Question about 1996 Chevrolet S-10 Pickup

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Very hard to start cold 1996 4.3 V6. Once started it runs OK. Starts right up with a little carb cleaner sprayed into the intake. Fuel pressure is at 58 psi, temp sensor 3.3k ohms at room temp. IAC wires looks OK.

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  • Chevrolet Master
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Auto choke temperature sensor might need replacing

Posted on Apr 30, 2010

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Car will start right up when cold go down road dies starts back up once hot shut off starts back up let it set ten min. wont start has spark has fuel pressure put new fuel pump in old pump did same thing...


Could be a relay or other electrical issue.
You say it has fuel pressure and spark, if that were true it should run.
So it either does not have enough spark to fire the plugs under compression, or not enough fuel pressure going thru the injectors, or not at the right time.
You might want to check for trouble codes in the computer.
There has to be something missing from the equation when it won't start. You may have to check all of the plugs for fire and try some carb cleaner sprayed into the intake to boost fuel supply to find the issue.

Sep 20, 2012 | 1989 Buick Century

2 Answers

How much fuel pressure is needed? I can not hear the pump but when I crank the engine fuel comes out of fuel rail. Car starts and dies right away


30-40 psi. th epump should run for 2 seconds when turning the key on, then run when engine is cranking and/or running.

Sep 22, 2011 | 1992 Mercury Cougar

1 Answer

Have a 90 f-250 5.8 gas burner. sat in a warehouse for 2 years. new battery and gas. starts and idles great. run up rpms for 2 minutes and it starts choking out. let off fuel and goes back to idling...


Carburetta is fouled. Run fine on choke - rich mixture. As it warms up and choke pulls off, its starving for gas.
First try adding fuel system cleaner to the gas tank. Do NOT go overboard. No more than double the recommended mix ratio.
The alternative is to remove the carb, open the bowl and spray out the jets and venturi with carb cleaner.

Its possible you may help it by removing the air filter and spraying every orifice you find on top of the carb. With carb cleaner. Be very carefull not to flood, pool carb cleaner in intake as this is not healthy for engine either. You can do this with engine running, so as not to pool, but slowly is best, both in engine speed and volume of carb cleaner.

Jun 22, 2011 | 1990 Ford F250

1 Answer

2002 Chevy Express 2500, 5.0. Cranks but won't start. Has spark, good fuel pressure. Replaced cap, rotor,wires, plugs, cam and crank sensors. No check engine light on, no current codes no codes in...


FUEL PRESSURE MUST BE 62 LBS. OR GREATER OR IT WILL NOT GROUND INJECTORS, IF ITS OK THEN CHECK YOUR GRAY 12V SUPPLY TO PUMP AT CRANK-UP, YOU MAY HAVE A POOR IGNITION SWITCH.

Nov 26, 2010 | 2002 Chevrolet Express

1 Answer

I have a 1995 chevy blazer that wont start by cranking it will start if you spray gas into intake was starting before bleeding the air out of fuel rails


sounds like your fuel pump is dead or you still have air in the system

however, even if you had air in the system, it purges itself when you try to start

therefore, a weak fuel pump cannot overcome the air block and your car won't start

however, you did not specify if the vehicle will stay running once started on carb cleaner

if the vehicle starts and stays running with the carb cleaner then you are probably dealing with a defective fuel pressure regulator


May 13, 2010 | 1995 Chevrolet Blazer

1 Answer

Will not start only backfires and start dieseling.5.7 automatic. hear fuel pump running. ran fine last trip and parked overnight. few times in past week or two. little trouble starting. rough idle for few...


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 you get a intake or engine full of starting fluid it can blow things. Carb cleaner will start it if it is a fuel problem and lot safer. Also in the good old days when i was a kid, i used to get a couple of cans of starting fluid and get in the back and have a good starting fluid spraying contest. Good for a big blast if someone lights a match. 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.
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?



Feb 01, 2010 | 1998 Chevrolet C1500

1 Answer

Sometimes car won't start after driving. Can start it by spraying carborator cleaner in where air cleaner is. Replaced fuel regulator, didn't help. Doesn't do it all of the time, but want it fixed. If it...


Try cleaning the IAC valve locate near the air cleaner intake hole . Remove the aircleaner duct work. And when the car does start. Run engine at 1200 rpms or so. Spray carb cleaner inside the hole to the sides of the walls. you can see 2 small holes to the side of the walls. That is the IAC. Turn engine off ,let the cleaner soak in. Then restart the engine and spray some more. when I say spray , I mean a good 10 seconds of spraying right at the little holes . See if your car starts running better. if this does not work, replace the IAC it is on the outside of the fuel intake . You can also try the MAF sensor. Mass Airflow Sensor located on the big pipe on the air cleaning system.

Jan 06, 2010 | Mercedes-Benz 560-Series Cars & Trucks

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

Car won't start once in a while, mostly after it sit's a few days. it cranks ok and almost starts. good spark, and has fuel but I can't test fuel pre. if I pull the lines from the tank it starts and runs...


your on the right track,you need three things to run an engine spark fuel and air,you can test your pump another way its primitive take 2+2 carb cleaner get access to your throttle body have someone try starting the engine while another sprays the carburetor cleaner into the throttle body if it runs while you spray and then stops when you dont your fuel pump is the problem.Chrysler is know for this fuel pump problem.

Aug 04, 2009 | 1996 Dodge Neon

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