Chevy Impala Tuned Port Injection - Super Chevy Magazine

Chevy Impala Tuned Port Injection Fuel Valves

Big cars have always been fun cruisers. There was even a time when big-horsepower classics were the norm, boasting such powerplants as 409, 396, 427, 454! And true to form, the last of the breed even got the potent Corvette LT1 stuffed beneath its long bonnet. While most might aspire to own one of these brawny behemoths, the more plentiful underpowered big boat cruisers can be just as much of a cherished ride, and maybe more so when you transplant late-model technology.

GM Tpi Trouble Codes Code Description
13 Oxygen Sensor Voltage / ECU
14 Coolant Sensor Voltage (HIGH)
15 Coolant Sensor Voltage (LOW)
16 Excess Charging System Voltage
21 Throttle Position Sensor Voltage (HIGH)
22 Throttle Position Sensor Voltage (LOW)
23 Manifold Air Temp Sensor Voltage (HIGH)
24 Vehicle Speed Sensor - Error
25 Manifold Air Temp Sensor Voltage (HIGH)
32 EGR System - Error
33 MAP Sensor Voltage (HIGH)
34 MAP Sensor Voltage (LOW)
35 Idle Speed (HIGH/LOW) or IAC - Error
41 MEM-CAL/PROM Select - Error
42 Electronic Timing Control - Error
43 Detonation Sensor - Error
44 Oxygen Sensor / Lean Exhaust
45 Oxygen Sensor / Rich Exhaust
51 PROM - Error
52 CALPAK - Error
53 (HIGH) System Voltage
54 Fuel Pump Voltage (LOW)
55 Replace ECU - Defective
58 VAT - Error
61 Fouled Oxygen Sensor
62 Oil Temp Sensor Voltage (HIGH)

One of the first tasks of the Street & Performance crew was to remove the old fuel tank and install a new stainless steel tank from Rock Valley. The Rock Valley tank came with a high-pressure fuel pump already installed. In order to keep the stock gauges, a GM 0 to 90 Ohm sending unit for the gas gauge was also ordered from Rock Valley. If a Stewart Warner gauge is to be used ,a 240-33 Ohm sending unit is required, a VDO gauge will need a 10-180 Ohm sending unit, Ford or Mopar will use a 73-10 Ohm sending unit and the '31 to '54 Chevy will use a 0-30 Ohm sending unit, all of which are available from Rock Valley. These units are used in 6- to 24-inch deep tanks and operate on 6- or 12-volt systems. The installation requires connecting together the gauge, fuel pump and ground pigtails to make the connections easier after the tank is set into place. Note: Street & Performance uses color-coded wires to insure the proper connections.
One of the first tasks of the Street & Performance crew was to remove the old fuel tank an
This '66 Impala, owned by Tom Stotts of Mena, Arkansas, is a perfect example. After installing a fuel injected LT1 into his '57 Chevy, Tom decided that he wanted to add a TPI system to his rebuilt 350 with a 700R4 to get the startablity, performance and fuel economy that the tuned port setup offers. Tom took his Impala to Street & Performance where the experts there helped him modernize the big Super Sport. This was the final step that effectively completed a 2-year make over.
This '66 Impala, owned by Tom Stotts of Mena, Arkansas, is a perfect example. After instal
When installing the 1/4-inch pipe to 90 AN-6 fittings it's important to use Teflon tape on the threads, being careful not to get any tape into the tank or into the fitting. This installation included the use of braided stainless steel lines that went from the tank to the hard fuel line forward of the rear differential. These lines are now available from Street & Performance. It is a good practice when installing any fuel lines or fittings to flush the system and use oil on the threads of the fittings to provide a good seal.
When installing the 1/4-inch pipe to 90 AN-6 fittings it's important to use Teflon tape on

A stainless steel GM fuel filter kit from S&P was installed in front of the tank. The filter comes with 16mm O-ring to AN-6 fittings and mounting bracket. The filter is connected to the stock fuel line with a stainless nut and sleeve with flare to stock line.
A stainless steel GM fuel filter kit from S&P was installed in front of the tank. The filt
A flexible braided line is used to route the fuel over the differential to the new stainless hard line, forward of the rearend. A stainless AN-6 compression to male AN-6 fitting was used to connect the hard line to the braided hose. Once again, oil was used on all the connections.
A flexible braided line is used to route the fuel over the differential to the new stainle
Since the fuel pump was in the tank, we removed the manual pump from the engine and installed an S&P chrome fuel pump block-off plate. The ground wire was attached to the block at the fuel pump boss. With fuel injection systems, grounds are one of the most common problems. You must have a good clean ground from the battery to the engine, engine to frame, and engine to body, or problems are sure to crop up.
Since the fuel pump was in the tank, we removed the manual pump from the engine and instal

