#1 permalink
SRTforums Member
Join Date: Aug 2006
Member Number: 44525
Location: NoVA
Posts: 22
SRT4 Breaking up at 4500RPM under boost.
Car use to run solid as hell, now this issue came up. Under WOT, after boost comes in, around 4500rpm the car just starts breaking up/popping/back fireing, I thought maybe the plug's were fouled so replaced them. Same issue continued. Checked for vac leaks, cant find any. Any suggestion's? Car was on 19psi and now we have it turned down to 15psi and still is breaking up.
Last edited by Jason300zxTT : 06-30-2008 at 10:44 AM .
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#2 permalink
Premium Member
Join Date: Feb 2007
Member Number: 50755
Location: Goodyear
Posts: 429
when you replaced the plugs did you notice if the wires in good shape? bad wires and bad connections can cause that too. make sure you use di electric grease any time you change wires or plugs.
#3 permalink
SRTforums Member
Join Date: Aug 2006
Member Number: 44525
Location: NoVA
Posts: 22
Yup, plugs/wires are new and are done correct. Any idea's?
#4 permalink
SRT-4 Discussion Moderator
Join Date: Feb 2005
Member Number: 24437
Location: Worcester, MA
Posts: 3,102
coil?
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#5 permalink
SRTforums Member
Join Date: Apr 2008
Member Number: 63229
Location: detroit
Posts: 186
i have to use di electric grease once a week on the plugs and wires.. wtf is up with that?
#6 permalink
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Join Date: Jun 2003
Member Number: 1784
Posts: 1,211
what are the plugs gapped at?
#7 permalink
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Join Date: Jun 2008
Member Number: 65068
Location: michigan
Posts: 7
mine is doing the same thing but at 7psi. i have granatelli wires on the way and just changed plugs. keeping fingers crossed
#8 permalink
SRTforums Member
Join Date: Dec 2005
Member Number: 36179
Location: Washington
Posts: 606
Yeah check the coil and wires. And if you are running an MSD coil trash it and get a stock one.
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#9 permalink
SRTforums Member
Join Date: Apr 2008
Member Number: 63229
Location: detroit
Posts: 186
im gapped at .038 holding 17psi fade to 15psi
#10 permalink
SRTforums Member
Join Date: Mar 2007
Member Number: 52533
Location: pittsburgh
Posts: 110
mine is doing the SAME thing!! WTF! i thought it was plugs and wires 2, i havent got to get new ones yet, so i figured id look around here to see if any1 else was having the same problem...
#11 permalink
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Join Date: Jun 2007
Member Number: 54645
Location: Weston
Posts: 999
1.) Replace upstream o2 sensor
#12 permalink
SRTforums Member
Join Date: Jun 2008
Member Number: 65076
Location: Loves Park, Il
Posts: 79
Quote: Originally Posted by
SRTMIAMI 1.) Replace upstream o2 sensor
I'm curiuos wouldn't the pcm throw a code on a bad o2 sensor?
#13 permalink
SRTforums Member
Join Date: Jun 2008
Member Number: 65221
Location: Elk Grove, Ca
Posts: 14
ehhh....depends. not always tho. my SRT4 does the same thing too
#14 permalink
SRTforums Member
Join Date: Aug 2006
Member Number: 44525
Location: NoVA
Posts: 22
Quote: Originally Posted by
buzzfast ehhh....depends. not always tho. my SRT4 does the same thing too
OK UPDATE.
Car has brand new
plugs
wires
coil
turbo/wg/bov is all good no leaking.
vac is good
boost is turned down to 14psi and not 19psi
reset the ecu
Use to have MSD coil, but replaced it to oem
Stage 3 ecu
Still has same problem. 4500 still break's up.
#15 permalink
SRTforums Member
Join Date: Mar 2004
Member Number: 8706
Location: Long Island
Posts: 5,442
Why are you running a Stage 3 PCM?
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SRT4 Breaking up at 4500RPM under boost.
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Fro G's garage. When you want to be fast in the PNW 
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