so... I have 99 neon DOHC
when I start the engine, it is running well, the RPM is norm. ~ 900-1000
but during the driving, when I shift the gear in neutral, (manual trans.) RPM doesn't slow down, it remains between 2000-3000 range
as soon as I stop the car, RPM returns on norm. :WHT:
I've cleaned the tdrottlebody, removed IAC sensor and clened it too. I've also clened the MAP sensor, jut in case, but they didn't help...
"chek engine" lamp is off, the diagnostic shows no trouble codes....
any suggestions??
:help:
n-gin
06-06-2006, 07:02 AM
When rpms are low disconnect the iac and see if your rpms stay low. You need air to rev so also check the vacume lines, manifold, and even the evap sys.
rice_eater
06-06-2006, 04:16 PM
Would you happen to be using A/C or defrost at the time?
dodgeneonACR98
06-07-2006, 12:55 PM
Would you happen to be using A/C or defrost at the time?
I bet he is!!!! If what Rice said is the case your AC needs a re-charge!!!! For some reason the idle does that if the AC is about empty. Good luck
gcc804
06-11-2006, 09:40 AM
I don't understand??? I am using A/C sometimes, but as I noticed it doesn't matter is it ON or OFF, the RPM is between 2000-2500 when I am driving and shift the gear in neutral....
as for the A/C, it doesn't need to recharge, i think.... the freezing cold air is coming out from when it is on :)
and what is evap sys. an where are the wacume lines?
n-gin
06-12-2006, 02:11 PM
Usually the evap system has blue and red connector at the purge valve. The lines go to the tank and the intake.
underdodge
06-15-2006, 12:11 AM
your alt belt is needs adj, mine did that when i through a belt and had to drive w/o it.
gcc804
06-15-2006, 07:17 AM
is alternator belt adjustible?? ;) ;)
dodgeneonACR98
06-15-2006, 12:54 PM
is alternator belt adjustible??
You are kidding RIGHT? yes they are adjustable,,,,you even have to change them sometimes!!!!! LMAO If you don't really know about this stuff I recomend you buy yourslef a good owners manual and read up on routine maint.
underdodge
06-15-2006, 01:43 PM
phewwwww!
rice_eater
06-16-2006, 06:16 PM
(jaw dropped.....)
donald7150
06-26-2006, 01:09 AM
lol
mine does this whenever i have the A/C or defrost on
the freon is just about gone so the compressor cuts in and out like evry second so the rpms are always up there until i come to a complete stop
come to think of it my '98 caravan does something similar when i coast in neutral
it will remain at about 1500 to 1600 even if I slow to a crawl, but returns to a perfectly normal idle when the speedo hits zero with or without the A/C on
gcc804
06-26-2006, 08:20 AM
so what have you done with your caravan? do you have "check engine" light on?
donald7150
06-26-2006, 09:35 AM
I havent done anything, no check engine light or anything it seems almost normal, but it doesnt flare up to 2-3000 only about 1500
n-gin
06-26-2006, 11:38 AM
Looks like I didnt see the forest or the trees on this one.
It is normal operation. The rpms stay up so that there is no harsh surge when you let off the gas at cruising speeds.
dodgeneonACR98
06-26-2006, 11:46 AM
Looks like I didnt see the forest or the trees on this one.
Are you into Maralyn Manson? LOL cant see the forest for the trees is in one of his songs, right b4 he say's you can't smell your own shit on your knees. UMM he's a sick individual.
rice_eater
06-26-2006, 04:11 PM
Are you into Maralyn Manson? LOL cant see the forest for the trees is in one of his songs, right b4 he say's you can't smell your own shit on your knees. UMM he's a sick individual.
:huh: ACR98, keep your Maralyn Manson fetish to yourself please, LOL.
donald7150--- Didnt you say you work at a stealership? oh i mean dealership? These things arent that difficult to figure out. there is a safety switch on the AC compressor that will not allow the compressor to engage when it is out of or low on R134. That is why it clicks on off on off on off etc... when you try to use A/C of defrost. That means that the majority of the time the clutch is NOT engaged, meaning there is no extra drag on the engine. BUT the PCM sees you have AC on, and compensates, even though the pump isnt actually being turned. This makes the engine hang on to revs, idle high, etc... Recharge your AC or dont use it. You can drill out the circuit board behind the HVAC panal so AC only comes on with defrost if you have the dial set on AC, instead of automatically. Theres a how to on neons.org. I did it, works well.
donald7150
06-26-2006, 05:50 PM
oh the pump cuts in and out trust me its very audible
before i charged it it never cut it at all but since i recharged it all the freon has leaked out again but it still cuts in and i hear a whistling/whining coming from the dash, i even has the system evacuated but it STILL cuts in, but the whistling has gone away
i have the leak fixed now and will be recharging it tomorrow
there isnt any figuring out to it i will just recharge it and everything will be back to normal :D
with regards to my van and the rpms i know its normal, i never really thought about why it does it but i know its supposed to
the neon is the same way
dodgeneonACR98
06-27-2006, 04:21 AM
ACR98, keep your Maralyn Manson fetish to yourself please, LOL.
No fetish here! Maybe I worded that a little wrong LMAO! He's a sick MO-FO.
n-gin
06-27-2006, 07:00 AM
Every now and then I tune in to M.Manson.
rice_eater
06-27-2006, 10:34 AM
Every now and then I tune in to M.Manson.
You are disturbed. :crazy:
donald7150-- Your neon hanging onto revs is not normal, its cuz your AC was low/empty. I went throught the same thing last year, thats how I know. Once you charge it up it will be fine.
donald7150
06-27-2006, 10:41 AM
when the a/c was on and low it would hang at 2-3000
but with it off when i would put the clutch in when the rpms were up it would drop to about 1400 or a bit below until i stopped then would return to about 900
dodgeneonACR98
06-27-2006, 01:23 PM
Wow! I feel for you then N-Gin LOL. JK
rice_eater
06-27-2006, 05:04 PM
when the a/c was on and low it would hang at 2-3000
but with it off when i would put the clutch in when the rpms were up it would drop to about 1400 or a bit below until i stopped then would return to about 900
I can see why it would hang on to revs with the AC on when the system is low, but as for it hanging onto revs with the AC off.. hmmmm. Dont think its normal, mine doesnt do it anyway. How fast is the engine turning when you push in the clutch? If i hit the clutch letting the engine drop from a high rev (say 5000+rpm) it kinda does a double step, and catches momentarily at around 1500rpm, then drops to idle. Nothing like you are describing though. Pushing in the clutch at normal speeds (say 35mph @ about 2500rpm, 3rd gear) and the engine drops directly to idle, 900-1000rpm. Maybe you have a slight vacuum leak somewhere?
n-gin
06-28-2006, 02:34 PM
Do you have a manual trans or auto? If it is auto it will hang on to about1200-1500 revs. If manual 900-1300. Any more and you have a vacume leak. You need air to rev.
Yes, Disturbed is a good group too. I like Disturbed more then MM, and Eminem is good too. :D
donald7150
06-28-2006, 03:08 PM
its a manual, but im not sure if its as high as i origionall said i could still be thinking about the caravan, i have to work tonight and will be using the car for work so i will watch it to make sure as i never paid much attention to it