At this point, the old intake system was removed and the gasket surfaces were scraped and cleaned with lacquer thinner, then a 1/2 to 5/8 inch tall bead of silicone was applied to the manifold end mating surfaces of the block. Finally, a thin layer of silicone was applied around the water passage openings of the heads.
At this point, the old intake system was removed and the gasket surfaces were scraped and
The stainless steel straps that came with the tank were tightened to keep it in place. Next, the 3/8-inch stainless steel feed line provided by Tube Tech was installed. In this case the Impala's original steel fuel line was used as the return line.
The stainless steel straps that came with the tank were tightened to keep it in place. Nex
While waiting for the silicone to get tacky, the oil pressure tree from S&P was installed. This connector allows the use of a sensor for your dash gauges and the GM sensor for the fuel system. After the silicone became tacky, the intake was put into position.
While waiting for the silicone to get tacky, the oil pressure tree from S&P was installed.

With the manifold in place, liquid Teflon was applied to all the intake manifold bolts and they were torqued to 18 ft-lb in the correct sequence.
With the manifold in place, liquid Teflon was applied to all the intake manifold bolts and
With the plenum and throttle body in place, a Lokar aluminum throttle bracket was installed. The inlet fuel line connection was made at the rear of the fuel rail and the return line connects to the regulator. Also note that the MAP sensor is mounted in this area so that the distributor cap cover will cover it. The MAP sensor must be on a separate vacuum line.
With the plenum and throttle body in place, a Lokar aluminum throttle bracket was installe
After the manifold was tightened down we installed an electronic distributor and a set of Taylor Spiro Pro 8mm spark plug wires. At this point the intake runners were installed. The passenger-side tube has a taper on the top front and the driver side tube is level across the top. We also installed an S&P 360/10-degree O-ring swivel water neck with a 195-degree thermostat. This water neck will fit under the throttle body and allow you to position the upper radiator hose where needed.
After the manifold was tightened down we installed an electronic distributor and a set of

Since this car will be driven in cold weather, we hooked the bypass hose from the intake to the idle speed motor housing located under the throttle body. Then the heater hose was attached to the outlet on the passenger side of the idle speed motor housing. This will help to prevent the throttle body from icing up in severe cold weather driving. With the coolant system completed, the Lokar throttle and detent cables were installed. It's important to make sure that you check for clearance of the throttle arm and binding of any cables. When all connections are made, you should check that the throttle arm will return freely to idle position. This practice should also be used when any interior work is performed.
Since this car will be driven in cold weather, we hooked the bypass hose from the intake t
A steel O2 bung from S&P is welded into the exhaust system. (Only one is needed with a TPI system). If you have full-length headers, you will need to use heated O2 sensors. With a short headers or if you weld the bung close to the stock manifold you can use a one-wire O2.
A steel O2 bung from S&P is welded into the exhaust system. (Only one is needed with a TPI
This car received an S&P PN 1227727 computer, which is heat and weather resistant. An updated version of this computer is the PN 16198260. If you would like to install the computer inside the vehicle you can use PN 1227730, 16196344, 16198262 or the updated 88899196. The, a custom programmed chip from S&P was installed to match the engine, cam and transmission setup which is under the computer's lid.
This car received an S&P PN 1227727 computer, which is heat and weather resistant. An upda

A Lokar throttle, emergency brake and dimmer switch pedal covers for a '69 Camaro were used in this Impala. Only one hole had to be drilled to mount the gas pedal and then the factory pedal ball studs were removed from the floorboard. The brake pedal used a Lokar '55 Chevy power brake cover with slight modification.
A Lokar throttle, emergency brake and dimmer switch pedal covers for a '69 Camaro were use
An S&P polished air foil was added to improve the airflow through the throttle body, which is proven to provide up to 15 more horsepower on a mild 350 engine.
An S&P polished air foil was added to improve the airflow through the throttle body, which
After installing the S&P TPI design chrome valve covers on, the PCV valve stainless steel hardline from the S&P aluminum PCV valve to the vacuum port on the intake was routed between the driver side runners. If you have power brakes, the booster vacuum line should be connected to the vacuum port on the driver side rear of the plenum and any other vacuum can be connected to this line.
After installing the S&P TPI design chrome valve covers on, the PCV valve stainless steel

