Tstat override

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Aug 30, 2019 | 04:26 PM

#16

branbock

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Queso.... Just got it up to running temp in the garage. Serious burning eyes trying it in my garage, never had a problem before! Never got past 11.0 on the wideband always rich. down to about 8 when wot. have some weird cap offs in the engine compartment. like the tstat bypass hose has been replaced with a sending unit for the apiller gauge... and the throttle body warming hoses have been removed or capped (dont matter i'm in AZ). but gunna get rid of the tstat bypass. found a leaking rear caliper when was about to back it out in the driveway too, could've been tragic!

oh... fuel psi was always about 42.
and tstat opened at about 190. so good there

Aug 30, 2019 | 04:30 PM

#17

rla2005

Fleet Owner

Joined: Oct 2005

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From: Kentucky

Quote:

Originally Posted by branbock

oh... fuel psi was always about 42.

That's bad. Should be ~30-35 PSI at idle with the vacuum hose attached to the regulator. Definitely a contributor to your rich condition.

Aug 30, 2019 | 04:33 PM

#18

branbock

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Quote:

Originally Posted by rla2005

That's bad. Should be ~30-35 PSI at idle with the vacuum hose attached to the regulator. Definitely a contributor to your rich condition.

It was always abut 42, wot or idle. gunna check that next, THANK YOU! wouldve thought that was good too have a constant.

do you know what vacuum is supposed to be?

Aug 30, 2019 | 04:50 PM

#19

rla2005

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From: Kentucky

Quote:

Originally Posted by branbock

do you know what vacuum is supposed to be?

Whatever the manifold vacuum is. Stock vehicles tend to run 15-20 in.-Hg at sea level at idle. As the throttle opens it goes down. at WOT throttle I would expect 0 in.-Hg. The lower the vacuum, represents engine load, the higher the fuel pressure goes.Stock V8 regulators are limited to ~42-45 PSI.