Help with startup
#1
Junior Member
Thread Starter
Join Date: May 2011
Location: Corvallis, OR
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 Iroc
Engine: 5.7L TPI
Transmission: Built 700R4
Axle/Gears: 3.23 posi
Help with startup
i am trying to tune my brothers car and the main thing he wants fixed is the start up. It will fire up good, then stumble, and then catch itself again. i run the same tune on my car and don't have this issue. both cars are 87 '165 6E. mine is a 5.7 and his 5.0. Thanks for any input
#2
Junior Member
Thread Starter
Join Date: May 2011
Location: Corvallis, OR
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 Iroc
Engine: 5.7L TPI
Transmission: Built 700R4
Axle/Gears: 3.23 posi
Re: Help with startup
Here is the start up of my car. the IAC positions are completely different despite being the same settings. any ideas?
#3
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,405
Likes: 0
Received 216 Likes
on
202 Posts
Car: check
Engine: check
Transmission: check
Re: Help with startup
I would first set the minimum air and the TPS at idle.
I really can't see that the ECM would set the IAC at 0 (closed, maybe 1 or 2 steps) for cranking. Doesn't make sense.
And having the IAC at 160 for cranking is rather high.
Are these both cold starts at the same engine temperature?
Would be better if we could look at the BINs. A short data log of each would also help (in formatted text or .csv format)
RBob.
I really can't see that the ECM would set the IAC at 0 (closed, maybe 1 or 2 steps) for cranking. Doesn't make sense.
And having the IAC at 160 for cranking is rather high.
Are these both cold starts at the same engine temperature?
Would be better if we could look at the BINs. A short data log of each would also help (in formatted text or .csv format)
RBob.
#4
Junior Member
Thread Starter
Join Date: May 2011
Location: Corvallis, OR
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 Iroc
Engine: 5.7L TPI
Transmission: Built 700R4
Axle/Gears: 3.23 posi
Re: Help with startup
Rbob, thanks for the help. How do i go about setting the min air and TPS?
Both are cold starts.
I couldn't get the bin and logs to upload so i hope these links work.
Bin:
https://www.dropbox.com/s/93ufoqcbbpjcoyw/ARAP-5.bin
5.0 with loop:
https://www.dropbox.com/s/l8wdyn3gekkziwn/3-14a.csv
5.7
https://www.dropbox.com/s/vd31ptimcb...14-Startup.csv
Let me know if these don't work. i hope they do, and thanks again for the help
Both are cold starts.
I couldn't get the bin and logs to upload so i hope these links work.
Bin:
https://www.dropbox.com/s/93ufoqcbbpjcoyw/ARAP-5.bin
5.0 with loop:
https://www.dropbox.com/s/l8wdyn3gekkziwn/3-14a.csv
5.7
https://www.dropbox.com/s/vd31ptimcb...14-Startup.csv
Let me know if these don't work. i hope they do, and thanks again for the help
#5
Supreme Member
Join Date: Aug 2011
Location: Aloha, Oregon
Posts: 1,178
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Christine Z28
Engine: RV Cam and Intake 350 SBC
Transmission: 5speed
Axle/Gears: 3.08 ls Posi
Re: Help with startup
I think RBob is referring to this. http://forum.grumpysperformance.com/...php?f=32&t=168 scroll down a bit to get to the actual instructions.
#6
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,405
Likes: 0
Received 216 Likes
on
202 Posts
Car: check
Engine: check
Transmission: check
Re: Help with startup
The short version:
https://www.thirdgen.org/tpimod2
One item not mentioned is the maximum TPS voltage at WOT. This needs to be no more then 4.6 volts. Otherwise the ECM can think that the TPS is bad and will drop out of PE mode.
RBob.
https://www.thirdgen.org/tpimod2
One item not mentioned is the maximum TPS voltage at WOT. This needs to be no more then 4.6 volts. Otherwise the ECM can think that the TPS is bad and will drop out of PE mode.
RBob.
Thread
Thread Starter
Forum
Replies
Last Post
tyeo098
Tech / General Engine
38
11-30-2015 06:27 PM