The throttle position sensor was adjusted from .54 VDC to .60VDC closed, and 4.5 to 5.0 VDC at wide open throttle. Higher horsepower engines can have the TPS set up to 8.4 VDC. S&P provides a harness that will allow you to use a digital voltmeter to do the job. (If you have a scanner, use VIN 1G2FS2389NL200001 (92 IROC/TA), and by turning the key to the on position you can set the TPS before starting.)
The throttle position sensor was adjusted from .54 VDC to .60VDC closed, and 4.5 to 5.0 VD
Installing an S&P liquid-filled fuel pressure gauge is the best way to monitor your fuel pressure at startup and throughout the life of the system. The liquid in the gauge absorbs the shock of the needle, which provides it a longer life. The gauge should read 38 to 40 pounds at idle and 45 to 48 pounds at open throttle. A liquid filled gauge will usually read about 2 pounds less.
Installing an S&P liquid-filled fuel pressure gauge is the best way to monitor your fuel p
A. S&P Liquid filled fuel pressure gauge (85 to 89 uses a long stem 90 to 92 uses a short stem) B. TPI O-ring to AN6 fuel line adaptors (85 to 88 Vette and 85 to 92 Camaro uses a 16mm and 14mm. 89 to 91 Vette uses two 16mm to AN6. The 16mm adaptors are also used for the GM/AC DELCO GF481 fuel filter. 16mm o-ring fittings will also fit the pressure side of the GM/Saginaw power steering pumps.) C. Adjustable fuel pressure regulator.
A. S&P Liquid filled fuel pressure gauge (85 to 89 uses a long stem 90 to 92 uses a short

Another good tool to troubleshoot problems is a noid light, which is used to show that the injectors are pulsing. The Snap-On Blue Point (PN FID8339). A 12-volt test light can also be used by inserting a paper clip into one side of the injector plug and the test light into the other.
Another good tool to troubleshoot problems is a noid light, which is used to show that the
The EST bypass disconnect link on the brown wire located by the distributor must be disconnected while setting the timing. Start by setting the base timing at 6 to 8 degrees. Then turn the engine off and reconnect the ESP bypass. The timing should now be 16 to 22 degrees at idle with a slight variation.
The EST bypass disconnect link on the brown wire located by the distributor must be discon
Once all throttle connections are completed we checked to be sure that the throttle would work freely before driving the vehicle. At this time it is also good to turn the key on and let the fuel pump pressurize the system. A check of the entire fuel system for any leaks was done before anyone got in for a lap around the block. But once that was complete and A-okay, our big car cruiser was ready to go. And go she did! And a whole lot smoother and more powerful than that old carb-fed mini-Mouse. What a fun (and easily accomplished) reincarnation this big car turned out to be.
Once all throttle connections are completed we checked to be sure that the throttle would

S&P Chromex coated type III Headers with bolts and gaskets
The vehicle speed sensor would not clear the cross member so an 8-inch cable was used to connect the vehicle speed sensor to the transmission.
The vehicle speed sensor would not clear the cross member so an 8-inch cable was used to c
A. 4000-plus manual vehicle speed sensor needed when using a manual speedometer. B. S&P jumper harness for setting throttle position sensor.
A. 4000-plus manual vehicle speed sensor needed when using a manual speedometer. B. S&P ju

S&P wiring harness for the 1227727, 16198260 Waterproof - Heat Resistant Computer.
S&P wiring harness for the 1227730, 16198262, 88899196, or 16196344 computers.
TPI Speed Density Computers 1. 1227730, 16198262, 88899196, or 16196344 2. 1227727, 16198260 Waterproof - Heat Resistant Computer 3. S&P Custom Chip On custom chips please specify cubic inches, cam specs, injector #'s, type of transmission, rear gears, tire diameter, and type of vehicle.
TPI Speed Density Computers 1. 1227730, 16198262, 88899196, or 16196344 2. 1227727, 161982

SOURCES
Lokar Performance Products 10924 Murdock Dr. Knoxville TN 37932 8-65/-966-2269 www.lokar.com	Stealth Conversions P.O. Box 11411 Pleasanton CA 94588
Rock Valley 800-344-1934 www.rockvalleyantiqueautoparts.c om	Tube Tech N/A
Street & Performance 479-394-5711 www.hotrodlane.cc