Engine revs?

Tiny
HVD
  • MEMBER
  • 2 POSTS
  • 2002 DODGE CARAVAN
  • 6 CYL
  • FWD
  • 118,000 MILES
2002 caravan 3.3l no past trany problems. At about 40 mph the engine over revs and it feels like it is not shifting, although I can get up to speed. Do you suspect an electrical or or sensor problem to the transmission? I have approx. 118,000 mi. Check engine light is on. No problems with shifting between p r n d. Thanks much
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Sunday, July 26th, 2020 AT 12:45 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Is it slipping(free reving)or just stuck in too low a gear?
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Sunday, July 26th, 2020 AT 12:45 PM (Merged)
Tiny
HVD
  • MEMBER
  • 2 POSTS
Not sure. It revs as I give it more gas. And yes it seems like it is stuck in gear. I can go as fast I would like but the engine revs over 40 mph. Ive had it up to 80 or so in that condition but I dont want to damage the tranny

thanks a lot!
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Sunday, July 26th, 2020 AT 12:45 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Can you get codes from CEL read?
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Sunday, July 26th, 2020 AT 12:45 PM (Merged)
Tiny
SLACK1989
  • MEMBER
  • 2 POSTS
  • 2001 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
When starting on cold mornings (32 or below) the engine starts as if the gas pedal is held to floor without touching the pedal. Rpm's return to normal right away but engine sounds like something is going to fly apart right after starting. It is going to throw a belt or something. I am afraid to start it on cold mornings. Starts normal all other times. I suspect a sensor or idle control, but have no engine light. Can this be adjusted? The rpm's rev up to 4000 or more before it backs off. This can't be good.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SLACK1989
  • MEMBER
  • 2 POSTS
My idle is normal. On cold mornings, well below freezing, the engine goes to wide open throttle then drops to normal fast idle. Does this on it's own without touching gas. Going to throw a rod one of these days.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The idle air control valve sends input signal to the computer so it can target the idle speed this is not happening-I recommend you clean it out and see what happens. If it continues replace it
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SHERMDOG
  • MEMBER
  • 2 POSTS
  • 2001 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
My Caravan seems to run fine for the most part. It is only when I reach speeds of 55 or 60 mph and I try to pass something the engine revs up and the rpm gauge is reading between 55000 to 60000 rpms (almost redline) before it finally settles back out. I am not unnecessarily stomping the gas pedal to the floor or anything like that. Also not sure if this is related to the same problem but the radio has died and all I see are two equalizer lights blinking on and off constantly when there is power to the radio. Any idea what this could be?
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check fuses for the radio would be a 1st step
do you have check engine light on and if so get the codes
let me know
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SHERMDOG
  • MEMBER
  • 2 POSTS
I checked the error codes but unfortunately I had disconnected the battery terminal in hopes that it would reset the radio. It didn't. The only error codes that it gives me now is a P1684 - the battery terminal was disconnected within the last 50 starts. When I find out more I will let you know. Thanks for your help.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
For all practical purposes, your radio is not repairable. You have either the cassette version or the cd version AM / FM radio. These are built by Chrysler with a microprocessor made by North American Philips, (NAP), the same people who make the really crappy Magnavox and Philips tvs. These microprocessors have a 100 percent failure rate. I have the special equipment to replace them, but then the software has to be "burned in" for the specific application. They will never sell me the expensive equipment to do that.

There is a list of about 30 different symptoms these radios develop, from going dead for five seconds when moving a tone control, loss of volume, no response when changing stations, etc. But by far, the most common symptom is flashing yellow leds in the tone controls, a thumping in the speakers, and the radio is dead. I have about 20 of these here already. The only difference from your description is all the radios I've ever seen with these problems have three tone controls, not two. If yours indeed has only two tone controls, I'd like to know the model number so I can add it to my list.

