Why does my 2003 Dodge Grand Caravan idle smooth in drive with A/C on, but not with A/C off?

20

Asked by May 06, 2017 at 11:34 PM about the Dodge Grand Caravan

Question type: Maintenance & Repair

My 2003 Dodge Grand Caravan idle smooth in drive with A/C on, but not with A/C off.  I have 296,000 miles on it.  At a stop light, the RPM goes from 700 to below 600 in drive.  When it gets near 600, it starts to idle rough.  If I hold the break and just tap the accelerator lightly, it will start idling smoothly again at around 700 RPM.  I have spent many hours and months trying to trouble shoot this problem; are there any suggestions?

7 Answers

230

When you turn on the AC the compressor rise the engine rpm.but when you turn off the vehicle will stall because need tuneup and use clean injectors you will see some different.

5,355

scan for codes even if the light ain't on

20

All of that has been done.

1 of 1 people found this helpful.
20

Engine does not stall; it only run rough when the RPM lower to 600 RPM and lower in drive. There are no codes. Tuneup was recently done and bad injectors replaced and then cleaned. Here is another part of the puzzle. Engine idle smooth in reverse, neutral and park.

5,355

intake leak ? get starting fluid around gaskets and see if idle changes , check for worn/cracked hoses and vacuum lines

20

I was thinking the same thing; I tried carburetor cleaner, brake cleaner around all area I could reach with the engine running. No change in RPM. I think I can hear a leak when I accelerate hard up to 80. I will check under van soon for vacuum leak, but is too afraid to have the engine running at the same time. I don't have a smoke machine.

1 of 1 people found this helpful.
5,355

take the tension off the serp. belt and see if the A/C pulley turns freely engine off .

7 of 7 people found this helpful.

Your Answer

Grand Caravan

Looking for a Used Grand Caravan in your area?

CarGurus has 34,893 nationwide Grand Caravan listings starting at $1,900.

ZIP:

Dodge Grand Caravan Experts

  • #1
    Tom Demyan
    Reputation
    2,860
  • #2
    dandyoun
    Reputation
    970
  • #3
    Dan Connell
    Reputation
    650
View All

Related Models For Sale

Used Chrysler Town & Country
169 Great Deals out of 13,853 listings starting at $1,995
Used Honda Odyssey
386 Great Deals out of 31,793 listings starting at $1,990
Used Toyota Sienna
379 Great Deals out of 20,621 listings starting at $1,695
Used Dodge Caravan
554 listings starting at $2,295
Used Chrysler Pacifica
89 Great Deals out of 27,144 listings starting at $750
Used Kia Sedona
102 Great Deals out of 7,475 listings starting at $2,300
Used Dodge Journey
530 Great Deals out of 36,245 listings starting at $2,218
Used Nissan Quest
61 Great Deals out of 2,756 listings starting at $2,500
Used Dodge Durango
282 Great Deals out of 25,053 listings starting at $1,500
Used Chevrolet Traverse
718 Great Deals out of 34,207 listings starting at $3,900
Used Ford Explorer
1,154 Great Deals out of 68,497 listings starting at $1,200
Used GMC Acadia
871 Great Deals out of 44,542 listings starting at $3,500
Used Chevrolet Equinox
1,069 Great Deals out of 78,025 listings starting at $2,222
Used Chevrolet Tahoe
852 Great Deals out of 40,103 listings starting at $1,900
Used Honda Pilot
622 Great Deals out of 38,025 listings starting at $1,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.