Ongoing saga
Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Ok, found out a couple of things.
1) for some reason the spark plug socket is binding in 2 cylinders, 4 @ 8
Had to use a different socket to tighten completely, funny that the socket worked on all the others.
2) I pinched a plug wire on the drivers side putting the WP back on, car is running better. But, is not running great, I can still hear a miss on the drivers side, pass. side sounds good.
Funny thing about the 2 loose plugs, I couldn't tell 8 was loose, but 4 vibrated all over the place and the car ran real good at times.
1) for some reason the spark plug socket is binding in 2 cylinders, 4 @ 8
Had to use a different socket to tighten completely, funny that the socket worked on all the others.
2) I pinched a plug wire on the drivers side putting the WP back on, car is running better. But, is not running great, I can still hear a miss on the drivers side, pass. side sounds good.
Funny thing about the 2 loose plugs, I couldn't tell 8 was loose, but 4 vibrated all over the place and the car ran real good at times.
I noticed on one cylinder I have to take the screw on tip of the plug to get my socket in there, and I use a socket for the plugs and a 3/4 wrench as the ratchet doesnt fit. On #4, I tighten it then put on the little tip and put the plug wire on. All headers are different fitment. But a retune for Long Tubes is necessary over shortys!!!
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Car is running much better, but it still has issues. One is really driving me to drink(more).
I put the car on Datamaster, well after playing around for 10 minutes(another story) and the IAC is way off again.
Here is what Datamaster said:
IDLE 725 Spark Adv 23.00
Fuel trim 16 Map Hg 10.58
LTerm 138 132
STerm 121 128
BPW mS 2.43 2.36
Temp 132.8 F
TPS .57
IAC 125
Idle and IAC are off and I was wondering what would make the ECM set the IAC so high?
I have reset the IAC twice and am running out of patience and hair.
Also, does anybody know of a data recorder that will time up w/a 93 ECM without to much headaches?
I put the car on Datamaster, well after playing around for 10 minutes(another story) and the IAC is way off again.
Here is what Datamaster said:
IDLE 725 Spark Adv 23.00
Fuel trim 16 Map Hg 10.58
LTerm 138 132
STerm 121 128
BPW mS 2.43 2.36
Temp 132.8 F
TPS .57
IAC 125
Idle and IAC are off and I was wondering what would make the ECM set the IAC so high?
I have reset the IAC twice and am running out of patience and hair.
Also, does anybody know of a data recorder that will time up w/a 93 ECM without to much headaches?
Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Car is running much better, but it still has issues. One is really driving me to drink(more).
I put the car on Datamaster, well after playing around for 10 minutes(another story) and the IAC is way off again.
Here is what Datamaster said:
IDLE 725 Spark Adv 23.00
Fuel trim 16 Map Hg 10.58
LTerm 138 132
STerm 121 128
BPW mS 2.43 2.36
Temp 132.8 F
TPS .57
IAC 125
Idle and IAC are off and I was wondering what would make the ECM set the IAC so high?
I have reset the IAC twice and am running out of patience and hair.
Also, does anybody know of a data recorder that will time up w/a 93 ECM without to much headaches?
I put the car on Datamaster, well after playing around for 10 minutes(another story) and the IAC is way off again.
Here is what Datamaster said:
IDLE 725 Spark Adv 23.00
Fuel trim 16 Map Hg 10.58
LTerm 138 132
STerm 121 128
BPW mS 2.43 2.36
Temp 132.8 F
TPS .57
IAC 125
Idle and IAC are off and I was wondering what would make the ECM set the IAC so high?
I have reset the IAC twice and am running out of patience and hair.
Also, does anybody know of a data recorder that will time up w/a 93 ECM without to much headaches?
But, please read this thread in regards to the IAC issue.
http://forums.corvetteforum.com/c4-t...maybe-your-iac
Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
I have been fighting via tuning, an idle problem. Basically I thought due to my camshaft (xe 230/236) it was just causing reversion and my LT1 just wouldnt idle till warm. Also, people reading my logs were saying you have an exhaust leak or a vacuum leak. I chased that forever. So, I wasnt able to run AC in gear at idle, and warm ups were a little tearful due to richness burning my eyes.
According to Data logging, the IAC was working. Wrong, the PCM was working telling the IAC what do do, but it wasnt.
