How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jake Your Own Question
Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 3903
Experience:  Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
20440119
Type Your Nissan Question Here...
Jake is online now

Hi. I'm in the UK and have recently purchased a used 2011 (registered

Resolved Question:

Hi. I'm in the UK and have recently purchased a used 2011 (registered March) Nissan Qashqai 1.6 Acenta. I have noticed that if the engine has not been started for several hours that initial revs at idle are approx 1700 RPM . This settles to approx 750 idle after driving the vehicle for approx one minute. Is 1700 normal? This is consistently happening at fairly warm outside air temperatures -f 25C (77F) being the most recent for example. 1700 seems a bit high to what I'm used to. The car has a one year warranty which I could claim on. I'm just not sure if this is a fault, or an expected engine management characteristic.
Submitted: 2 years ago.
Category: Nissan
Expert:  Jake replied 2 years ago.
Jake :

hi there

Jake :

1700 RPMS for a cold idle is considerable high

Jake :

On initial start the engine should generally rev to about 1200-1500 RPM's and then taper down immediately to around 900 rpms while the engine warms up.

Jake :

then warm engine idle of 750 is perfect

Jake :

let me know how else I can help please.

Customer: replied 2 years ago.

On initial start the engine should generally rev to about 1200-1500 RPM's and then taper down immediately to around 900 rpms while the engine warms up.

Thanks Jake. If you could just clarify for me please:

You say the revs should immediately taper down to 900....Are we literally talking just a few seconds? At idle with no fan or air con, mine drops from 1750 to 1500 after 10-15 seconds approx . It takes a further 50 seconds approx to ramp down to 900 rpm.

Expert:  Jake replied 2 years ago.
Yes, 5-10 seconds max.
Then RPM's will be just slightly higher than normal (about 900) until the engine is fully warmed up and idling at 750rpms.
Your idle is too high.
Jake and other Nissan Specialists are ready to help you