Dynatech header HELP!!
Thread Starter
Racer
Joined: May 2004
Posts: 414
Likes: 0
From: Tucson Az
St. Jude Donor '04 & '05
Dynatech header HELP!!
Ok my car is on day three of a Dynatech header install and the main problem appears to be that the driver side 02 sensor is mounted in 1 tube instead of the collector and is jacking up the readings, causing it to run very poorly. Has this happened to anyone? Does anyone remember how far forward of the flage their o2 sensor was on the driver side? I have already had them coated so am I screwed for the cost of the coating, assuming dynatech will get me a new set? Any pics?
Many thanks
Pete
Many thanks
Pete
Burning Brakes
Joined: Feb 2004
Posts: 831
Likes: 0
From: Poland oh
The original front sensors should be in the collectors. They cross over eachother. when installed giving the appearance that the wrong side is in the collector but this is compensated in the wiring layout from the factory. There should have been extensions provided to make the fronts reach the new location. These harnesses should only work for these o2's. The rears get mounted after the cats and do not require extensions. I think I got it all straight. It's been a year since I did the install. Check the manual for reference and crawl under the car and check the set-up.
Which o2's are the problem, Front or Rears? They may be contamenated with neverseize or similar lube. If you need me to get out my manual I can.
Which o2's are the problem, Front or Rears? They may be contamenated with neverseize or similar lube. If you need me to get out my manual I can.
Burning Brakes
Joined: Feb 2004
Posts: 831
Likes: 0
From: Country Boys Can Survive.
I had zero issues after the install that I did myself in my garage. I also installed NEW front 02 sensors because I read that the front sensors are the one's most critical for engine performance. Are your sensors the original? I would try if I were you NEW front 02 sensors. Good luck!!! 
BTW, for the FRONT sensors, the drivers side sensor is installed in the drivers side header, and the same on the passenger side, obviously. On the rear sensors, some say they should be crossed, but, mine are not crossed and the car runs fine! 
BTW, for the FRONT sensors, the drivers side sensor is installed in the drivers side header, and the same on the passenger side, obviously. On the rear sensors, some say they should be crossed, but, mine are not crossed and the car runs fine!
Last edited by loudsam; May 25, 2005 at 10:46 PM.
Thread Starter
Racer
Joined: May 2004
Posts: 414
Likes: 0
From: Tucson Az
St. Jude Donor '04 & '05
Ok now I am confused 
The problem is in the front driver side, should the o2 wires appear crossed or not? The mechanic is saying that the 02 is not in the collector but rather in an individual tube thus causing the problem.
What is a sure-fire way to find out if the o2s are right?
Many thanks!!!
Pete
The problem is in the front driver side, should the o2 wires appear crossed or not? The mechanic is saying that the 02 is not in the collector but rather in an individual tube thus causing the problem. What is a sure-fire way to find out if the o2s are right?
Many thanks!!!
Pete
Thread Starter
Racer
Joined: May 2004
Posts: 414
Likes: 0
From: Tucson Az
St. Jude Donor '04 & '05
I should mention that I have an 04.
As I understand it from searching:
The front 02s: the drivers side wire goes to the driver side collecter and the passenger side wire goes to the passenger side collector using extensions?
Rears: the rears go are the same, driver side wire to driver side exhaust pipe etc.
I am headed there first thing tomorrow so any help would be greatly appreciated
thanks
As I understand it from searching:
The front 02s: the drivers side wire goes to the driver side collecter and the passenger side wire goes to the passenger side collector using extensions?
Rears: the rears go are the same, driver side wire to driver side exhaust pipe etc.
I am headed there first thing tomorrow so any help would be greatly appreciated
thanks
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
The front O2's are plugged into the same side they are on, i.e., the driver's side O2 gets plugged into the driver's side plug on the frame and the passenger's side get plugged into the passenger's side on the frame.
The rears are the opposite. The driver's side O2 when installed will be at an angle towards the passenger side of the car and the wire runs up the passenger's side of the tunnel heat shield to the passenger side plug on the frame. Passenger's side gets plugged into the driver's side and the wire will run up the driver's side of the tunnel heat shield.
I have the QTP's and my front O2 sensors point straight up so it is fairly easy not to mess up. From the above post, is sounds like your front O2's are angled inward so it might be easier to get wrong. I would trace each connection and make sure they are correct. That would cause a problem if they are not plugged into the correct position. Hopefully, that is the source of your problem and you can easily straighten it out.
Good luck
The rears are the opposite. The driver's side O2 when installed will be at an angle towards the passenger side of the car and the wire runs up the passenger's side of the tunnel heat shield to the passenger side plug on the frame. Passenger's side gets plugged into the driver's side and the wire will run up the driver's side of the tunnel heat shield.
I have the QTP's and my front O2 sensors point straight up so it is fairly easy not to mess up. From the above post, is sounds like your front O2's are angled inward so it might be easier to get wrong. I would trace each connection and make sure they are correct. That would cause a problem if they are not plugged into the correct position. Hopefully, that is the source of your problem and you can easily straighten it out.
Good luck
Thread Starter
Racer
Joined: May 2004
Posts: 414
Likes: 0
From: Tucson Az
St. Jude Donor '04 & '05
OK so as I understand it, the fronts are not crossed (with the extentions) and the rears are crossed?
