ideling issues..
Sep 15, 2011 | 08:48 PM
#1
ideling issues..
Ok heres the deal guys. Crank the truck up it idles good. Drop it in gear, drive or reverse and as the truck starts to move it idles up and down and almost shuts off, sometimes does shut off. The truck is pulling bank 1,2 system too lean. Any ideas? Maybe bad o2s, just dont wanna waste the money if its not the problem... Thanks Nick
Sep 16, 2011 | 09:39 AM
#4
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From: san antonio, tx
could be a few things.
maf has everything to do with a lean condition, that's easy to determine, swap it out with another truck.
truck must be checked for vac leaks, the only way to do this and be certain, a smoke machine.
using hptuners, check for codes and o2 switching.
it could also be fuel pressure, so that might be something to add to the list.
since you'll have hptuners, perform some idle, normal, aggressive and wot driving, then when done, click STOP and Save Data as... and send me the scan file, allen@nelsonperformance.com
Be sure to keep an eye on a/f ratio at wot, must be rich enough during those pulls, if not, let off.
maf has everything to do with a lean condition, that's easy to determine, swap it out with another truck.
truck must be checked for vac leaks, the only way to do this and be certain, a smoke machine.
using hptuners, check for codes and o2 switching.
it could also be fuel pressure, so that might be something to add to the list.
since you'll have hptuners, perform some idle, normal, aggressive and wot driving, then when done, click STOP and Save Data as... and send me the scan file, allen@nelsonperformance.com
Be sure to keep an eye on a/f ratio at wot, must be rich enough during those pulls, if not, let off.
Sep 16, 2011 | 04:05 PM
#5
could be a few things.
maf has everything to do with a lean condition, that's easy to determine, swap it out with another truck.
truck must be checked for vac leaks, the only way to do this and be certain, a smoke machine.
using hptuners, check for codes and o2 switching.
it could also be fuel pressure, so that might be something to add to the list.
since you'll have hptuners, perform some idle, normal, aggressive and wot driving, then when done, click STOP and Save Data as... and send me the scan file, allen@nelsonperformance.com
Be sure to keep an eye on a/f ratio at wot, must be rich enough during those pulls, if not, let off.
maf has everything to do with a lean condition, that's easy to determine, swap it out with another truck.
truck must be checked for vac leaks, the only way to do this and be certain, a smoke machine.
using hptuners, check for codes and o2 switching.
it could also be fuel pressure, so that might be something to add to the list.
since you'll have hptuners, perform some idle, normal, aggressive and wot driving, then when done, click STOP and Save Data as... and send me the scan file, allen@nelsonperformance.com
Be sure to keep an eye on a/f ratio at wot, must be rich enough during those pulls, if not, let off.
Sep 16, 2011 | 09:39 PM
#6
Performance Trucks Sponsor
iTrader: (5)
Joined: Jul 2002
Posts: 1,439
Likes: 0
From: san antonio, tx
I'll check your file, but I do remember tuning for 72lb'ers.
A lean hesitation or stumble or high ltrims could be a vac leak.
i'm sure fuel pressure is ok if a/f ratio is ok at cruise and wot, those values are fine.
send the scans over, i'll analyze them and get back with you.
A lean hesitation or stumble or high ltrims could be a vac leak.
i'm sure fuel pressure is ok if a/f ratio is ok at cruise and wot, those values are fine.
send the scans over, i'll analyze them and get back with you.
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