So, I was looking at open loop tune etc for the idle which allot of people do with larger cams.
But I came across this little photo.
http://shbox.com/1/iac2.jpg
Never thought the IAC was bad per sey, because I was expecting a code, which now I know there is none for IAC in the FSM. Just a resistance check. Well I checked mine, AtoB was bad. Bought a new one and WOW it idles on its own immediately, and even allows AC in gear (Kinda lopey, but the IAC is doing what it can to help idle).
So, lessons learned here guys. Just because you dont have a code, doesnt mean you dont have a problem.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Well, the IAC is good and I figured out another part of my problem.
I had the IAC connector 90 degrees off, it is falling apart(which is no excuse) and the clip is gone and I misaligned the connector to the IAC.
Also, could not get Datamaster connected, I am sending a email to Datamaster to see if they can help me.
Also, 2 of my new SP wires are arcing, hoping that is what is causing the miss on my left bank.
I had the IAC connector 90 degrees off, it is falling apart(which is no excuse) and the clip is gone and I misaligned the connector to the IAC.
Also, could not get Datamaster connected, I am sending a email to Datamaster to see if they can help me.
Also, 2 of my new SP wires are arcing, hoping that is what is causing the miss on my left bank.
Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Well, the IAC is good and I figured out another part of my problem.
I had the IAC connector 90 degrees off, it is falling apart(which is no excuse) and the clip is gone and I misaligned the connector to the IAC.
Also, could not get Datamaster connected, I am sending a email to Datamaster to see if they can help me.
Also, 2 of my new SP wires are arcing, hoping that is what is causing the miss on my left bank.
I had the IAC connector 90 degrees off, it is falling apart(which is no excuse) and the clip is gone and I misaligned the connector to the IAC.
Also, could not get Datamaster connected, I am sending a email to Datamaster to see if they can help me.
Also, 2 of my new SP wires are arcing, hoping that is what is causing the miss on my left bank.
The TTS part is a little tricky. When you go to record, I had to play with the com ports by disabling and enabling within device manager of my computer. ie my computer, right click go to properties, then hardware, then device manager and go to com ports in "ports" and disable then renable. I dont know why this worked on mine, it just helped the datamaster link up by forcing the port.
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
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Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Well te IAC plug and SP issues are probably a big issue.
The TTS part is a little tricky. When you go to record, I had to play with the com ports by disabling and enabling within device manager of my computer. ie my computer, right click go to properties, then hardware, then device manager and go to com ports in "ports" and disable then renable. I dont know why this worked on mine, it just helped the datamaster link up by forcing the port.
The TTS part is a little tricky. When you go to record, I had to play with the com ports by disabling and enabling within device manager of my computer. ie my computer, right click go to properties, then hardware, then device manager and go to com ports in "ports" and disable then renable. I dont know why this worked on mine, it just helped the datamaster link up by forcing the port.
I know the IAC was a big problem, car starts right up now. I am going to plug wires tomorrow and then try datamaster again Sat.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
http://www.secondchancegarage.com/public/186.cfm
I One thing, heated O2's should be fairly steady on cross counts @ C Loop, and have fast moving Millivolt readings, if the M/V's are slow the O2's are lazy & need r&r'ing....
I One thing, heated O2's should be fairly steady on cross counts @ C Loop, and have fast moving Millivolt readings, if the M/V's are slow the O2's are lazy & need r&r'ing....
Just came across the thread and read it all. From what I gather one of the O2s are not swinging and varying as the other. The ECM will go into a default rich condition. I don’t think you mentioned your short and long term fuel trim (BLM) numbers. I would suspect they are low (rich) on the bad side.
You said it ran good after new plugs were installed. Sounds like after a while they loaded up due to a rich condition and it started running bad. Replacing that O2 sensor might clear up that problem. You will know quickly when you monitor the O2 numbers for that side if it is varying or not. First check all wires and connections for corrosion etc.
Even if the sensor does not fix all the problems, it might be a big one out of the way.
Le Mans Master
Joined: Feb 1999
Posts: 9,931
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Mine is com port 3.When you go to record, in set up it asks what port, mine is highlighted as the one to go to. If you dont go to set up after trying to record data, it wont connect till you select a port. And it will not always remember your selection