9900-171 Holley throttle body help....
06-11-2009, 01:19 PM
#1
Senior Member
Thread Starter
iTrader: (5)
Join Date: Feb 2005
Location: GA
Posts: 838
Likes: 0
Received 0 Likes
on
0 Posts
Car: '90 C1500
Engine: SBC MPFI
Transmission: 4L80e
Axle/Gears: 4.30
9900-171 Holley throttle body help....
Please delete...
Last edited by YenkoST; 06-12-2009 at 11:31 PM.
06-12-2009, 05:31 PM
#3
Senior Member
Thread Starter
iTrader: (5)
Join Date: Feb 2005
Location: GA
Posts: 838
Likes: 0
Received 0 Likes
on
0 Posts
Car: '90 C1500
Engine: SBC MPFI
Transmission: 4L80e
Axle/Gears: 4.30
Re: 9900-171 Holley throttle body help....
Finally got through to Holley and here is what we got:
TPS tested out at 4.90 volts which is approx. 5 volt reference that I needed so TPS has the supplied voltage....voltage on idle is .60 with a 1.71 WOT voltage. TPS sounds like it is bad...what do y'all think?
IAC - Found out that the harness that I bought for the throttle body is wired wrong.
GM style:
A - IAC A Hi
B - IAC A Low
C - IAC B Hi
D - IAC B Low
Holley's IAC:
A - IAC A Low
B - IAC B Hi
C - IAC B Low
D - IAC A Hi
So, IAC needs to be re-wired correctly and hopefully will fix the idling high issue.
But what about the TPS....is that acceptable or do I need a new one?
TPS tested out at 4.90 volts which is approx. 5 volt reference that I needed so TPS has the supplied voltage....voltage on idle is .60 with a 1.71 WOT voltage. TPS sounds like it is bad...what do y'all think?
IAC - Found out that the harness that I bought for the throttle body is wired wrong.
GM style:
A - IAC A Hi
B - IAC A Low
C - IAC B Hi
D - IAC B Low
Holley's IAC:
A - IAC A Low
B - IAC B Hi
C - IAC B Low
D - IAC A Hi
So, IAC needs to be re-wired correctly and hopefully will fix the idling high issue.
But what about the TPS....is that acceptable or do I need a new one?
06-12-2009, 08:10 PM
#4
Senior Member
Thread Starter
iTrader: (5)
Join Date: Feb 2005
Location: GA
Posts: 838
Likes: 0
Received 0 Likes
on
0 Posts
Car: '90 C1500
Engine: SBC MPFI
Transmission: 4L80e
Axle/Gears: 4.30
Re: 9900-171 Holley throttle body help....
Re-pinned the IAC and idle is a lot better; however, the IAC still doesn't respond when starting to help the engine start. However, it idles fine but give it any gas and the IAC just takes off and doesn't stop....what's going on here?
06-12-2009, 11:30 PM
#5
Senior Member
Thread Starter
iTrader: (5)
Join Date: Feb 2005
Location: GA
Posts: 838
Likes: 0
Received 0 Likes
on
0 Posts
Car: '90 C1500
Engine: SBC MPFI
Transmission: 4L80e
Axle/Gears: 4.30
Re: 9900-171 Holley throttle body help....
Ok mods...you can delete this thread....I figured it out on my own...thanks.
Thread
Thread Starter
Forum
Replies
Last Post
Terrell351
Engine/Drivetrain/Suspension Parts for Sale
5
06-13-2021 01:13 PM
mdtoren
Tech / General Engine
0
08-16-2015 05:45 PM
