This Things Pissin Me Off!!!!
This Things Pissin Me Off!!!! ya like the subject says... ive been fighting this damn thing for the last 3 weeks!!!
Start it when the motor is cold and it feels as if it has a totally dead cylinder. drive it and it feels the same way. As the engine warms up you can put it under a load/bring it into boost and the miss will either do 1 of 2 things...
1. clear up and run perfect until there is no load then go back to missing
2. pop through the exhaust as if the spark is being blown out
i have changed the plugs twice and none show any signs of abnormal burn. When the motr pick up that cylinder its plain as day... its like someone just turned it on. I am dumbfounded on this PLEASE HELP!!!
Blake
Start it when the motor is cold and it feels as if it has a totally dead cylinder. drive it and it feels the same way. As the engine warms up you can put it under a load/bring it into boost and the miss will either do 1 of 2 things...
1. clear up and run perfect until there is no load then go back to missing
2. pop through the exhaust as if the spark is being blown out
i have changed the plugs twice and none show any signs of abnormal burn. When the motr pick up that cylinder its plain as day... its like someone just turned it on. I am dumbfounded on this PLEASE HELP!!!
Blake
Registered User
Joined: Jun 2002
Posts: 453
Likes: 0
From: Forced Induction Heaven
Originally Posted by 417 Motorsports
ya like the subject says... ive been fighting this damn thing for the last 3 weeks!!!
Start it when the motor is cold and it feels as if it has a totally dead cylinder. drive it and it feels the same way. As the engine warms up you can put it under a load/bring it into boost and the miss will either do 1 of 2 things...
1. clear up and run perfect until there is no load then go back to missing
2. pop through the exhaust as if the spark is being blown out
i have changed the plugs twice and none show any signs of abnormal burn. When the motr pick up that cylinder its plain as day... its like someone just turned it on. I am dumbfounded on this PLEASE HELP!!!
Blake
Start it when the motor is cold and it feels as if it has a totally dead cylinder. drive it and it feels the same way. As the engine warms up you can put it under a load/bring it into boost and the miss will either do 1 of 2 things...
1. clear up and run perfect until there is no load then go back to missing
2. pop through the exhaust as if the spark is being blown out
i have changed the plugs twice and none show any signs of abnormal burn. When the motr pick up that cylinder its plain as day... its like someone just turned it on. I am dumbfounded on this PLEASE HELP!!!
Blake
Put a timing light on your plug wires next to the coil. You can see if one of the coils is missing.
You can also put a Tech II on the car and drive it around and see what bank is misfiring. This will help you isolate where the problem is occurrying at.
00 s-10 blazer
6.0 swap stock internals
painless harness
SP76 GTQ/HO turbo
A2A FMIC 3" piping
SVO 42lb/hr injectors
th350 trans w/ 2800 convertor
innovative wideband
98 camaro PCM
this setup has been runnin great for 4 months now. It all started when i put racegas in it one friday night.... i have had a good a/f ratio 14.5ish cruising and 10.8 wide open... i have only been ruinnin 4 lbs of boost and all the sudden it started missin
the truck has gone 12.43@109 on street tires and 4 lbs of boost, as for dyno #s? who knows never been just has a street tune
6.0 swap stock internals
painless harness
SP76 GTQ/HO turbo
A2A FMIC 3" piping
SVO 42lb/hr injectors
th350 trans w/ 2800 convertor
innovative wideband
98 camaro PCM
this setup has been runnin great for 4 months now. It all started when i put racegas in it one friday night.... i have had a good a/f ratio 14.5ish cruising and 10.8 wide open... i have only been ruinnin 4 lbs of boost and all the sudden it started missin
the truck has gone 12.43@109 on street tires and 4 lbs of boost, as for dyno #s? who knows never been just has a street tune
TECH Resident
Joined: Jan 2002
Posts: 956
Likes: 0
From: Phoenix, AZ
Our problems sound similar . . . mine came out of nowhere, I didn't even put race gas in. I have checked/changed my plugs, have not checked the coils or wires yet. Mine stumbles all the time when under 1800rpm, goes away under normal driving but shows up again when laying into it. Like it's missing. Stumbles real bad if I drive slow down the street in 3rd gear around 1200rpm and brake on it, it's bucking like a horse.
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I would say Oxygen Sensors as well. Do you have some type of tuning interface where you can give some readings? Normally with Race gas, I recommend Denso O2's.
Also, check the simple stuff first - fuel pressure, fuel filter, etc.
Also, check the simple stuff first - fuel pressure, fuel filter, etc.
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Originally Posted by Assassin
did you pull all the plug wires and inspect them?
yeah, when you put a load, you put more juice also, so it might be skipping past the bad part of the wire... also I had something similar happen on another vehicle and it ended up being a broken plug but didnt notice till 3 times pulling off the plug wires, so check those too..
sounds like plugs or wires. I've chase this same demon myself. turned out to be a cracked plug.
If you want to run leaded gas replace your o2's with denso's. I run lots of leaded and they lasted me 8 months before getting a little sluggish.
If you want to run leaded gas replace your o2's with denso's. I run lots of leaded and they lasted me 8 months before getting a little sluggish.
So do you show misfires on all cylinders or just one at idle?
My checklist would be:
-plugs (easy)
-install TR6 @ .030
-wires (easy, put stock on to check)
-check base and wot fuel pressure (57 base, more than a 10psi drop at wot is bad)
-a/f tune? lean at idle, and stock thru part cruise, and then wot should be like 12:1 or fatter
I'm thinking you are rich down low, and the spark plugs are loading up.
My checklist would be:
-plugs (easy)
-install TR6 @ .030
-wires (easy, put stock on to check)
-check base and wot fuel pressure (57 base, more than a 10psi drop at wot is bad)
-a/f tune? lean at idle, and stock thru part cruise, and then wot should be like 12:1 or fatter
I'm thinking you are rich down low, and the spark plugs are loading up.
wide band is on it, down low is 14s so is cruising and part throttle and WOT is high10s
plugs have been changes 2 times now with no effect...
i am NOT throwing any missfire codes anytime.... and it seems as if after i rip it a few times back to back it clears up and runs fine! liek if say the egts get over 1000'F (probes in DP)
plugs have been changes 2 times now with no effect...
i am NOT throwing any missfire codes anytime.... and it seems as if after i rip it a few times back to back it clears up and runs fine! liek if say the egts get over 1000'F (probes in DP)