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02-19-2012, 03:18 PM
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#1
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Join Date: Dec 2008
Location: dorothy,NJ
Posts: 38
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any lt1 owners have/ had this prob?
Car at stop light rpms surge from 1000 to 1200 up and down than shoot up strong to about 2000 than smooths out and idles fine? Or sometimes stalls out but that's rare. Car jus had new opti, new tune, new o2's.
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93 z28 sold. 96 formula: custom tune, MSD, longtubes, performance pulleys, pacesetter Ory, Slp lm1,1.6 rockers, Moroso intake, Bmr/hotchkis/slp suspension, 4:10 gears, full built trans, Z06 rims.
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02-19-2012, 08:08 PM
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#2
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,370
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If you could read datastream, you should look at your IAC (idle air control motor) counts. You may want to take it off and clean it with carb cleaner along with the throttle body and passages. Carbon will ef with it. Just realizing now you said new tune. Do you mean someone tuned the PCM? That could obviously cause some issues if they didn't do it correctly.
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02-19-2012, 08:09 PM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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What brand opti and 02s?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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02-19-2012, 09:38 PM
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#4
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Join Date: Dec 2008
Location: dorothy,NJ
Posts: 38
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Not sure brand of opti but car was doin this before the tune, the opti, or the o2s.were changed.
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93 z28 sold. 96 formula: custom tune, MSD, longtubes, performance pulleys, pacesetter Ory, Slp lm1,1.6 rockers, Moroso intake, Bmr/hotchkis/slp suspension, 4:10 gears, full built trans, Z06 rims.
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02-19-2012, 10:07 PM
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#5
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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Quote:
Originally Posted by sweetbmxrider
If you could read datastream, you should look at your IAC (idle air control motor) counts. You may want to take it off and clean it with carb cleaner along with the throttle body and passages. Carbon will ef with it. Just realizing now you said new tune. Do you mean someone tuned the PCM? That could obviously cause some issues if they didn't do it correctly.
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i agree, i had a similar problem and it ended up being the IAC. also could this be happening due to a vacuum leak?
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02-20-2012, 09:35 AM
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#6
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Join Date: Dec 2008
Location: dorothy,NJ
Posts: 38
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Im gona try cleaning it and see what happens and I'm gona clean the MAF while I'm at it. I apreciate the ideas.
__________________
93 z28 sold. 96 formula: custom tune, MSD, longtubes, performance pulleys, pacesetter Ory, Slp lm1,1.6 rockers, Moroso intake, Bmr/hotchkis/slp suspension, 4:10 gears, full built trans, Z06 rims.
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02-20-2012, 09:37 AM
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#7
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by sjersey93z28
Im gona try cleaning it and see what happens and I'm gona clean the MAF while I'm at it. I apreciate the ideas.
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Good idea. As mentioned above, inspect your vacuum lines too. If they are still the original ones they could be cracked.
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02-20-2012, 09:43 AM
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#8
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Join Date: Dec 2008
Location: dorothy,NJ
Posts: 38
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Yea ill check them when I dig in and start cleaning everything. Also gona header wrap my headers to keep heat in the exhaust to try and see if the o2s will get more acurate readings.
__________________
93 z28 sold. 96 formula: custom tune, MSD, longtubes, performance pulleys, pacesetter Ory, Slp lm1,1.6 rockers, Moroso intake, Bmr/hotchkis/slp suspension, 4:10 gears, full built trans, Z06 rims.
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02-20-2012, 09:45 AM
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#9
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by sjersey93z28
Yea ill check them when I dig in and start cleaning everything. Also gona header wrap my headers to keep heat in the exhaust to try and see if the o2s will get more acurate readings.
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If you mean wrap the tubes with the heat wrap, don't bother. Will shorten the life of your headers and won't help the O2s at all.
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02-20-2012, 09:51 AM
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#10
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Join Date: Dec 2008
Location: dorothy,NJ
Posts: 38
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Ok was a thought. I'll start with the basics see wat happens.
__________________
93 z28 sold. 96 formula: custom tune, MSD, longtubes, performance pulleys, pacesetter Ory, Slp lm1,1.6 rockers, Moroso intake, Bmr/hotchkis/slp suspension, 4:10 gears, full built trans, Z06 rims.
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