Massive break up

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Aug 28, 2021 | 11:16 PM

Noah12127

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2nd Gear

Joined: Aug 2021

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Massive break up

I have a 1990 base model auto. I am having a massive break up when I give it gas. I’ve replaced spark plugs and wires, distributor cap and rotor. I’ve replaced the fuel filter. The fuel rail gets 41 psi. My thought now is maybe injectors? It idles great and can rev up in park with light throttle. But full throttle breaks up.

Aug 29, 2021 | 03:58 AM

Natty C

Melting Slicks

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From: Mid-Atlantic

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Probably. Check em and see.

Maybe give the fuel pressure regulator a look, too. But you have to pull the plenum and if you go that far, you may as well swap it out anyway.

Here's what the fpr looked like on my '90 when I yanked it...

Last edited by Natty C; Aug 29, 2021 at 04:02 AM.

Aug 29, 2021 | 05:56 PM

Noah12127

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2nd Gear

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Thank you I will just go ahead and replace that.

Aug 30, 2021 | 06:56 AM

ThatOneKid

Racer

Joined: Feb 2020

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From: Fairfax, Virginia

Is that 41 PSI there when you give it gas or only idle. Injectors would cause issues at idle as well, this sounds like textbook fuel system restiction/failing FPR.

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