The good news is there are other radios built by Mitsubishi that are very high quality and are a direct replacement. There is one model of cassette player that has the same three tone controls with yellow leds, looks exactly the same except it has one extra button for "Scan", uses the same plugs, and will run the same optional cd changer. These sell for around $70.00 on eBay because used car dealers all over the country are looking for them to fix cars on their lots.

This is also a good time to upgrade to a cd / cassette combo. These are built by Mitsubishi too, and they look the same and run remote cd changers too. They typically sell for $175.00 to $225.00 which is considerably less than the cost of repairing a cassette player through the authorized service centers.

The higher end cd-only units are mostly built by Alpine. They have a lot more trouble than the Mitsubishi radios, and Alpine will not allow the repair centers to sell me parts or service manuals. I can still fix them but it takes longer.

It is quite common for radios like yours to develop problems when something else happens such as disconnecting the battery or having a charging system problem. My feeling is the other problem did not cause the radio failure, but it might have hurried it up a little. Most of these radios didn't last this long either; almost all have failed by now. You have to watch what you buy for a used one because you don't want to get another one that has the same problem.

The Mitsubishi radios are much higher quality than anything you'll find in the aftermarket, and they're pretty easy to replace. No silly programming is required like on GM cars. If you can't find a suitable replacement, holler back for more information. I sell and repair these at the nation's second largest old car show swap meet, and I repair them for dealers around WI.

Caradiodoc
caradiodoc@verizon. Net
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
JAYLEEN FLANIGAN
  • MEMBER
  • 1 POST
  • 2001 DODGE CARAVAN
  • AUTOMATIC
  • 180,000 MILES
Sometimes it runs no issue.

Check engine light is not on it was on over a month ago within an emissions control error, local shop did a tune-up and upkeep overhaul.

It sporadically revs at idle up to the 3000 mark for a couple seconds then drops back down to normal.
When first starting and changing gears it bogs way down, the dash lights go dim, and the engine stalls.
When driving and the rpm's start jumping the vehicle starts to buck.

Does have a store-bought locking gas cap.

Any ideas on what may be wrong and is it safe to drive?
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides and IAC hole with choke cleaner the make sure battery terminal ends are clean and free of corrosion. You should have belt and tensioner checked as recommended replacement is 60,000 miles for both as tensioner loses tension and belt has to be checked with a gauge not cracks.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SUETEDDY99
  • MEMBER
  • 3 POSTS
  • 2000 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 71,000 MILES
Very recently my minivan has been acting up. When I am going 30 and above the rpms don't go back down. So if I am driving at say 40 mphs the rpms stay at about 3000 or above rpms. When I am coming to a stop the rpms do go back down to normal. When I am backing out of my drive way and go back into drive the van jerks alittle. My step dad thinks it a sensor for the rpms. Is he right?
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
WHITELIGHTNINGCARAVAN
  • MEMBER
  • 2 POSTS
Check and see if your transmission is shifting, if not there are several things it could be. This has happened to me a couple of times and in both cases it was a damaged speed sensor on a wheel. If you have recently driven in muddy conditions it can happen. I often drive on gravel roads so I have come to expect it from time to time. Could be other sensors as well. If you have regular maintance and care for the transmission I wouldn't expect a something major there. Is there a check engine light? There should be in the case of a speed sensor.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SUETEDDY99
  • MEMBER
  • 3 POSTS
No it's not shifting it's keeping the rpms high when I am going 30 or above they go up to 3000 and I am able to drive it even up to 55 mph and the rpms are at 4000. Yes the check engine light is on. When I put it in reverse to back up and then I put it back into drive the van bucks a little.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
SUETEDDY99
  • MEMBER
  • 3 POSTS
Yes I get the regular mantance done. Step father thinks its the rpm sensor. Is that hard to fix?
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)
Tiny
WHITELIGHTNINGCARAVAN
  • MEMBER
  • 2 POSTS
Sounds like speed sensor. Both times I had the issue I took it to a mechanic, had the code read and fixed. Repair expense was <$150 for me. Don't know about the rpm sensor.
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Sunday, July 26th, 2020 AT 12:46 PM (Merged)

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