Question about 1997 Chevrolet Blazer

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1999 chevy suburban 5.7 L. vortec. Can a bad camshaft sensor cause a no start? rebuilt engine, fuel pressure 60 LBS.,spark at all the plugs, compression 140 lbs, timing is dead on.

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I do believe it will not start with out it if you can hook up a scan tool to it crank the engine and look at rpms while cranking should read about two hundred forty rpms thats what fires the injectors the cam sensor tells the computer what cylinder is ready to fire next also scanner will set the cam timming.

Posted on May 27, 2010

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What should fuel pressure be on a 94 Chevy S-10 4.3L Vortec?

60--66 psi.
In my opinion. After it starts, it should run with less pressure.

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I have replaced the camshaft sensor, Crankshaft sencor, computer, crankshaft pully, and new spark plugs on my 1999 Mitsubishi Eclipse and it still won't start, what could it be?

Engine needs spark, fuel and air to run. I assume the starter is turning the engine over. Have you verified you have spark at the plugs? Have you verified you have fuel pressure? Can you hear the fuel pump when you first turn the ignition key? If, yes to those, check the timing belt settings to make sure something hasn't caused the timing to change.

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1996 350 suburban will not start without starter fluid. 35 lbs. fuel pressure with key on[not running]. Runs great after I get it started. Have changed fuel filter 2 times. After running if left off 20...

The vortec engine has a time delay fuel pump relay, check that...Was your pressure reading with engine running?
Test your injectors. Check the coolant temp sensor, it will confuse the ECM if it is out of range...mainly when the engine is cool. Check the ignition for weak spark, coil resistance. Check the air flow sensor....I would stop using starting fluid immediately, the volatile conditions it creates could cause damage. Hope this helps.

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1997 chevy astro van willn't start new fuel pump and filter pressure 50 to 60 psi ,got spark turns over

If you have spark and fuel it should start. You must have min 57 PSI fuel pressure for this vehicle to start if it is the 4.3 Vortec engine. Also the cam sensor and the crank sensor control the spark. Does it have the check engine light on and if so what is the code or codes does it have? Need more info to help you out more.

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I have a 99 suburban 350 5.7 vortec the engine was just rebuilt and it has 3-5 lbs of oil pressure and drops to zero at ide (mecanical gauge) we replaced the oil pump last night and still has the same...

have you had the gauge tested to do go out of range over time. it could just not read lower readings i would check this before anything else, rule out the gauge having a fault.41 lbs PSI hot and ~55 lbs cold based on the dash gauge should be around these figures plus or minus, could also check vacuum lines for the engine breather. if i remember these also adjust the pressure as well.

Aug 10, 2017 | 1999 Chevrolet Suburban

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Hi- I need to know if the oil sending unit is bad in a 1999 chevy suburban 5.7L vortec will cause a no start condition?

No. The engine will still start, however if the sending unit is not working you will have no oil pressure and you will damage the motor and possibly lock it up. This vehicle can run with the unit not working correctly

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1 Answer

Our 1999 Chevy Truck looses power after the engine warms up. We have changed the knock sensors, o2 sensors, catalitic converters, and the fuel pump relay? What are we missing?

Have you had the s10 scanned for the DTC codes. Auto Zone scan free of charge and this should help figure out why your loosing power when the engine warms up. You could have a faulty MAP sensor or a weak fuel pump, dirty fuel filter.

Not knowing what has been done, here is a few things you can do and check.

You may be weak on fuel pressure, even a couple of lbs low on fuel pressure can cause low performance.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems. Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.

The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.What are the pressure readings that you have done.
What are your cold start pressure readings?

You need 3 things.
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors.
I think each injector is on a separate driver on that one.
Check for pulse to all of them.

The next thing you can look at is the Cap and Rotor, inspect for any damages and corrosion which is common to accumulate in the distributor due the a clogged vent screen at the bottom of the distributor. That is where is ICM is located also and my be on it's way out and needs to be replace.

Best thing to do is check for any DTC codes at Auto Zone and that should help determine what is causing your loose or power. A bad fuel pump and dirty fuel filter will not trip any DTC codes.

Start with the simple and check all the fuses, the wire leads to the MAP sensor, it's located on the passenger side on the intake manifold by the throttle body. Check then check the distributor Cap and Rotor and replace, check the fuel pressure reading, and almost forgot to check the MAF sensor.

Try this in the mean time, turn you ignition to the run position "engine not running" and pull the fuse to your ECM for 1 min and place back in. Turn your ignition off for 5 sec and turn on again for 10 sec and then start the engine. It may stall out, let it. just start it again and let idle for 2 min and go for a test drive. This will reset your ECM to default and relearn all the sensors on the engine and transmission. Any DTC codes will have been erased and any DTC codes will be new to the issues your engine is having. Good luck and keep me posted, be glad to help you get your S10 running 100% again soon.

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Engine hard to start sometimes vortec suberbun 1999

it looks like you need more fuel to start your engine check for a bad fuel pressure regulator, measure the pressure it should have 55 psi less wont start cold

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1999 Suburban doesn't want to cold start at all! Warm starts everytime...replaced everything the scanner (from the dealership) said was wrong

Check the fuel pressure regulator, i'm not a 100% if the small block vortecs have one but if it does it will be on the top of the intake, near the throttle body.

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1999 chevy blazer wont start


if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Apr 11, 2009 | 1999 Chevrolet Blazer

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