Hi all

 

Continuing fast idle problem. (uk TT auto)

After previous post, (cleaned TB's 3-4 weeks/1500 miles ago) and idle has been around 1000rpm since.

 

I acted on the advice last given and cleaned the idle control valve thingy today. I reset the ECU (disconnected battery for 1.25 hours. I initially removed the two plugs from ECU but as engine still started, I didn't know if they were the right ones so played safe with battery disconnection too).

I also cleaned the TPS connectors while waiting for good measure.

 

Anyway when all done, I started the car and let it warm up.

Woohoo, approx 700rpm idle:)

I went for a drive of 3 miles or so and when I got home and put gear into park it went back to 1000rpm:mad:

 

Any suggestions or should I get Nissan to rest it?:confused:

Your ecu will be in it's learning mode so it'll take a few hundred miles before everything settles down :)

 

Vijay

Thanks Vijay,

 

I'll leave it for a few weeks and see what happens

clean the TPS connector terminals again - scrape any green oxide with a very small screwdriver plug and unplug a few times carefully and wiggle the wiring under the tps when its running at 1000rpm+ You'll know your near the problem when it drops to normal. Mines still does this from time to time.

Stop messing around and just buy a new TPS. I did this two weeks ago and it solved very one of my engine niggles. I also installed an new IAA unit for good measure and now my Zed is idling as smooth as can be.

 

Each case is unique of course and my TPS connectors took a hell of a lot of cleaning but with the new unit, my old thunder is sweeeeeeet once more. Can`t wait until it comes out of its wrappers next year to try it out on the road.

Richard,

 

You've done good cleaning all connectors, TBs and Idle Valve. One more thing to throw into the equation is the actual TPS value. It should be set somewhere between 0.40V - 0.44V. If the TPS is old it the value may fall outside of this range and cause the throttle circuit to close which in turn raises the rpms. Use a multimeter, or better still a ConZult (available at DTA-Motorsport.co.uk) to check the TPS value and then make adjustments accordingly. It should be set just before the throttle circuit closes, which may be anywhere between 0.40V - 0.44V.

 

I recently helped another member on this forum to check his TPS value using my ConZult and found it to be set at 0.28V. Now, this was surprisingly the correct value as 0.30V was the point at which the throttle circuit closed. Over time the TPS wears and the value changes. This particular car was reacting slow to throttle input but was behaving correctly indicating that the actual TPS value is not too relevant. It is the range of voltages that is relevant.

 

Sorry for babbling on. My suggestion is (a) check your TPS value and (b) get a new TPS (only about £37 + VAT from Nissan).

 

Good luck and let us know how you get on.

 

Regards,

Thanks for advice, all:)

 

The TPS connectors were actually quite clean before I took them off. There was a little engine grime but no green oxide or anything needing a good scrub (I only needed to wipe them with kitchen towel and spray with WD40)

 

I'll try the test recommended by Danny and get a new TPS if needed.

 

Richard:)