Question about 1996 Chevrolet C/K 2500
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Posted on Jan 02, 2017
replace ignition coil make sure by dealer the right mode is used when ordering if not ordered right you will get a difference in engine volts
Posted on Jun 07, 2008
I've got a Wrangler with a 4.0L that was doing the same thing. On mine it turned out to be the injectors were getting gummed up.
You can try the additives they sell but I've never really seen them make a difference. Maybe I like immediate results.
If you decide to clean them yourself, comment back. There are some precautions you need to be aware of and some parts you will need in advance.
Posted on Nov 11, 2009
Testimonial: "Thanks for the input Mike. I'll try cleaning the injectors. "
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May 16, 2017 | Cars & Trucks
on Dec 20, 2016 | Cars & Trucks
Apr 03, 2015 | 1999 BMW 323i
Apr 01, 2017 | 1996 Cadillac Eldorado
Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor
The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:
Ignition timing advance Fuel injection pulse-width Idle (learned value or minimum TPS) Off-idle (0.06 volt) Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage) Deceleration fuel lean out Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage) A/C WOT cutoff (certain automatic transmissions only)
Removal & Installation
3.7L & 4.0L
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The electrical connector to the IACV
can have 2 or 4 pins:-
pins: resistance between pins should about 10 OHMS +/- 3 OHMS. Resistance between either of the pins and the
valve body is greater than 10,000 OHMS
pins: resistance between diagonally positioned pins should be about 20 OHMS
How to fix? If the motor of the IACV has failed then replace it. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IACV look blocked again clean them out thoroughly
3) Throttle Position Sensor TPS - How to check? The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open. What is looked for is smooth voltage increase with throttle change. If there are drop outs in the transition or that there is no transition seen the TPS is faulty.
How to fix? If the track is dirty
causing drop outs, try cleaning it with residue-free electrical cleaning spray.
If the track is worn it is perhaps easiest to replace the complete device.
In some instances it may be possible to adjust the location of the central
mount of the TPS contact arm along the throttle shaft by a few millimeters and
in the process cause a fresh concentric region of
4) Fuel pressure regulator _ Yes I know you have checked it for pressure but at start up when the ignition is at position 2 the fuel pump starts up and pressurizes the fuel rail. As you turn to position 3 "ignition" power is cut to the pump and fuel pressure is maintained by a non-return valve in the pump. If that valve is faulty the fuel pressure in the rail will drop to zero just when you need it and no fuel can be injected. Check the fuel pressure when at position 2 and then switched off; fuel pressure should be maintained for up to 5 minutes with little or no loss. If there is pressure loss then either the non-return valve is faulty or you have leak in the fuel pressure regulator. If it is such a leak, fuel will dribble from the vacuum line connected to it when disconnected.
Nov 25, 2010 | 2000 Chevrolet Tahoe
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