Greetings. I'm trying to replace the O2 sensor in the 328 to see if it fixes a mixture issue. I have it loose at the exhaust end, but I can't seem to find where it plugs in up top. I have looked over the Kjet tech manual, but it doesn't cover this specific application. I'm obviously just missing something here, so can anyone give me a hint? Thanks T
Per the illustration on page 72 of the US 328 OM, the "electronics" is mounted in the rear trunk (but why can't you just follow the O2 sensor or thermocouple wires?): Image Unavailable, Please Login
Lift the air box off the air flow sensor and look under the junction of the frame rails at the rear edge of the engine comp. It will be the green wire together a 2 wire Bosch connector.
Mr. Crall has forgotten more about these cars than most of us will ever know. Repalcement sensors have a longer wiring harness also, make sure to bundle up out of path of exhaust. Best, Carl
Mine has been disconnected since I bought it in 97. What have I been missing in my 84 308? (My gas milage runs between 13 and 18 depending...)
If you don't care about gas mileage you are a doctor how do you feel about clean air? I kinda like it.
Seriously, though, I'll ask about it every once in a while if someone is under the hood for me and basically everybody tells me to just forget it. I mean everybody. My milage is WNL so that won't be helped. No emissions testing around here either. About 3 years ago someone on Ferrarichat hooked theirs up and started having funny problems at idle. It wasn't smooth anymore. Evidentially the probe was adjusting constantly to maintain the correct mix. It was driving this guy nuts and I really don't care for that aggravation. Anybody familiar with this?
Here is more information on O2 sensors, and how they work.... http://hostingprod.com/@aa1car.com/library/o2sensor.htm I have heard of a "hunting" idle...but if everything is working properly, I doubt you would have this problem. I hope you don't have your cat in place...or it may possibly be damaged, if you are currently running too rich.
I guess no one here cares about air quality even the doctors. That is increadibly short sighted. The o2 sensor has no negative effect on power and does a good deal to clean up the air. I sure hope you are not a Physician, please tell me the Dr stands for something else.
On any of the Bosch CIS equipped F with Lambda (K or KE), the overtemp warning light system is completely independent (electrically) from the injection system so, if the O2 sensor is removed, the overtemp warning light system would still be "working". (Not given as a recommendation for disabling/removing the O2 sensor -- just a statement of fact. "Converting" a closed-loop K-Jet with Lambda system to an open-loop K-Jet system doesn't make much sense to me either.)
With K-lambda the O-2 sensor only regulates the mixture at stochiometric at idle or part throttle; after 60% (I think) opening of the throttle switch mixture goes to full enrichment. Effectively whenever you floor the gas, you're getting fuel flow. Steve, Brian - I think this is correct, no? Carl
I thought K-jetronic used a flap type air mass sensor for fuelling rather than a closed loop lamda system? Or does the KE Jetronic system allow for a Lambda sensor?
Yes, it is really only in effect at idle and cruse throttle. It has very little influence at any other time.
The KE system allows for a lambda sensor. My 80 Scirocco is K and no O2 sensor was fitted by the factory (no computer). They both use flap type air mass sensor.
It would make sense then that the Lambda sensor only makes a difference in steady/idle situations for KE. Does anyone know if the Euro 308 GTB QV has KE or K jetronic? (Am considering buying one)
Actually both K and KE came with or without Lambda so all 4 possibilities exist in the F world. Not a complete list, but if my memory doesn't let me down: K-Jet (no Lambda): 308i 2-valve, '83 US 308QV, standard 308QV, standard 328, early standard TR K-Jet with Lambda: '84-'85 US 308QV, US 328 KE-Jet (no Lambda): later standard TR KE-Jet with Lambda: US TR, later CH TR It's specified in Section 3 of the OM under "fuel injection system". It's true that both of the "with Lambda" systems default to an open-loop enriched mixture when you're at the WOT conditon, but you'll be in jail if you spend too much time there in a TR .
My 308 only has one throttle position switch. It is switched as soon as you press the throttle. My 87 16V Scirocco has the same KE lambda system but adds a full throttle position switch too. The Ferrari knows only if you are at idle or moving, the Scirocco knows if you are at idle, moving or flooring it.
