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Hello, I'm reaching out see if I can get any suggestions help with my 82 corvette. I'm having an issue with the engine remaining on and holding steady. When I start up the engine it turns on, but after 1 or 2 pumps to the gas it turns off. One of the cross fire which is in the driver side (rear) one doesnt shoot out any gas. I thought it was the fuel injector so I replace it and still no gas shooting out. When I first bought it it started and test drove it. At the time it was low on fuel so I decided to put 91 gas in it and did not flush it out. Did make a mistake by not doing that or am I not getting enough voltage to my fuel injector, also the battery is brand new. If someone out there could give me some help or advice on what to do I'd really appreciate it. I bought it 7 months ago and didn't have a chance to drive it yet. Thank you.
Blu22, welcome to the Corvette Forum. I believe you've come to a great place to get answers to most of your Corvette questions.
You didn't mention anything about your level of expertise with Corvettes or automobiles in general, so I'll suggest that what you might need is to find someone nearby to help you diagnose your issue. If you had mentioned where you are located in your profile this would help us point you in the direction of a reliable source to consult. It might even result in identifying a member nearby that can provide direct assistance. Most here are more than willing to assist in any area they have experience with.
I don't believe that your selection of 91 Octane is anyway related to your problem. It looks like Fast81 has given you a good place to start. By all means let us know what you discover and don't be afraid to ask questions.
at the top of this section are the stickies. see the 82 my issues one? info on the crossfire and reading codes etc. with efi, even the most primitive efi you start with the fault codes because sometimes the brain box is right.
In my '82 I have on experimental occasions run tanks of 91, 93, and ethanol free 90, but I have always stayed with 87. I found it runs fine on the 87 the owner's manual calls for, and no better with the more expensive higher octanes. I also did not experience bad issues with any of them and certainly no impacts like you are having. As to the ECM engine code light system next to the seat belt light, watch out for burnt out bulb -- which you can check when you first turn key. I'm sure you will get good advice here and get it sorted out. BTW, my CF injection has worked well for years maintenance free. I have really learned to appreciate it.
crossfire works good. as long as it works good. one wire loose. vacuum hose off. and it will be out of whack. the ecm. 40 years old. once it dies it requires some kind of conversion. buccaneer will probably weigh in. he is the E F Hutton of CFI injection. when he speaks you listen...
Bad fuse, weak fuel pump, 'issue' with the EMC and/or sensors. You should start by downloading any 'trouble codes' from the OBD-1 diagnostic system that is built into your car. If you don't know what that is or how to use it, you need to Google info on it and study enough to understand what you have and how it works. Otherwise, you will be at the mercy of very expensive electronic repair technicians for the time you have this car. It's not 'brain surgery'. Just do it....
thank you. I'm just a newbie at all this. Low level apprentice. I love classic cars and just want to learn and understand how everything works from the motor to restoring them. Just for the love and nonprofit...
If you have confirmed that you aren't getting a pulse from the injector then it might be simple like the fuse is blown as was already mentioned. Definitely check that first because a blown fuse would be a cheap repair. If it blows again then you'll want to really get into the issue deeper since fuses really should not blow frequently at all.
Others will mention that you need to get on ebay and buy the 82 Factor Service Manual. They are not expensive at all and will guide you through the initial troubleshooting of this issue.
As to the 91 octane fuel.. that is not the source of your issue. Waste of money on this low compression engine, but it will not cause this type of issue.
When you turn the key to crank the car when dead cold the injectors will do an initial pulse to enrich the mixture for the cold start. If no pulse then at least you can somewhat isolate the search from that point forward. Power first, ground next, then signal pulse. Lots of info available on troubleshooting if an injector is bad or not. Don't buy any parts until you isolate the issue.
Buy the GM service manual like mentioned and save yourself lots of money and grief down the road. It IS a MUST have item if you have an 82 or 84 CFI motor. Also, try the fuse first.
QUOTE=derekderek;1603355509]at the top of this section are the stickies. see the 82 my issues one? info on the crossfire and reading codes etc. with efi, even the most primitive efi you start with the fault codes because sometimes the brain box is right.[/QUOTE]
Blu22, welcome to the Corvette Forum. I believe you've come to a great place to get answers to most of your Corvette questions.
You didn't mention anything about your level of expertise with Corvettes or automobiles in general, so I'll suggest that what you might need is to find someone nearby to help you diagnose your issue. If you had mentioned where you are located in your profile this would help us point you in the direction of a reliable source to consult. It might even result in identifying a member nearby that can provide direct assistance. Most here are more than willing to assist in any area they have experience with.
I don't believe that your selection of 91 Octane is anyway related to your problem. It looks like Fast81 has given you a good place to start. By all means let us know what you discover and don't be afraid to ask questions.
QUOTE=derekderek;1603355509]at the top of this section are the stickies. see the 82 my issues one? info on the crossfire and reading codes etc. with efi, even the most primitive efi you start with the fault codes because sometimes the brain box is right.
[/QUOTE]
Hi and thank all so much for your input and suggestions. As you know I'm a rookie at this and I'm learning alot as I'm going so thank you again. Currently I'm piecing the puzzle all together and will keep you posted. So far 1.i replaced the rear injector the one that wasn't shooting gas-no luck there. 2. New fuse for inj1 inj2- no luck there. Fuel pump is good cause I can hear when I crank it. Alternator is good. I really dont know where else.. btw if i wanted to check the voltage for the wiring for the injectors would that be 13 volts. Thanks again C3 forum
Trace the harness back to ECM. This is where the GM manual comes into play...diagrams. Also, your ECM may be bad for an injector driver. If so, good luck finding one. Lucky for you, I do have a solution if your ECM IS bad.
Hi and thank all so much for your input and suggestions. As you know I'm a rookie at this and I'm learning alot as I'm going so thank you again. Currently I'm piecing the puzzle all together and will keep you posted. So far 1.i replaced the rear injector the one that wasn't shooting gas-no luck there. 2. New fuse for inj1 inj2- no luck there. Fuel pump is good cause I can hear when I crank it. Alternator is good. I really dont know where else.. btw if i wanted to check the voltage for the wiring for the injectors would that be 13 volts. Thanks again C3 forum[/QUOTE]
Make sure you check or just replace the fuel filter as a plugged fuel filter can cause low fuel pressure.
OK, now I'm confused. Who is the OP here? Names are different, but it appears that Wilcar is the OP. If you are a different poster @Wilcar with a similar issue, start a new thread of your own, it gets confusing otherwise. Anyway, a simple way to see if your injector is bad was first to check the fuses, then just swap the injectors and see if it issue changes positions or not. It looks like either a bad harness/plug or ECM at this point, but hard to tell with the limited input on the details.
Trace the harness back to ECM. This is where the GM manual comes into play...diagrams. Also, your ECM may be bad for an injector driver. If so, good luck finding one. Lucky for you, I do have a solution if your ECM IS bad.
Hi buccaneer is it possible I call you. My number is 714.292.5355
04-24-2021, 03:10 AM
Corvette82
If you are a different poster @Wilcar with a similar issue, start a new thread of your own, it gets confusing otherwise. Anyway, a simple way to see if your injector is bad was first to check the fuses, then just swap the injectors and see if it issue changes positions or not. It looks like either a bad harness/plug or ECM at this point, but hard to tell with the limited input on the details.