got ahold of a tech2 for a few minuites... what might these values mean?
02-05-2003, 01:37 PM
#1
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Location: Milton, FL
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got ahold of a tech2 for a few minuites... what might these values mean?
i got ahold of a tech2 for a few minuites this morning and found (at idle)
spark advance jumping between 18 - 20 degrees
short term
bank1: 125
bank2: jumping between 122 - 124
long term
bank1: 121
bank2: 122
the o2 sensors were jumping a lot, just like normal
my problem is that it won't keep a smooth idle, it jumps about 50rpm's up and down, sometimes more. also, there is a slight miss below 2k rpm's. i've got new plugs, wires, opti, coil, fuel presure regulator... still have the problem.
i couldn't get any readings while the car was moving, they wouldnt' let me take the tech2 with me even driving in the parking lot.
i think my next step is to replace the fuel rail + injectors, if i can get them together, otherwise just the injectors.
any ideas why it'd jump around like that? the TPS seemed fine, no skips or jumps. there was no knock retard at all.
spark advance jumping between 18 - 20 degrees
short term
bank1: 125
bank2: jumping between 122 - 124
long term
bank1: 121
bank2: 122
the o2 sensors were jumping a lot, just like normal
my problem is that it won't keep a smooth idle, it jumps about 50rpm's up and down, sometimes more. also, there is a slight miss below 2k rpm's. i've got new plugs, wires, opti, coil, fuel presure regulator... still have the problem.
i couldn't get any readings while the car was moving, they wouldnt' let me take the tech2 with me even driving in the parking lot.
i think my next step is to replace the fuel rail + injectors, if i can get them together, otherwise just the injectors.
any ideas why it'd jump around like that? the TPS seemed fine, no skips or jumps. there was no knock retard at all.
02-05-2003, 03:06 PM
#4
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Join Date: Mar 1999
Location: Vancouver BC, Canada
Posts: 528
iroczsource.com, wrong info dude...
Its the other way around...
If your Long term BLM's are lower then 128, its a rich condition, and it'll cut fuel to get your Short Term fuel counts as close to 128 as possible.
anasazi, you can look into your Throttle Body for the slightly rough idle... Do a search and you'll see what i'm talking about.
Jeff
Its the other way around...
If your Long term BLM's are lower then 128, its a rich condition, and it'll cut fuel to get your Short Term fuel counts as close to 128 as possible.
anasazi, you can look into your Throttle Body for the slightly rough idle... Do a search and you'll see what i'm talking about.
Jeff
02-05-2003, 06:29 PM
#5
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Join Date: Jul 2001
Location: Milton, FL
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Originally posted by JeffK95Z
iroczsource.com, wrong info dude...
Its the other way around...
If your Long term BLM's are lower then 128, its a rich condition, and it'll cut fuel to get your Short Term fuel counts as close to 128 as possible.
anasazi, you can look into your Throttle Body for the slightly rough idle... Do a search and you'll see what i'm talking about.
Jeff
iroczsource.com, wrong info dude...
Its the other way around...
If your Long term BLM's are lower then 128, its a rich condition, and it'll cut fuel to get your Short Term fuel counts as close to 128 as possible.
anasazi, you can look into your Throttle Body for the slightly rough idle... Do a search and you'll see what i'm talking about.
Jeff
02-05-2003, 06:58 PM
#7
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Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,709
The small changes in timing are normal. It would have been nice if you had gotten the IAC steps (or counts). That would have told you how much air it is letting in at idle (or commanding to be let in).
02-05-2003, 07:22 PM
#8
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Join Date: Jul 2001
Location: Milton, FL
Posts: 3,604
Originally posted by shoebox
The small changes in timing are normal. It would have been nice if you had gotten the IAC steps (or counts). That would have told you how much air it is letting in at idle (or commanding to be let in).
The small changes in timing are normal. It would have been nice if you had gotten the IAC steps (or counts). That would have told you how much air it is letting in at idle (or commanding to be let in).
or 40... it was a multiple of 20 though
... pretty sure it was 20.
02-05-2003, 08:15 PM
#9
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Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,709
20, 40...actually anything around there could be normal depending on your engine mods. More toward the lower number if stock. The lower the number, the less air is being added at idle. Way low or way high would have been a red flag.
02-05-2003, 08:22 PM
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Join Date: Jan 2003
Posts: 161
You can buy one but they are about $2500. Does your engine stumble when the oil filler cap is removed? Could be an internal intake gasket leak, early LT1's are known for this. I didn't catch your year. Another symptom of this is excessive oil consumption. Good luck.
02-05-2003, 09:13 PM
#12
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Join Date: Jul 2001
Location: Milton, FL
Posts: 3,604
Originally posted by kjlvilla
You can buy one but they are about $2500. Does your engine stumble when the oil filler cap is removed? Could be an internal intake gasket leak, early LT1's are known for this. I didn't catch your year. Another symptom of this is excessive oil consumption. Good luck.
You can buy one but they are about $2500. Does your engine stumble when the oil filler cap is removed? Could be an internal intake gasket leak, early LT1's are known for this. I didn't catch your year. Another symptom of this is excessive oil consumption. Good luck.
the Tech2 is a neat little device, costs about 2500, and i think can only be baught by mechanics. i've even looked on egay and couldn't find them, or tech1's. the local community college has 9 of them, and they don't seem to know how to use them, hence it wasn't much help this morning
02-05-2003, 09:43 PM
#13
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From my as yet unpublished writeup on the available scanners.....
OTC Tech-series:
Tech 2 Flash GM Dealership Scan Tool OTC ($3,000)
http://www.aeswave.com/framedcatalog...Tech2Flash.htm
OTC Tech-series:
Tech 2 Flash GM Dealership Scan Tool OTC ($3,000)
http://www.aeswave.com/framedcatalog...Tech2Flash.htm
Last edited by Injuneer; 02-05-2003 at 09:47 PM.
02-05-2003, 10:39 PM
#14
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Originally posted by Injuneer
From my as yet unpublished writeup on the available scanners.....
OTC Tech-series:
Tech 2 Flash GM Dealership Scan Tool OTC ($3,000)
http://www.aeswave.com/framedcatalog...Tech2Flash.htm
From my as yet unpublished writeup on the available scanners.....
OTC Tech-series:
Tech 2 Flash GM Dealership Scan Tool OTC ($3,000)
http://www.aeswave.com/framedcatalog...Tech2Flash.htm
mmmm thats lots of cash
are you going to put that writeup online somewhere? i'd like to read it
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