1985 camaro 2.8 v.6

[ron]

:'(Ive changed regulator on fuel rail new sending unit in tank line are clear. get fuel fine to engine compartment . but no pressure after that. havnt checked to see if fuel pressure drops only when crankin moter. hand to hold fuel ine in can while turnin over ! lol injector have all been volt checked and all good. not sure which relay is the fuel one? cant afford to replace all of them. tries to start when ya first crank over but then loses pressur on the rail. Any ideas whould be appreciated. I really need to get running., already lost job because of no transportation....THANX GUYS

[DanD]

The only thing I can think of is to get a fuel pressure gauge connected to the rail and see what the pumps actual pressure is. After you have this for us we might be of more help.
If you could try and explain with a little more detail of the problem and what you have tried may also help us understand what’s going on.
Dan.

[ron]

Well dan.... Checked fuel pressure good to go there. Fuel up and good while cranking over. Everything is new in fuel system. Pump, regulator,filter..ect. Loss of fuel pressure after first try. Turn key on first time, pressure good. Trys to start then nothin. Go under hood and check pressure and there is none. Wait for while turn key on and have pressure. Trys to start then same thing again. Could mass sensor or something be causeing comp to act up? . I dont know squat about fuel injection,and I'm limited on electrical. Hell ! If it was'not made in the 70's or below forget it for me ! lol. appreciate any help with problem ...Thanx Guys.

[oldtimer5520]

Hi Ron,
Came into this post late, Am not sure you said you had spark to plugs. All I saw was fuel checking. If there is no spark the fuel pump relay will turn off and there will be no fuel delivery.

[ron]

Yup good spark. new pickup coil, plugs, ect all checked out. Thanx any other ideas..? Thanx . Ron

[DanD]

I think oldtimer5520 is on the right track, that for some reason the computer is not authorizing the fuel pump to run after the prime cycle.
Try connecting a test light to the tan/white wire at the fuel pump relay and ground, turn the key on. The test light should light for a couple of seconds and then go out that’s the prime cycle.
Leave the test light connected and crank the engine the test light should come back on and stay on while you’re cranking and eventually start.
If you can check this and let us know the results, then we can go to the next step.
The fuel pump relay should be on the firewall near the power brake booster.
Dan.

[oldtimer5520]

Hi Ron & DanD,

Can’t remember for sure what year the Camero’s had all the trouble with the mass airflow sensor but I thought it was in 85. Engine would have spark and fuel when turning over but the air flow sensor would indicate to the ecm a problem. Here is some info that I found and may be worth checking into. Got this from Auto Zone Site

System Descriptions
GM Camaro 1982-1992 Repair Guide


The Multi-Port Fuel Injection (MPFI or MFI) systems were first introduced on the 1985 models. They may be called different names (Port Fuel Injection-PFI, Tuned Port Injection-TPI, Sequential Fuel Injection-SFI), however, all of the systems are similar in operation.
The systems are controlled by an Electronic Control Module (ECM) which monitors the engine operations and generates output signals to provide the correct air/fuel mixture, ignition timing and idle speed. Input information to the ECM is provided by the oxygen sensor, temperature sensors, detonation sensor, mass air flow sensor and throttle position sensor. A system may use all or some of these sensors, depending on the year and engine application. The ECM also receives information concerning engine rpm, road speed, transmission gear position, power steering and air conditioning status.
All of the systems use multiple injectors, aimed at the intake valve at each intake port, rather than the centrally located injector(s) found on the earlier Throttle Body Injection (TBI) and Crossfire Injection systems. The injectors are mounted on a fuel rail and are activated by a signal from the electronic control module. The injector is a solenoid-operated valve which remains open depending on the width of the electronic pulses (length of the signal) from the ECM; the longer the open time, the more fuel is injected. In this manner, the air/fuel mixture can be precisely controlled for maximum performance with minimum emissions.
There are two different types of fuel management systems used on the multi-port fuel injection engines. The mass air flow system and the speed density system.
The mass air flow systems measure the mass of air that is drawn into the engine cylinders, rather than just the volume. The sensor contains a hot-wire sensing unit, which is made up of an electronic balanced bridge network. Whenever current is supplied to the sensor, the bridge is energized and the sensing hot-wire is heated. As the air enters the mass air flow sensor, it passes over and cools the hot wire. When the hot wire is cooled, it's resistance changes and additional current is needed to keep the bridge network balanced. This increase in current is sent to the computer as a voltage signal and is used to calculate the mass of the incoming air. The ECM uses this information to determine the duration of fuel injection pulse, ignition timing and EGR operation.
The speed density systems calculate the volume of air moving through the intake. The ECM establishes the speed factor through a signal from the ignition module. The Manifold or Intake Air Temperature (MAT/IAT) and the Engine Coolant Temperature (ECT) sensors work together to assure that proper temperature information gets to the ECM while the Manifold Absolute Pressure (MAP) sensor monitors the changes in manifold pressure which results from changes in engine loading. These three sensors contribute to the density factor. Together, these inputs (engine speed, coolant temperature sensor, etc ...) are the major determinants of the air/fuel mixture delivered by the fuel injection system

Hope this is of some help.

[way2old]

Like I said oldtimer, glad to have you aboard!!!

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