MAP won't go above 29...Diacom shot within...is this normal?
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Joined: Apr 2000
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From: Wilmington, IL Age: 35
MAP won't go above 29...Diacom shot within...is this normal?
Okay, here's the deal. As some of you know, I have a Miniram equipped ZZ4 with AFR195's and a LT4 "HotCam". The computer is a Speed Density 7730.
I seem to have a problem with my MAP semsor, but I'd like to know for sure if it's either hardware related, or due to a variable in my PROM that needs to be adjusted.
No matter what I do, (regular driving, moderate throttle, or all out WOT), I can't seem to register anything on Diacom above 29kpa. All other aspects of the MAP seem to be in line, I idle fine with about 15-16Kpa. I don't get any SES lights either.
The MAP is practically brand new with only 1400 miles on it. I don't seem to really have any driveability problems per se, but it might just be that I'm used to the way it acts since it's probably been this way since day one.
So, my question is.....Does it look like a faulty MAP, or maybe something that needs to be changed when I burn another EEPROM? Check out the 1/4 run that I recorded on Diacom, and you'll see what I mean.
Thanks for any input guys.
------------------
86 Trans Am WS6 Black with tinted windows, shaved door handles
ZZ4, Mini-ram, true duals, LT4 HotCam, AFR 195 heads.
***Too many other mods to mention***
"In the future, cities will become deserts,
roads will become battlefields, and the hope of mankind
will appear as a stranger" The Road Warrior
[This message has been edited by Steves ZZ5 (edited May 21, 2001).]
I seem to have a problem with my MAP semsor, but I'd like to know for sure if it's either hardware related, or due to a variable in my PROM that needs to be adjusted.
No matter what I do, (regular driving, moderate throttle, or all out WOT), I can't seem to register anything on Diacom above 29kpa. All other aspects of the MAP seem to be in line, I idle fine with about 15-16Kpa. I don't get any SES lights either.
The MAP is practically brand new with only 1400 miles on it. I don't seem to really have any driveability problems per se, but it might just be that I'm used to the way it acts since it's probably been this way since day one.
So, my question is.....Does it look like a faulty MAP, or maybe something that needs to be changed when I burn another EEPROM? Check out the 1/4 run that I recorded on Diacom, and you'll see what I mean.
Thanks for any input guys.
------------------
86 Trans Am WS6 Black with tinted windows, shaved door handles
ZZ4, Mini-ram, true duals, LT4 HotCam, AFR 195 heads.
***Too many other mods to mention***
"In the future, cities will become deserts,
roads will become battlefields, and the hope of mankind
will appear as a stranger" The Road Warrior
[This message has been edited by Steves ZZ5 (edited May 21, 2001).]
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Steves ZZ5:
Okay, here's the deal. As some of you know, I have a Miniram equipped ZZ4 with AFR195's and a LT4 "HotCam". The computer is a Speed Density 7730.
I seem to have a problem with my MAP semsor, but I'd like to know for sure if it's either hardware related, or due to a variable in my PROM that needs to be adjusted.
No matter what I do, (regular driving, moderate throttle, or all out WOT), I can't seem to register anything on Diacom above 29kpa. All other aspects of the MAP seem to be in line, I idle fine with about 15-16Kpa. I don't get any SES lights either.
The MAP is practically brand new with only 1400 miles on it. I don't seem to really have any driveability problems per se, but it might just be that I'm used to the way it acts since it's probably been this way since day one.
So, my question is.....Does it look like a faulty MAP, or maybe something that needs to be changed when I burn another EEPROM? Check out the 1/4 run that I recorded on Diacom, and you'll see what I mean.
Thanks for any input guys.
</font>
Okay, here's the deal. As some of you know, I have a Miniram equipped ZZ4 with AFR195's and a LT4 "HotCam". The computer is a Speed Density 7730.
I seem to have a problem with my MAP semsor, but I'd like to know for sure if it's either hardware related, or due to a variable in my PROM that needs to be adjusted.
No matter what I do, (regular driving, moderate throttle, or all out WOT), I can't seem to register anything on Diacom above 29kpa. All other aspects of the MAP seem to be in line, I idle fine with about 15-16Kpa. I don't get any SES lights either.
The MAP is practically brand new with only 1400 miles on it. I don't seem to really have any driveability problems per se, but it might just be that I'm used to the way it acts since it's probably been this way since day one.
So, my question is.....Does it look like a faulty MAP, or maybe something that needs to be changed when I burn another EEPROM? Check out the 1/4 run that I recorded on Diacom, and you'll see what I mean.
Thanks for any input guys.
</font>
looks like you might be set at inches of merc.
If that's K/Pa then something is wrong.
Maybe grounded improperly, check that it has 5v to it, and if you did some custom wiring the grounds and power fort the TPS MAP and others are meant to be wired and grounded in a very specific fashion.
I have a 1984 MAP that I'm still using
thou some serious backfires can bust the guts in one
Thread Starter
Member
Joined: Apr 2000
Posts: 223
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From: Wilmington, IL Age: 35
Oh damn....Guess what... 
Thanks Grumpy. i WAS set at Hg instead of Kpa. I Feel like a turd now..hehehh.
Well, all is good, and thanks for your help..
:::runs away to hide:::
Thanks Grumpy. i WAS set at Hg instead of Kpa. I Feel like a turd now..hehehh.
Well, all is good, and thanks for your help..
:::runs away to hide:::
Supreme Member
Joined: Jul 1999
Posts: 2,844
Likes: 4
From: Maryland
Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
Anyone care to *try* to explain why the rpms in second gear (and even in third) decrease and increase and then decrease and then increase repetitively? I have a similar problem (although not as drastic as this one) that I am currently troubleshooting.
Tim
------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org
Tim
------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by TRAXION:
Anyone care to *try* to explain why the rpms in second gear (and even in third) decrease and increase and then decrease and then increase repetitively? I have a similar problem (although not as drastic as this one) that I am currently troubleshooting.
Tim
The ecm has a fixed procesing rate. It also uses filtering. Then toss in a converter, or clutch slippage, road adhesion, and yes the line has squiggles in it.
that graph ain't nothing for showing poor linear accleration.
Wish I'd saved some 10 sec GN run stuff I had. It really showed the converter characteristics. The X% of slippage is not a fixed deal. It can be all over the place, add some wheel spin, and it get almost confusing to see what's going on til you look at the VSS, and see who things track. Diacom while good, is nothing compared to some of the factory racing team stuff.
</font>
Anyone care to *try* to explain why the rpms in second gear (and even in third) decrease and increase and then decrease and then increase repetitively? I have a similar problem (although not as drastic as this one) that I am currently troubleshooting.
Tim
The ecm has a fixed procesing rate. It also uses filtering. Then toss in a converter, or clutch slippage, road adhesion, and yes the line has squiggles in it.
that graph ain't nothing for showing poor linear accleration.
Wish I'd saved some 10 sec GN run stuff I had. It really showed the converter characteristics. The X% of slippage is not a fixed deal. It can be all over the place, add some wheel spin, and it get almost confusing to see what's going on til you look at the VSS, and see who things track. Diacom while good, is nothing compared to some of the factory racing team stuff.
</font>
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Steves ZZ5:
</font>
</font>
You'll never guess how I spotted that, LOL. I got all twisted outta shape once over it, and then like a month later did it again. Now that is a real turd feeling.....
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