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2003 LE Struggles at start

 
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krieg17



Joined: 02 Jun 2019
Posts: 8

PostPosted: Sat Mar 28, 2020 3:08 pm    Post subject: 2003 LE Struggles at start Reply with quote

Hi all, just wanted to see if anyone has a quick first step maybe for this issue?

Issue is that upon cold start, it fires great, then immediately dies. So basically...I have to give it gas upon starting, and after a couple seconds of giving it some gas i can let it idle and it's perfectly fine. It also has zero issues while driving or idling after this. It can start fine when warm, but occasionally the warm start struggles for a few seconds too. Seems like it's not getting the proper air flow at first or something. As if it was fuel filter or something i'd assume it would have problems more than just at start.

MAF sensor maybe and check air filter? Any other suggestions? Any thoughts on this, as always, are appreciated!!!

Thanks,
J
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smj999smj
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Joined: 22 Jan 2012
Posts: 5646
Location: Prospect, VA

PostPosted: Sat Mar 28, 2020 4:58 pm    Post subject: Reply with quote

The IACV-AAV valve controls cold start fast idle and helps maintain base idle under loads. The valve, which sits on the bottom side of the upper plenum, could be dirty or bad. Try following the factory service manual procedure to adjust the base idle and check the ignition timing to see if that makes any difference. It also wouldn't be a bad idea to check the inside of the throttle body and the throttle plate for varnish build-up and clean, as necessary. It also wouldn't hurt to do a fuel pressure leak down test to make sure an injector is not leaking while the engine is off and make sure the spark plugs aren't worn out.
_________________
2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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krieg17



Joined: 02 Jun 2019
Posts: 8

PostPosted: Sun Mar 29, 2020 8:49 am    Post subject: Reply with quote

Damn, you're the man. Thanks for the quick reply! Well I can't argue with you, you clearly know your stuff. After researching your analysis, it seems like a pretty spot on place to start. Was hoping it would be something a little easier though! I've done all suspension and bunch of other stuff, but I'm kind of limited in confidence and work space (apartment) when it comes to taking engine pieces off and such.

I think i'll start with cleaning the MAF, probably won't help, but it's never been done, and is easy...so no harm no foul WHEN it doesn't work.

To do a mobile mechanic looks to be about $450 for IACV replacement. Last question, can this lead to other problems if not taken care of quickly? As it's not too much of a nuisance at this time.

Thanks bro!
J
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smj999smj
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Joined: 22 Jan 2012
Posts: 5646
Location: Prospect, VA

PostPosted: Mon Mar 30, 2020 12:56 pm    Post subject: Reply with quote

Not really. You might get a rough idle or, worse case scenario, an engine stall, if you have a lot of loads on the engine at a stop (air conditioning, headlamps, etc.). Hard starting in cold temperatures would be another issue.
_________________
2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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