Idle hang on '97 GTS
Discussion
Haven't been around for a while so no doubt this question has been answered before, but to save me looking through the archives could anyone suggest the cure for this problem.
Revs hanging at about 2000 or more and taking some time to return to normal idling speed. Only just started happening - no obvious cause. Looked at the US forum but no-one seems to have a definitive answer to this common problem. Maybe WE have ?.....
Revs hanging at about 2000 or more and taking some time to return to normal idling speed. Only just started happening - no obvious cause. Looked at the US forum but no-one seems to have a definitive answer to this common problem. Maybe WE have ?.....
'97s are prone to bad intake manifold gaskets, causes high idling. Almost all need the OE '97 gaskets replaced with the updated gasket.
You still have the stock airbox yeah? Some reduce the air pipe diameter to the idle air motor. You might want to check you PCM for codes (you can call them up on a '97 at the dash display) a faulty IAC will set a code. They 'gum' up too due to the engine oil puke (under braking into the air box) makes the piston / valve sticky, take it off and soak it in carb cleaner worked well for me.
You still have the stock airbox yeah? Some reduce the air pipe diameter to the idle air motor. You might want to check you PCM for codes (you can call them up on a '97 at the dash display) a faulty IAC will set a code. They 'gum' up too due to the engine oil puke (under braking into the air box) makes the piston / valve sticky, take it off and soak it in carb cleaner worked well for me.
Nad,were is the idle air motor?Had the same trouble with mine every year or 2 but it always seems to clear after a good run.The problem seems to occur if Venom is left in the sun with bonnet down and is then driven,idle won,t come down or i sometimes blip the throttle to clear the problem.Maybe i should take a look at this air motor as it,s never been cleaned.Don,t know if gaskets been changed?Look forward to hearing where it is.(I think i know but don,t want to strip off wrong part,any chance of a pic of it?)Cheers,TOM
Hi Tom, it's on the front passengers side corner of the intake manifold, right next to the throttle body that side, just follow the little hose up from the airbox passengers side, it gets it's air from the airbox, unless you use cone filters then it will have a small K&N filter on the end of the hose! It has electrics to it to unplug and 2 small bolts (11mm socket size) you will need another paper gasket if you take it off. It's only small, like a cylinder with little piston that pulls back to let air in to keep the motor from stalling when the TBs shut off. Restricting air into it will bring down rpm since it can't be adjusted at the PCM.
Jan's GTS ACR had this problem, it was a sticky throttle cable. Try cleaning where the cable exits the shielding and before it attaches to the throttle, (front top of engine). A bit of WD40 and someone to push the accelerator up and down a few times should help the cable to slide easier whilst you spray the WD40.
Before ripping off the intake manifolds and committing to what on a viper is bound to be an expensive gasket I'd start with a squirt of WD40 as VHR suggested, you wont get anything cheaper than that on a viper, also I've heard people have had success by increasing the throttle return spring tension, they have found the butterflies were not shutting by a whisker allowing a Nat's fart through. That ties up with VHR's suggestion, either increase closing force or reduce the force needed to close.
I also suspect it is more common on cars that don't get used much. Mine had it a bit when i got it but just as i was going to do something about it (new theory came up on the VCA) i realised i didn't really notice it anymore. Then after the car has been sitting for a month (another story), this morning its back. of course i could have just been getting used to it before.
Personally i don't like the idea of plugging up the IAC hose as has been suggested on the VCA, it seems a bit of a fudge to overcome the problem rather than fix it.
I also suspect it is more common on cars that don't get used much. Mine had it a bit when i got it but just as i was going to do something about it (new theory came up on the VCA) i realised i didn't really notice it anymore. Then after the car has been sitting for a month (another story), this morning its back. of course i could have just been getting used to it before.
Personally i don't like the idea of plugging up the IAC hose as has been suggested on the VCA, it seems a bit of a fudge to overcome the problem rather than fix it.
I get it on TB very occassionally, its not just a 97 problem with Jans being a '01 car. Another problem Dodge never manged to fix.
Last time was after a 150 mile trip and it did just as i was pulling onto the drive, stuck at about 2000 revs
>> Edited by Viper on Monday 14th March 22:33
Last time was after a 150 mile trip and it did just as i was pulling onto the drive, stuck at about 2000 revs
>> Edited by Viper on Monday 14th March 22:33
Ditto Phoenix surrers the same problem but does not seem to have a pattern to it, sometimes you run down the road and lift of the throttle only to find that it hangs for a second.
Other times it does it a start from warm which always makes you look like a boy / girl racer reving there car up at start.
But it never seems to do it at start up from cold ? weird.
I also did nearly 5k miles last year so I don't know if it relates to lack of use or not.
PV
Other times it does it a start from warm which always makes you look like a boy / girl racer reving there car up at start.
But it never seems to do it at start up from cold ? weird.
I also did nearly 5k miles last year so I don't know if it relates to lack of use or not.
PV
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