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| tjpreul | Heated o2 wiring | ||
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Elite Guru
 
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I put heated o2's in my '92. Now when I stop for gas it doesn't fire right up. It will fire then die. To get it to start I have had to feather the gas (not much). I have also tried push the pedal to the floor before turning the key.
I am wondering if I need to put a delay on the heater circuit. A separate relay was installed to run power to the o2's. It has only done this when there is already heat in the engine, not on the first start. When I turn the key I wait for the fuel pump to prime before I crank the engine. |
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Posted on: 2012/8/30 2:14
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| BillH | Re: Heated o2 wiring | ||
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The Stig Moderator
 
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Pushing the throttle to the floor does nada (as you probably found out).
Try pulling the relay when it's hot. How old is the IAC? |
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Posted on: 2012/8/30 13:28
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Every man dies but not every man lives. |
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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Quote:
I thought in a flooded condition you were to push the pedal to the floor then release before cranking the car. You can hear somethink click at half throttle then at full the first time depressed. I will try this weekend. I want to do some more tuning to the top end. Old, but I have another (older). |
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Posted on: 2012/8/30 17:50
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| BillH | Re: Heated o2 wiring | ||
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The Stig Moderator
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No, for a flooded situation, you hold the throttle open (don't release it) during cranking. Holding it totally open lets more air in to mix with too much fuel, releasing the throttle shuts off thet big volume of air and increases the richness of the mixture in intake (due to flooding). The "click" you'd have to have someone runs the pedal, stethoscope or screw driver in the ear at the TB or IAC. Or the ABS cable box. |
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Posted on: 2012/8/30 20:15
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Every man dies but not every man lives. |
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| Matatk | Re: Heated o2 wiring | ||
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Webmaster
 
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I doubt that is related to the 02 sensor. Sounds more fuel related to me.
As far as the flooded condition, when you hold the pedal down it sends a signal to the ecm via the TPS to kill the injectors. |
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Posted on: 2012/8/31 1:51
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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I have been able to start without touching the pedal. This was the only change that was made. When it does start the AFR is reading lean. The other day it had a puff of black smoke when it started. This is what is confusing.
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Posted on: 2012/8/31 2:08
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| Matatk | Re: Heated o2 wiring | ||
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Webmaster
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Are you still running that piggyback controller for the supercharger?
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Posted on: 2012/8/31 2:23
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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Yes. Since I corrected the MAP settings it has been good. The problem was the MAP setting is shown as RPM in the graph, so I didn't know the feilds were different. The start problem actually isn't too bad. It has only happened three times, but is annoying. |
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Posted on: 2012/8/31 2:31
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| Matatk | Re: Heated o2 wiring | ||
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I'm kind of stumped. Wonder if it's the sensor itself. Is it only lean on startup then runs fine?
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Posted on: 2012/8/31 2:32
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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Yes, once it starts the idle and drive is fine. I don't think my AFR is acurate as I put in a previous post. When I am cruising it stays between 14.9 and 15.3. It does have a heated wideband also, but isn't as close to the engine as I wanted it. However the piggyback still allows the factory ECM to use the o2's and adjust the fuel. |
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Posted on: 2012/8/31 2:41
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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I don't remember if I mentioned with the o2's unhooked I had the AFR reading 14.5 at idle (tuning with piggyback). Since they are hooked back up it stays around 15.4. This is why I know it is the factory ECM making the change.
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Posted on: 2012/8/31 2:45
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| vetteoz | Re: Heated o2 wiring | ||
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Senior Guru
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Quote:
Not the O2 sensors because there is a time delay ( 60-180 sec ) before the ECM looks for them come online and they affect the fueling |
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Posted on: 2012/8/31 5:50
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| Matatk | Re: Heated o2 wiring | ||
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Good to know - thanks! |
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Posted on: 2012/8/31 12:25
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| tjpreul | Re: Heated o2 wiring | ||
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Elite Guru
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Well that answer ruins my theory. I guess I will deal with it. My only other thought is since I have been driving it the fuel is now fresh. I may need to do a slight adjustment to the fuel. |
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Posted on: 2012/8/31 17:38
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