1993 Chevrolet Silverado rebuilding TBI injection

JASONPYZO

MEMBER
1993 CHEVROLET SILVERADO
5.7L
V8
2WD
AUTOMATIC
158,542 MILES

I was wondering if it's a good idea to replace the 2 injectors in the throttle body when doing an overhaul on it, just because of the age of the truck?

Saturday, August 2nd, 2014 AT 4:23 PM

3 Replies

FREEMBA

MECHANIC
1,152 POSTS

It's not a bad idea. Since there's no way of predicting when an injector may go bad, this may spare you from having to deal with it later.

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Saturday, August 2nd, 2014 AT 5:47 PM

JASONPYZO

MEMBER
87 POSTS

Ok thanks, I got one more question if you don't mind. I heard that it might be a good idea to put in an adjustable fuel pressure regulator because the factory one has the leeway of 9-13 PSI and they say it should be 13 PSI, what's your thoughts on that?

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Saturday, August 2nd, 2014 AT 7:41 PM

FREEMBA

MECHANIC
1,152 POSTS

That's not a bad idea, but keep in mind that the factory one adjusts itself according to engine vacuum.
At times of low vacuum (under load, accelerating, etc.) Fuel pressure increases, providing a rich mixture [for more power].
At times of high vacuum (cruising) fuel pressure decreases, providing a modest amount of fuel
to increase fuel mileage.

I've seen the adjustable types work well in daily use vehicles but there was no distinct advantage over the factory type.

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Sunday, August 3rd, 2014 AT 6:03 PM