2000 5.3 silverado issue.
Thread Starter
Staging Lane
Joined: May 2014
Posts: 67
Likes: 0
2000 5.3 silverado issue. So I have a 2000 silverado 5.3, with a 222/224 comp cam, stock injectors, intake, and stall. My truck is tuned by hp tuners that a good friend has.. The problem I'm having is when I stomp the pedal or get In it , the truck starts to take off then it just falls on it's face & the wideband says 20.00 on the lean side. Any suggestions?
Have you checked fuel pressure? I would also change the fuel filter for starters.
Could be a ground or power issue so check all those and also look around the crank sensor wiring to make sure it's not shorting out.
Also check the logs for signs of knock retard. I just put a baby cam in my 99 and it started triggering 8* false knock that I couldn't get to tune out until I loaded a tune from a 2002 truck with the newer operating system in, then tuned that rather than the stock tune.
Could be a ground or power issue so check all those and also look around the crank sensor wiring to make sure it's not shorting out.
Also check the logs for signs of knock retard. I just put a baby cam in my 99 and it started triggering 8* false knock that I couldn't get to tune out until I loaded a tune from a 2002 truck with the newer operating system in, then tuned that rather than the stock tune.
Was it not acting up when he tuned it?
I would also inspect and clean the MAF, or unplug it and gently see if it runs better...don't just wail on it hard in case the VE tuning isn't close. Sounds like you have a wideband, keep an eye on that and if it drifts lean let out.
If your friend can post the tune someone with HP tuners might be able to help you look over it. I am a novice, just trying to help. There are some professionals here but they like to see as much detail as possible along with the tune file and logs if possible.
I would also inspect and clean the MAF, or unplug it and gently see if it runs better...don't just wail on it hard in case the VE tuning isn't close. Sounds like you have a wideband, keep an eye on that and if it drifts lean let out.
If your friend can post the tune someone with HP tuners might be able to help you look over it. I am a novice, just trying to help. There are some professionals here but they like to see as much detail as possible along with the tune file and logs if possible.
Thread Starter
Staging Lane
Joined: May 2014
Posts: 67
Likes: 0
I don't have a pic of the logs, what is weird is, if you get on the pedal little by little it's okay until you get to about 85mph and 4,000 rpm and then it will just shut me down, and the wideband leans out, let out of it and it's fine. I don't know what it could be in less my fuel pump can't keep up and I need a bigger one.
4000rpm is the factory trigger for the PCM to stop using a mix of MAF and VE to calculate fueling and rely solely on the MAF for heavy throttle acceleration. (how I understand it anyway, please correct me if I'm wrong)
Try a different MAF from a working truck and/or have the MAF calibration in the tune checked.
Could still be a fueling issue and be a coincidence but it's an easy thing to check.
Try a different MAF from a working truck and/or have the MAF calibration in the tune checked.
Could still be a fueling issue and be a coincidence but it's an easy thing to check.
