C4 Corvette No Start Troubleshooting Part 1
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- Hey Folks, I have been working on these videos for a while. Part 1 shows the procedures I use to test for the cause of a no start situation. In Part 2 I walk through a flowchart of symptoms and tests to find the most common solutions to a no start engine. Please enjoy and I hope these videos are helpful.
Link to Part 2:
• C4 Corvette No Start T...
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Hi, many thanks for your rapid reply and advice. Will do as you suggest and let you know the outcome
Good luck! just remember to measure voltages on the car and compare them to measuring at the battery under the same conditions. If the 2 measurements are different you have a loss of voltage in the connections somewhere.
Outstanding Video!!! Extremely Informative!!! Incredible Commentary!!!
Thank you. Hope it helped you out.
I sure will let you know what I find and yes I did subscribe. Have a good weekend and stay safe.
Thank you Sir, I learned a lot of important things from this video. You made the video in such a way that anybody would understand it. I appreciate you. Thanks again!
Thank you, I guess 27 years as a College Professor helps. Take care.
Joey, I posted an answer to your trans question on the Anti-Venom Mod video page.
@@justcorvettecrazy116oh ok. I'll check it out. Thanks so much.
@@justcorvettecrazy116 OMG, you do have that college lecture type voice. lol. I love it!
Thanks man just found out about you right now and biggg tips and really good help with understanding mechanic basics thanks i will be watching more of your videos as i nave a c4 project myself
Thanks for keeping it real 🙏🏿 Vette boyz put a hold on the tow truck I’m going to create a carry along kit so that anytime anyplace these methods can be applied and again “”my main MAN”” You are truly a JEDI::::let the FORCE be with you ✋🏿
Thanks! LOL
Thanks for the info ! May come in handy one day.
Thank you, I had a few people ask and I have answered more than a few questions.
I have a c4 hasn’t started if a few years same issue. It just cranks but doesn’t want to turn over. The city says it needs to be in running condition so I need to get it up and running. I used some starting fluid into the manifold. It starts up but then turns right off. I was going to start by replacing all the spark plugs then checking the gas tank making sure the fuel isn’t old.
OK, if it started with the starting fluid, then you most likely have a fuel delivery problem. I would start by checking the fuel pressure at the fuel rails. Could be that the fuel system is plugged or the fuel pump is not working properly. If you want to reach out at justcorvettecrazy@gmail.com I can help you out more.
This is very good video I m having this problems with my 1989 corvette turns n doe not start it wi start for a bit when I out stater fluid thank you
Thanks great video
Thanks for the nice comment! Hope it helps you out.
I too am at the no start phenomenon with 1000 options of potential problems
If you would like to shoot me an email at justcorvettecrazy@gmail.com maybe we can figure it out together.
I hope to never have a no start condition but if I do after watching this video I won't be in the dark as how to begin diagnosing. Good pointers. Thanks. Just thinking, would a scanner like the OBD-1 Sanp-ON MT2500 be useful doing these types of tests?
This is kind of off topic, but I’ll ask anyway. What Optima battery is that and did you have to modify the top posts to fit?
That was just a regular Red Top Optima I believe and no mods were were require to make it fit. It came out of the C5 Z06.
Hi, thanks for a great video, I'm in the UK and have a '91 C4. Car starts and runs fine. Try again engine cranks but won't start. Volt meter reads 8v so won't run. (13.2 at battery) Any idea where to look for a bad ground or +. UK mechanics won't touch it so I think its just a bad connection someplace.
Hey thanks for the question. Yes the first place I would check is for bad connection. As the car heats up the resistance of a bad connection will increase causing a loss in voltage. One thing you can try is to run a ground wire from the battery to some grounding point to see if the car will start. Another place to look is at the connections to the starter solenoid, make sure they are nice and clean.
I hope you subscribed to the channel. Let me know what you find out.
What would you recommend?
