Question about 1999 Chevrolet Blazer

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99 chevy s10 blazer gets good spark has over 60 lbs of fuel pressure tries to start but wont

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  • bruce_m1974 Apr 07, 2011

    the motor is brandnew do you still think it will help?

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  • Chevrolet Master
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If you can confirm us about the right fuel pressure there (60 PSI os upper), I would also check the spark from the ignition coil, and test the ignition module.

Confirm and check the interlock safety system and also the clutch has a sensor that tells the ECM if it is ok to start or not because of clutch being engaged; the interlock safety system won't let it start if it isn't in park or neutral on most vehicles.

Some aftermark, Antitheft or Passlock is installed there? Some fault codes or check engine light turn on?

Keep us updated.

Posted on Apr 07, 2011

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  • Master
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Hi


Usually a camshaft position sensor would give you a no-spark condition. You said you're definitely getting spark, and if you're getting fuel flow, then it all sounds good.

Try this: pull out all the spark plugs and place a tablespoon or so of oil in each cylinder. Put them all back in, and then crank it for ~30 secs or so with your foot held all the way to the floor until it begins to catch. Once it starts to catch (if it does), let up on the gas, and hold the idle up with your foot until it can idle on its own. It will smoke a lot, but if the compression has run down (e.g. if the car was moved quickly and shut off) it will build up the compression washed away from the rings by the sheer amount of gas dumped in when the car is started.

So basically, when you start the engine, a car DUMPS gas into the cylinders to get it started. Similar to the choke setting on a lawnmower or old carbureted car. All that gas washes down the oil from the rings and you lose compression, so it's not able to build up enough to start again if the engine's quickly shut off before it has a chance to get running normally. Once it's running, it doesn't have any problems, as the oil pumps around and the compression builds back up again.

Try the holding the pedal to the floor trick, if you can't get it to start in 5 minutes or so, pull out the spark plugs and take a straw full of oil (put your finger over the top and stick it in a container and pull it back out) and put it in each cylinder, put the spark plugs back in, and crank until it catches, then hold the idle steady with your foot till it can run on its own.


Also check this useful link, I hope it will answer most of your answer related to your problem:-


http://www.aa1car.com/library/us1296.htm


Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com




Posted on Apr 07, 2011

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2 Answers

99 chevy blazer cranks but wont start


CHECK BATTERY VOLTAGE FIRST IT SHOULD BE 12.5 VOLTS.IF NOT REPLACE BATTERY HAVE ALTERNATOR CHECKED.IF BATTERY GOOD.HAVE VECHICLE SCAN FOR PCM PROBLEMS - CRANKSHAFT SENSOR PROBLEMS OR CAMSHAFT SENSOR PROBLEMS.IF ALL IS GOOD GET A SPARK TESTER AND FUEL PUMP PRESSURE GAUGE TESTER.IF GETTING NO SPARK PROBLEM COULD BE LOOSE BAT.POWER SUPPLY WIRES AT IGNITION COIL MODULE OR IGNITION MODULE FAULTY.IF FUEL PUMP NOT RUNNING CHECK FUSE ABD RELAY IF BOTH IS GOOD FUEL PUMP FAULTY.

Apr 02, 2010 | 1999 Chevrolet Blazer

2 Answers

1997 chevy blazer getting fuel and spark but not starting, only backfiring through carb.


You need 3 things.
Compression
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.

You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
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. Do not leave home without it.
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.


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 when done.
What are your cold start pressure readings?
Post back what you have. Good luck

Dec 24, 2009 | 1997 Chevrolet Blazer

1 Answer

99 Tahoe engine cranks, wont start


You need 3 things.
Compression
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.

You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
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.
Do not leave home without it.
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.


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?
Post back what you have.


The other thing to that is common is the (ICM) under the distributor cap. There is a breather screen on the bottom of the distributor that get's clogged with dirt causing condensation promoting corrosion, this was gm TSB for replacing the cap and rotor to make sure it's clean.

Good luck and hope this helps. Merry Xmas.

Dec 24, 2009 | 1998 GMC Safari

1 Answer

Car wont start. Has spark, tried Carb Cleaner.


You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
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.
Do not leave home without it.
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.

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?
Post back what you have. Good Luck

Dec 24, 2009 | 2002 Chevrolet Blazer

1 Answer

I have a chevy s10 blazer that will not start it


If you have good pressure to fuel rail, then you may want to check the voltage coming to each injector with a voltmeter.
You may also want to check and make sure that every cylinder is getting spark.
If you are getting spark and fuel, then you may have a bad sensor somewhere but the car should be put on diagnostic scanner to pinpoint exact problem location.

Aug 25, 2009 | Chevrolet Blazer Cars & Trucks

1 Answer

1999 chevy blazer wont start


THE FUEL PUMP IS BAD.

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

3 Answers

My 1996 s10 blazer wont start it has new fuel pump and has spark. I changed the spider but still wont start


Like Kristisamp Said check the Fuel pump relays, they are little black box shaped fuses in the glove box, there are 3 of them, I think there may be a cover over them so you can see it......
Take the cover off and there you go......
I have a 96 blazer 2 door that had the same problem, I repalced thes relays and Bam!!! fired right up........

Jan 07, 2009 | 1996 Chevrolet Blazer

2 Answers

86 Chevy wont start


check for spark by removing a sparkplug

Dec 31, 2008 | 1986 Chevrolet S-10 Blazer

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