After speaking to my mechanic today, bit concerned about the DET sensor bypass I did. He certainly wasn't impressed. I told him I know to keep boost down under 3500rpm. Basically, take it easy when driving in general. I have read that the bypass is quite common as a temp fix but, how temp are we talking? Few thousand k, indefinitely as long as you take it easy? The AFR that the diagnostics test showed today worries me though. Especially the leaning of the fuel on the valves. Mechanic also believes the white/grey smoking could be fuel being tossed down the chambers due to the lean AFR reading. This would explain the poor economy I get. Another reason to question the DET bypass trick? Again, the AFR reading is what concerns me. Though it is only slightly lean, would this be a concern for you. Just interested in your comments as I contemplate the plenum pull. I need to do it eventually in order to replace the leaky rocker cover sooner or later but really don't want to such a pita job tomorrow like Anyone done this & had there AFR's checked or any issues arise? Thanks ahead for comments guys
Many people here (myself included) have run fine without a det sensor for years. If you want to put one one, you can put a new OEM one in but relocated to a more convenient position so you don't have to remove plenums to get to the stock location. ...you sound like you have an issue though if it's leaning out. I'd be checking this out firstly. Assuming you're running stock ECU + tune, things you can start with is check fuel pressure, dampener, filter, etc. Make sure your injectors are all firing nicely, you may have to pull them out and have ultrasonically cleaned and flow tested to make sure.
Let your mechanic be not impressed I have run without a det sensor since 2003. and I give mine WOT quite regularly. And guess what. It's still fine and still goes like crazy. Sure I would get the lean condition looked at. But how lean are you talking? what are your AFR's?
Did you have the afr checked at idle or under load on the dyno? The comment about fuel being tossed around in the chamber makes no sense at all and bypassing the det sensor is fine unless there is another issue. How lean was it?
If you have bypassed your DET sensor correctly it will have NO effect on fuel consumption. Also white smoke is generally coolant/water. Black smoke is fuel.. Check for boost leaks, clean all your electrical connectors, reset your ecu and see how you go. Replacing the DET sensor is not a easy job. You need to also remove the lower plenum OR gearbox. Relocate or bypass permanently.
I did see the vid of the relocation come to think of it. Car sat for 4 months so anythings possible I guess.
Bugger. Think I should check/replace all hoses I think are suss. I know when I replaced the balance tube I didn't use sealant & old seals were crap but I needed to get it down to mechanic this morning pronto for the other main concern. I woulda thought the white grey smoke was coolant but he mentioned it happened with fuel once. Weird as fuel is definately black.
1.1 lambda is fine for idle and low load revs. That is in no way damaging and in fact is optimum for fuel economy
He did say it is minimal but mechanics I suppose err on the side of caution to cover themselves. Bit anal. Thanks, makes me feel a little more confident. The plugs looked a good colour to me.
Just a side note. Assuming my CTS sensor is working. I replaced the plug & error went away. Having the det sensor bypassed wouldn't effect cold start would it? What I mean is I understand being disabled means there is no protection (richen up fuel) under load. The o2 sensors don't measure fuel but the CTS sensor would take car of riching up on start ups = cold start protection?
You need to understand that by bypassing the det sensor you are returning the ecu to is standard operating condition. It is running how it is supposed to. With it now bypassed you need to forgef about it. If u are having problems, look elsewhere
I wouldn't want it running any leaner that's all. I know the basics of sensor operation but confess, I'm lacking in the finer details so appreciate the input. Even though I'm reading/learning to get the experience, I'm just a bit apprehensive concerning my new toy until I understand the Zed a little better.
Yes but generally speaking the det sensor does not control fuel mixture ,u need to be looking elsewhere for that, an air leak, blocked fuel filter, dirth injectors to name a few. Also the afr test you did is as good as useless. If you ran it under load on the dyno it will most likely be at 0.80 lambda
I suppose it was a cheap test to identify any obvious probs? I feel since the plugs are pretty good colour/condition valves shouldn't be a prob? Air cleaners are new. Injectors could well be a culprit as car basically sat for 4 months. Will be doing a plenum pull sooner than later to fix rocker cover leak & to do the tb water line bypass, perhaps the cut-off solenoid bypass too? Will go over lines bit more than I guess. Is it true the det sensor is inactive after 3500rpm anyway? Doesn't read past that?
Depends on the load as well as the revs. Its the lower left hand side of the map only. So low load and low rpm. So even at 2000rpm at max load the det sensor is not used.
Yes and forget relocating it. The CTS needs to be working or you will be in safty mode. Dont assume, go and check it.
