Edelbrock 1902 Automobile Parts User Manual
Contents
1. 1902 1920 1903 1904 amp 1906 1921 Replacement Fuel Filters The Edelbrock Performer Replacement Series Carburetors for Q Jet applications has a replaceable fuel filter element behind the Fuel Inlet Nut Replacement filters are available as follows Carb s Fuel Filter 1901 amp 1902 1970 1903 1904 amp 1906 1971 Q JET CARBS WITH EGR VACUUM PORTS The original carb on some Chevy GMC trucks and Suburbans has the EGR vacuum port machined higher in the carb venturi than the Edelbrock Q Jet This may have an effect on off idle performance resulting in a flat spot If you get a flat spot off idle after installing the Edelbrock Q Jet carb you may need to install a vacuum delay valve A simple test will let you know if the delay valve is needed a Temporarily remove and plug the vacuum line to the EGR valve If the flat spot disappears you will need to purchase a vacuum delay valve GM 14020691 and install it in the vacuum line between the carb and the EGR valve This valve will delay the opening of the EGR valve long enough for the carburetor to transition through the off idle phase without a stumble then the EGR circuit will operate normally Note The vacuum line to the EGR valve should only be removed temporarily as a test to determine whether the delay valve is needed You must re install the vacuum line to the EGR valve in compliance with local and or federal law Rev 02 02 Z00 9 ON 91nu901g 20 20 A2. PERFORMER REPLACEMENT SERIES CARBURETORS FOR Q JET APPLICATIONS for non computer controlled Chevrolet GMC V8s 1966 89 CATALOG 1901 1902 1903 1904 amp 1906 INSTALLATION INSTRUCTIONS PLEASE study these instructions carefully before installing your new Carburetor If you have any questions or problems do not hesitate to contact our Technical Hotline at 1 800 416 8628 7 am 5 pm Monday Friday Pacific Standard Time or e mail us at edelbrock edelbrock com IMPORTANT INFORMATION ABOUT YOUR WARRANTY If you have any problems with installation or performance do not return to the retailer The retailer is not authorized to perform Warranty Service Instead call the Edelbrock Carb Tech Hotline at 800 416 8628 from 7am 5pm PST on weekdays All returns must be accompanied by the original purchase receipt The warranty period is 90 days for new carburetors and 30 days for as new remanufactured carburetors DESCRIPTION The Edelbrock Performer Replacement Series Carburetor for Q Jet applications is a high quality all new carburetor designed to gt replace the original equipment Q Jet spread bore carburetors found on most 1966 1989 non computer controlled Chevrolet GMC V8s These carburetors are street legal stock replacement parts when used on the applications for which they are listed Edelbrock replacement carbs for Q Jet applications are compatible with all OEM linkage and a components for the years listed and will fi
3. parts of the country the local fuel will be a winter blend that is very volatile as an assist to cold engine starting and driveability during warm up However the high volatility has the disadvantage of allowing excessive vaporization of the fuel if the vehicle is operated in a heated area such as a garage This can result in problems in the idle set procedures since the carburetor s internal vents will allow this excess vapor to be drawn into the throats and enrichen the mixture The idle will be erratic and not seem to be able to hold a set To resolve this problem it is advisable to perform the final settings outdoors after the vehicle has been stabilized with a drive of several miles FAST IDLE SOLENOID BRACKETS Your original Fast Idle Solenoid Bracket should mount to the Edelbrock Q Jet Series carburetor If a replacement bracket is desired use GM 7042682 for 1901 and 1902 Edelbrock 1997 is an adapter to connect a factory vacuum operated throttle kicker to carburetor 1903 1904 and 1906 CHOKE LINKAGE INSTALLATION The Edelbrock Performer Replacement Series Carburetors for Q Jet applications have three different types of chokes divorced remote hot air and electric Figure 3 shows typical divorced choke linkage used on 1901 and 1902 The metal housing which snaps in place over the choke coil on manifold has been left off to show choke rod coil relationship The metal housing should be installed on your engine as it reta
