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Hi Patty: I have a 2000 Nissan Xterra with 183,000 miles. It has run really well up till now. The Xterra has started to idle erratically and when you try to go from a stop, the rpms drop from around 1100 to 500 and the car feels like it is going to stall. I had a tune up done, which did not help the situation. The mechanic I went to connected my vehicle to a code reader and said that error codes showed a throttle issue, a transmission code, and a knock sensor error. I am thinking my throttle body and throttle control module might be buggered, and perhaps some other things too. Any suggestions on what I need to get fixed NOW and what I might pay to have the work done? Thanks!

Answers from the Automotive Experts

Amanda J. Pierce, MBA Adrienne, Your throttle control module is a great start, also your idle air control valve can be removed and the head can be cleaned of excess carbon. These two items can give you a clear idea of reason of deduction. If you have not done so, a fuel system cleaning can serve you well also.

Audra Fordin, Owner at Great Bear Auto Shop HI! If a tuneup had not been done in a while, it makes a lot of sense to do it. Thi,s as you can see was needed maintenance, not to cure your trouble. The knock sensor listens for the "knock" of the engine and is related to the emissions. The transmission code is related to the transmission. The throttle is where you need to focus on to fix the PRM's. As for pricing, www.repairpal.com is a great site for estimating cost. It is not always 100% but, 85% of the time it is. Take a deep breath, and focus on one code at a time. Mechanically yours, Audra www.womenAUTOknow.com

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Adrienne, Getting the codes is a good thing, now you know where to look. I would suggest that you get a good technician that will use the scan tool to narrow down your problem. A technician who can read codes and one who can fix them can be very different. Replacing the items you've found that are giving you codes may be costly and unnecessary. Sometimes one problem can be the source of the others. Find a good tech that can properly test and diagnose your problem. You can check for an Ask Patty women friendly shop by you on the Ask Patty website or check http://locator.ase.com/blue/ for ASE certified technicians near you. Good luck. Lori Johnson www.ladiesstartyourengines.com

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