I have a 2003 Jeep Overland with a 4.7 HO engine. When I am driving around 60 MPH the RPMs fluxuate between 1500 to 2000. the RPMs GO UP THEN DOWN THEN UP THEN DOWN. IT FEELS LIKE A VACUM LEAK OR THE TRANSMISSION DISENGAGING BRIEFLY THEN CATCHING AGAIN.This does not happen at idle. I have an emission diagnostic code of PO 325 suggesting possibly a bad knock sensor or weak air fuel mixture. What do you think might be going on ? Thanks Dan

Asked by Dec 14, 2014 at 12:16 AM about the 2003 Jeep Grand Cherokee Overland 4WD

Question type: Maintenance & Repair

see question

1 Answer

86,405

P0325 is a knock sensor code, could be a sensor malfunction or a bad sensor, the RPM fluctuations sounds like you are shifting in and out of lockup in the transmission, could be a speed sensor misread, but fix the hard code first then go from there, don't forget to clear the ECM after the repair is completed.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Jeep Grand Cherokee Questions

Jeep Grand Cherokee Experts

#1 inuevafreak
inuevafreak
Reputation 1,910
#2 Tom Demyan
Tom Demyan
Reputation 1,750
#3 thejeepdoctor
thejeepdoctor
Reputation 1,610
View All

Related Models For Sale

Used Ford Explorer
1,006 Great Deals out of 73,800 listings starting at $750
Used Jeep Wrangler
441 Great Deals out of 19,188 listings starting at $2,994
Used Toyota 4Runner
328 Great Deals out of 20,882 listings starting at $1,990
Used Dodge Durango
330 Great Deals out of 24,233 listings starting at $1,500
Used Chevrolet Tahoe
808 Great Deals out of 28,674 listings starting at $1,500
Used Ford F-150
2,880 Great Deals out of 212,656 listings starting at $1,000
Used Chevrolet Silverado 1500
2,304 Great Deals out of 156,238 listings starting at $1,395
Used BMW X5
442 Great Deals out of 15,323 listings starting at $2,900
Used Jeep Liberty
273 Great Deals out of 8,217 listings starting at $1,200
Used Ford Mustang
396 Great Deals out of 44,403 listings starting at $1,000
Used Honda Accord
887 Great Deals out of 82,090 listings starting at $999

Used Cars For Sale

2017 Jeep Grand Cherokee Overland 4WD For Sale
3,936 listings starting at $37,217
2016 Jeep Grand Cherokee Overland 4WD For Sale
246 listings starting at $34,595
2015 Jeep Grand Cherokee Overland 4WD For Sale
7 Great Deals out of 369 listings starting at $26,300
2014 Jeep Grand Cherokee Overland 4WD For Sale
20 Great Deals out of 706 listings starting at $20,988
2013 Jeep Grand Cherokee Overland 4WD For Sale
10 Great Deals out of 198 listings starting at $16,985