Scan Tool Results-help needed with diagnosis
Thread Starter
Safety Car
Joined: Oct 2001
Posts: 4,763
Likes: 2
From: Connectivette
Scan Tool Results-help needed with diagnosis
Disclaimers............
-I do not have a heated O2 sensor
-Scan tool records for 30 seconds, actual WOT was for about 15 seconds.
Do you guys see any abnormalities.
TIA,
Chuck
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Scan Tool Results-help needed with diagnosis (chucks88)
The IAC count seems very high at idle. It should be around 20's. Turning the throttle stop screw should drop the count and maintian the idle. Your idle seems high too (1125). Do you have it programmed for that rpm?
Racer
Joined: Jul 2002
Posts: 401
Likes: 1
From: Aptos CA
Re: Scan Tool Results-help needed with diagnosis (Bluevette85)
The IAC count seems very high at idle. It should be around 20's. Turning the throttle stop screw should drop the count and maintian the idle. Your idle seems high too (1125). Do you have it programmed for that rpm?
chucks88: IM or e-mail me if you want me to double check this, otherwise I'll never remember. :crazy:
Drifting
Joined: Apr 1999
Posts: 1,261
Likes: 6
From: Middletown New Jersey
Re: Scan Tool Results-help needed with diagnosis (chucks88)
Which scan tool was this from? The MAF gr/sec are way off. Also, how were at WOT and you were at sucj a low RPM?
[Modified by GlennS87, 5:49 PM 5/31/2003]
[Modified by GlennS87, 5:49 PM 5/31/2003]
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Scan Tool Results-help needed with diagnosis (chucks88)
My car idles between 600-700. It jumped up to about 1000 when I plugged in the scan tool
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Team Owner
Joined: Dec 2000
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From: SE NY
Cruise-In II Veteran
Re: Scan Tool Results-help needed with diagnosis (chucks88)
Chuck here's what I see:
-it should not be closed loop at WOT
-the O2 sensor should swing to a higher voltage, i.e. over 900mV at WOT
-indeed the gm/sec MAF values should not be over 255
Note that on the rightmost BLM Enabled column it went from "yes" to "no". That indicates the ECM is now in open loop mode.
Are you sure you have the scanner setup correctly for your ECM.
-it should not be closed loop at WOT
-the O2 sensor should swing to a higher voltage, i.e. over 900mV at WOT
-indeed the gm/sec MAF values should not be over 255
Note that on the rightmost BLM Enabled column it went from "yes" to "no". That indicates the ECM is now in open loop mode.
Are you sure you have the scanner setup correctly for your ECM.
Thread Starter
Safety Car
Joined: Oct 2001
Posts: 4,763
Likes: 2
From: Connectivette
Re: Scan Tool Results-help needed with diagnosis (GlennS87)
Which scan tool was this from?
The MAF gr/sec are way off.
Also, how were at WOT and you were at such a low RPM?
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Team Owner
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From: SE NY
Cruise-In II Veteran
Re: Scan Tool Results-help needed with diagnosis (chucks88)
At a steady 2,200rpm my AutoXray shows 21gm/sec. The limit of the MAF is 255gm/sec.
Oh, also your TPS reading should be over 4Vdc at WOT.
How far from NY are you into CT?
Oh, also your TPS reading should be over 4Vdc at WOT.
How far from NY are you into CT?
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: Scan Tool Results-help needed with diagnosis (chucks88)
Sumpin not right with your scan tool.
RPMs are low for WOT
TPS low for WOT
Vehicle Speed Low For WOT (unless you were in neutral)
Hmm..., strange.
RPMs are low for WOT
TPS low for WOT
Vehicle Speed Low For WOT (unless you were in neutral)
Hmm..., strange.
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Re: Scan Tool Results-help needed with diagnosis (VetNutJim)
Wonder if the custom chip is doing something to the scantool.
The scantool is mine I let chuck borrow, and it works good when I use it.
Actually Chuck's BLM's are closer to perfect than mine.. :lol:
On my car they count from 0-255 and then reset and repeat again. :skep:
The scantool is mine I let chuck borrow, and it works good when I use it.
