Way lean!20-23/guru's help!
10-11-2009, 09:13 PM
#1
Way lean!20-23/guru's help! Ls1/m6 in my 72ss camaro.ms3,prc 5.3's,all bolt ons ,fast 92/92.car has been built for 4.5 yrs with 19.5k on it.recently started acting like it was loading up a lil,i could get on it & was ok.lately pwr was way dwn,would normally lay out 3rd hard,today would barely swing out 2nd.then throttle is lost & will only rev to about 3grand.i limp back home to check a plug & was way white !so i ran a scan of idle & a/f was bouncing 20 to 23.what is up? What would cause this?car will not rev above 3grand & does not do that well.all pluges had just been changed due to this issue,they were also white /lean.
10-12-2009, 08:36 AM
#4
My prsr guages were at the shop & i will pick em up today & check fuel pressure next.the filter is a filter/regulator with return line built in from a 2000 s-10, so only a single fuel line to mtr was needed.this was a gradual issue over the last 2 wks or so.i have never had a pump go slowly or allow the mtr to still run ?has anyone else ?this is the second walbro 255ltr pump in tank as the first one fried due to a short.will post after i check the fuel prsr.thanks for any & all help!:d
10-12-2009, 09:28 PM
#7
holy **** 23 to 1 AFR......that is amazingly lean...you got some serious fueling issues. start out with the easiest/cheapest things like fuel filter, check fuel pressure, check the voltage to the pump, check for crushed fuel lines(if you jacked it up lately). last things you want check would be fuel pump/injectors after all the others have been checked. ive even went very lean due to a faulty MAF sensor so look into all of those and let us know.
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10-13-2009, 10:37 AM
#8
Problem found! I had ran a scan to check sensors ect.got home last nt & hooked up fuel prsr gauge ,with key on went to 10psi & bled rt back to 0.car started fine & held 8-10 psi at idle.upon dropping the tank i find the hose from the pump to hard line in tank is deteriated & split .this hose was installed new 3-4 mnths ago .ye i know whats up?it was f/i rated reinforced hose.goes to show sometimes new parts can still be bad ,even still had proper stamping on the hose i took out.this is a first on this for me.good news is it did not cost any $ other than my time & a new pc of hose.yes whatching your a/f ratio 20-23 at idle & bounce to 30 when you pat the throttle will freak you out!rt after that a quick check of plugs revealed no piston matter on them,thank god!still can't believe it would even idle at 10 psi when an ls1 holds 59psi at the rail!:d
