Power loss after installing h pipe
03-19-2010, 10:24 PM
#1
1st Gear Member
Thread Starter
Join Date: Aug 2009
Location: Indiana
Posts: 56
Power loss after installing h pipe
I have a pretty much stock motor and have bbk shorties. Today i installed a h pipe to get rid of the crap straight pipes the previous owner installed. One of the 02 sensors stripped out so i just plugged the hole. I went out to have some fun today and the car felt like i lost about 20 horse. Cars i always stick with blew me away. I am sure it has nothing to do with the h as i should have gained from it. Is it because of the o2 sensor missing?
03-19-2010, 11:33 PM
#3
1st Gear Member
Thread Starter
Join Date: Aug 2009
Location: Indiana
Posts: 56
dont have a cel built my own cluster a few years back. I am going to try to pull codes tomorrow and see what i got. I didnt think it would make this much of a difference to have o2s or not with such an old computer system
03-19-2010, 11:40 PM
#4
6th Gear Member
Join Date: May 2004
Location: las vegas, nv
Posts: 9,092
because they are old, makes the o2s that much more important. the entire tune is based off of just two inputs, o2s and maf
03-19-2010, 11:42 PM
#5
1st Gear Member
Join Date: Mar 2010
Location: nebraska
Posts: 71
im not for sure if the 90's stangs use the sensors.(as i am new) but you are on the right track. pull the codes and go from there..
but what makes no sense is, it was straight pipe before and you added an h pipe. so really it shouldnt have bad a negative affect.
but what makes no sense is, it was straight pipe before and you added an h pipe. so really it shouldnt have bad a negative affect.
03-19-2010, 11:48 PM
#6
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
judas priest!! put the o2's back in, they measure oxygen content in the exhaust stream and are a necessary input to the ecm for adjusting inj pulse width accordingly to enrich or lean the a/f....hence you may experience drivibility issues as you describe
03-20-2010, 12:11 AM
#7
6th Gear Member
Join Date: Jul 2006
Location: San Diego, CA
Posts: 6,882
why not? do you think Ford put them on there for fun?
The EEC-IV system relies on O2 sensors to do real-time calculations for your fuel(and timing not sure on that) table, without them the ECU falls back on inefficient pre-programmed tables
EDIT: holy crap talk about forum lag, there was just one reply when I opened this thread
The EEC-IV system relies on O2 sensors to do real-time calculations for your fuel(and timing not sure on that) table, without them the ECU falls back on inefficient pre-programmed tables
EDIT: holy crap talk about forum lag, there was just one reply when I opened this thread
03-20-2010, 05:50 PM
#9
1st Gear Member
Thread Starter
Join Date: Aug 2009
Location: Indiana
Posts: 56
I installed a new o2 sensor in the place of the one i had removed and it seems to have the power back mostly. I also played with timing a little bit. Next week ill get another for bank 2.