Looking at pictures it would appear that they both "should" cross as the o2s actually point toward the opposite side, so I can see how people get them messed up
Thanks!!
Looking at pictures it would appear that they both "should" cross as the o2s actually point toward the opposite side, so I can see how people get them messed up
Thanks!!
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Race Director
Joined: Jun 2004
Posts: 19,459
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From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Alright- let me try and help with this and not confuse the issue more 
I have an 01 and just installed the Dynatech's a few weeks ago. I just called my buddy who is a mechanic and did this install with me.
ON my car the stock system came with the O2's crossed..so we hooked the Dynatech system up that way..and the car ran like crap..cylinder#1 misfireing running way to rich..so we re-wired the O2's like this:
Front 02's right side to right side and left to left
Rear 02's Right to Right , left to left
in other words, do not cross the O2's. This fixed the problem.
Edit- also double check all your plugs, wires, coil packs to make sure they are not damaged/loose etc..
I have an 01 and just installed the Dynatech's a few weeks ago. I just called my buddy who is a mechanic and did this install with me.ON my car the stock system came with the O2's crossed..so we hooked the Dynatech system up that way..and the car ran like crap..cylinder#1 misfireing running way to rich..so we re-wired the O2's like this:
Front 02's right side to right side and left to left
Rear 02's Right to Right , left to left
in other words, do not cross the O2's. This fixed the problem.
Edit- also double check all your plugs, wires, coil packs to make sure they are not damaged/loose etc..
Last edited by FrankTank; May 26, 2005 at 10:20 AM.
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Pete- also have your mechanic hook up his scanner and find out how the O2's are running , rich/lean? THis should point you in the right direction.
Once you get the car running good and get this fixed.. you are probably still going to have code P0420, which is a low effiecieny cat-code..basically your 02's and stock tuning do not like the highflow cats..but this should not effect the wayy the car runs. I have this code now and will eventually get it tuned out with LS1 edit or just buy 02 sims. My car runs great.
Good luck
Once you get the car running good and get this fixed.. you are probably still going to have code P0420, which is a low effiecieny cat-code..basically your 02's and stock tuning do not like the highflow cats..but this should not effect the wayy the car runs. I have this code now and will eventually get it tuned out with LS1 edit or just buy 02 sims. My car runs great.
Good luck
Last edited by FrankTank; May 26, 2005 at 10:21 AM.
Thread Starter
Racer
Joined: May 2004
Posts: 414
Likes: 0
From: Tucson Az
St. Jude Donor '04 & '05
That was it, the front 02s were crossed. Swapped them and it started right up BUT we are not getting good o2 readings on the right front sensor. It seems to cut to 0 every now and again when the car is running?? They are driving the car to put some miles on it to see if it changes, has anyone seen this?
thanks!
Pete
thanks!
Pete
Race Director
Joined: Nov 2003
Posts: 11,059
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From: Menifee CA
Originally Posted by FrankTank
Alright- let me try and help with this and not confuse the issue more I have an 01 and just installed the Dynatech's a few weeks ago. I just called my buddy who is a mechanic and did this install with me.
ON my car the stock system came with the O2's crossed..so we hooked the Dynatech system up that way..and the car ran like crap..cylinder#1 misfireing running way to rich..so we re-wired the O2's like this:
Front 02's right side to right side and left to left
Rear 02's Right to Right , left to left
in other words, do not cross the O2's. This fixed the problem.
Edit- also double check all your plugs, wires, coil packs to make sure they are not damaged/loose etc..
I have an 01 and just installed the Dynatech's a few weeks ago. I just called my buddy who is a mechanic and did this install with me.ON my car the stock system came with the O2's crossed..so we hooked the Dynatech system up that way..and the car ran like crap..cylinder#1 misfireing running way to rich..so we re-wired the O2's like this:
Front 02's right side to right side and left to left
Rear 02's Right to Right , left to left
in other words, do not cross the O2's. This fixed the problem.
Edit- also double check all your plugs, wires, coil packs to make sure they are not damaged/loose etc..
You did not cross the o2 sensors???????
Are you sure your buddy is a mechanic???????
The sensors should go back the same way they were on stock headers!
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Originally Posted by pdykinga
That was it, the front 02s were crossed. Swapped them and it started right up BUT we are not getting good o2 readings on the right front sensor. It seems to cut to 0 every now and again when the car is running?? They are driving the car to put some miles on it to see if it changes, has anyone seen this?
thanks!
Pete
thanks!
Pete
Glad you got it straightened out.
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Originally Posted by MUKAKsC5
what are you talking about????????
You did not cross the o2 sensors???????
Are you sure your buddy is a mechanic???????
The sensors should go back the same way they were on stock headers!
You did not cross the o2 sensors???????
Are you sure your buddy is a mechanic???????
The sensors should go back the same way they were on stock headers!
it's his 9-5 job. The trick here is the angle that the O2 bungs are pointing I think that confuses people..when we went back and checked the Dynatech directions, it does point out the difference. You'lll see from Pdykng's post that he had the front 02's crossed and the car was not running right...he switched them so they were not crossed and that solved his problem.I had the very same problem...and when we scanned the car, having the O2's crossed caused the car to run rich and mis-fire Cyl#1..when we switched them to be un-crossed the car ran perfect.