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6. N 1 Remove rag from intake manifold and install new mounting gasket NOTE Do not use any cement glue or liquid gasket 2 Carefully place new carburetor on gasket 3 Replace all mounting bolts nuts and washers Hand tighten with a short box end wrench using even increments alternating between diagonally opposed bolts Use stock mounting bolts or Edelbrock Q Jet Bolt Kit 1925 CAUTION Overtightening may break carb base 4 For models with externally mounted fuel filters install new fuel filter starting threads by hand to avoid crossing or stripping threads Replace any old or cracked hoses with new hoses designed for use with fuel 5 Hook up fuel line to fuel filter Start threads by hand NOTE Be sure threads are properly aligned before tightening to avoid crossing or stripping threads When tightening fuel line use two wrenches one to hold the fitting on the carburetor and the second to turn the fuel line fitting Use a tubing wrench to avoid rounding the tube fitting nut 6 Re connect throttle linkage wires hoses etc Your Edelbrock carburetor may have more vacuum outlets than the original Leave the caps on those outlets which won t be used NOTE 1901 and 1902 will accept the stock idle speed compensator bracket GM 7042682 7 Re connect the air cleaner being careful not to over tighten the mounting nut which could damage the carburetor Install a new air filter if needed and re connect all hoses IMPORTANT NOTE Wit
7. Screws IMS that provide a leaner Air Fuel A F ratio when turned clockwise and richer A F ratio when turned counterclockwise The idle air flow is controlled by a conventional screw that opens the primary throttles The following procedure should be used to set the idle mixture and speed Fully warm engine and ensure choke is fully open Install air cleaner Set desired speed with the air screw Adjust the IMS on one side to get the maximum possible rpm or highest vacuum if you are using a manifold vacuum gauge Do not go rich beyond the maximum speed point If the procedure above changed the idle speed more than 40 rpm then re adjust the idle speed Adjust the opposite side of that in Step 4 to get maximum rpm or vacuum Reset the speed Carefully trim each IMS to again get the maximum idle rpm or manifold vacuum Go leaner just enough to get a 20 rpm drop in speed Reset the speed to the desired rpm This is a Lean Best Idle Set Setting richer than this will not improve idle quality or performance but could cause higher hydrocarbon emissions and tend to foul spark plugs Emission legal carburetors 1903 1904 and 1906 are supplied with tamper resistant protective metal caps for idle mixture screw wells These covers should be installed following completion of final idle mixture adjustments NOTE Use idle mixture adjustment tool K amp D 2776 or equivalent WINTER FUEL IDLE SETS During the winter months in most
8. ages and return springs You may want to mark them with masking tape for easy reference Compare throttle arm of your new carburetor with the old one to be sure that all required linkages will hook up Ball stud is usually removable and must be installed in the proper location see Figures 1 amp 2 5 Disconnect all wires tubes and hoses from carburetor and note their location NOTE There should be a maximum of one wire to the electric choke and one to the idle compensator solenoid Any other electrical wiring attached to your carburetor indicates a computer k 2002 Edelbrock Corporation Page 1 of 4 Brochure No 63 0073 passenger car applications using a remote style choke 1966 to 1973 1902 750 cfm Recommended for most small block and big block Chevrolet GMC V8s 350 through 454 c i d in both truck and passenger car applications using a remote style choke 1974 to 1978 1903 795 cfm Recommended for most small block Chevrolet GMC V8s 305 through 454 c i d in both truck and passenger car applications using a hot air style choke 1975 to 1985 Electric choke conversion see choke linkage section 1904 795 cfm Recommended for most small block Chevrolet GMC V8s 305 through 350 c i d in truck applications only using a full electric choke 1980 to 1989 1906 795 cfm Recommended for big block Chevrolet GMC V8s 454 engines in truck applications only using a full electric choke 1980 to 1989 controlled en
9. gine and Edelbrock Q Jet carburetors will not function correctly on computer controlled applications Disconnect the heater tube from the choke housing 1903 only If the tube is burned out replace it Failure to do so will cause deposits to form inside the carburetor improper choke operation and void the warranty Carefully remove fuel line from carburetor or fuel filter TAKE EXTREME CARE NOT TO SPILL ANY EXCESS FUEL Place a rag Figure 1 underneath the fuel line to Throttle arm of 1901 absorb any spillage that may occur Certain models require two wrenches to remove the fuel line one to hold the fitting on the carburetor and the second to turn the fitting on the fuel line Use a tubing wrench to avoid rounding the tube fitting nut Figure 2 Throttle arm of 1902 1903 1904 amp 1906 Rev 02 02 7 Remove mounting nuts or bolts and or washers Be sure to put them where they won t fall into the intake manifold upon carburetor removal 8 Remove carburetor being careful not to spill any dirt into the intake manifold Immediately place a clean rag into the manifold to keep foreign objects out 9 Thoroughly remove old mounting gasket and clean mounting surface Inspect gasket and match to gasket included with new carburetor CARBURETOR PREPARATION 1 Place old and new carburetors side by side and transfer any accessories that are needed onto the new carburetor CARBURETOR INSTALLATIO
