 |
04-13-2009, 12:19 PM
|
#1
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
LSX Gurus Enter!
Alright to start I have a 2001 trans am mostly stock. I am having a problem with the car breaking up in third and fourth and I get a random cylinder misfire codegear under aggressive throttle . the problem comes and goes so I never seem to be logging when it acts up. plugs look good but ill be changing them anyway...fuel filter was replaced not to long ago and the pump was good last time I had the gauge on the fuel rail. any input would be great...
-Dave
Last edited by Zero4488; 04-13-2009 at 01:04 PM.
|
|
|
|
04-13-2009, 12:55 PM
|
#2
|
|
10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
|
Do you have a braking problem, or is the car only misfiring in third and fourth? If it is a braking problem, is it related to the random misfire or are these two different problems?
List of mods that you have done would help, mostly stock is vague.
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
|
|
|
|
|
04-13-2009, 01:05 PM
|
#3
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by KirkEvil
Do you have a braking problem, or is the car only misfiring in third and fourth? If it is a braking problem, is it related to the random misfire or are these two different problems?
List of mods that you have done would help, mostly stock is vague.
|
I meant breaking up...sorry the OP was from my cell phone....but the car breaks up from time to time in third and fourth....and only third and fourth....
|
|
|
|
|
04-13-2009, 01:21 PM
|
#4
|
|
10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
|
It may be a coil starting to go bad. I take it you've checked all the wires when you did plugs? Are you running the stock tune?
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
|
|
|
|
|
04-13-2009, 01:40 PM
|
#5
|
|
11 Second Club
Join Date: Aug 2008
Location: Hagerstown, MD
Posts: 1,566
|
those msd coils are not exactly perfect.
__________________
J E R S E Y S H O R E O W N S Y O U
12 Sonic Turbo
07 Malibu SS
04 Silverado SS - Sold 
00 Trans Am WS6 - Sold
-.:: United States Marine Corps ::.-
|
|
|
|
|
04-13-2009, 02:12 PM
|
#6
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by KirkEvil
It may be a coil starting to go bad. I take it you've checked all the wires when you did plugs? Are you running the stock tune?
|
How would I be able to narrow it down to one specific coil? The MSD's aren't exactly what I would call cheap. The wires are in good shape, and the tune is spot on....
Quote:
Originally Posted by DevilDougWS6
those msd coils are not exactly perfect.
|
Ok...lets hear it...whats wrong with my coils?
|
|
|
|
|
04-13-2009, 02:30 PM
|
#7
|
|
10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
|
Quote:
Originally Posted by Zero4488
How would I be able to narrow it down to one specific coil? The MSD's aren't exactly what I would call cheap. The wires are in good shape, and the tune is spot on....
|
The misfire and breaking up in specific gear leads me to believe that tuning and ignition would be the issue. Any aftermarket part and tuning will add complication to the car. Why did you swap to msd coils?
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
|
|
|
|
|
04-13-2009, 03:02 PM
|
#8
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by KirkEvil
The misfire and breaking up in specific gear leads me to believe that tuning and ignition would be the issue. Any aftermarket part and tuning will add complication to the car. Why did you swap to msd coils?
|
Had an extra set laying around and threw em on my car....they have been on my car for well over a year...
|
|
|
|
|
04-13-2009, 03:08 PM
|
#9
|
|
Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
|
Quote:
Originally Posted by KirkEvil
It may be a coil starting to go bad. I take it you've checked all the wires when you did plugs? Are you running the stock tune?
|
If it ever throws a code for a particular cylinder then swap that cyl's coil with another and see if the code moves with it.
For what it's worth I had a set of Accel DIS coils on my GTP that lasted a grand total of 127 miles before they started to misfire. Put the stockers back on and never looked back.
Last edited by WildBillyT; 04-13-2009 at 03:10 PM.
|
|
|
|
|
04-13-2009, 03:21 PM
|
#10
|
|
11 Second Club
Join Date: Aug 2008
Location: Hagerstown, MD
Posts: 1,566
|
ive always seen msd packs ***** up for no reason. they are a waste of money IMO
__________________
J E R S E Y S H O R E O W N S Y O U
12 Sonic Turbo
07 Malibu SS
04 Silverado SS - Sold
00 Trans Am WS6 - Sold
-.:: United States Marine Corps ::.-
|
|
|
|
|
04-13-2009, 03:31 PM
|
#11
|
|
Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
|
what is the engine speed and vehicle speed when it throws the random misfire? what code #'s in particular are you seeing?
|
|
|
|
|
04-13-2009, 04:05 PM
|
#12
|
|
BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
|
i used to run the msd coils, and while i never had a problem with them, i also never had any gains with them.
i would try and swap on the stocker coils and see if that fixes the problem, and while your at it check all the plugs and wires for any defects
__________________
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.
|
Mercerville MotorSports, LLC
|
|
|
|
|
04-13-2009, 04:35 PM
|
#13
|
|
12 Second Club
Join Date: Nov 2004
Location: Haddon Twp NJ
Posts: 2,213
|
after talking to one of my automotive teachers could be a crank sensor hanging up or reading wrong. he thought that may be whats wrong with my car
Last edited by 69BirdX; 04-14-2009 at 06:44 AM.
|
|
|
|
|
04-13-2009, 05:46 PM
|
#14
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by WildBillyT
If it ever throws a code for a particular cylinder then swap that cyl's coil with another and see if the code moves with it.
For what it's worth I had a set of Accel DIS coils on my GTP that lasted a grand total of 127 miles before they started to misfire. Put the stockers back on and never looked back.
|
I've been hoping for it to throw a specific cylinder misfire...but I'm only getting a random....
Quote:
Originally Posted by DevilDougWS6
ive always seen msd packs ***** up for no reason. they are a waste of money IMO
|
Personally I've never heard of a problem with the coil packs at all...
Quote:
Originally Posted by sweetbmxrider
what is the engine speed and vehicle speed when it throws the random misfire? what code #'s in particular are you seeing?
|
It's happening between 4k and 6200 in third and fourth gear....as for the exact code number...I'll pull it later...all I remember is random cylinder misfire...
Quote:
Originally Posted by 69BirdX
after talking to one of my automotive teachers could be a crack sensor hanging up or reading wrong. he thought that may be whats wrong with my car
|
What sensor or sensors was he thinking?
Thanks for all the input everyone....keep the good ideas coming...
|
|
|
|
|
04-13-2009, 05:52 PM
|
#15
|
|
10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
|
hmmm, maybe a broken/damged valvespring? get somebody who knows hptuners to hook it up to your car and they could see exactly what cyliner is misfiring
__________________
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
|
|
|
|
|
04-13-2009, 06:12 PM
|
#16
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by 98tadriver
hmmm, maybe a broken/damged valvespring? get somebody who knows hptuners to hook it up to your car and they could see exactly what cyliner is misfiring
|
I would think if it were the valve spring it would happen everytime and in every gear....I haven't had my HPT hooked up to the car recently...gotta get some logs...I'm gunna lean towards the plugs and wires....
|
|
|
|
|
04-13-2009, 06:48 PM
|
#17
|
Join Date: Feb 2005
Location: Orange County NY
Posts: 579
|
Loose the MSD coil packs they suck... I know a few people that had them and there nothing but problems
__________________
2000 Camaro 25.5 Turbo car  X275
|
|
|
|
|
04-13-2009, 10:38 PM
|
#18
|
|
11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
|
^yup... they are expensive and dont do anything for you...
__________________
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
|
|
|
|
|
04-13-2009, 11:18 PM
|
#19
|
|
NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
|
Do you have or have access to HPTuners or some similar data logging software? If it isn't throwing a code, maybe you can at least see what is going on by looking through histograms
|
|
|
|
|
04-13-2009, 11:40 PM
|
#20
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by NJSPEEDER
Do you have or have access to HPTuners or some similar data logging software? If it isn't throwing a code, maybe you can at least see what is going on by looking through histograms
|
Haven't had a chance to log it yet....
|
|
|
|
|
04-14-2009, 12:33 AM
|
#21
|
|
10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
|
yeah if u can, thatd be the best thing to do. it will show what cylinder is misfiring because theres a thing monitors them and counts the misfires
__________________
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
|
|
|
|
|
04-14-2009, 06:44 AM
|
#22
|
|
12 Second Club
Join Date: Nov 2004
Location: Haddon Twp NJ
Posts: 2,213
|
crank sensor my bad
|
|
|
|
|
04-14-2009, 12:55 PM
|
#23
|
|
Banned
Join Date: Apr 2006
Location: Port Reading
Posts: 252
|
Quote:
Originally Posted by 69BirdX
crank sensor my bad
|
Oh...it's not the crank sensor....I already had the expirience of diagnosing a bad one....
|
|
|
|
|
04-14-2009, 03:18 PM
|
#24
|
|
Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
|
Lose the MSD coils, I had a set and they gave me problems too. MSD makes good stuff for lots of applications, but the LS coils are junk. And they're expensive junk. Can you see if any of the coils(the plastic case) are starting to separate? That is usually what happens. I wouldn't troubleshoot too much farther until you swap them out first.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
Last edited by JL8Jeff; 04-14-2009 at 03:24 PM.
|
|
|
|
04-14-2009, 04:08 PM
|
#25
|
|
Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
|
i would also look for carbon tracing and very light corrosion on the coils.
|
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
|
