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Discussion Starter · #1 ·
On my 02 XE with 72000 miles on, the throttle body was changed last week because the MAF sensor went out. That sensor is not available separately from Nissan. Engine runs fine now, and there are no more codes in the PCM; however, the idle speed is slighltly high, between 900 and 1000 rpm when in Park or neutral and a fully warm engine.

1. Assuming that everything else is OK, what is the easiest way to turn down the idle?

the AC was recharged 5 months ago after discovering a leaking O ring at one of the hoses fittings that was fixed. I have not been using the AC since then, but now it puts out ambient air again, while the compressor engages ON when I press the AC button.

2. Could there be another leak that needs fixing before another recharge, or am I looking at more serious trouble?

TIA,
Val Barone
 

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for the idle, you need to get an fsm. It has detailed steps on how to set the idle speed.
 

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The FSM is available in our DIY section...

Heath
 

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Discussion Starter · #5 ·
I have read the complete procedure in the Factory Service manual; however, since I am assuming that the shop that replaced the throttle body initially verified that everything else is OK; as I said, I see no fault codes, and I would hate to take the truck back to the shop so that they just move a screw less than a turn and resolve the issue.
I think I could just do that myself, and save time.

As far as the AC kit from Amazon, does that kit help you find a possible leak, or am I just assuming that, once serviced, it will be OK this time? When I bought the truck 6 months ago, they found and fixed an O ring leak, serviced it, and it was doing fine. So I am thinking that there must be another leak somewhere.

Val Barone
 

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Discussion Starter · #7 ·
There should be no reason for me to redo the procedure; it takes the Nissan Consult II equipment to go through all the checks, which shoud have already been done, and, of course, I do not have that $$$$ equipment, or I would be working at a dealership. I checked all possible places for vacuum leaks and can't find none; the idle speed is smooth, but just a tad high.
So, I am looking for the quick and easy way for the adjustment. I know that there are no stop screws to adjust at the throttle, but I am sure there is a way to turn the idle down without affecting the rest of the injection system.
What would that be?

Val Barone
 

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I don't know what fsm u have. On mine it lists three ways of adjusting the idle. One is with a consult, the second one is with a generic obd reader, and the 3rd is with no obd scanner or consult.

Basically you have to make sure your truck is warmed up to operating temp. Then make sure your timing is set. After that is done, then you disconnect your tps, rev the truck three to four times, let the idle settle and make your adjustment.
 

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I have read the complete procedure in the Factory Service manual; however, since I am assuming that the shop that replaced the throttle body initially verified that everything else is OK; as I said, I see no fault codes, and I would hate to take the truck back to the shop so that they just move a screw less than a turn and resolve the issue.
I think I could just do that myself, and save time.

As far as the AC kit from Amazon, does that kit help you find a possible leak, or am I just assuming that, once serviced, it will be OK this time? When I bought the truck 6 months ago, they found and fixed an O ring leak, serviced it, and it was doing fine. So I am thinking that there must be another leak somewhere.

Val Barone
Unless your mechanic is going to make things right at no extra cost to you, I would get a kit or at least go to Walmart and pick up a bottle with the hose adapter and add some fluid. Add some fluid and see how long it last. The mechanic could have been stingy with the fluid. It would be cheaper to add some fluid than pay the mechanic full price.
 

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If the idle was OK before the throttle body was replaced, and then high afterwards, why would you assume that it was set properly by the installer? I would take it back and have them set it correctly.

As far as the A/C, you're obviously leaking refrigerant somewhere. If UV dye has been installed in the system, you should be able to locate it with special glasses and lighting. If not, you'll need a "sniffer"

Recharging with that fast of a leak is going to be a constant battle keeping the refrigerant at optimal levels...

Heath
 

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Discussion Starter · #11 ·
If the idle was OK before the throttle body was replaced, and then high afterwards, why would you assume that it was set properly by the installer? I would take it back and have them set it correctly.

As far as the A/C, you're obviously leaking refrigerant somewhere. If UV dye has been installed in the system, you should be able to locate it with special glasses and lighting. If not, you'll need a "sniffer"

Recharging with that fast of a leak is going to be a constant battle keeping the refrigerant at optimal levels...

Heath[/QUOT

Well, thinking I might have a vacuum leak around the throttle body, I removed the air cleaner housing to look; nothing amiss, except that the shop has put in an old throttle body and charged me for a new one. I sent them a nasty gram and they are admitting that the the part is old but forgot to inform me before installation. Nice try, I said, but I want a new one; so, they will call me when it gets in. no sense in horsing around adjusting a used throttle body when a new one will fix the problem.
The AC repair will come after that, and certainly not at the same shop, obviously.
Thanks again to you and all for the tips so far.

Val Barone
 

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ask them how much they want for the old throttle body!!! i will buy it off u....
If the idle was OK before the throttle body was replaced, and then high afterwards, why would you assume that it was set properly by the installer? I would take it back and have them set it correctly.

As far as the A/C, you're obviously leaking refrigerant somewhere. If UV dye has been installed in the system, you should be able to locate it with special glasses and lighting. If not, you'll need a "sniffer"

Recharging with that fast of a leak is going to be a constant battle keeping the refrigerant at optimal levels...

Heath[/QUOT

Well, thinking I might have a vacuum leak around the throttle body, I removed the air cleaner housing to look; nothing amiss, except that the shop has put in an old throttle body and charged me for a new one. I sent them a nasty gram and they are admitting that the the part is old but forgot to inform me before installation. Nice try, I said, but I want a new one; so, they will call me when it gets in. no sense in horsing around adjusting a used throttle body when a new one will fix the problem.
The AC repair will come after that, and certainly not at the same shop, obviously.
Thanks again to you and all for the tips so far.

Val Barone
 
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