What works choke on a 1988 Corvette?
11-14-2017, 04:15 PM
#2
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Check fuel, spark, and then I'd double check the readout from the computer for IAC counts and TPS voltage and just make sure the throttle stop screw wasn't misadjusted.
But I'd bet on fuel or spark. Buy a FP gauge, come back and tell us what it reads when you turn the key to Run, then how it behaves when you fire it.
I would pull a plug wire to see if I had spark but there are testers for this as well.
But I'd bet on fuel or spark. Buy a FP gauge, come back and tell us what it reads when you turn the key to Run, then how it behaves when you fire it.
I would pull a plug wire to see if I had spark but there are testers for this as well.
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Dirttracker (11-15-2017)
11-14-2017, 06:34 PM
#3
Team Owner
I'd also see if the plugs are old and nasty. Somehow get it running and see if it leaks from the plug wires in a dark garage with a water bottle spraying a fine mist AROUND the wires.
Beyond that, check the spark quality (must be solid blue), check the fuel pressure when you turn the key on, see if it holds that pressure and see what it does at WOT
Beyond that, check the spark quality (must be solid blue), check the fuel pressure when you turn the key on, see if it holds that pressure and see what it does at WOT
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Dirttracker (11-15-2017)
11-14-2017, 06:38 PM
#4
Race Director
The fact that either will get it going pretty much means you have a cold fuel delivery problem. The ignition system must be functioning or the either wouldn't help. Checking fuel pressure is the first place to start.
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Dirttracker (11-15-2017)
11-14-2017, 07:18 PM
#5
Race Director
As Aklim siuggested, check the plugs. If too cold or fouled, they will have trouble starting a cold motor. I would check the engine coolant temperature sensor also.
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Dirttracker (11-15-2017)
11-14-2017, 11:03 PM
#6
Race Director
And to answer the specific question presented by the OP, the ECM (computer) commands the injector(s) to spray more fuel. In the case of the 85-88 Corvettes, the computer sprayed it's extra fuel via the 9th injector aka "cold start injector". So, it's possible that is clogged or bad.
If you Google "1988 Cold Start Injector Corvette", you'll find some threads on that subject too. But the first thing is to determine what temperature the computer "thinks" the engine is?
Last edited by GREGGPENN; 11-14-2017 at 11:04 PM.
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Dirttracker (11-15-2017)
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Dirttracker (11-15-2017)
11-15-2017, 12:45 AM
#8
Team Owner
Haven't some people say that they removed the CSI and. It made it harder to start. Not this hard though.
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Dirttracker (11-15-2017)
11-15-2017, 12:53 AM
#9
Race Director
Last edited by 383vett; 11-15-2017 at 12:55 AM.
11-15-2017, 01:08 AM
#10
Safety Car
Nobody has answered the OP's question! There is no choke in a fuel injected car.
Can you hear the fuel pump run for about two seconds when you first turn on the ignition? A fuel pressure test should verify this issue.
Can you hear the fuel pump run for about two seconds when you first turn on the ignition? A fuel pressure test should verify this issue.
11-15-2017, 03:39 AM
#11
Race Director
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Dirttracker (11-19-2017)
11-15-2017, 07:55 AM
#12
Intermediate
Thread Starter
11-15-2017, 07:58 AM
#13
Intermediate
Thread Starter
11-15-2017, 08:02 AM
#14
Intermediate
Thread Starter
11-15-2017, 08:04 AM
#15
Intermediate
Thread Starter
And to answer the specific question presented by the OP, the ECM (computer) commands the injector(s) to spray more fuel. In the case of the 85-88 Corvettes, the computer sprayed it's extra fuel via the 9th injector aka "cold start injector". So, it's possible that is clogged or bad.
If you Google "1988 Cold Start Injector Corvette", you'll find some threads on that subject too. But the first thing is to determine what temperature the computer "thinks" the engine is?
11-15-2017, 09:27 AM
#17
Team Owner
We don't care what the gauge does. Get the computer one. That is how you know what the computer sees. With the thermometer, you know what the sensor should be reporting. Sensor is at 200 degrees and if the ECM doesn't see that, it will act according to what it sees. Maybe the wire is grounding somewhere or maybe the sensor is bad. Eliminate things one at a time
11-15-2017, 05:51 PM
#20
Race Director
Negative, Ghost Rider.
The Cold Start injector is NOT ECM-controlled. It is only powered when the key is in START, and the thermo-time switch grounds it. The lower the temperature, the longer the time switch will allow injection before it shuts off to prevent flooding.
In the 88, the cold start injector has its own fuse behind the radio in a 4-fuse aux holder. If hot restarts are OK, and only the cold start is affected, I would check this fuse.
The Cold Start injector is NOT ECM-controlled. It is only powered when the key is in START, and the thermo-time switch grounds it. The lower the temperature, the longer the time switch will allow injection before it shuts off to prevent flooding.
In the 88, the cold start injector has its own fuse behind the radio in a 4-fuse aux holder. If hot restarts are OK, and only the cold start is affected, I would check this fuse.
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.
