92 astro van cpi 4.3 the injectors arent delivering gas to the cylinders. got gas to the injectors and good spark. the 2 wires on top of injector , with key on one is hot , is the other one suppose to deliver the pulse from distribitor? its dead. i traced the dead wire to the big silver box on the passengers sidewall. the van just died while i was driving and it wont start back. i can spray starter fluid in the breather and it will crank.

TAKE IT TO NOONE ELSE BUT A CHEVY DEALERSHIP AND HAVE THEM RUN A DIAG GIVE YOU AN ESTIMATE. I LOVE THOSE OLD CHEVY ASTRO VANS I HAVE HAD 3 OF THEM. SIMETIMES IT IS CHEAPER TO JUST REPLACE THE OLD VANS RATHER THEN SPEND MONEY ON THEM. THE LAST VAN I HAD I HAD PUT OVER 700,000 MILES ON IT BEFORE I GOT RID OF IT.

could be your coil, but can also be internal, have you replaced both the air & fuel filters ? if so, dump some good fuel injector cleaner into tank when half empty , top off with 91-92 octane fuel, see how that works for you, do some highway driving, stop & go traffic creates problems, todays fuel w/ethonal is bad for older cars, be sure to have code cleared from ecm !

This is a Central Point Injection system. He could not check the injectors that easy. You need to get a thermal camera, or a temperature gun. Take a look at the temperature of the exhaust when the van is running. You will see that the cylinder #4 will be cool compared to the rest. Also you will see that cylinder #4 spark plug will be White in color, when removed. The electrodes of the spark plug will be white. That is a lean condition. That injector is bad. You will need to pull the intake manifold and replace the central point injection system as a whole. AC DELCO Central Port Fuel Injection for Silverado Sierra Express Savana...

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

each cylinder has an injector( 6 in all) and they are electrically controlled, they are on the top of the intake manifold located above the spark plugs but on the top side of the intake, they each have an electrical connector that plugs into them at the top, some removal of other parts may be neccessary, but if you have the right stuff you should be good to figure this out.
Have Fun.

#1 NEED TO VERIFY SPARK AT SPARK PLUGS # 2 CK FUEL PRESSURE AT SCHRADER VALVE ON FUEL RAIL ,,PRESSURE DEPENDS ON TYPE ENGINE ....IF NO SPARK AT SPARK PLUGS CHECK SPARK FROM COIL WIRE , IF NO SPARK AT COIL ,CHECK VOLTAGE TO IGNITION COIL SHOULD BE 12 VOLTS, IF NO VOLTAGE AT COIL ( KEY ON ) CHECK FUSES THEN IGHITION SWITCH. IF NO FUEL PRESSURE AND FUEL PUMP RUNS REPLACE PUMP .. CK VOLTAGE TO FUEL PUMP WHILE CRANKING . CK USING PUMP GROUND WIRE AT THE PUMP CONNECTOR THIS WILL PROVE GROUND ALSO. USE TEST LIGHT TO VERIFY

THE FIRING ORDER IS AS FOLLOWS : 1-6-5-4-3-2.
CYLINDER NUMBERS (front-to-rear) :
LEFT (driver side) 1-3-5
RIGHT (passenger side) 2-4-6

To set ignition timing, ensure that engine is at operating temperature, (190 degrees or above), bypass EST (electronic spark timing) by unplugging the single tan wire with a black stripe from the distributor. Ignition timing should be set at 0 degrees or TDC (top dead center). If not, loosen distributor hold down bolt and adjust, then retighten.

P0301 is a DTC code that indicates a misfire to cylinder one. It could be a bad spark plug, spark plug wire, rotor and cap, a dirty fuel injector, or the worst a bad head gasket. Cylinder 1 is the first cylinder on the drivers side, towards the front. Start with the simple and check the spark plug wire and add fuel injector cleaner to the gas tank. Good luck and hope this helps you get you van running 100% soon. If that did not help, then your going to have to do a tune up by replacing the spark plugs, wires and rotor and cap. You can get all the parts you need at Auto Zone and they can give you the step by step to get the job done with common tools in under 2 hours of your time. Keep me posted, be glad to know you got your van running 100% again soon.

check the fuel pressure(min of 45psi)under the hood at the port. if thats ok, check for intermitten spark(esc)electronic spark control may be getting hot and missing a beat....if thats ok then check the MAF sensormalfunction, but you should have a code for all but fuel pressure.good luck

underneth the intake manold is were your fuel injector poppet nozzles are, more than likely the fuel line hose that goes thru the back of the intake is split and leaking fuel underneth the intake manifold if you check the fuel pressure you will find that the fuel pressure will drop down to 0 psi as soon as the fuel pump shuts off and it should hold pressure