C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Apr 6, 2018 | 10:15 AM
  #21  
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You need a gauge pressing Schrader valve indicates presence only. Pressure should be over 43 psi. Factory Service Manuals?
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Old Apr 6, 2018 | 11:21 AM
  #22  
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Originally Posted by Kevova
You need a gauge pressing Schrader valve indicates presence only. Pressure should be over 43 psi. Factory Service Manuals?
I’ll have to get a gauge. No no service manuals ):
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Old Apr 6, 2018 | 11:45 AM
  #23  
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You have to check multiple things. Firstly, did you rebuild the engine yourself? Are you experienced with this type of work? Did everything go back together correctly? Have you done a compression test on each cylinder? Have you checked fuel pressure at the Schrader valve with a correct fuel pressure gauge? Have you checked that the wiring is connected correctly and that there are no breaks, kinks, or pinched wires anywhere?
Why are you jumping the VATS? Have you checked for any stored codes?
Your fuel pressure is regulated also by an oil pressure sending unit if I’m not mistaken.
Good luck. You’ll soon find your problem and be on the road in no time!
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Old Apr 6, 2018 | 11:45 AM
  #24  
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You’ve got spark and fuel pressure but no injector pulse. Either the ecu is not getting the correct information to cause the injectors to fire or the information is not being picked up by the injectors. Make sure all the connectors to the distributor are connected and in all the way and that the injector harness by the firewall is connected.
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Old Apr 6, 2018 | 12:33 PM
  #25  
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Maybe someone can share the " No Start " trouble chart.
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Old Apr 6, 2018 | 01:09 PM
  #26  
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Originally Posted by Bagpype
You have to check multiple things. Firstly, did you rebuild the engine yourself? Are you experienced with this type of work? Did everything go back together correctly? Have you done a compression test on each cylinder? Have you checked fuel pressure at the Schrader valve with a correct fuel pressure gauge? Have you checked that the wiring is connected correctly and that there are no breaks, kinks, or pinched wires anywhere?
Why are you jumping the VATS? Have you checked for any stored codes?
Your fuel pressure is regulated also by an oil pressure sending unit if I’m not mistaken.
Good luck. You’ll soon find your problem and be on the road in no time!
Yes I’ve done this multiple times just never with all this electronic stuff. Yes I have compression correct on all cylinders. I don’t have a gauge handy (as of right now) to check the pressure at the shrader valve. I have not traced all the wires yet (trying to work on this as well as three other cars lol...) Jumped the VATS just to make sure that wasn’t stopping the injectors. No I haven’t had a chance to check the codes. I could replace the sending unit just to eliminate that as well. This one is just giving me a run for my money. Lol I really appreciate everyone’s help this far.
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Old Apr 6, 2018 | 01:10 PM
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Originally Posted by ihatebarkingdogs
Is there a Code 46 in the ECM? Have you checked to see if this code exists?
I have not as of yet. I will today.
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Old Apr 6, 2018 | 07:57 PM
  #28  
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Originally Posted by ihatebarkingdogs
Is there a Code 46 in the ECM? Have you checked to see if this code exists?
So I’ve checked the codes. I have 0 indicated by flash(pause) flash flash (long pause) and repeat. I’ve traced my wires and from what I can tell, I have no frays, no cuts, and no pinched wires. I did notice that the oil sending unit is fairly loose (I could move it by hand) it is in such a tough spot that it looks like I’m going to have to remove the plenum and try and get it a little tighter.
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Old Apr 6, 2018 | 08:11 PM
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Originally Posted by Sean4413


So I’ve checked the codes. I have 0 indicated by flash(pause) flash flash (long pause) and repeat. I’ve traced my wires and from what I can tell, I have no frays, no cuts, and no pinched wires. I did notice that the oil sending unit is fairly loose (I could move it by hand) it is in such a tough spot that it looks like I’m going to have to remove the plenum and try and get it a little tighter.
Honestly, I suspect your timing is just too far off to run.
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Old Apr 6, 2018 | 08:17 PM
  #30  
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So I took the distributor out again. Looked back and found these stuffed down. I see nowhere for them to go. Can anyone identify them?
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Old Apr 6, 2018 | 08:41 PM
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4 wire is to the distributor - wire colors are likely WHITE, PPL/WHT, TAN/BLK and BLK/RED.

Do you have the FSM for this car?