10. h engine off make sure that there is no interference when opening and closing the throttle Be sure that there is no binding or hanging up between idle and wide open throttle as this could cause the throttle to stick resulting in loss of engine speed control 8 Re connect the negative battery cable to the battery A Diverter Port B Choke Pull down C Fuel Inlet D Exhaust Gas Recirculation EGR Port E Idle Mixture Screws F Positive Crankcase Ventilation PCV Port G Canister Purge H Distributor Port Idle Speed Screw J Accessory Port Typical Rear View K Bowl Vent L Hot Air 1903 only M Fast Idle Screw N Clean Air 1903 only 0 1 4 N P T Power Brake Port 2002 Edelbrock Corporation Page 2 of 4 Rev 02 02 Brochure No 63 0073 ONS 2002 Edelbrock Corporation CARBURETOR TESTING Be wary of fuel leaks If a fuel leak occurs stop immediately and repair the leak Failure to do so could result in engine fire and serious injury NOTE The following adjustments can affect vehicle emissions Laws in your area may govern these emissions Set idle adjustments per factory recommendations for your vehicle The choke system is pre set at the factory However minor adjustments may be required Adjust using factory specifications for your vehicle IDLE MIXTURE ADJUSTMENT The Edelbrock Performer Replacement Series Carburetor for Q Jet applications has conventional Idle Mixture
11. ins the choke rod in the coil Stock manifolds can use original equipment choke Brochure No 63 0073 parts and Edelbrock makes choke linkage kits for use with Performer manifolds Use Choke Kit 1931 for small block Chevy Performers with divorced choke carbs 1901 amp 1902 use Choke Kit 1935 for big block Chevy Performers with divorced choke carbs 1901 amp 1902 Figure 4 shows typical hot air choke connections as used on carburetor 1903 Stock manifolds can use original equipment choke parts and Edelbrock makes choke linkage kits for use with Performer manifolds Use Choke Kit 1930 for small block Chevy Performers with hot air choke carb 1903 use Choke Kit 1934 for big block Chevy Performers with hot air choke carb 1903 Some OE Q Jet carbs with hot air chokes use a screw on nut located at the rear of the choke housing For these applications we recommend the use of the Edelbrock 1932 Some models use auxiliary vacuum diaphragm on the passenger side rear of carb remove the diaphragm and install on the Edelbrock carb Electric choke carburetor 1904 and 1906 require a 12 volt lead that is hot only when the ignition is on Page 3 of 4 Figure 4 Hot air choke 1903 Figure 3 Divorced choke 1901 and 1902 Edelbrock Q Jet Rebuild Kits The Edelbrock Performer Replacement Series Carburetors for Q Jet applications can be rebuilt with the following rebuild kits Carb s Rebuild Kit 1901 amp
12. t stock intake manifolds For best performance they may be used with the matching Performer or Performer EGR intake manifold for those who wish to use a new 4 stock replacement carburetor Five models are available for the following applications 5 1 1901 750 cfm Recommended for most small block and big block Chevrolet GMC V8s 327 through 454 c i d in both truck and BEFORE YOU BEGIN ALWAYS REMEMBER TO Q Replace fuel filter Dirt found in carburetor voids warranty Q Check and replace the air filter if necessary Q Check PCV valve and replace if clogged Q Check all hoses for leaks or cracks and replace if necessary Q Check fuel pump for proper operation and replace if necessary Q Check the intake manifold and cylinder head gaskets for leaks and replace if necessary Q Check the ignition system clean and gap or replace spark plugs plug wires and adjust ignition timing 6 CARBURETOR REMOVAL Prior to removal make sure that the engine is cool 2 Disconnect negative battery cable from battery 3 Remove air cleaner Be sure to carefully disconnect any hoses from the air cleaner and note their location for re installation You may want to mark them with masking tape for easy reference 4 Disconnect throttle linkage kickdown linkage certain automatic transmission applications only cruise control if equipped and any return springs if present NOTE Check carefully for the precise location of all these link
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