Random revving

[dlaude]

Just bought a '98 Cobra and randomly when it is in neutral, the car will rev up to 2k or 3k and anywhere in between. Normal driving is fine, but will rev occasionally, not all the time. It doesn't do it right when I start the car, just after some driving. It's a D&D T-56, not sure if that's pertinent. I'm thinking it's a sensor or something. It's stock under the hood. Thoughts?

 

[ImThatGuy]

Maybe pull your IAC off and clean it, make sure its not gummed up. Just asking but do you have a BBK throttle body? What you are saying is what happened to mine after the TB install.

 

[dlaude]

Maybe pull your IAC off and clean it, make sure its not gummed up. Just asking but do you have a BBK throttle body? What you are saying is what happened to mine after the TB install.

I think it's the stock throttle body, but I'll check when I get home. Hmm, gotta google what an IAC is now haha. I'm not very knowledgeable lol.

 

[dlaude]

Alright cool, I searched on google this time (instead of just SVTP) and used some better keywords and found some results. Sounds like an IAC cleaning or tweaking is in order. http://www.svtperformance.com/forums/showthread.php?743379-96-cobra-iac-problem

 

[Zemedici]

Yes I would start with the IAC, I bet that's your problem.

 

[dlaude]

Cool thanks guys. Should I try cleaning it or just buy a new one? I'm trying to find a how-to on it, but can't seem to find one. It does seem pretty straight forward though, even for someone with barely basic skills like myself. If buying a new one is recommended, should I buy OEM or is aftermarket okay?

 

[Martin6107]

Buy a replacement and be done with it. Motorcraft parts are very hard to find in stock locally. I've had good luck with local part store products.

 

[dlaude]

Buy a replacement and be done with it. Motorcraft parts are very hard to find in stock locally. I've had good luck with local part store products.

That's kinda what I was thinking. Cool, thanks. I'll hit up the local Advance then. The plus side about that is that I can return it if it doesn't fix it lol.

 

[dlaude]

Is BWD the brand? Never heard of it, is it any good? http://shop.advanceautoparts.com/p/bwd-idle-air-control-valve-31009/18480971-P?searchTerm=iac

Should I get a new gasket, too?

 

[dlaude]

Or one of these? http://www.rockauto.com/catalog/x,carcode,1304479,parttype,6072

 

[dlaude]

Okay, bought the top one on this list http://www.rockauto.com/catalog/x,carcode,1304479,parttype,6072 and swapped it in, and I'm still seeing the hanging idle. I've noticed it happens once the engine is warm, and only on warmer days. I drove it in 30-40 degree weather over the weekend and it was fine, but drove it in the 50s this morning and it happened. Other thoughts?

 

[dlaude]

I noticed that if it is happening, if I put it in gear and floor it (in any gear), it temporarily fixes the issue. Throttle position sensor?

 

[ImThatGuy]

That's why I mentioned earlier in the thread about the BBK throttle body. My TPS is off a little bit and your problem seems similar to mine, because that throttle body has shit fitment. But its definitely worth a look.

 

[dlaude]

Yeah I keep forgetting to check, but I'm almost certain it's the stock throttle body.

 

[dlaude]

Confirmed, stock throttle body.