Question about 2006 Chevrolet Cobalt

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NO INJECTOR PULSE WHEN CRANKING

FUEL PUMP PUMPING GOT SPARK CAR WILL RUN WHEN YOU SPRAY CARB CLEANER IN AIR BOX

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Sounds like cam sensor check it for codes

Posted on Apr 17, 2015

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Check cam sensor

Posted on Apr 17, 2015

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2002 MINI COOPER WONT RUN CRANKS OVER BUT WONT RUN SPAY A LITTLE ETHER IN IT IT WILL RUN FOR A SECOND IS IT THE FUEL PUMP


It's definitely a fuel problem but not necessarily the pump. An old trick (but isn't perfect) to check the pump is to bang, gently, on the fuel tank while someone is cranking the engine. If the engine starts, it's the fuel pump, however, if it doesn't start, it doesn't prove anything. You'll have to check to see if power is going to the pump. Another thing to check is to make sure the injectors are pulsing by testing them with a noid light. If the injectors are not pulsing this indicates that there is a computer related problem and you might need to use a scanner. BTW, I wouldn't use ether for testing as this could cause a blown head gasket. We usually use spray carb cleaner, as this is not quite as powerful.

Oct 03, 2016 | Mini Cars & Trucks

2 Answers

I have a 1987 chrysler conquest tsi and fuel pump only runs when key is on start not on run but pump fuel lines not hook only power wires to pump is this how it works?


What does it do with the lines hooked up ? Most fuel injected vehicles need an RPM signal to let the computer know the engine is running to let power continue to the pump .

Feb 04, 2016 | Chrysler Cars & Trucks

1 Answer

Will not start


Gas, air, compression, and spark is all the cylinders need for the engine to run. No start is usually gas or spark related. Here's the fuel check on fuel injected cars. Turning the key to on will start the pump for 2 or 3 seconds to pressurize the system. When the engine is cranking over the computer turns on the fuel pump relay again, so the pump will be on. And stays on after engine is running to keep high pressure against the fuel injectors. The computer times the injector pulse to spray gas into the intake or into the cylinder at the right time.
So if you have a no start, to check for gas, listen for the pump- a distinctive hum or buzz from the tank, check the fuel pump fuse, see if you can feel or hear the fuel pump relay click when someone turns the key to on. (Did you remember to check if the tank has gas?). Finally, you would have to check for power on the fuel pump wire at the tank connector, while someone holds the key in start. If you have power there, it's likely you need a new fuel pump. If the pump is working, well and good, but keep in the back of your mind that a weak pump that puts out low pressure can cause hard starting problems and poor running. At any rate, if you have gas up to the fuel rail, the only other thing between there and the cylinders is the injectors. Are they working? A quick check would be to remove a spark plug or two after cranking the engine over a few seconds. If they are wet with gas, the injectors are injecting. Hope I've helped you out some. I know some people who say to spray some starting fluid into the air intake to check if you have a gas problem with starting- I've done it myself. But I've learned it's better to use carburetor cleaner spray instead, it burns cleaner and something about the potentially harmful effects of starting fluid, well. good luck.

May 14, 2013 | Plymouth Voyager Cars & Trucks

1 Answer

87 ford tempo gl car will start and run for a while but then it quits running. then try to crank it over and it will start but quit immediately and it will keep on doing that. when it cools down it will...


It could be a fuel supply problem, plugged fuel filter or faulty fuel pressure regulator. When you turn the key to the on position, you should hear the the fuel pump run for a couple of seconds. This will tell you that the fuel pump is getting power, but it could still be weak. There are other things that could be causing the problem, does the engine have spark after it stalls?Do the injectors function?What is missing from the equation? Engines require compression, fuel, spark and air to run. If it is a fuel supply issue, after it stalls, you should be able to spray carb cleaner (acts as fuel) into the throttle body to restart the engine and keep it running at an idle by feeding the right amount of carb spray.

Mar 12, 2011 | Ford Tempo Cars & Trucks

3 Answers

My 95 blazer 4.3 will not start, it cranks, has


Try replacing the fuel filter, but it sounds like you have a weak fuel pump. Your cold start pressure should be 62-65 psi and drop about 5 psi when the engine is running. Anything less then 62 psi is going to cause you to have starting issues, you can also test your fuel pump by blocking off the return line to see if you get 75-78 PSI. this is just a test to see if your fuel pump is still good. If you have less then that with the return line blocked off, replace your fuel pump but check your ground wire first. The ground wire is separate from the wire harness and grounded to the frame and a bad ground will give you a weak pump.
Thank you for using Fixya and good luck

Mar 20, 2010 | 1994 Chevrolet S-10 Blazer

2 Answers

1997 Chevy Silverado 1500 4x4 will not start. Getting spark checked all fuses, changed rotar - spark plug wires,


Have you checked the fuel pressure? Fuel pumps are a common failure item on those trucks. Pick up a cheap fuel pressure gauge and hook it up to the shrader valve on the fuel rail. With the ignition on and you should have 55-65psi. Even if it's a few psi below spec it could stop the engine from firing.Once you determine the fuel pressure isn't adequate make sure you have a good power and ground at the fuel pump. If that checks out, time for a new fuel pump module. I recommend only replacing it with an AC delco unit, I've heard bad stories about aftermarket replacements.
You could also spray some carb cleaner or starting fluid in the throttle body and crank the engine over. If it runs for a few seconds after spraying starting fluid in you know you have a fuel delivery problem.

Mar 14, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

2000 chevy blazer will crank but wont start


You may have a bad or weak fuel pump, Try spraying Carb cleaner down the throttle body and see if the engine starts, if it does. You could have a dirty fuel filter that will need to be replaced, or a faulty Fuel pump "sending unit" Before you go off replacing the fuel pump, check all the fuses in the fuse panel at the end of the dash, drivers side. The check the ground wire to the fuel pump on the frame, a bad ground will cause a weak fuel pump. Then check your fuel pressure at the shredder valve, you should have 62-65 PSI with the fuel pump energized "engine not running", anything less then 62PSI the injectors will not work. If your fuel system is running 100% and there is 62PSI at the shredder valve, move on to checking the ICM "Ignition Control Module"/ When the ICM goes bad you'll not get any power to the spark plugs and check also the connection to the coil to make sure it's working also. Good luck and keep me posted.

Feb 22, 2010 | 2000 Chevrolet Blazer

2 Answers

My 91 cammry suddenly wont start I have spark for sure! I suspect a fuel problem where do I start. & whats the procedure Chuck


Easiest thing to do is make sure you right. On the air cleaner hose theres a smaller hose connected to it coming from the valve cover remove it and spray a little carb cleaner or gas into the big hose with the engine cranking. If it fires up running on the carb cleaner you know its a fuel problem if not the timing belt could have broke. To check that, on some models you can remove the oil filler cap and see the cam or rocker arm. Crank the engine and if the parts don't move the belt is brocken. Thats where to start

Aug 13, 2009 | 1991 Toyota Camry

2 Answers

Crank no start: has no spark and only has injector pulse on cyl # 1. if you spray starting fluid directly into throttle body car starts and stays running and has spark and inj. pulse. once you turn the car...


Fuel pump, you have to have press in the rail to fire all injectors- she will run on ether but not good for her. Ck your pump and any related fuses,relays,wiring.

Jul 11, 2009 | 2002 Hyundai Accent

1 Answer

1995 buick riviera sc won't start changed fuel pump ,


Have you checked for injection pulse or compression. Will it start if you spray carb cleaner in the intake?

May 05, 2009 | 1995 Buick Riviera

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