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View Full Version : Stuttering at full throttle around 15psi....no CEL



burner799
06-21-2009, 08:40 PM
Recently my car has stuttered around 15psi at full throttle. It feels like a boost leak but it eventually breaks through it and hits 18psi. I'm nbw chipped and when I pin it in any gear, right around 15psi this happens.

What blocks should I log or what could this be? n75?

99blueb5
06-21-2009, 08:41 PM
what kind of DV are you running?

burner799
06-21-2009, 09:00 PM
710n

burner799
06-21-2009, 11:10 PM
nobody huh? ......why do the car audio and other stupid shit threads get tons of responses...

99blueb5
06-22-2009, 01:26 AM
i would check for some sort of boost leak, or check out your n75

J Ozzie
06-22-2009, 01:51 AM
Chill dude let the posts be seen first.

burner799
06-22-2009, 01:57 AM
^thanks for your tremendous technical knowledge.

99blueb5, I appreciate the help, I have been throwing a code for n75, but this is the first possible side effect. I'll order a new one and see if it fixes things.

J Ozzie
06-22-2009, 02:35 AM
You obv have a boost leak somewhere.. get your hands dirty and start playing with shit and looking around for split hoses! do the n75valve test...with the car running un plug the cable from the n75 and then put it back in...you should hear a faint click.. if it works then your n75 is good to go.. but since your getting a code for it im guessin its shot!

danphines
06-22-2009, 07:55 AM
check to see it the gap on your spark plugs is too big

bassed
06-22-2009, 07:57 AM
Plugs and Coil Packs. Stuttering is usually spark related if no CEL IME.

DamagedGoods
06-22-2009, 07:58 AM
I had a similar issue with my coilpacks, repalced coilpacks and the issue went away.

onemoremile
06-22-2009, 08:22 AM
I had the same problem and it was pcv related.

gli_ryan
06-22-2009, 08:30 AM
sparks plugs. they are dirty or your gap is too big. I've gone through that twice now. happens right at 15psi every time with chronic misfiring.

burner799
06-22-2009, 02:34 PM
I'll throw in some plugs and gap them to .028
we'll see if it does anything

getslideways
06-22-2009, 02:57 PM
what was the n75 code that you pulled up? and was that the only one?

burner799
06-22-2009, 09:21 PM
So I threw in some new NGK gapped at .028 and all is well.
Old Bosch seem to be at around .035 or worse so I guess this was the problem.

Question though, I am on a 1 bar apr chip and my boost gauge is showing about 15 psi at wot. I was seeing 18+ psi before.

My boost gauge line is going to the line that is on the top side of the engine, could this be affecting the reading? I was recently told that the line should be going to the return on the low side of the intake mani (facing the engine) that comes up from the DV....car seems to pull just as hard as ever though.....

m6amba
06-22-2009, 10:44 PM
i had the same problem, went with autolite single electrode plugs gapped to .026"
and replaced 710n with evoms.....worked for me

m6amba
06-22-2009, 10:45 PM
btw, my boost gauge is hooked up to the line running to the FPR....and i hold steady at 15-16 psi......

burner799
06-23-2009, 03:00 AM
the diverter valve shouldn't have anything to do with this

As far as holding steady at 15, that is about right as our chips are 1 bar (14.5 psi), but I have a feeling we would be showing higher numbers by rigging our boost gauge diffierently....or so i hear