High Idle @speed In Neutral

[RVT04]

OK I GOT INTO A COASTING @ SPEED MOOD AND BUMPED IT INTO NEUTRAL
THE TACH CLIMBED TO ABOUT 1800 AND STAYED THERE FOR THE DURATION OF THE COAST ABOUT 1/4 MILE AND THEN WHEN I APPLIED THE BREAKS TO CORNER IT DROPPED DOWN CONCURRENT WITH MY SPEED UNTIL I DROPPED IT BACK IN GEAR ? WHAT GIVES?
SHOULDN'T THE IDLE SPEED BE THE SAME IN NEUTRAL LIKE ANY THING ELSE?

[jgc61sr2002]

RVT04 - Welcome aboard - Coasting in neutral can be dangerous. The trans. helps control your speed ( slow you down) when decelerating. IMO.

[Marauderman]

RVTOR- I recall this having been mentioned awhile back--but that does cover almost a year=--don't remember it's conclusion but it may be a return to dealer fix situation---try a "search" in our upper left corner box--try different wording for your inquiries--maybe that will help---if not --take it to dealer with your concerns-- it should return to normal in netural--mine does...

[TripleTransAm]

1st: stop screaming... I can hear you all the way over here in Montreal (caps lock).

For the idle speed, I've noticed the same. I believe it's a normal thing, and it happens to many many other cars.

Here's a theory that's been put together in conjunction with members of other forums: since the car is moving at speed, the theory is that the accessories (mostly the power steering) will require some RPM to apply the necessary amount of assist. Furthermore, some transmissions have their main fluid pumps driven by the input side (ie. engine RPM), and driving at higher speed with the engine at idle is a recipe for increased wear due to lack of lubrication... if the Marauder's tranny is built this way, that would definitely account for why the PCM wants a higher idle when coasting at speed in neutral.

I suspect it's a combination of the two. My manual transmission cars do it but not to the extent of my Marauder, and my GTA doesn't do it at all (but that's due to the older style engine management electronics).

In the end, I don't think it's a good idea to coast at speed in neutral, for vehicle control reasons and as a safety mechanism for tranny lubrication.

[Ross]

Welcome aboard.

[Lidio]

The high idle while still rolling has been normal on Fords with EFI for over 10 years now. This is very normal on manual transmission Mustangs for instance. You push the clutch in while still coasting to a stop and it sits at about 1200rpm or so and then when you get just under about 3-4mph it will then finally come down to about 670rpm.
I believe Calibrators do this simply because they can when rolling and because from an emissions stand point your always cleaner when your at a higher and I'm sure the accessory's like it too. This is why when you free rev a motor they come back to a idle rather slowly. This is called dashpot. In the old days with carbs it was a mechanical part bolted to the carb and didn't let the idle come down real abruptly when free revved. It also helped take the clunk out of the drive line on stick cars when lifting off the throttle quickly. Also emissions are typically higher when returning to an idle abruptly.

Thanks

[TripleTransAm]

Not to mention the potential for backfire, as I learned on my first Honda (the '84/'84 hybrid car we built in 1993). The vacuum dashpot on the carb was somewhat seized, and resulted in REALLY lazy RPM drop when de-clutching for an upshift. Very annoying, so I disabled the system... until I readjusted the carb's mixture, I would get a pop on too quick an RPM drop. One day I'll scan a photo of what the hood looked like after I got the car straightened out once and for all...

[MAD-3R]

Originally posted by TripleTransAm
One day I'll scan a photo of what the hood looked like after I got the car straightened out once and for all...

12 Gague or .45ACP?

[TripleTransAm]

Think "burned to a crisp". It's really cool the kaleidoscope of colors that basic Honda metallic silver will display after it's caught fire.

[MAD-3R]

Ahh... Napalm

[TripleTransAm]

Funniest thing was that I eventually was asked by my insurance company to send in a photo of the car since it passed the 10 year-old mark and get it inspected.

Getting it inspected wasn't a problem ;) but as for the photo, this was long before I had any sort of access to Photoshop or whatever they used back then. So I had to resort to some very creative photography. :)

We're digressing... sorry for getting off-topic.

[MAD-3R]

:lol: