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10-28-2006, 04:59 PM
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#1
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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Sputtering & back-firing
A new thing I have discovered with my car is it holds no power above 3k RPM's. It will buck & backfire, and not do anything. The problem is its inconsistant. The past few days, if I let the car warm up properly, its fine. But if its running cold, or too hot, it does this ****. And today it got to the point where the car doesn't even want to drive. It started constantly backfiring.
Its a MadZ28 tune for 91+ octane, and so far Ive only gone to one gas station for there Ultimate 93. Any suggestions?
Tommorow Im going to check and change my spark plugs & possibly even the wires. If it continues tommorow, are there any suggestions to what it could be? Bad mass air sensor? Poor tune?
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10-29-2006, 11:14 AM
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#2
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Any codes?
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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10-29-2006, 11:20 AM
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#3
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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hmmm, i dont wanna compare lol, but my buddy with a mustang had similar problems. his MAF was dirty. i cleaned it up with some q tips and alcohol. another friend with a mustang had TPS problems and that sounds like it could be it too, or maybe it jumped time? start with the basics tho, scan for codes and work from there!
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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
Last edited by 98tadriver; 10-29-2006 at 11:22 AM.
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10-29-2006, 11:23 AM
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#4
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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Well as far as a check engine light, then no.
I don't know how to read codes off the car.
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10-29-2006, 12:02 PM
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#5
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12 Second Club
Join Date: Sep 2004
Location: Vineland
Posts: 928
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Possible fuel delivery issue...maybe the pump is going? I suppose if the TPS had a dead spot or a two it could cause it...MAF could if its dirty like Ron said...
if youve got a schrader valve on the fuel rail (i dont know if LT1s do or not)...put a fuel pressure gauge on her while youre driving...and watch what happens when it starts to buck and what not.
And I don't know much about opti-spark either but couldn't that be a problem?
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87 iroc with the usual go fast stuff
heavier than your half ton.
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10-29-2006, 02:52 PM
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#6
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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I'll check everything you guys mentions, anyones guess is def better then mine 
The thing that bothers me is how its in-consistant.
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10-30-2006, 02:20 AM
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#7
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2007 Member of the Year
Join Date: Oct 2004
Location: Seabrook, TX
Posts: 14,281
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Opti?
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WF=DF
Kommandant of the ACL (Anti Canadian League)
Quote:
Originally Posted by LTb1ow
Junk the pos, spend the money on beer, acquire headache.
Same result cept this headache doesnt last months.
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10-30-2006, 11:46 AM
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#8
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11 Second Club
Join Date: Jan 2005
Location: Fishkill, NY
Posts: 1,278
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How new is the opti?
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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10-30-2006, 01:31 PM
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#9
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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its a brand new summit unit. Full system. I let the car warm up this morning for about 10 minutes, drove it and everything was fine.
Saturday was the worse it has ever been with back-firing.
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10-31-2006, 07:01 AM
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#10
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.
Join Date: Feb 2006
Posts: 1,385
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Fuel filter almost clogged - jz
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