A
Anonymous
Guest
Hi,
Is there a way to still have both O2 Senors with a 4-2-1 exhaust system??
Cheers
Is there a way to still have both O2 Senors with a 4-2-1 exhaust system??
Cheers
Help Support ProjectPuma:
FlashBastd
New member
No.
You could tap and weld a second sensor provision behind your sport cat, but chances are it would still pop the light on.
What I did was to change to a TAPE ECU with FRP management on it. The TAPE ECU doesn't use the second lambda, and changing the wire for the temp gauge looked a lot easier than it sounds. I got mine from PumaSpeed, the difficulty in getting on elsewhere is that you need two PATS chips to program additional keys / your original keys.
Another issue is that by extending the wiring for the lambda(s) you increase the resistance, and this affects how the engine interprets the lambda readings. I assume the FRP management takes account of this as the FRP had a lambda extension from the (Tickford) factory.
If I was doing it over however, I would probably look at a Dreamscience solution, which I believe could be set to ignore the second lambda, and of course the map could be altered to your other modifications.
I have a flowed head, and am after some cams, if / when I do that then I may still end up going for Dreamscience and a rolling road setup.
I take it that like my car, yours is a pretty late one? If there is anything else I can tell you, please ask.
You could tap and weld a second sensor provision behind your sport cat, but chances are it would still pop the light on.
What I did was to change to a TAPE ECU with FRP management on it. The TAPE ECU doesn't use the second lambda, and changing the wire for the temp gauge looked a lot easier than it sounds. I got mine from PumaSpeed, the difficulty in getting on elsewhere is that you need two PATS chips to program additional keys / your original keys.
Another issue is that by extending the wiring for the lambda(s) you increase the resistance, and this affects how the engine interprets the lambda readings. I assume the FRP management takes account of this as the FRP had a lambda extension from the (Tickford) factory.
If I was doing it over however, I would probably look at a Dreamscience solution, which I believe could be set to ignore the second lambda, and of course the map could be altered to your other modifications.
I have a flowed head, and am after some cams, if / when I do that then I may still end up going for Dreamscience and a rolling road setup.
I take it that like my car, yours is a pretty late one? If there is anything else I can tell you, please ask.
A
Anonymous
Guest
hmmm thx for the info, surly the extra 16-20" of wire wont cause that much increase in resistance i bet its only in the 0.0_% area
Yeah i'm thinknig about doing a full rolling road DS setup, will be next year tho!
Yeah shes a 01, click on my sig it'll take you to my project page
Yeah i'm thinknig about doing a full rolling road DS setup, will be next year tho!
Yeah shes a 01, click on my sig it'll take you to my project page
3Ddunk
Member
I know that an early 4-2-1 miltek manifold has two sockets for o2 sensors not sure if its changed now.
FlashBastd
New member
Yes, that is the one I have, but because there isn't a cat in between, both will give the same readings, and will pop the MIL on.
FlashBastd
New member
Studge, just read your project thread, if you have FRP management, then I think you must have a TAPE ECU, which as mentioned above, doesn't use the second lambda. IIRC you can't load the FRP map onto either the DIVE or QQPI management fitted to the twin lambda cars.
To find out, you could either check the lambda readings with your software (not sure on this, by the Snap-On code reader at a relatives garage would give real time lambda readings, so your software may also be able to do this), or just unplug the blue lambda and see what happens. It can take a while for the MIL to come on, for me, it was upto about 300 miles.
Also, when you turn on the ignition, does the MIL come on for a few seconds until you start, or does it just flicker once?
To find out, you could either check the lambda readings with your software (not sure on this, by the Snap-On code reader at a relatives garage would give real time lambda readings, so your software may also be able to do this), or just unplug the blue lambda and see what happens. It can take a while for the MIL to come on, for me, it was upto about 300 miles.
Also, when you turn on the ignition, does the MIL come on for a few seconds until you start, or does it just flicker once?
A
Anonymous
Guest
no i dont have FRP mapping, i have a chip (not sure which chip, paperwork just stats ECU chip)
When i start the car the engine light stays on for a few seconds
I'm prety sure i dont have a tape ECU
When i start the car the engine light stays on for a few seconds
I'm prety sure i dont have a tape ECU
FlashBastd
New member
In that case, your ECU is probably using both lambdas.
TAPE ECU doesn't use the MIL, hence it only flickers for a split second on startup.
Not using the second lambda isn't a prob, it won't affect the way the car runs, but it will put the MIL on.
TAPE ECU doesn't use the MIL, hence it only flickers for a split second on startup.
Not using the second lambda isn't a prob, it won't affect the way the car runs, but it will put the MIL on.
A
Anonymous
Guest
So not putting the 2nd o2 sensor after the cat wont affect the running of the car at all???
FlashBastd
New member
No, it's purpose is to let you know if the cat isn't doing it's job, so if the 2nd one reads the same as, or higher than the first, either the cat isn't working, or the first sensor isn't working.
The first sensor does affect fuelling, etc. but the second one is only there to pop the light on if there is a problem.
The first sensor does affect fuelling, etc. but the second one is only there to pop the light on if there is a problem.
Similar threads
Vehicle For Sale
Ford puma - Ex Welsh rally school car
