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Print in friendly format Send this term to a friend  RPO
Regular Production Order. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.
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shmidtd 91 Misfiring
Guru Newb
Pisa, Italy
7 Posts
Member since:
2007/1/11 0:00



Offline
My 91 has developed a misfire and I believe it is fuel related. I've replaced the Cap, rotor, plugs and megg'd the wires. The injectors were replaced in 2001 with factory new ones but the car mainly sat. What is the name of and where might I get the fuel injection cleaner that connects to the fuel rail and you pull the fuel pump fuse, run the car until it quits and the injectors are clean?
Posted on: 2007/7/13 4:48
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PeteK RE:91 Misfiring
Moderator
Nanticoke, Pa
1311 Posts
Member since:
2006/7/3 0:00



Offline
Napa should have it. I use the Amsoil PI injector cleaner with excellent results. Every time I dissassemble an engine, I run some PI through the system first . Valves and ports are usually cleaned up nicely.
Posted on: 2007/7/13 12:06
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shmidtd RE:91 Misfiring
Guru Newb
Pisa, Italy
7 Posts
Member since:
2007/1/11 0:00



Offline
Thaks PeteK the Napa stuff did the trick!! :thumbright:
Posted on: 2007/7/15 1:37
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