I bought an '02 Xterra, 2WD with 87K miles on it, and now has 89K - my fourth SUV. There are two things I've never encountered in any other car:
1. There is a switch on the auto-shift post, which on my old 1990 Stanza was a lock. On the Xterra, it initializes a dash light that says O/D Off, and I can feel a drive power reduction when I set the switch. I assume it means I shut off overdrive, but it strikes me a strange, nonetheless.
2. I got a Service Engine Soon light a few days ago, and I have no idea how bad the news is from that ambiguity.
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Re: O/D ON indicator
The light is just a OD indicator as u said, and the switch does operate the overdrive on/off function, many cars and trucks have this OD dis-able to aid in towing, using OD while towing can overheat the transmission, as far as the check engine light goes it can be caused by over 100 different malfunctions, have the system tested for the trouble code that is stored when the light comes on, Kragen auto and others do this for free.
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yes great car /truck they just eat front ball joints cant keep them in good shape 2wd and 4 wd same problem i do not care if you install the best/ or the cheepest they will not last more then 30,000 miles i have always pit the cheep ones in with a jurk fitting so i can grese them and i grease them every 2 mouths this seams to help the jimmy bravada and the blazer are all the same my mouther has the blazer i have the bravada and my son has the gmc jimmy and i have owned blazers and jimmys my self all of them recived ball joints now the onley other thing i can tell you if you get one of thies get the ainti frezse changed and flush it out very good put the green stuff back in the orange eats up the intake and head gaskets make shure that you get all of the orange coolant flushed out as the green will not mix with the orange and will plug up your heater core
Check for a loose wire around the ignition. Also the ground wire from the engine to the body. The steering should not actually lock up, but will be very hard to turn when the engine stops. I assume it idles and starts fine?? But it shouldn't! Frankster016
Changing the plugs is a good idea. The pcv, pop it out and give it a shake, if it 'rattles' put it back in. Now with starting fluid, check for a vaccum leak around the intake. Do this with the engine at idle speed, it will pick up when you hit the spot. Install the gasket or replace the hose that fell off, Way ya go! Frankster016