High idle speed [Archive] - B15sentra.net - Nissan Sentra Forum

: High idle speed


Srd555
01-07-2003, 06:46 AM
For the last two days my car has been idling at 1200 rpm. Has anyone seen this problem?

Some back ground info:

I did a search and came up blank.

It has been about 50-60 deg here in Miami for the last two days. I thought that had some thing to do with it, but know I dont think so. My cooling fans come on but still the idle never drops below 1200. There are no error codes in the computer and every thing else seems to work properly. I also have a stock intake.

Does anyone have any ideas?

I have to get time off of work to go to the Dealer but I just came back from a vacation so that'll be hard.

02 se-r spec v
01-07-2003, 07:01 AM
lets your engine temperature go up about half way, my idle is about at 1200 when not warmed up.

Srd555
01-07-2003, 07:12 AM
Originally posted by 02 se-r spec v
lets your engine temperature go up about half way, my idle is about at 1200 when not warmed up.

It does warmup. The cooling fans come on to cool the car back down. I have a PDA OBD II scan tool and it reads the temp at 197 deg. F before the fans come on ( normal).

brywards
01-07-2003, 07:35 AM
Do we have any kind of Idle Air Control valve that could be stuck/clogged?

david
01-07-2003, 08:09 AM
Most Nissan engines are designed to have a high idle till they reach a certain temp. They should come down after a few mins.

Srd555
01-07-2003, 08:16 AM
Originally posted by david
Most Nissan engines are designed to have a high idle till they reach a certain temp. They should come down after a few mins.

I drove the car for 1 hour yesterday at 40 miles an hour and I drove 10 miles this morning for work and still the Idle did not come down. This is from a car that normally warms up by the time I get about a block from my house.

brywards
01-07-2003, 08:22 AM
Dude, there's gotta be a clog somewhere, or something is making your ECU think that it's too cold or maybe that the fuel mixture is too lean.

david
01-07-2003, 08:25 AM
Have you done any mods to your car recently. It sounds like a vaccum line is possibly not connected.

Srd555
01-07-2003, 08:25 AM
Originally posted by brywards
Dude, there's gotta be a clog somewhere, or something is making your ECU think that it's too cold or maybe that the fuel mixture is too lean.

So I guess its dealer time. Crap!!

Srd555
01-07-2003, 08:35 AM
Originally posted by david
Have you done any mods to your car recently. It sounds like a vaccum line is possibly not connected.

I have done nothing to the car but change the oil and put in gas. This problem started yesterday morning. I going to see if a vaccum line might have broken .

Thanx

Srd555
01-08-2003, 06:45 AM
Well, I took the car to the dealer yesterday to have the idle issue looked into. After 3.5 hours they still have no idea as to what is causing it. The first thing he suspected was the computer, so he replaced it with one from another car. Still no go.

Then he came back and said the idle timing is retarded 10 deg. (it sits at 4 deg instead of 15-16). Possible cause is, get this, I am driving the car too hard. So I informed him that short of hitting the timing chain with a hammer there is no way I would be able to move the timing that far back. I also told him that if the car was retarded that much I would feel a loss of power, and I don't, the car is faster now than it has ever been. He didn't believe me so I took him for a ride with his consult II, and sure enough all the other rpm vs. timing maps were in spec.

I conclusion I have to take the car back to them today and leave it indefinitely until they can find the problem. They mentioned getting a specialist to come look at the problem. I am screwed :(

P.S.
when I went in and told them about the problem, the mechanic went directly to my Intake system and started to check the screws to see if I had tampered with them. I played stoopid and ask what he was looking for, he said that people have been screwing up the cars with cold air intakes and putting the stock one back when they come in for work. He saw that mine was never touched.

Srd555
01-13-2003, 06:20 PM
I just got the car back today. It has been at the dealers since 01/7/03 for a high idle problem.

RECAP

Problem:

The car would idle at 1200 1500 RPM even after it warmed up. When hooked to the consult II the only parameter that was out of spec other than the idle was the idle timing. This timing was 4 degrees when it should have been ~15 degrees. There was no SES light on.

Cause:

There is a power steering switch (49761-5M010) on the power steering pump that was shorted. Its function is to bring up the RPM when you move the steering wheel around. In its shorted state it tricked the ECU into thinking the steering was being moved around.
Before the BS flag is raised, know that I was present when the problem was found. I was the one that led the mechanic to the problem (he was stomped). I remembered I had a somewhat similar problem with my Subaru a couple years ago. We found the problem on the 8th, but the switch was on national back order :(

I did a search on all Nissan forums to see if anyone else has had this problem, I found one
http://forums.thevboard.com/viewtopic.php?t=7242&highlight=

I hope this helps others in the future.