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Re: hard cold start 96 safari
Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.
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Did you check the fuel pump relay ? You would need to use a fuel pressure gauge and check pressure before you crank the engine. When you turn the key switch on, the pump relay is supposed to provide power for 3 seconds to boost fuel pressure. If fuel pressure is ok, the coolant temp sensor could be telling the computer the engine is warmer than it really is.
Most common reason for no start cold with a lack of fuel is the fuel pump relay or the check valve in the pump. The fuel line should have some pressure it it after sitting overnight. If not, the check valve in the pump may have let fuel flow back into the tank. It would take a few minutes of cranking to get it started. Also, if the fuel pump relay is not working, the pump would not get power until the engine has oil pressure.
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.
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.
I believe you have a throtle body correct? IF so you have poor fuel pressure, plugged filter of injector.If by some miracle you have a carberated engine the the fuel is leaking from the bowl. Get a carb rebuild kit.
IT IS PROBABLY THE FUEL PUMP. THERE IS AN ANTI-DRAINBACK VALVE THAT IS SUPPOSED TO HOLD THE FUEL PRESSURE WHEN THE KEY IS OFF. IT SOUNDS LIKE YOURS LEAKS. TO TEST IT, LET THE VEHICLE SIT LONG ENOUGH TO ACT UP. KEY THE VEHICLE OFF TO RUN THREE TIMES BEFORE CRANKING IT OVER. IF IT STARTS EASY, YOU CAN BET THE FUEL PUMP MODULE IS THE PROBLEM.
i had similar problem. hard to start in morning but once started, would start everytime until next morning. i changed fuel pump, filter, fuel pressure regulator, coil, cap, rotor, pickup coil, battery. i was finally told the '96 had a recall on the fuel injection assemby. i changed that out with the new mpf system and it solved the problem. runs like a striped ape. hope this helps.
check fuel pump relay/should run pump for two sec when key is turned on. try turning key on but dont crank did pump hum/if it did look towards leaky fuel inj./faulty pressure reg. poss clogged fuel filt.