Lets go back to the Fuel pump. If you have a harness from the older square body truck there are very few connections with the main harness. One note here is that if you plan on using the tbi on your 1986 and earlier heads, the two center bolts on each side of the tbi manifold 4 total will have to be machined angle to match the earlier heads. Will let you know the results. Sorry this is the answer, but that is from my 35+ years experience in trans. No two sensors are ever exactly the same. In particular, the observation about tapping on the injectors does not sound right.
I don't remember that being the case but hey. You could pull from donor but a new one is cheap. I had originally run the diagnostics and there were no error codes but failed to add that to my post. I have pretty much covered everything I think. I understand so far that shorts to ground and loss of or incorrect vital input signals can cause this. Alright guys I have one for you! If you need to run emissions.
I guess I was just using misleading terminology when it comes to the fuel injector circuit. Hopefully this will never be an issue but would be nice to know. The transmission types available for this engine are 4L60, 4L60-E, and manual transmissions. Those wiring defects will send the signal voltage to 0. Just got back to it since I have been off-on this for a friend. Pressure regulator compensates for engine load by increasing fuel pressure when low manifold vacuum is experienced. Truck suddenly would not start this morning.
If you provide the bulb and the ignition on power to the bulb, this wire will activate the bulb flashing for trouble codes. I notice that the ground side ecu of the fuel injector circuit is not operating. I have a 89 C1500 stepside single cab 5. The answer is to remove and replace all the seals inside the transmission. Fuel pump relay From donor vehicle with the harness. Carbs could be set up to run lean. I am going to post what my findings are in my application.
As a back-up system to fuel pump relay, the oil pressure switch also activates fuel pump. For the record, and since it might be relevant in your case. I wanted to provide as much info as possible. No obligation at all but if you want to toss a little my way. If you are looking for diagrams for C100, the bulkhead connector on the driver's firewall, I can obtain them. Eventually turned distributor and now have spark at plugs but no fuel. The truck will be used for some heavy hauling where overdrive may not be usable.
Has a number like 1227747 is used here. Have you hooked up a fuel pressure gauge to check what pressure you have? Alright, I have a question for you guys, I have a 1993 Chevrolet C3500. At wide open throttle when vacuum is at its lowest , return orifice is restricted, providing maximum fuel volume and maintaining constant fuel pressure to injectors. I cannot find one in the chassis electrical diagram though. . Checked for all good grounds, and changed the starter wire. No apparent vacuum leaks, battery and alternator good.
I have a pressure regulator with a return running from the fuel lines so I am getting correct pressure I just cannot keep the fuel pump running. I have had some issues with the checkout process on ordering page. Thank you for this information I will verify if this is happening or not if possible before I move on. Replaced distributor cap and rotor but not working. In the next generation trucks the harness is routed under the heater box on the passenger side. Must be mounted in flowing coolant near thermostat. Presently I can pour gasoline in the carburetor and the engine wants to start so it is a fuel issue at this time.
There's no use for a pressure reading for anything other than the gauge. When was the last time the fuel filter usually mounted on the inside of the driver's side frame rail was changed? There is no connector where the harness passes through the firewall. They still suffer from the same mixture distribution problems as a carburetor, because of the wet manifold design, but since the mixture is very closely controlled by the ecm, the calibrated fuel requirements can be adjusted much more rapidly and with greater precision than ever could be achieved by an carburetor. There is an adjustment screw inside which is held in place with a large spot of solder. This connector is right under the middle of the dash. On the no voltage to starter thing, do a search of threads, good info. There is also two pulses for each injector per engine revolution so the correct mixture is present when the intake valve opens.
After all that it still only runs for five minutes or so then turns off and will not fire back up. More Detailed wiring information at this link: 4. Many are discovering the tbi is a cheaper alternative to the more exotic tuned port, readily available, easy to install, and the same brackets and accessories originally on their vehicles can be maintained. Some years have a narrow, rectangular pass through connector and some I believe the later years use a larger squared part. The other five percent are caused by loss of spark, or loss of injector pulses, or a non-running fuel pump.
Also be sure to connect a Ground Strap not included from the Negative Battery Terminal to the Vehicle's Frame, a Ground Strap from the Vehicle's Frame to the Engine, and a Ground Strap from the Engine to the Vehicle's Body. Motor fires over with starter fluid. If fuel pump relay fails, the oil pressure switch closes when oil pressure is obtained, and operates the fuel pump. Looking at the 1980's diagram I found showing all three clusters, looks like all the wiring is in the connector, just change clusters and make sure to have the right switches or sensors for oil pressure and coolant temp. During periods of high manifold vacuum, regulator-to-fuel tank return orifice is fully open, keeping fuel pressure on the low side of its regulated range. I would appreciate anyone's time. It will start and run for about twenty to thirty seconds before the fuel pump kicks off.