C4 won't start without Starting Fluid
After sitting for a day or longer, my C4 will not start when I'm cranking it normally.
If I squirt a blast of staring fluid it will fire off. Sometimes it takes several "squirt and crank" iterations to get it started. Once started, on any given day, it will run well and start-up reliably if I turn it off. I'd appreciate any good advice??? |
Originally Posted by 49er
(Post 1599158916)
I'd appreciate any good advice???
First: Please fill out your Personal Profile. It's much easier to give advice when we're not required to be psychic, too! There's only a few of us that qualify for that title. Second: What year Corvette are you working with? :cool: |
Could be a bad Fuel Pump Relay
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Why would the fuel pump relay suddenly start working after I spray starter fluid and get it to start?
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Originally Posted by 49er
(Post 1599161449)
Why would the fuel pump relay suddenly start working after I spray starter fluid and get it to start?
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Originally Posted by 49er
(Post 1599158916)
After sitting for a day or longer, my C4 will not start when I'm cranking it normally.
If I squirt a blast of staring fluid it will fire off. Sometimes it takes several "squirt and crank" iterations to get it started. Once started, on any given day, it will run well and start-up reliably if I turn it off. I'd appreciate any good advice??? |
Originally Posted by 49er
(Post 1599161449)
Why would the fuel pump relay suddenly start working after I spray starter fluid and get it to start?
Does the engine start if you crank it a long time? What if you crank for a few seconds, stop for a few, and then crank again? |
Originally Posted by Y-bodluvr
(Post 1599161743)
The fuel pump relay just sends a signal to the fuel Pump before startup.
The relay activates the fuel pump to provide fuel pressure, before the engine starts. If the relay ( or its connector ) is bad, you won't have any fuel pressure to start the engine. When you spray starting fluid into the engine, you are providing the fuel to start the engine. After the engine is running, you don't need the relay. If you use a jumper wire to put 12 v. on pin G of your ALDL connector, will the engine start without starting fluid? The ALDL connector is at the bottom of your instrument panel, to the right of your steering column. Why won't you tell us what year Corvette you are working on??? :cool: |
Originally Posted by Y-bodluvr
(Post 1599161864)
The problem may also be temperature related, a bad coolant temperature sensor.
But we've got to know the year of your car! |
Originally Posted by Y-bodluvr
(Post 1599161743)
the fuel Pump Relay just sends a signal to the fuel Pump before startup.
https://cimg8.ibsrv.net/gimg/www.cor...04e10ca5cb.gif Initial Prime for 2 seconds comes from the ECM, then once the the engine cranks, the relay kicks in, if the relay fails, the circuit can be completed by the oil pressure switch. |
Originally Posted by KyleF
(Post 1599166601)
Study the diagram......
https://cimg8.ibsrv.net/gimg/www.cor...04e10ca5cb.gif Initial Prime for 2 seconds comes from the ECM, then once the the engine cranks, the relay kicks in, if the relay fails, the circuit can be completed by the oil pressure switch. |
Originally Posted by Y-bodluvr
(Post 1599166684)
My GTA had a brand new fuel pump AND oil pressure switch and still a NO START until the fuel pump Relay was replaced
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Originally Posted by Hot Rod Roy
(Post 1599165258)
:iagree:
But we've got to know the year of your car! |
Pretty sure OP’s car is a 93 automatic
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Originally Posted by Silver85
(Post 1599168699)
If it's an early model you could simply have an issue with the cold start injector. The slow ECM and batch firing made for some difficulty on the early year models to get the fuel mixture rich enough to fire off in colder conditions.
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Thanks all! Good info I did not know about.
Sorry...it's a 1993 Rock-Stock I'm confused about the fuel pump relay thread. I would think the fuel pump requires power all the time the key is on, not just during starting. I'll try pin "G" this weekend. The oil pressure interlock is something I did not know about. Isn't there also a cold-start injector too that could be the culprit? |
Originally Posted by 49er
(Post 1599174038)
Sorry...it's a 1993. I'll try pin "G" this weekend.
It's times like this the FSM sure comes in handy!! (Factory Service Manual) :cool: |
Originally Posted by 49er
(Post 1599174038)
Isn't there also a cold-start injector too that could be the culprit? |
Thanks for the wiring diagrams. That explains a lot! The replies are also really helpful!
Yes a 93 automatic. I'm in Los Angeles, so it is not "cold". Problem occurs when it hasn't been started for say 24 hrs. One thing that is odd...after I get it started the first time, it will re-start no problem for the rest of the day. Maybe there is residual pressure in the FI system so the prime circuit is not needed if it's only been sitting for 30 minutes? Does that make sense? Thanks again to all for taking the time to help me out.!!! |
I had this problem with 1989 with a L98. Didn't away's happen but did happen a lot. Turned out to be intake was leaking air. After it was sealed up never had the problem again
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