319
Likes: 0
Received 0 Likes
on
0 Posts
im experiencing the same thing, but at idle. if its idling it will start to drop a cylinder or 2 and pop thru the exhaust, backfires like hell, but once i get it out on the road it runs like a champ. possibly bad injector due to the pulses is one thing i could reccomend about checking, but mine is batch fire, 93 wiring systems SUCK!
Trending Topics
04-04-2008, 03:47 PM
#11
Staging Lane
Join Date: Feb 2008
Posts: 69
Likes: 0
Received 0 Likes
on
0 Posts
if the o2 code is for a front o2, change it. My car misfired like hell and I changed the front o2's, and it got much better but didnt solve the misfire compleatly. Im thinking maybe im just running incredibly rich, and just went ahead and ordered my pcmforless tune to see if that fixes anything. If not, I guess ill be messing with the opti.
04-04-2008, 04:37 PM
#12
Staging Lane
Thread Starter
Join Date: Feb 2007
Location: Startex, SC
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
the o2 is for sensor 2 bank 2 but it is also throwing an evap code and i just got done puttiing a new ignition coil on i had on the shelf from last time and it changed nothing if i do end goin with a new opti what brand shhould i go with?
04-05-2008, 10:59 AM
#15
Launching!
Join Date: Aug 2005
Posts: 231
Likes: 0
Received 0 Likes
on
0 Posts
Bank2 sensor 2 is nothing. Its the post cat eff. sensor. Let me think out loud for a sec. Newer opti, coil, filter, Does not do it at WOT just cruising up. Try this. I am going to try to stay away from the expensive *** o2's. Try un hooking your maf and see how it runs. When you unhook the maf it is going to try and stumble. Dont let it die. You will force the PCM in to SD mode. See if that helps. Also I know you said you just replaced them but plz do check the wires again. Make sure one did not get cooked, or start to arc. If you get a chance pull the #5 plug out and see what it looks like. This should be a pretty quick checks. Yes there is a reason I ask for you to look at specifly #5 plug.
04-08-2008, 01:33 PM
#16
Staging Lane
Thread Starter
Join Date: Feb 2007
Location: Startex, SC
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
tryed the maf and did not effect anything but now the car will not throw a missfire code but is still stumbling all over it self. i checked the plug wires and they look fine but i have not had a chance to pull the plug.
04-08-2008, 02:34 PM
#17
Launching!
Join Date: Aug 2005
Posts: 231
Likes: 0
Received 0 Likes
on
0 Posts
Ok lastly. Tripple check everything, vaccuum leaks the works. My question is does it stumble right from first start of the morning or does it just do it when it warms up. If it does it right from start up I would look at the opti again. If it only does it when warm I would change the o2's and clear the Fuel trims.