So I have to bang on the starter of my 1990 vet to get it to start up. Is replacing the starter the only option? TY
Thanks for reaching out. Could be a bad electrical connection on the starter. I would check that first to make sure everything is good before you toss in a new starter. So remove the electrical connections and clean them up and reinstall. Test it out to see if it made a difference. Let me know what you find. Good luck.
My 1988 corvette won’t start after watching this great video I made some checks and found I had spark but it would not run on either or even hit. So I checked fuel pressure key on 40psi for 3 seconds then I hear a click Fuel PSI drop’s to about 10. I unplugged all the injector’s it holds 40 PSI for more then 5 minutes as soon as I plug in any injector it dumps fuel pressure. Oh the engine will hit a little when the injectors are unplugged. Any advice will be appreciated thanks.
Mark,
See if you can find out if 1 injector is leaking or if there is a ground signal to all or half of the injectors all the time. All the injectors on the right side of the engine fire together and then the left side. They are also running off different fuses. My guess is that your ECU is sending a false ground to the injectors all the time dumping fuel into the engine keeping it flooded. Try pulling the fuses one at a time "Inj 1 and Inj 2" see what happens to the fuel pressure when you plug in the injectors. There could be a short to ground on the injector harness. Let me know what you find.
It does the same thing with the left or right bank fuse pulled. Should I check for ground problem’s now or try replacing the ECU? A couple days ago after this problem I removed the ECU inspected and cleaned The wire harness plugs to the ECU The connector pins and everything looked perfect before I cleaned them. Prom pins look good to.
Here is what I would check next...I would look to see if 12V is present across the injectors all the time with the key is in the run position. My theory is that the injectors are firing constantly flooding the engine. Do you access to an injector "noid light"?
@@justcorvettecrazy116 no but I have a multi meter that I barely know how to use Lol. I’ll check for 12v on all 8 inj. Number 9 cold start has been removed
If you use a volt meter it is a little harder. You need to check for 12V across the injector. You cannot use ground a s a reference point because there is 12V sent to the injectors when the key is on and the ECU provides a ground when the injectors are to fire. So if you check for 12V to ground it will always be there. So check directly across the injector wires. If you want to take this conversation off TH-cam, email direct to: justcorvettecrazy@gmail.com.
I'm having this issue on my 90 Vet, I got some contact cleaner but haven't tied it yet. I don't have a volt meter but battery seems fine and I tried jump starting it and I still got nothing. So I guess what I'm asking is if it is the battery it still should have started or had some noise when I hooked it up for a jump right? TY
Thanks for reaching out. If the secuity system is in lockout you will get no noise. Turn the lights on and if you get bright lights then your battery should be stron enough to get some noise unless it is the key. Reach out via email at justcorvettecrazy@gmail.com if you want to some help.
My 84 corvette won’t start with the hood down & even when I have the hood up it won’t start like it used to. Just changed a new battery & I got my starter checked & it works. Any ideas?
Daniel, is the engine turning over when you try to start it? You can reach out to me via email: justcorvettecrazy@gmail.com
Hi buddy, have been ill so haven't checked yet. Earlier this year I removed instrument cluster to fix speedo display. Its since then I've had the problem. I have a pinout diagram for a 1990, would it be the same for a '91? Can check grounds then. Sorry to be a nuisance to you.
I just posted a new video on finding bad connections using a voltmeter. Best of luck.
if my key does not have that connector is that an issue? it started without it before but now is a no start
What year is the car and what are the symptoms?
@@justcorvettecrazy116 1984. Started and drove fine a few days ago but as I tried to start it the dash didn’t light up completely dead. Charged battery and the cars dash would light but the car wouldn’t crank at all when turned.
@@drshortstuff4824 It is possible that you activated the anti theft mode. Try locking and unlocking the drivers door with the key a couple of times to see if it resets?
