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

84 upgrade

 
Old 02-17-2019, 04:31 PM
  #21  
ex-x-fire
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Originally Posted by Radioway View Post
It smells really rich
Take the air cleaner off and check for vacuum leaks, the coolant temp sensors on the 84s are troublesome. Upgrade to a new style with matching connector. Any codes?
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Old 02-17-2019, 04:33 PM
  #22  
Radioway
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No its not showing a service engine light. But i have not had it checked for codes
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Old 02-17-2019, 04:35 PM
  #23  
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Also does the smell of being "rich" persist even when the car is completely up to operating temperature ?
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Old 02-17-2019, 04:40 PM
  #24  
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Yes and very much so when i get on the throttle
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Old 02-17-2019, 05:28 PM
  #25  
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It may smell rich while cold but not after it warms up. The video looks normal on start up until it warns up. like all said, keep an eye on coolant. BTY, there are only three colors of smoke from our cars..blue is oil, black is fuel and white is coolant or as in your case, cold start moisture.
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Old 02-17-2019, 05:30 PM
  #26  
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So there have been a few good suggestions on the rich smell. Another thing to check, the oxygen sensor and the thermac. Do the flaps on the air cleaner ever open up?

For the oxygen sensor, there is a way to test it with a paper clip on the aldl connector but that eludes me at the moment. It will also tell you if you're running rich or lean. I'll see if I can dig it up.

The other thing it could be is if the cat is gutted or bad and broken you'll get that smell too.

On the coolant sensor, does the car ever idle down to ~7-800 rpms? It never will if that isn't reading right.

Last edited by 84 4+3; 02-17-2019 at 05:31 PM.
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Old 02-17-2019, 06:35 PM
  #27  
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Where are you in NE Ohio ? My scanner will read an 84. If you are not too far away, I might be bribed by a cup of coffee.
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Old 02-17-2019, 08:58 PM
  #28  
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Youngstown
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Old 02-17-2019, 10:10 PM
  #29  
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45 minutes to an hour away depending on traffic, and the detours around here due to construction. I live straight across 224 from you, or straight across 76, then a jog down to 224, where 76/224 run together, about 13 miles from I-71. Oh well.
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Old 02-17-2019, 10:38 PM
  #30  
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So you can technically check everything with a meter anyway, minus the temp sensor technically. You could actually probe the ecm plug and check the resistance actually and get a decent estimate of if the ecm is seeing roughly the correct temp. Mine was factory and worked fine until I swapped intakes. The sensor plug disentigrated upon disconnecting...
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Old 02-18-2019, 03:14 AM
  #31  
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Originally Posted by drcook View Post
45 minutes to an hour away depending on traffic, and the detours around here due to construction. I live straight across 224 from you, or straight across 76, then a jog down to 224, where 76/224 run together, about 13 miles from I-71. Oh well.
Oh wow okay. Yea im in canfield right off 224
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Old 02-18-2019, 03:17 AM
  #32  
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I have a friend who has seen the video of the issue and he thinks misfire. I might add he is an ASE certified master tech who specializes in GM
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Old 02-18-2019, 06:30 AM
  #33  
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My 86 does the same thing on start up. It does run rich on the initial start up and that's pretty normal.

As far as a misfire is concerned, that's something you would feel. You would get a mild to heavy engine jerking under load and at idle, you would be able to feel it in the car. Misfires don't generally cause an engine to smoke. Misfires can be caused by simple things such as a failing spark plug or spark plug wire or they can be more in depth such as loss of compression through worn rings or valves. But I would personally rule out a misfire causing the engine to run rich or smoke.

The L83 does run a bit rich and each injector pumps a ton of fuel into the engine. Have you removed the air cleaner lid and checked the fuel spray pattern? There's a good chance that the injectors could stand to be serviced. How new are the plugs, wires, cap, and rotor? Couldn't hurt to replace them if you don't know when they were last replaced. Start with the simple basic stuff to make sure you are working with a good base. Honestly though, much like my car, if it runs a little rich initially, I don't mind. It runs and drives excellent and has a ton of power so I'm good with the initial start up rich condition and smoke.
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Old 02-18-2019, 08:02 AM
  #34  
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Originally Posted by mazdaverx7 View Post
My 86 does the same thing on start up. It does run rich on the initial start up and that's pretty normal.

As far as a misfire is concerned, that's something you would feel. You would get a mild to heavy engine jerking under load and at idle, you would be able to feel it in the car. Misfires don't generally cause an engine to smoke. Misfires can be caused by simple things such as a failing spark plug or spark plug wire or they can be more in depth such as loss of compression through worn rings or valves. But I would personally rule out a misfire causing the engine to run rich or smoke.

The L83 does run a bit rich and each injector pumps a ton of fuel into the engine. Have you removed the air cleaner lid and checked the fuel spray pattern? There's a good chance that the injectors could stand to be serviced. How new are the plugs, wires, cap, and rotor? Couldn't hurt to replace them if you don't know when they were last replaced. Start with the simple basic stuff to make sure you are working with a good base. Honestly though, much like my car, if it runs a little rich initially, I don't mind. It runs and drives excellent and has a ton of power so I'm good with the initial start up rich condition and smoke.
The plugs were changed last summer im doing the cap and rotor today as i bought one and never put it in. Figured couldn't hurt and ive looked at the injectors they do tick and i want to replace them

Last edited by Radioway; 02-18-2019 at 08:03 AM.
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Old 02-18-2019, 08:24 AM
  #35  
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The injectors will tick. It is just the style they are. If they don't leak and have a conical spray pattern they are fine.

Last edited by 84 4+3; 02-18-2019 at 08:24 AM.
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Old 02-18-2019, 09:41 AM
  #36  
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Originally Posted by 84 4+3 View Post
The injectors will tick. It is just the style they are. If they don't leak and have a conical spray pattern they are fine.
Its not really a cone more like a fan
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Old 02-18-2019, 10:33 AM
  #37  
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Originally Posted by Radioway View Post
Its not really a cone more like a fan
That could be a problem then.
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Old 02-18-2019, 11:43 AM
  #38  
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It does not seem to be hard to replace them.
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Old 02-18-2019, 12:06 PM
  #39  
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Takes about 5 minutes.
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Old 02-18-2019, 12:10 PM
  #40  
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As soon as good weather is here and I can take the car out, if you have not had it scanned by then, maybe we can meet halfway for coffee or lunch and I will bring the scanner and go through and see what the car tells us. However some of the richness could be because of an EGR issue. In the 1984's and EGR issue did not trip a SES.

Back to the "white smoke"


Im talking huge amount of white smoke then it slowly tapers off and i don't really see any while driving down the road. It did it in the summer too but only on a cold start and it was not as much or last as long. Not sure if its getting worse or if the cold is making it appear as though its getting worse. But it did happen in the summer as well
All of this is just indicative of water/condensation burning off. The key points are that as the car warms up, it dissipates. If it was a blown headgasket, or bad rings (blue smoke) or valve seals (blue smoke) it wouldn't go away and you would be able to smell the oil burning. If a blown headgasket, you would notice the coolant level going down and you would be able to open the system (I am unfamiliar with the coolant system of an 84) and probably see bubbles.

Read this about EGR's and take note that the 84 uses manifold vacuum for the EGR system. You could look at that

https://tech.corvettecentral.com/201...egr-diagnosis/
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