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12-12-2008, 10:49 PM
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#1
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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LS1 not running need help
Ok i need help in a big way. My car seems to run fine and then it feels like a few cylanders die and it richens itself out. then itll idle like its got a monster cam in it and stalls. when it stalls it shoots fire out the exhaust and makes a huge backfire that sounds just like a gun shot. then ill let it sit and itll start up after it cools down a bit. sometimes itll just fix itself. wich is why i beleive it is a sensor of some sort. it also happens worse in the cold and rain. If i give it gas itll sputter backfire and stall. Please help here are the mods list
Ls1 with 90k on it
Stock 4l60e
Stock Gears
Flowtech Longtubes with catless flowtech y pipe.
Flowmaster Cat back
The 02 sensors are the stock ones out my stock manifolds and are delcos
I have a LS6 manifold
Im running TR6 plugs because im planning on spraying it down the road
Ported throtle body
MSD wires
Timing is at 26 degress total
Any advice is greatly apreciated
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 10:52 PM
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#2
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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Check your 02 sensors... make sure the wires are not burned agenst the headers.
Also, try and unplug the MAF to see if it worsens...
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
Last edited by NJ Torque; 12-12-2008 at 10:53 PM.
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12-12-2008, 11:00 PM
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#3
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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yeah ill give that a shot i replaced them though nothing seems burnt any other theories?
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 11:24 PM
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#4
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Join Date: Dec 2008
Location: Garwood NJ
Posts: 221
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Would be a lot easier with some scan tool data. Even with no codes, could be an in range failure of a sensor. For a wild guess, I say coolant temp sensor not reading proper temperature at all times due to faulty sensor or wiring, and providing cold start enrichment to a warmed up engine.
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Artie
73 Camaro 25.3 build TT LS in progress
67 Camaro
99 T/A
Other crap not worth mentioning
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12-12-2008, 11:26 PM
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#5
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Stalker
Join Date: Aug 2004
Posts: 12,080
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*shivers* im having flashbacks of my catastrophic engine failure....
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12-12-2008, 11:29 PM
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#6
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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great....lol
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 11:30 PM
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#7
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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oh and i already replaced my coolan sensor when it died on my at the track this summer also when the car acts that bad i have no tach reading
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 11:31 PM
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#8
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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check engine light on? is it throwing any codes? check your EVAP lines under the hood. it plugs into the driver side of the intake. if any of that is loose, it will idle like it has a cam and run crappy after a while.
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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12-12-2008, 11:31 PM
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#9
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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the code i pulled was 02 sensor heater circuit not working thats another thing i found out in my diagnostics ill have a scanner on her tomorow night for more data loging
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 11:35 PM
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#10
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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good stuff. youre off to a good start. scanners for the win!
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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12-12-2008, 11:37 PM
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#11
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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yeah hopefully itll be ok nothing serious its gotta be a sensor of some sort i hope because like i said itll magically fix itself sometimes
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-12-2008, 11:52 PM
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#12
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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anyone else have any ideas?
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 12:00 AM
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#13
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Stalker
Join Date: Aug 2004
Posts: 12,080
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does it get better or worse weather dependent, like rain/water?
at one point i had the JET plug in module for the ECM... it moved the connector out far enough that the wires rubbed on the hood hinge, wore through and when they got wet... my car went insane. TCS on and off, abs, misfires etc
Last edited by V; 12-13-2008 at 12:01 AM.
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12-13-2008, 12:02 AM
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#14
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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it does it really bad in the rain and the cold
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 12:08 AM
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#15
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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cant figure out why the tach becomes inop during the misfires either...
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 12:22 AM
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#16
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Stalker
Join Date: Aug 2004
Posts: 12,080
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ill post more ideas/things to check tomorrow, right now im tired and a lotta stuff going on here, roommate going to afghanistan tomorrow. and in my engine failure, diesel fuel in my gas was the cause, so dont worry.
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12-13-2008, 12:28 AM
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#17
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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alright thanks bro i feel better about the engine failure now lol talk to you tomorow night when i get the scanner on her ill post the data log info
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 01:05 AM
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#18
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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jus throwing the idea out there crank position sensor would throw a p0300 code if it senses a misfire now if that sensor is not reading correctly wouldnt it make the car run horrible and backfire?
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 02:35 AM
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#19
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10 Second Club
Join Date: Aug 2004
Location: Eastampton
Posts: 4,466
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Check the plugs. I had a prob like that recently with my vette. Check the grounds on the PCM and also check the fuel pump/filter.
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1999 MBM T/A - the new ride 
2004 CE Corvette - 1.410 - 10.246 @ 133.39
2003 Silverado - Lifted 6 on 35s
2000 T/A WS6 - 11.190 @ 119.79...SOLD
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12-13-2008, 03:06 AM
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#20
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Join Date: Apr 2008
Location: Delran
Posts: 6,785
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when your car misfires it dumps fuel out the valves that didnt get burned and it burns up in the exhaust and backfires.
id check everything along the lines of the PIP (proper ignition pickup) which would mean everything in the ignition system....from the coils to the cam sensor to the crank sensor and back again.
sounds like you need a DVOM and start testing voltages and resistances of your sensors...unless you like throwing parts at a motor
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12-13-2008, 06:51 AM
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#21
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Join Date: May 2007
Location: Cherry Hill, NJ
Posts: 150
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sounds like a Crank Position Sensor. Def check the PCM and the Fuel Pump. Just take the pressure line off the fuel rail and put the hose in a cup and turn the key to run, DO NOT START. Just to see if your getting any fuel!
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12-13-2008, 01:42 PM
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#22
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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im leaning in the direction of the crank sensor due to loss of tach ill keep you all posted goin to work on it right now
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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12-13-2008, 02:43 PM
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#23
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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well does that tac completely drop off? or does it drop down because your idle went to crap? also, you said you had an 02 code. did you fix this?
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12-13-2008, 03:53 PM
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#24
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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you probably just need to change the opti...........................
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So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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12-13-2008, 04:17 PM
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#25
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Join Date: Aug 2008
Location: Manahawkin
Posts: 83
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my cars coil on plug....its an ls1...and the tach shuts completely off when the car misfires
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99 Z28 Boltons 2 stages 88 Camaro 350 TBI swap
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