Cold start: low idle then jumps up to normal 1800rpm

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tjrob2000
Posts: 73
Joined: Sat Jun 07, 2014 5:42 pm
Car: 2007 G35 sedan (journey)

Cold start: low idle then jumps up to normal 1800rpm

Postby tjrob2000 » Sat Sep 21, 2019 4:42 am

'07 G35 Journey sedan.

The last 3 days the cold start is not normal. It starts fine, but the idle rpm's are in the 500 range for the first few seconds then come up to a normal 1800rpm before decreasing to 650rpm. No work has been recently done other than an oil change about 3 weeks ago. Car runs normally with good power when warm. Outside temp doesn't matter. Cranking speed sounds ok.

Tom


mdmellott
Posts: 122
Joined: Mon Sep 02, 2019 3:32 pm
Car: 2002 Pathfinder SE 4WD

Re: Cold start: low idle then jumps up to normal 1800rpm

Postby mdmellott » Sun Sep 22, 2019 3:31 pm

Your spark plugs could be getting worn out, maybe. TPS could be set wrong, maybe. Fuel pressure regulator may be going bad. I know, too many maybes. Hard to make a differential diagnosis without more symptoms.

tjrob2000
Posts: 73
Joined: Sat Jun 07, 2014 5:42 pm
Car: 2007 G35 sedan (journey)

Re: Cold start: low idle then jumps up to normal 1800rpm

Postby tjrob2000 » Thu Sep 26, 2019 4:10 am

Spark plugs are brand new along with air filters. Forgot to mention this in my original post. I would expect a fuel pressure regulator to impact normal running as well which is not the case.

tjrob2000
Posts: 73
Joined: Sat Jun 07, 2014 5:42 pm
Car: 2007 G35 sedan (journey)

Re: Cold start: low idle then jumps up to normal 1800rpm

Postby tjrob2000 » Wed Nov 06, 2019 9:04 am

This issue has gone away, possibly due to replacing the ground cable.


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