One issue with a digital display is the visual swing, it's a lot easier to see with an analog gauge. I've tried a fluke 123 scope to measure the signal but it was easier with a 1980s dwell meter.
Sent from my SM-N950F using Tapatalk
Location: Warwickshire UK
Posts: 14
My VIN: 10855
One issue with a digital display is the visual swing, it's a lot easier to see with an analog gauge. I've tried a fluke 123 scope to measure the signal but it was easier with a 1980s dwell meter.
Sent from my SM-N950F using Tapatalk
I better get with the program! I inherited this from my father, been using it for years now, mostly for older cars that don’t have a tach. Still use it, seems to work great so have never seen the need to buy a new one.
Tach-Dwell.jpg
Can you guess the vintage?
...
Keeper of the DeLorean Owners Directory, at www.DeloreanOwnersDirectory.net
Get the world's only DeLorean Mobile App Here
Posts: 33
Location: CLE/PHX
Posts: 2,592
My VIN: 5646,5080, 5880, 10234, 3639, 2518, 10586, 1538
To step in on this with knowledge on your car after servicing recently. Your car does not have an oxygen sensor in the custom exhaust or a working frequency valve circuit. You can still make a base CO adjustment with a wideband oxygen sensor but not with the method involving dwell on the lambda circuit.
www.deloreanindustries.com Every Detail Matters
Posts: 33
Thanks Josh! Yeah, I was just trying to understand how things work. So given my FV isn’t running, the fuel mix must be tuned richer to compensate - right? And because without a O2 sensor anyway, the fuel mixture would be a constant either way (Fv running at 50% vs Richer mix and no FV)
Am I understanding?
Location: CLE/PHX
Posts: 2,592
My VIN: 5646,5080, 5880, 10234, 3639, 2518, 10586, 1538
The fuel mixture is working off it's base curve without any type of dump from the valve. Essentially it just isn't looking for anything as it is mechanical and doesn't know any better aside from the warm up curve from the CPR. You can safely set this with a wideband and be good to go. The Lambda system isn't critical to the car. Your mpg will see negative results from this. Recommendation would be to set to 14.7 +/- .3 and be good to go. This was checked when we installed our braided fuel injection line kit procedure. Your adjustment was off due to the number of vacuum leaks on the intake system, pipe of agony leak, manifold issue at w pipe etc. Once all of those were corrected it was in the 14's.
www.deloreanindustries.com Every Detail Matters
Are the mixture values the same with an automatic, or should the dwell be adjusted either more rich or lean?
Yep - The spec is for stock, auto or manual.