missfire when started warm.
02-28-2009, 03:44 PM
#1
missfire when started warm. UPDATE !!!!! I'm having a issue... Today, (and this is not the first time it happened), I drove maybe 10 miles to break in my new rear gears. So for the cool down period I spent some time at a car wash, about 15 min elapsed and I was on my way back home. Start it up, seemed fine started to pull out and it just fell on its face.
It was misfiring like crazy, but not long enough to set the ses light which is why its so hard to diagnose. The car is basically stock with minor bolt on's like Lt headers, 52 mm bbk and a madz28 tune.Most of the sensors are new, except for the injectors. the opti has 151k on it with a new cap and rotor. If anyone has any clue what the hell is going on don't hesitate to reply.
It was misfiring like crazy, but not long enough to set the ses light which is why its so hard to diagnose. The car is basically stock with minor bolt on's like Lt headers, 52 mm bbk and a madz28 tune.Most of the sensors are new, except for the injectors. the opti has 151k on it with a new cap and rotor. If anyone has any clue what the hell is going on don't hesitate to reply.
Last edited by TransAmdriv3r; 03-04-2009 at 12:44 PM.
02-28-2009, 04:07 PM
#3
thanks !
03-01-2009, 02:17 PM
#6
Thats just the thing, it doesnt do it except when I restart the car after Ive been driving it for a while. Ill restart it, idles fine, start to give it alittle gas, still fine and as soon as I give it about 1/4 to 1/2 throttle it will miss and then Ill floor it and the miss will clear up and never do it again.
I got the other icm in now, I just need to drive it.
I got the other icm in now, I just need to drive it.
03-01-2009, 02:34 PM
#7
Launching!
iTrader: (4)
Join Date: Jul 2008
Location: Laramie, Wyoming - 7220' elevation
Posts: 201
Likes: 0
Received 0 Likes
on
0 Posts
Please tell me what you find out, my car is going the exact same thing!!!! As soon as it gets just hot enough I experience misfire. I suppose it doesn't help that my headers go forward right past the ICM to feed the turbo. haha.
Trending Topics
03-04-2009, 02:24 AM
#8
Staging Lane
Join Date: Nov 2008
Location: Fresno ca
Posts: 63
Likes: 0
Received 0 Likes
on
0 Posts
Im having a problem like this. I start it up its okish.Shortly after There is noticeable miss fires but you feel it mainly under 2.5k. The car still idles/ has power but mainly dosnt die. Once in a while ill hit a big bump and it cuts out for a brief second. I havent a clue where to start. I just put new plugs and wires on it.
03-04-2009, 12:43 PM
#10
Update !!! I took it for another long ride, stopped for 10 or so minutes, came back out. I started it (again, seems to start well) started to pull out and it happened again. So, This is after I swapped with a good oem GM icm.
Now, I was just checking things out and I notice underneath my oil cap and in my larger rubber lines there seems to be this yellow goo, smells very strong of gas, it even swelled up the rubber line to the pcv valve and the line from the breather to the throttle body. I think I may have some issues with either the coolant temp sensor to the pcm, 02 sensors or injectors. what do you think !
Now, I was just checking things out and I notice underneath my oil cap and in my larger rubber lines there seems to be this yellow goo, smells very strong of gas, it even swelled up the rubber line to the pcv valve and the line from the breather to the throttle body. I think I may have some issues with either the coolant temp sensor to the pcm, 02 sensors or injectors. what do you think !
03-05-2009, 10:11 AM
#11
I was thinking back to when this started and it seemed to start soon after I swapped injectors. I just put some new ones in and agian Ill have to see.how it goes. I also bought all new pig tail for every sensor on the damn motor.
I did notice one thing. Im only getting 10v to the iac motor.
I did notice one thing. Im only getting 10v to the iac motor.