20 Most Recent 2002 Jeep Grand Cherokee - Page 3 Questions & Answers

idle air motor dirty/bad.pull it clean pentle check screw travel when ignition switch cut on & off. if motor is bad replace I.A.M.

If the engine isn´t making any abnormal mechanical noises, then I would expect the oil pressure sending unit at fault. If however the engine does make more or abnormal mechanical noises, it could be a too low oil pressure and this should be addressed immediately.

If it's the 4.8 it's probably a head problem. The alluiminan the heads are made out of is like a powder that's molded together. Depending on how hot it has run it's probably ruined it. Sorry for the bad news If you need further help, reach me via phone at https://www.6ya.com/expert/grayson_15ffad3aaeb66fef

That sounds like a computer problem have you jumped anyone because that can hurt your computer in your vehicle hope this helps Merry Christmas

If the battery is dead it will not turn over .

might be good to be the engine shown as available in this vehicle - but just for a point to initiate problems resolution for - 2.4L/3.7L/4.0L/4.7L - get an idle air replacement gasket for future use - once it is has been running or has obtained some warm up temp - disconnect your idle air control valve wiring - see what effect it has on the motor -this will effect cold engine air bypass and air/fuel enrichment for the cold engine - if it is not opening and closing properly it will not start or run/idle properly - it can/will also cause you check engine light or codes - Also in this system is an ambient air temperature sensor - telling the computer the air/motor is cold and needs to enrich-en the fuel mixture as an old fashioned choke would do - I have no idea of the condition of the overall tune up on the engine so other items may also influence or prevail - such as dirty throttle body and fuel pressure regulator / filter or egr system issues - tough to do without specs. details - codes or vehicle history This is a US based gasoline jeep ? if diesel look at glow plugs or glow plug relay

I think you should go for manual first after that it will be easy for u to solve your problem. I had visited this site past 2 months before for my vehicle and find it quite helpful may be you will also get something useful here 2002 Jeep Grand Cherokee Service Repair Workshop Manual INSTANT DOWNLOAD

There's a problem with the immobilizer system. Take it to a reputable independent repair shop for diagnosis.

This is not an easy problem to solve at home for this vehicle. Far and away the most common cause of this issue is a faulty PCM (the vehicle's main computer). Did the vehicle just start dooing this all of a sudden with both keys? Or did it begin with one key not working and now neither works? There are several potential causes, but in my experience it usually a bad PCM, bad SKIM (anti theft module) or the SKIM needs to be reprogrammed. You are best advised to have it towed to the dealer or a reputable garage with experience in anti theft systems on Jeeps.

Could be module check with the dealer where is.

check ALL the grounds to the PCM. The main ones are at the starter and the fuse box for the battery... there are others. If this isn't you issue then get a rebuilt PCM for $200 with exchange The rebuilders need the VIN and odometer reading to make it happen for you. (Dealer is a rip-off.)

Fan relay or a temp sensor

I think, the bearing of the A/C unit jam and putting extra load on the engine or the belt that connects to the engine has dried out. Logically, A/C has no direct connection with the engine exhaust.

Have no idea. Check for fault code with a scanner first

Does it have a filter? may be plugged if so

I have replaced TPS - throttle position sensors on jeeps for this same problem ! Fixed them right up . But use jeep parts , not aftermarket ! Jeep's don't like aftermarket parts .