How concerned should i be?

JeffBoyette

JeffBoyette

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Its not idling rough, just low and lopey. Tach shows 240-250, right at or just under the first line.
 
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Your cluster photo won't open for me on this stupid computer I have...All the other guages reading OK? No check engine lights? My tach shows an idle around 750ish. The idle is lopey too -- you can feel it and the shifter handle wobbles to and fro. Truck runs OK otherwise?
 
JeffBoyette said:
<img src="http://www.vtcoa.com/forums/attachment.php?attachmentid=46722"/>
<img src="http://www.vtcoa.com/forums/attachment.php?attachmentid=46724"/>

Its not idling rough, just low and lopey
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What year is yours? If it is an 06 it is probably a bad cluster. Mine would even read 0rpms driving down the road lol replaced and never happened again
 
It sounds low, not 250 low though. I dont know how it could idle at all especially not this smooth and consistant. I mean there is no jump in the tach. its solid at 250, no more lopey than my 05 was. Doesnt smell rich. And seems to run good at higher rpms. Unless the SCT can display the rpm, i really have no way of verifying. There are no surges in acceleration, or idle, and there are no dead spots in the throttle. No check engine lights.
 
Whether it'll hurt it or not, doesn't matter Jeff. It's not right. Trying the easy fix and change the TPS. $20 at the auto parts store and a lot of us have had issues with it. Could also bs ur idle motor. But I'd guess at the TPS. They go bad often and don't through codes. You know these motors idle a bit rough, but shouldn't be lopey.
 
SANTEEN said:
Whether it'll hurt it or not, doesn't matter Jeff. It's not right. Trying the easy fix and change the TPS. $20 at the auto parts store and a lot of us have had issues with it. Could also bs ur idle motor. But I'd guess at the TPS. They go bad often and don't through codes. You know these motors idle a bit rough, but shouldn't be lopey.
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I did read alot about the TPS. This truck has seen a year or two with less than 1k miles on it. I dont think the fuel would have gummed up the injectors or messed with the throttle body. The vipertech told me one time on my old truck that the throttle body needed sync'd. This could be the case here, but i also agree with you that the IAC valve should be compensating for any restricted airflow at the butterfly from carbon. The dyno on the truck was suspected to be low for the mods done. This was pointed out by Torrie that performed the tune. However, it is possible i guess that if the TPS was telling the computer it was at 80% throttle, it would throw the fuel and timing curves off. The truck seems a little lazy at low rpms, noticed by myself, and commented on by my wife. $20 bucks for a TPS seems like a cheap diagnostic. At 35k miles and 5 years its probably due for a tune up, and im not too confident on this Volant CAI.

The search continues. Opinions/Advice, keep them coming. This is the most knowledgeable forum out there, and a helpful group of ya too. Thanks again.
 
Your PCM is learning its new enviroment (Guessing that you didn't see low RPM's when you picked it up). However, I've been wrong so much I never know any more
 
If you or Geo changed to an aftermarket Tb there is a small chance the TPS is reading wrong if the new TB throttle stop is a bit different. I would also remove and clean the IAC as it will be covered in carbon. Other sensors also contribute, but the IAC actually does the controlling of idle air. As far as your Viper Tech talking about syncing the TB, tell him there is only one! The previous Gen Viper did indeed have 2 that needed syncing.:rock:
 
ViperJeff said:
Your PCM is learning its new enviroment (Guessing that you didn't see low RPM's when you picked it up). However, I've been wrong so much I never know any more
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Temperature and humidity were nearly identical here and Pekin Illinois. Also im at 100 feet and pekin is 650 ft. So the density is about the same. Not enough to throw it off like that. I could try to load the stock tune, unplug the PCM and let it reset to relearn. :dontknow:

Ill put this TPS on, see what it does.. then reload tunes and reset pcm
 
VENOMOUS1 said:
If you or Geo changed to an aftermarket Tb there is a small chance the TPS is reading wrong if the new TB throttle stop is a bit different. I would also remove and clean the IAC as it will be covered in carbon. Other sensors also contribute, but the IAC actually does the controlling of idle air. As far as your Viper Tech talking about syncing the TB, tell him there is only one! The previous Gen Viper did indeed have 2 that needed syncing.:rock:
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No i did read something somewhere about "syncing" it. Unplugging the IAC valve then setting the base idle. Plugging it back in and letting it relearn. Id have to find it again. maybe someone will chime in. I will take a look at the carbon on that IAC. The throttle body is stock, and doesnt look like its ever been removed.
 