Actually Chuck's BLM's are closer to perfect than mine.. :lol:
On my car they count from 0-255 and then reset and repeat again. :skep:
Thread Starter
Safety Car
Joined: Oct 2001
Posts: 4,763
Likes: 2
From: Connectivette
Re: Scan Tool Results-help needed with diagnosis (65Z01)
Jim,
I can get to the Tapanzee in 1 1/2 hours.
Those TPS readings are not the same readings when I put a voltmeter to the
TPS sensor. So I don't know what's up there.
:eek: Those MAF readings are way out of whack
I can get to the Tapanzee in 1 1/2 hours.
Those TPS readings are not the same readings when I put a voltmeter to the
TPS sensor. So I don't know what's up there.
:eek: Those MAF readings are way out of whack
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Scan Tool Results-help needed with diagnosis (MrNuke)
MrNuke, if that scan tool is set up for your '85 it likely isn't right for Chuck's '88. When I transfer my AutoXray between the '86 IROC LB9 and the '88 Vette L98 I have to change configuration parameters, then all is well.
Chuck, if you would like to hook up to try my AutoXray we can arrange it, assuming we can ever get another day without rain.
Chuck, if you would like to hook up to try my AutoXray we can arrange it, assuming we can ever get another day without rain.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Scan Tool Results-help needed with diagnosis (65Z01)
Here are a few things I noticed, and I am the one that did the chip.
1. The BLMs are nearly dead on as I suspected they would be. So with that you are OK. And as Mr nuke said that is one of the hardest things to concour.
2. The IAC are way too high and need to be corrected by going through and resetting the min idle, shoot for between 20-35 at idle. This will limit the control the IAC has on the idle setting. Bet it swings now.
3. My guess it there should be a two place decimal like this in those MAF readings XX.XX that is why your seeing huge values, someone may have said that I did not read all the posts.
4. I have seen scanners not go to open when you envoke WOT, so that could be scanner dependant, and also some other items that are registering or should I say not registering could the result also. The chip would have nothing to do with the readings/scanner hickups, no more than a stock chip would.
5. I'm assuming that the RPMs for WOT where you were just at that RPM when the snapshot was taken....Correct?
Let me know if you want or get more information, as always I am available if you need me. :cheers:
1. The BLMs are nearly dead on as I suspected they would be. So with that you are OK. And as Mr nuke said that is one of the hardest things to concour.
2. The IAC are way too high and need to be corrected by going through and resetting the min idle, shoot for between 20-35 at idle. This will limit the control the IAC has on the idle setting. Bet it swings now.
3. My guess it there should be a two place decimal like this in those MAF readings XX.XX that is why your seeing huge values, someone may have said that I did not read all the posts.
4. I have seen scanners not go to open when you envoke WOT, so that could be scanner dependant, and also some other items that are registering or should I say not registering could the result also. The chip would have nothing to do with the readings/scanner hickups, no more than a stock chip would.
5. I'm assuming that the RPMs for WOT where you were just at that RPM when the snapshot was taken....Correct?
Let me know if you want or get more information, as always I am available if you need me. :cheers:
Racer
Joined: Jul 2002
Posts: 401
Likes: 1
From: Aptos CA
Re: Scan Tool Results-help needed with diagnosis (ski_dwn_it)
Here are a few things I noticed, and I am the one that did the chip.
I have seen scanners not go to open when you envoke WOT, so that could be scanner dependant.
I have seen scanners not go to open when you envoke WOT, so that could be scanner dependant.
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Re: Scan Tool Results-help needed with diagnosis (65Z01)
MrNuke, if that scan tool is set up for your '85 it likely isn't right for Chuck's '88. When I transfer my AutoXray between the '86 IROC LB9 and the '88 Vette L98 I have to change configuration parameters, then all is well.
Chuck, if you would like to hook up to try my AutoXray we can arrange it, assuming we can ever get another day without rain.
Chuck, if you would like to hook up to try my AutoXray we can arrange it, assuming we can ever get another day without rain.