What color is the single Weather-Pack wire? What color is the loose wire with the female spade. I ain't an L98 guy.

Last edited by WVZR-1; Apr 6, 2018 at 08:46 PM.
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Old Apr 6, 2018 | 08:43 PM
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Originally Posted by WVZR-1
4 wire is to the distributor - wire colors are likely WHITE, PPL/WHT, TAN/BLK and BLK/RED.
I’m sorry. I definitely should have clarified... the two wires next to the dizzy 4 prong wire are the ones I need to know about.
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Old Apr 6, 2018 | 08:51 PM
  #33  
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Originally Posted by Sean4413


I’m sorry. I definitely should have clarified... the two wires next to the dizzy 4 prong wire are the ones I need to know about.
The 4 wire is what I ID'd for you...........................OR I don't understand your clarification. There should be a 4 wire short harness coming from the distributor that mates to the 4 wire in your snapshot.

Last edited by WVZR-1; Apr 6, 2018 at 08:53 PM.
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Old Apr 6, 2018 | 09:14 PM
  #34  
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I think I see a larger pink wire burried down there. That might be the power wire to the dist. Won't run without that!! There should also be a white wire for the tach. Those two wires plug into the bottom of that lump on the side of your dist.

Do I see exposed threads on that manifold bolt? I hope not!

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Old Apr 6, 2018 | 09:15 PM
  #35  
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Originally Posted by WVZR-1
The 4 wire is what I ID'd for you...........................OR I don't understand your clarification. There should be a 4 wire short harness coming from the distributor that mates to the 4 wire in your snapshot.
I’m sorry. Here’s what I’m asking about.
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Old Apr 6, 2018 | 09:32 PM
  #36  
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Originally Posted by Sean4413

I’m sorry. Here’s what I’m asking about.
And I asked you a few posts ago what the wire colors are. What are they? I believe I understand them but you could certainly clarify. I believe the Weather-Pack is likely EGR Diagnostic Temp switch. Is wire maybe DK GREEN? If the other wire is actually WHITE it could be the tach filter wire to distributor but I would have expected a different female for the spade. The actual connector shell is missing also if that's what it is. Follow the wire and see if it takes you to a 'capacitor' appearing device rear of left cylinder head.

Last edited by WVZR-1; Apr 6, 2018 at 10:07 PM.
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Old Apr 6, 2018 | 11:23 PM
  #37  
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Originally Posted by Hot Rod Roy
I think I see a larger pink wire burried down there. That might be the power wire to the dist. Won't run without that!! There should also be a white wire for the tach. Those two wires plug into the bottom of that lump on the side of your dist.

Do I see exposed threads on that manifold bolt? I hope not!

Yes the large wire is the power for the dist. I have it pushed out of the way for the time being. I was wondering about the other two wires in the picture that are next to the distributor hookup. And no threads showing here. Maybe just the angle of the pic haha. The white wire for the tech broke off (I have it laying on the work table) so I know that’s not sitting in there tucked away.
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Old Apr 6, 2018 | 11:24 PM
  #38  
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Originally Posted by WVZR-1
4 wire is to the distributor - wire colors are likely WHITE, PPL/WHT, TAN/BLK and BLK/RED.

Do you have the FSM for this car?

What color is the single Weather-Pack wire? What color is the loose wire with the female spade. I ain't an L98 guy.
I’m sorry I just now seen this. I’ll check first thing tomorrow to see th actual colors of them.
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Old Apr 7, 2018 | 02:03 AM
  #39  
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This is sort of off topic, but if the motor was just rebuilt and has no miles on it, why is there so much loose crap in the top of the intake. I hope the inside of the motor doesn't look like that. Also as Hotrod mentioned, you have a loose runner bolt.
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Old Apr 7, 2018 | 02:58 AM
  #40  
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Originally Posted by Sean4413
So I took the distributor out again. Looked back and found these stuffed down. I see nowhere for them to go. Can anyone identify them?
Originally Posted by 383vett
if the motor was just rebuilt and has no miles on it, why is there so much loose crap in the top of the intake. I hope the inside of the motor doesn't look like that. Also as Hotrod mentioned, you have a loose runner bolt.

Why have you decided to hide part of this picture? If that "too long" bolt, and the debris is any indication, you have a huge problem with putting this engine together. Sorry to be so direct, but it looks like you aren't being honest with us! Are you playing games, or are you just incompetent? I'm suspicious!

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