JeffBoyette said:
No i did read something somewhere about "syncing" it. Unplugging the IAC valve then setting the base idle. Plugging it back in and letting it relearn. Id have to find it again. maybe someone will chime in. I will take a look at the carbon on that IAC. The throttle body is stock, and doesnt look like its ever been removed.
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ONly reason to reset idle like that is if an aftermarket TB is installed IMO. :dontknow:

I agree with reloading the factory tune, seeing what that does, then reload the Torrie tune.
 
JeffBoyette said:
I did read alot about the TPS. This truck has seen a year or two with less than 1k miles on it. I dont think the fuel would have gummed up the injectors or messed with the throttle body. The vipertech told me one time on my old truck that the throttle body needed sync'd. This could be the case here, but i also agree with you that the IAC valve should be compensating for any restricted airflow at the butterfly from carbon. The dyno on the truck was suspected to be low for the mods done. This was pointed out by Torrie that performed the tune. However, it is possible i guess that if the TPS was telling the computer it was at 80% throttle, it would throw the fuel and timing curves off. The truck seems a little lazy at low rpms, noticed by myself, and commented on by my wife. $20 bucks for a TPS seems like a cheap diagnostic. At 35k miles and 5 years its probably due for a tune up, and im not too confident on this Volant CAI.

The search continues. Opinions/Advice, keep them coming. This is the most knowledgeable forum out there, and a helpful group of ya too. Thanks again.
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I tell u what. You mention the volant intake. I noticed a significant drop in performance at the track in the midrange, with the Volant. Almost like a lag. Took it out and put the the factory intake back on with the drop-in K&N and no more lag
 
Truck did come with the stock box. I may put it back in too. Thanks a ton for that info.
 
JeffBoyette said:
Temperature and humidity were nearly identical here and Pekin Illinois. Also im at 100 feet and pekin is 650 ft. So the density is about the same. Not enough to throw it off like that. I could try to load the stock tune, unplug the PCM and let it reset to relearn. :dontknow:

Ill put this TPS on, see what it does.. then reload tunes and reset pcm
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No need to unplug the PCM. Install the new TPS, disconnect both battery cables, touch them together for 15 secs, reconnect, let it idle for a bit and then go flog the piss out of it.
 
JeffBoyette said:
Temperature and humidity were nearly identical here and Pekin Illinois. Also im at 100 feet and pekin is 650 ft. So the density is about the same. Not enough to throw it off like that. I could try to load the stock tune, unplug the PCM and let it reset to relearn. :dontknow:

Ill put this TPS on, see what it does.. then reload tunes and reset pcm
Click to expand...

Sounds good, just didn't know if it was at a significant altitude change. I know mine ran different when I would go to California and down the coast, than at 4800 ft
 
what u should have done first is hook it up to a scanner and see what the true rpms are then you could also check the tps voltage and read the iac counts/steps if you dont have one go to your local parts store and have them hook up scanner with live data
 
rbabody said:
what u should have done first is hook it up to a scanner and see what the true rpms are then you could also check the tps voltage and read the iac counts/steps if you dont have one go to your local parts store and have them hook up scanner with live data
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+1 agree
 
SANTEEN said:
I tell u what. You mention the volant intake. I noticed a significant drop in performance at the track in the midrange, with the Volant. Almost like a lag. Took it out and put the the factory intake back on with the drop-in K&N and no more lag
Click to expand...

try replacing that rumble bee engine with an 8.3 Viper engine like mine while you're at it.....:elefant::dontknow::D
 
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