What works choke on a 1988 Corvette?
11-16-2017, 03:28 AM
#22
Race Director
Yes. The thermo time switch is right next to the ECM's CTS in the front of the manifold. It has a brown insulator, and uses a "injector type" connector. There is a recent thread with pics of it that I think JoeC posted.
This is speculation on my part:
The last year for the Cold Start injector is 1988. In 89 they go to the Multecs that have a better atomization pattern than the EV-1's. So can they use a longer IPW to get the engine started cold without as much risk of flooding or oil dilution as there would be with a long IPW on an EV-1? There has to be a correlation between the abandonment of the cold start injector with the adoption of the Multec Injectors. The Multecs can deliver the needed fuel for a cold start, but the earlier EV-1's couldn't.
This is speculation on my part:
The last year for the Cold Start injector is 1988. In 89 they go to the Multecs that have a better atomization pattern than the EV-1's. So can they use a longer IPW to get the engine started cold without as much risk of flooding or oil dilution as there would be with a long IPW on an EV-1? There has to be a correlation between the abandonment of the cold start injector with the adoption of the Multec Injectors. The Multecs can deliver the needed fuel for a cold start, but the earlier EV-1's couldn't.
If I wagered a guess, it may be as simple as not having enough computing power or memory in the earliest ECMs. Possibly even a stock issue with intakes?
There was a computer change in 87. Plus... I've seen the tuning parms for the 85, 86, and 87. Compared to my 89, code/parms WERE less sophisticated. (The assembler code was less sophisticated too.) Code improved in 87, 88, then again in 89. You know how SLOW (us) computer programmers are!
Once programmers got the "computing power" to code for cold start via the 8 existing injectors, it could have been a function of how many "9th injector" intakes they had left before it made sense to cast another version w/o the cold start injector.
Bean counters, you know!
11-16-2017, 11:36 AM
#23
Race Director
11-16-2017, 04:13 PM
#25
Team Owner
Is an apple better than an orange? The systems are completely different. Does the 84 have the same efficiency as the L98? I think not. So in one sense, it might be "better". Better depends on how you define the word.
11-16-2017, 06:56 PM
#27
Team Owner
11-16-2017, 07:15 PM
#28
Race Director
I'm not sure the KISS comment applies when (increasingly "smart") technology has led to: easier diagnosis, better efficiency, and more power....and possibly less collisions with autonomous driving.
11-16-2017, 07:34 PM
#29
Team Owner
Considering the distracted or DUIs, not to mention the other reckless driving and brain farts, I'm going to guess that if done properly, the autonomous driving will have to work really hard to be less dangerous than people
11-17-2017, 03:19 AM
#31
Race Director
11-17-2017, 06:48 PM
#32
Safety Car
Sorry. Was that an offensive answer? I do "have a clue", because I've read the book, and I've had my '84 for 14 years, so I've learned a few things about it. I didn't want to hijack this thread with a long explanation that had nothing to do with the OP's question. Okay? Please have another beer!
By the way, I'm not trying to say that my '84 has a better EFI system than the L98's, in spite of my attempt at humor with Aklim! GM is always trying to advance the technology, sometimes even with success! (The Optispark is debateable.)
By the way, I'm not trying to say that my '84 has a better EFI system than the L98's, in spite of my attempt at humor with Aklim! GM is always trying to advance the technology, sometimes even with success! (The Optispark is debateable.)
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whalepirot (11-21-2017)
11-17-2017, 07:46 PM
#33
Team Owner
Sorry. Was that an offensive answer? I do "have a clue", because I've read the book, and I've had my '84 for 14 years, so I've learned a few things about it. I didn't want to hijack this thread with a long explanation that had nothing to do with the OP's question. Okay? Please have another beer!
By the way, I'm not trying to say that my '84 has a better EFI system than the L98's, in spite of my attempt at humor with Aklim! GM is always trying to advance the technology, sometimes even with success! (The Optispark is debateable.)
By the way, I'm not trying to say that my '84 has a better EFI system than the L98's, in spite of my attempt at humor with Aklim! GM is always trying to advance the technology, sometimes even with success! (The Optispark is debateable.)
https://www.google.com/amp/amp.timeinc.net/thedrive/news/16169/the-2019-chevrolet-corvette-zr1-will-try-for-a-sub-7-minute-nurburgring-lap-time%3fsource=dam
11-17-2017, 08:11 PM
#34
Race Director
Sorry. Was that an offensive answer? I do "have a clue", because I've read the book, and I've had my '84 for 14 years, so I've learned a few things about it. I didn't want to hijack this thread with a long explanation that had nothing to do with the OP's question. Okay?
You came across like "Go read a book."
I think your IMPLICATION is that CFI "cold enrichment/choke" controlled by the computer....though you didn't follow-thru and expressly say that. If I didn't have curiosity about the "evolution" of computers (ODB1), I wouldn't have asked. I'm aware of many differences between the TPI years (85-91) but never learned as much about CFIs.
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Dirttracker (11-20-2017)
11-19-2017, 12:38 PM
#36
Race Director
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Dirttracker (11-20-2017)
11-19-2017, 01:52 PM
#37
11-20-2017, 03:54 PM
#38
Intermediate
Thread Starter
So i have to pull radio to check fuse?
Thanks for the clarification. As an 89 owner, I've read lots of things on the differences between it and earlier TPIs but hadn't heard that before.
Is the "termo-time" switch a separate switch vs. the temp switch in the front of the (my) intake?
I think the OP was on the right track trying to figure out HOW TPIs get more fuel when cold.
Is the "termo-time" switch a separate switch vs. the temp switch in the front of the (my) intake?
I think the OP was on the right track trying to figure out HOW TPIs get more fuel when cold.
11-20-2017, 03:57 PM
#39
Intermediate
Thread Starter
11-20-2017, 07:15 PM
#40
Race Director
That's what was posted at the bottom of page 1. To be honest, I'd try and confirm operation at the injector (plug?) before pulling the radio. There's some vids on YouTube for testing function of an injector.
Always pays to test thoroughly before buying parts.
Always pays to test thoroughly before buying parts.