Fuel injection issue will crank wont fire 1994 4.3 Vin W
dch1965
07-11-2008, 07:19 PM
Hello and thank you in advance for your time and patience.
I have a Jeep Chevy conversion I am currently working on. Here are the particulars:
1994 Chevy S10 Blazer 4x4 Vin # W Vortec 4.3 CPI with 4L60E Transmission. Drove the Blazer prior to engine removal and was in good shape. Engine, transmission, engine compartment wiring harness and computer from the Blazer to go into the below described Jeep CJ7
1985 CJ7 2.5 4 Cyl. in great shape with engine removed for the above engine swap. Wiring harness left in place for the time being.
I have completed the mechanical which was the easy part of the install and have all the required fluids and hookups and am ready for the engine to be wired for startup.
We have used a remote starter to bypass the steering column. We have the fuel pump wired and grounded, spark which we tested all wires for, continuous fuel pressure of 62 psi and two solid grounds to the engine block and firewall and the computer hooked properly to the engine compartment wiring harness.
When the engine is turning over with the remote starter bypass it will not start the engine even with the above 62 PSI fuel pressure. After repeated attempts we noticed fuel draining out of the exhaust (not hooked up yet) Manifolds leading us to to first believe there was no spark.
After testing for and confirming spark we decided to attempt turning over the engine without the fuel pump and when the fuel pressure reached about 45 PSI the engine started and ran until fuel starvation. We then were able to keep the motor running by feathering the fuel pump (touching the fuel pump wire to the positive battery post) when needed to add fuel to the engine.
My goal is to use only the fuel injection, sensor and transmission portions of the wiring harness from the Blazer and keep the Jeep system wiring for lights, radio and other accessories.
I am not sure what we are missing here. I am not an expert... and definately believe there is something simple I am missing here. I posted to a jeep forum and was a little concerned when administrator/expert said that year came only in a throttle body......
I am not an expert and any help would be greatly appreciated by my girlfriend who thinks time with her should be the priority and not my jeep..... ;)
Thanx,
David
I have a Jeep Chevy conversion I am currently working on. Here are the particulars:
1994 Chevy S10 Blazer 4x4 Vin # W Vortec 4.3 CPI with 4L60E Transmission. Drove the Blazer prior to engine removal and was in good shape. Engine, transmission, engine compartment wiring harness and computer from the Blazer to go into the below described Jeep CJ7
1985 CJ7 2.5 4 Cyl. in great shape with engine removed for the above engine swap. Wiring harness left in place for the time being.
I have completed the mechanical which was the easy part of the install and have all the required fluids and hookups and am ready for the engine to be wired for startup.
We have used a remote starter to bypass the steering column. We have the fuel pump wired and grounded, spark which we tested all wires for, continuous fuel pressure of 62 psi and two solid grounds to the engine block and firewall and the computer hooked properly to the engine compartment wiring harness.
When the engine is turning over with the remote starter bypass it will not start the engine even with the above 62 PSI fuel pressure. After repeated attempts we noticed fuel draining out of the exhaust (not hooked up yet) Manifolds leading us to to first believe there was no spark.
After testing for and confirming spark we decided to attempt turning over the engine without the fuel pump and when the fuel pressure reached about 45 PSI the engine started and ran until fuel starvation. We then were able to keep the motor running by feathering the fuel pump (touching the fuel pump wire to the positive battery post) when needed to add fuel to the engine.
My goal is to use only the fuel injection, sensor and transmission portions of the wiring harness from the Blazer and keep the Jeep system wiring for lights, radio and other accessories.
I am not sure what we are missing here. I am not an expert... and definately believe there is something simple I am missing here. I posted to a jeep forum and was a little concerned when administrator/expert said that year came only in a throttle body......
I am not an expert and any help would be greatly appreciated by my girlfriend who thinks time with her should be the priority and not my jeep..... ;)
Thanx,
David
corem
07-11-2008, 09:06 PM
First I am no expert ,but would try to start the Jeep with just wires. I found that it is best to keep it as simple at first so it is easy to trace problems. How about vacum lines, and are the sensors wired up like knock and so on.
MT-2500
07-13-2008, 08:58 AM
What fuel pump and fuel tank did you use?
Wrong pressure from fuel pump could overload injectors.
Check fuel pump injector pulse.
If flooding it is shorted or grounded out.
Any fast leak down on fuel pressure.
Also the fuel pressure regulator on insuide in and out fuel lines to it could be blown.
Nut kit?
Wrong pressure from fuel pump could overload injectors.
Check fuel pump injector pulse.
If flooding it is shorted or grounded out.
Any fast leak down on fuel pressure.
Also the fuel pressure regulator on insuide in and out fuel lines to it could be blown.
Nut kit?
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