89 TPI motor
Thread Starter
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
89 TPI motor
I got hold of an autoxray 6000.
here are my readings, are they good?
TPS, 0.49 idle - 4.33WOT
knock sensor 46, 0 retards
intergrator 128
02, readings all over the place
02 cross counts, 22
block learn 149
spark advance 25.
does everything seem inline?
The coolant temps seemed good.
the IAT seemed good.
anything I should look for, as the car runs terrible when cold, but runs nice once in closed loop.
here are my readings, are they good?
TPS, 0.49 idle - 4.33WOT
knock sensor 46, 0 retards
intergrator 128
02, readings all over the place
02 cross counts, 22
block learn 149
spark advance 25.
does everything seem inline?
The coolant temps seemed good.
the IAT seemed good.
anything I should look for, as the car runs terrible when cold, but runs nice once in closed loop.
Last edited by larryfs; Oct 14, 2007 at 11:04 AM.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Larry: I have a 89 model and recently acquired a scan tool. Here are my comments (with limited experience) on your readings.
TPS readings: the idle reading should be .54 +/-.06 volts and you are on the low side of this tolerance. Ajust it to .54/.55 volts. The WOT reading is exactly what I get on my 89.
The O2 reading should rapidly fluctuate from about .2 to .9 volts and yours appear to be doing this.
The block learn (BLM??) seems (or running very lean high) to me.
If you will send me your email, I will send you a Word document giving all the specs (at idle) from the GM Helms factory service manual. My eamail is samlam@charter.net.
I would recommend that you set the timing of the engine and reset the base idle. Do not use the procedure for setting the base idle in the tech section, as it contains a critical error. Using the tech procedure will not give you the desired result. I have the Gordon Killebrew procedure for setting the base idle and it conforms with the details in the factory service manual.
Hope this info is helpful to you.
TPS readings: the idle reading should be .54 +/-.06 volts and you are on the low side of this tolerance. Ajust it to .54/.55 volts. The WOT reading is exactly what I get on my 89.
The O2 reading should rapidly fluctuate from about .2 to .9 volts and yours appear to be doing this.
The block learn (BLM??) seems (or running very lean high) to me.
If you will send me your email, I will send you a Word document giving all the specs (at idle) from the GM Helms factory service manual. My eamail is samlam@charter.net.
I would recommend that you set the timing of the engine and reset the base idle. Do not use the procedure for setting the base idle in the tech section, as it contains a critical error. Using the tech procedure will not give you the desired result. I have the Gordon Killebrew procedure for setting the base idle and it conforms with the details in the factory service manual.
Hope this info is helpful to you.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
At normal operating temp, I believe the stock tune should have you at 20* total. Under that temp. there are add ons, that would bump it approx.6* Depending on that, 25*off idle might not be bad.
However, if you have raised the base timing past 6*, this would account for some of the info. you have posted. This could contribute to why you have a 40 + number for SK's.counts, and higher blm (lean) no.s at idle. Base timing will need to be looked at and possibly re-set. Under normal driving, you will want to monitor the SK'S, and how much (if any) timing is pulled.
BLM 150+ is way lean at idle, an int. reading of 128 would tell me it is not trying to bring it in line. Is there an AFPR? If so where is the FP. set? The blm will also need to be monitored as you are doing regular driving and see what numbers you are getting.
Last edited by mseven; Oct 15, 2007 at 10:02 AM.
Thread Starter
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
a few things I should mention. The motor is all stock with 2 exceptions:
I have an SLP cat back, and an SLP PROM. These mods are from years ago. The SLP prom (which they no longer carry) turned the fan temps on earlier, but I can't feel any SOTP power increase. But that may be why the timing is advanced.
The BLM's were 155 crusing down the highway.
I'm guessing I should go back to the stock prom, and just get a 200F fan switch.
I have an SLP cat back, and an SLP PROM. These mods are from years ago. The SLP prom (which they no longer carry) turned the fan temps on earlier, but I can't feel any SOTP power increase. But that may be why the timing is advanced.
The BLM's were 155 crusing down the highway.
I'm guessing I should go back to the stock prom, and just get a 200F fan switch.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
The BLM's were 155 crusing down the highway.
I'm guessing I should go back to the stock prom, and just get a 200F fan switch.
I'm guessing I should go back to the stock prom, and just get a 200F fan switch.
When I swapped mine out w/everything the same it has had the effect of richening. The numbers on scans of mine showed it had changed the load range (the higher load range adds more fuel) and at idle, and acted as if it was already at half throttle, but actually seemed somewhat more responsive (on-off switch effect). I believe it is because the motor will be seeing more air earlier which is why it put it at a different load range. (same goes in AE).
This is what I have found, yours may or may not have the same results. Personally, if the plan is to use it, I would work everything in together now and not have back track in tuning later.
Last edited by mseven; Oct 15, 2007 at 11:27 AM.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Larry: Email sent to you on 89 ECM data and base idle setting procedure. A question to answer is: do you have the stock Multec injectors in your car. If so, this may be the answer to your question on running lean.
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Thread Starter
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
It's my friends unit, so I can toy with it for a while. I like the hand held aspect. I drive and look at it all day. Almost wrecked the car 4 times 
I don't know if I can do that with a laptop. Too big and bulky to hold up and look at while driving.
I don't know if I can do that with a laptop. Too big and bulky to hold up and look at while driving.
