I have 91 rs w/ the bc4 package. anyone know what works best as fuel inj. cleaner?
thx

 

Depends how you plan to clean them. If you just want a fuel additive to put in the tank, go to your local GM Dealer and ask for "Port Fuel Injection Cleaner". I'm sure others have there favorites, but I have tried others and nothing seems to work as well on GM Vortec Poppet nozzels as the GM cleaner, so I'm stuck on it.

If you are cleaning them at the rail (w/ the fuel tank isolated from the system) then regular gasoline w/ a 5% solution of GM Top Engine Cleaner is the best. The rail must be isolated from the tank though, because TEC will kill your pump, same w/ the injectors if you use too much. GM has concluded that 5% is OK to use on Multec injectors, and since they are both "wet" style injectors (windings are submerged in the fuel) I have had no problems using them on the Rochester injectors either. Remember, 5%.

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i use red line, it works very good.

 

This is probably more info than you were looking for but here are the results of some tests I did comparing different cleaners:

For my tests, I tried to use a wide variety of products, well known and unknown, expensive and cheap, and also some pure solvents in order to represent a good cross section of products on the market. Note, carbon itself (such as soot and other thermally decomposed material) is not soluble in ANY solvent but solvents like dimethylformamide and N-methyl pyrrolidone do a good job of breaking up clumps and dispersing the fine particles to release the heavy tarry materials trapped within them. However, some of these solvents are too harsh to use freely in the fuel system. (Someone in one of these forums told me that when the auto industry looks for good cleaners, they mostly look for solvents that will not attack the plastic and rubber parts in the system.)

Most cleaners (the safer & slightly less effective ones) usually have common solvents in them like toluene, alcohol, acetone or methyl ethyl ketone, and naphtha. If you want to use these to clean your system, you can get more for your money by buying the pure solvents at a hardware store and mixing them yourself. I have never had a problem adding toluene, acetone, alcohol, or naphtha to my gas tank in quantities up to one quart per 16 gallons.

Most of the straight solvents I used are at least as flammable as gasoline so be careful if you use them. The alcohol used was pure, 100% isopropyl alcohol. This has no water in it, it is not the same as "rubbing alcohol".

These test results are as fairly and accurately done as I could manage with the equipment I had available, and the other data presented is also accurate to my knowledge. Your car may have different plastics in it than mine does so if you choose to make your own cleaner, do it at your own risk.

TEST RESULTS
RELATIVE EFFICIENCIES AT WHICH VARIOUS CLEANERS WILL DISSOLVE HIGH BOILING RESIDUES FROM GASOLINE AND CARBONACEOUS DEPOSITS FOUND IN USED MOTOR OIL, (10=BEST):

· 10 Gunk Gas Treatment
· 10 Toluene (a common ingredient)
· 9 Castrol Syntec Power System
· 8 Duralube Fuel System Cleaner
· 7 Gunk Fuel Injector Cleaner
· 6 Redline SI-1
· 5 Gunk Air Intake Cleaner
· 4 Naphtha (a common ingredient)
· 4 STP Fuel System Cleaner
· 4 Seafoam Motor Tuneup
· 4 Trak Fuel Injector Cleaner
· 4 STP Intake Valve Cleaner
· 4 CD-2 Emission Cure
· 4 Prolong Fuel System Treatment
· 3 CD-2 Fuel Injector Cleaner
· 3 Techron Concentrate
· 0.5 Butyl Cellosolve (a COMMONLY used "AUTO INDUSTRY DETERGENT" for oil and grease)

THE FOLLOWING CLEANERS DO NOT HURT NYLON (LISTED RANDOMLY).
(The letters in parentheses indicate how well they dissolved the material from used oil, A=best.):

· Toluene (A)
· 2-Phenoxyethanol (A)
· Duralube Fuel System Treatment (B)
· B-12 Chemtool (B)
· Trak Fuel Injector Cleaner (C)
· Techron Concentrate (D)
· STP Intake Valve Cleaner (E)
· Seafoam Motor Tuneup
· CD-2 Emission Cure
· Prolong Fuel System Treatment
· Aromatic distillates
· Naphtha
· Butyl cellosolve
· Acetone

THE FOLLOWING CLEANERS WILL DECOMPOSE THE NYLON SOCK IN THE FUEL TANK. Listed in order of increasing severity:

· STP Fuel System Treatment
· CD-2 Fuel Injector Cleaner
· Gunk Fuel Injector Cleaner
· Castrol Syntec Power System
· Redline SI-1
· Gunk Gas Treatment
· Monoethanolamine
(The monoethanolamine is the worst here. It turns nylon black on contact. It is significant to note here that the "best" "detergents" in use today are similar, strongly alkaline organic solvents). Another use for the current bunch of organic amine "detergents" is cleaning deposits out of cylinders, so I hear.

 

Hey "fifaref" You have a 91 B4C thats sweet dude. I have never seen another 1991 or thirdgen B4C besides mine. Thats awsome. Have you done anything to it? Is is a 350 or 305. Do you have any pics?

James

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1991 Lust Red Camaro B4C
13.4 at 100mph
Cffb # 143
K&N air filter modified air box, Flowmaster cat-back, cut out, 4.11 gears, Carbon Fiber drive shaft,BFG's G-Force KDW's Tires =)and Nitto 555R Drag Radils, Crane Cams: Cam shaft, 1.5 Gold series roller rockers s/a, hardened pushrods, lifters, chain assembly, and valve springs,and custom JET Chip, A Yank 2,500-2,700 stall conv. .
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