Went WAY lean
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 759
Likes: 47
Went WAY lean
A couple days ago I did a little pull and at above 5k the car felt flat so my first thought was look at gauges. Boost was good meth was on and my wideband was at 16.1 so i immediately got off the gas threw it in neutral. Limped it home but the car ran fine the rest of the way home AFR were right where they should be no misfire or codes. When I got the car Home i pulled plugs and they all looked good and everything seems fine. I fired the car back up went to the gas station topped it off and did another pull(when I did the pull and it went lean it was just a hair above a 1/4). My only thought is I know these cars have been known to go lean under 1/4 tank so my only thought is I ran the tank dry. Any other thoughts?
I put new plugs in because they are all out so why not even though they only had roughly 600 miles on them.
Car has 60psi at idle for fuel pressure.
I put new plugs in because they are all out so why not even though they only had roughly 600 miles on them.
Car has 60psi at idle for fuel pressure.
Melting Slicks
Joined: Mar 2005
Posts: 2,225
Likes: 42
From: Okinawa
Probably since the fuel in the tank is what cools the pump and you were hammering on it with a 1/4 tank lol. Also makes it easier for the pump to run dry and just not a good idea with high hp.
Last edited by SBCGENII; May 17, 2017 at 04:24 PM.
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 759
Likes: 47
ya I know it's not a good idea I was about one notch above a 1/4 of a tank and just got done with the 2 hour drive and didn't even think to look at the gas gauge if I would have looked before I wouldn't have stepped on it.
Drifting
Joined: Nov 2014
Posts: 1,978
Likes: 110
From: Switzerland
i have been making pulls with 1/4 fuel or less for two years. no weird afr. at 1/4 fuell the tank is half full. a regular pump cosumes around 150 w. how much heat could it be making? 50 w max. thats nothing. i would say the gauge just had a hickup. mine does from time to time. if you had been logging, thats another story.
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 759
Likes: 47
Originally Posted by Tony Le
You might be sucking that basket dry or before it can pull fuel over from the other side tank or the fuel pump might be hot and dropping fuel pressure.
Originally Posted by FourG63 97GST
what's your fuel setup? and what the power output. sounds far fetched, but i'm curious
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Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 759
Likes: 47
Little update for everyone. I am not sure if this had any relation to my lean at WOT but I started having an issue at first start up the car would want to die and then run lean and once it idled for 30 seconds or so it would richer itself back up to normal. Well I pulled the intake off replaced the gasket on my MAP sensor, replaced all the intake gaskets and the throttle body gasket. The intake gaskets were smushed flat so I am thinking it didn't seal well.
Anyway fired the car up and runs much better idles smooth everything seems much happier at idle and did a couple pulls and the car seems happy.
Anyway fired the car up and runs much better idles smooth everything seems much happier at idle and did a couple pulls and the car seems happy.