Injector difference? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-07-2007, 12:32 PM   #1
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Default Injector difference?

Injector difference?

What is the difference between the 95 injectors with 6 spray holes and the injectors with the plastic tip and 4 spray holes??
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Old 05-07-2007, 01:42 PM   #2
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None. They flow the same. Simply a different manufacturer. Bosch or Rochester. They are interchangeable (L36).
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Old 05-07-2007, 07:49 PM   #3
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Willwren
T hank you for the reply and information.

My fuel rail has a Bosch sticker and the regulator cap says Bosch and the injectors have 666 on them. Guess they are Bosch injectoes wish they said Busch instead.

Sounds like I need to try the Rochester 6 hole injectors.
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Old 05-07-2007, 08:42 PM   #4
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FIE has found no difference in flow, nor any advantage in spray pattern between the two.
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Old 05-13-2007, 12:27 AM   #5
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How many years did GM use Rochester Delphi injectors on L36 motors?
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Old 05-13-2007, 01:04 AM   #6
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Every year from 96 on. 95 was Bosch like previous years.
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Old 05-13-2007, 03:12 AM   #7
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Thanks Willwren

I did not know that the recalled fuel pressure regulators were Rochester.

Got hold of a Rochester fuel rail and injectors from a ? year Bonneville today.
The injectors and pressure regulator will not interchange between the Bosch and Rochester fuel rails.
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Old 05-13-2007, 10:45 AM   #8
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Then your mutant is a Regal.....or the other way around.

jr's3800 is running Rochester injectors in his 95 right now. Simnple direct swap.
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Old 05-13-2007, 03:01 PM   #9
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I was wrong.

Correction the clip that holds the injector to the rail will not interchange between the Bosch and Rochester railí* that I have. The clip has to match the fuel rail on these and the fuel pressure regulator looks to be completely different.


Bosch injector.



Rochester injector.
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