Question about Pontiac Firebird

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I have a 1986 Firebird 2.8 V-6 which is getting fuel to the fuel rail(lots of pressure). I have checked and cleaned each injector on the bench and they work great but when in car, zero fuel. I checked voltage to each injector and they have 16-17 volts on all wires. How can the injector work if one is not negative? I have replaced the engine control computer with no help. What can I do now?

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Did you check the inj1 and inj2 fuses?

Posted on Dec 30, 2010


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I just changed the fuel pump in a 1990 firebird. There is still no fuel to the fuel injector

Check fuel pressure at the rail. If it's not within specs, check the pressure relief valve on the fuel rail - the one that feeds fuel back to the tank.

If the pressure IS within specs, it's time to start seriously suspecting the car's computer.

Aug 04, 2014 | Cars & Trucks

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I have a 2001 Mazda protege. Has new fuel pump and pressure regulator, I have cleaned fuel tank , lines, rail, and injectors. Relays and fuses are good. I took breather off and sprayed fuel into throttle...

sounds like an electrical problem .pump isnt coming on .turn on key listen for fuel pump to come on for 10 seconds then shut off on its own. If you dont hear the pump then its probley fuel relay . next check wires are plugged into fuel pump. lots of cleaning ?? is the fuel rail screen plugged ???? disconnect before rail if the pump comes on next. turn on key check for fuel pumping out line .

Nov 21, 2013 | Cars & Trucks

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Not getting fuel to no. 2 injector and no. 3 injector but one and four has plenty

i would check the wiring to tthe injectors first see if there is power getting to injectors then i would look at replacing them are they individual injectors or a rail type i think they are rail type if so the wiring or injector goosed as the fuel runs along the rail and the injector opens when the signal gets to it if you get what i mean hope this makes sence and helps ivan

Oct 17, 2012 | 1986 Volkswagen Cabriolet

1 Answer

My 86 300zx starts then shuts off

check the fuel rail for correct fuel pressure. If the Pressure regulator is faulty, the fuel pump will send fuel to the fuel rail, but it will be dumped back to the tank if the pressure regulator is bad, The fuel needs to be pressurised to go through the injectors and into the cylinders.

Good luck.

Feb 01, 2011 | 1986 Nissan 300ZX

2 Answers

Hi got a ford f150 1986 f/i will not start

check fuel pressure @ service port on fuel rail. also listen for fuel pump to come on when you first turn on key. pump is in fuel tank. also note i have seen a lot of f150 302 injectors clogg up.but that usually effect idle and performance. if there is good fuel pressure then check fuel injector signal with a tester called a noid light. it is inexpensive and can be found @ most auto part stores. you really should'nt check injector signals with a standard 12 volt testlight. it has been known to burnout the drivers on the ecu. test all that first.

Aug 04, 2009 | 1986 Ford F150 SuperCab

1 Answer

Cyl. 1 and 3 missfire

An injector can pulse without spraying fuel. They can get plugged or get build up on the nozzle and squirt fuel instead of spraying or not spray at all.. Your fuel rail is common rail, so your fuel line should go through a pressure regulator and then to a rail that dispenses the fuel equally. I have heard of cases where kia replaced the fuel rail to solve this problem. All the injectors will get the same amount of fuel pressure with this system, so if you have injector pulse and no missfires on #2 and #4, i would suspect clogged injectors. You can have an injector flush performed, which is probably not a bad ideal any way, to see if you can clean them up, or just replace the bad injectors. You can also inspect them visually to see if there is any debris on the nozzles. I wouldn't recomend that to an inexperienced person. Fuel can be very dangerous. I have head of techs removing the injector from the rail and running the car and watching the injector spray the fuel. Not recommended at all. All it takes is one spark or hot surface. Do a fuel injection clean, or buy some BG brand 44k fuel treatment and put in the tank first, the fill it up with gas. You can remove the injector and soak it in injector cleaner also to help free it up. If any of these don't help, time to take it in...they are also experiencing ECU problems..

Mar 07, 2009 | 2002 Kia Rio

1 Answer

Volvo 1986 760 turbo fuel injection

At the end of the fuel rail, attached to the front of the engine, is the FUEL PRESSURE REGULATOR. check to make sure that the vacuum hose attached to it is TIGHT. If this regulator is not functioning---replace it.

You may have to do a fuel pressure test to ascertain the correct pump pressure and function of your high pressure undercarriage pump. At lower than OEM pressure, the injectors will not open, even with fuel flowing through the rail.

Mar 04, 2009 | 1986 Volvo 760

1 Answer

944 fuel problems

If the fuel pressure regulator is stuck there will be to much pressure to the injectors and the injectors won't open, and thus no start. Since you relived the pressure by lossening the cap the engine ran.

Feb 26, 2009 | 1986 Porsche 944

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