1G high boost car stuttering.

[a91eagletalon]

ok so I installed new injectors because two were bad and is after a motor reinstall. So this is basically the first few times it has been driven after I reinstalled to motor any ways car runs great otherwise but when I get to full boost its almost like it just stutters for a split sec and then stops and dose it again until I let off. but if I bring up the boost slow it will not do it until I am at wot. When I am making a pull the wideband says 12.5 to 12 and drops to 11.5 a bit. do you think that I am washing out my plugs because it is running a bit rich under wot. If I just rail on it in first gear it dose not do much but shutter and cough a bit but if I bring it up slow I wont do it till im in high boost.
I installed new plugs gaped them to .028.
so any clues.


THANKS
MJP

 

[Gerkdogg]

ok so I installed new injectors because two were bad and is after a motor reinstall. So this is basically the first few times it has been driven after I reinstalled to motor any ways car runs great otherwise but when I get to full boost its almost like it just stutters for a split sec and then stops and dose it again until I let off. but if I bring up the boost slow it will not do it until I am at wot. When I am making a pull the wideband says 12.5 to 12 and drops to 11.5 a bit. do you think that I am washing out my plugs because it is running a bit rich under wot. If I just rail on it in first gear it dose not do much but shutter and cough a bit but if I bring it up slow I wont do it till im in high boost.
I installed new plugs gaped them to .028.
so any clues.


THANKS
MJP

 

[Gerkdogg]

Try your plug gap down to .018 and see if that helps. I've had that same problem caused by spark play blow out..

 

[Marchev]

What fuel are you using? If you're running 93 oct at ~12.0 afr you're running lean, not rich and that would explain your sputtering. Can you post a log so we can see what's happening?
+1 on too wide of a gap as well

 

[SonySlave]

I agree with Gerk, gap your plugs down to .018-.020 and see if that helps. I'll bet it does. No reason at all to be gapped more than that. Your profile says you're running E85 so your AFR sounds fine. 11.5 isn't too rich. E85 demands a very tight plug gap though, so try that.

 

[a91eagletalon]

Thanks for the help guys I will bring the plug gap down tonight and see how that work and get back tomorrow with my results.

 

[a91eagletalon]

That solved the problem 100% I thought the plugs needed less gap but had know idea how much. so know I know. thanks for the help its much appreciated

 

[Jerzm3]

Glad you got everything sorted out!! I will keep that bit of info in my tool box in case I run into a similar situation.