You can reach me via email: justcorvettecrazy@gmail.com
This is random and completely out of my blue, but my mechanic replaced my starter and now my car has zero power, no dash, no nada. Any idea of what it could possibly be? We didn't blow any fuses, plus the alternator and battery are brand new (along with the starter) the c4 only has 64k, was very well maintained in a garage life. Any insight would be huge, thanks!
Did the main ground get disconnected during the install? I would start looking there and backtrack.
I have a 90 Corvette convertible Basic 42000 miles with good fuel pressure 45 lbs, spark plugs fire, injectors flashing light via noid light test lamp a good battery, doesn't want to start but when I disconnected the injector plug the car started and stayed running. Had no issues till i turned the car off and came out later to start it and nothing but a turning over cranking and no ignition/start ? any check procedures that are recommended ?
What injector connection are you talking about? It sounds like you might have a short circuit in one injector. All of the left injectors are connected together and all of the right are as well. So 1 bad injector could take down the whole side. What I would do is check to make sure both fuses are good. Then start unplugging 1 injector at a time and try to start the car. If at anytime the car starts then the injector that is currently disconnected is the bad one. Let me know what happens.
@@justcorvettecrazy116 sitting behind steering wheel it would be the left front injector No 1 injector.Keep in mind the car was running great until it decided to not start a few hours later? Both fuses have power. The car seems to have good power at idle even though the injector wire is disconnected. As per your reply the No 1 injector , the car starts and runs it could possible be that one as the injector with the bad attitude other wise the car will not start with that wire connected.
What happens when you plug that one back in and unplug a different one? If the car does not start then i would say that first injector is shorting out the rest.
@@justcorvettecrazy116 Ill be doing exactly that but have a few things that demand my attention at this moment. Ill will let you definitely know . If by chance that it is injectors what brand would you prefer, I have the I think are the OEM brand with the grey body/housing ? " Finally a voice in the wilderness! Can't thank you enough.
I went aftermarket on my project Vette. If you are planning to keep the car for a long time, don't cheap out. It is a job you don't want to do more than 1 time. So look for OEM or equivalent replacements. Unless you are going to do some performance mods. Might need to look into larger than stock in that case. Don't forget new O-rings as well. I have another video on the replacement procedure for the injectors.
My battery was 10.5! Is that good?
Not really, the only time you should see 10.5V is when you are starting the engine and it is turning over for a long time.
94 corvette, ran fine. I left key in vehicle over night. Went to start it today, started and ran for a couple seconds and died. Restarted the same thing. Now when i turn key nothing at all. Only thing i see is check gauges. Dont even hear key in ignition buzzer , only gauge i see moving is amp gauge and tach moves. Windows, lights , climate control all work. When key is on i do hear a clicking behind gauge cluster. Also hear the same noice when open and close door with out key in ignition. Have checked fuses and battery = good. Any idea;s ??
Have you tried boosting the battery with another car? Just to see if it starts and runs.
@@justcorvettecrazy116 Have 12 plus going out battery, as well as alternator. Gonna check ignition relay, then ignition switch
@@kimmaxwell8975 Sure sounds like voltage issue to me. Make sure you check your grounds. Leaving key in ignition should not do anything except drain the battery. Let me know what you find out.
@@justcorvettecrazy116 Ive had battery tested and its good. Im in process of bypassing VATS system. I do have a noisy relay under the dash. In the meantime gonna get under it and check out starter and grounds
@Kim Maxwell Keep me posted. Those symptoms don't sound like VATS. Let me know what you find.
I just got a 90 vetted having problems
Hit me up at justcorvettecrazy@gmail.com maybe I can help.
What kind of distributor is on your vette?
Distributor is stock with an Excel cap and coil.
No pulse to injectors 85 c4
That could be a few different things. Hit me up at justcorvettecrazy@gmail.com and we can try to figure it out.
I wish I could hear you better your to far away
yeah, sorry that was an early video. I have new equipment now.