[DeTomaso] Free Flow Exhaust Runs Hotter?

[Daniel C Jones]

> the engine is a good 10 degrees hotter with no changes to the car
> other than the new exhaust.  Also some popping and backfiring on
> off throttle declaration. Could this be a lean condition caused by
> the new exhaust?

Yes.

> Solutions?

Leaner mixture runs hotter unless timimg is advance to compensate.
If the engine has the correct mixture, try advancing the distributor
(either initial or vacuum if you have an adjustable vacuum can).
I'd also put a wideband O2 sensor on it to check the crusie and wide
open throttle mixture.

Dan Jones