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Limp Mode / Bad Idle?

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Limp Mode / Bad Idle?
Old June 6th, 2020, 10:25 PM   #1
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Limp Mode / Bad Idle?

Howdy all!
I've been having a minor problem with my '97 GTS for a bit, and I'd like to bounce it off of y'all. This is an on-and-off occurrence, so I am not entirely sure what to make of it.

Generally this happens when I am first starting out for the day, but I have had it happen after driving, stopping for an hour or so (hot day, car was still warm), and then continuing driving.

Anywho, I don't know what triggers this, but I will try to describe it as best I can now, and will try to get a video the next time I go for a drive.

Under normal conditions, my GTS is perfectly fine idling in first gear. Rolling at 3-4ish mph at 500 rpm or so.

When the issue comes up (could be while crawling, or while easing off the clutch to get into first) rpms drop to almost nothing and she feels like shes about to stall. Adding clutch brings rpms back up to normal idle. In this state, throttle response does not exist, and I can't get it out of that gutter.

(possibly related, in this condition she will idle at normal rpms in neutral/clutched in but has the tendency to 'hang' at 2500rpm sometimes)

It'll lug around like that for a while, and will only pop out of that state when I much more aggressively get into first (keeping rpms far higher than I should and slipping the clutch until the car catches up.

I don't know if gen II vipers had a limp mode, or if this is it, but I am very curious to hear y'all's thoughts.

Maybe I'm just a bad driver and shouldn't be subjecting her to such low revs, but her ability to handle the same situation later in a drive makes me think something is awry.

Any input would be greatly appreciated! Thank you.
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Old June 7th, 2020, 12:28 AM   #2
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While not exactly what you are describing, I had an idle issue that was resolved after installing a new battery. Under normal conditions, your idle should be closer to 800 rpm. Are you reading it correctly?
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Old June 7th, 2020, 02:38 AM   #3
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Quote:
Originally Posted by CajunMojo View Post
While not exactly what you are describing, I had an idle issue that was resolved after installing a new battery. Under normal conditions, your idle should be closer to 800 rpm. Are you reading it correctly?
I'll have to check the battery out--not sure how old it is. And yeah, it has always idled around 450-550 for me (guestimating based off of the tach). Haha maybe the choppiness that I have been loving is actually a bad thing
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Old June 7th, 2020, 03:28 AM   #4
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Test the TPS, it could have a flat spot and will cause erratic throttle inputs.
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Old June 7th, 2020, 08:25 AM   #5
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TPS and/or MAP voltages...ergo the need to have a full-up battery. Battery voltage also affects injector timing...so it can be a watershed of issues with low battery voltages. What does your voltmeter show at idle and cruise? 13.8 or higher?
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