The P1316 means there are codes stored in the IDM. You have to run an injector buzz test to get the IDM to cough up the codes. The P1247 is a boost code. That explains your loss of power. You need to do some testing to see if your turbo is the issue or a massive leak. Or even a MAP sensor / hose.
EARLY 99, Started Troubleshooting Need Help
Early 99' 7.3 with 130K miles, out for a drive several days ago just running down the road about 60 MPH, the Check Engine light came on, instantly lost power could hold 30 MPH at 3/4 throttle, no smoke, slightest uphill grade hard to maintain 30 and EGT's reading from sensor in left bank going way high just attempting to limp home several miles. Horrible unstable low idle. Went under the hood feeling like I maybe lost my right bank injector feed plug. I started wiggling the harness on the right bank the Idle cleared up the Check Engine light went out and it seemed to running normal again on a quick test drive. (It also threw Codes P1247 and P1316)
Hesitant to drive too far from home I decided to bring it into the garage and find the problem before it left me stranded or did any further damage. When I started it after sitting a few days, it started fine but my idle was high ... about 1,100 -1,200
Pulled the right side valve cover off thinking I would find an internal disconnected plug or burnt pins everything was pristine. Visually inspected the remainder of the harness, primary connection block and the underside of the harness that can rub the left valve cover and everything looks good.
Before I go any further and remove the left valve cover which i will likely do anyway since it is the "Easy" side and change out the original gaskets, I thought I would check in with the experts on the site for the first time to see if I could gain any guidance relating to what is going on and some troubleshooting suggestions.
Thanks
Hesitant to drive too far from home I decided to bring it into the garage and find the problem before it left me stranded or did any further damage. When I started it after sitting a few days, it started fine but my idle was high ... about 1,100 -1,200
Pulled the right side valve cover off thinking I would find an internal disconnected plug or burnt pins everything was pristine. Visually inspected the remainder of the harness, primary connection block and the underside of the harness that can rub the left valve cover and everything looks good.
Before I go any further and remove the left valve cover which i will likely do anyway since it is the "Easy" side and change out the original gaskets, I thought I would check in with the experts on the site for the first time to see if I could gain any guidance relating to what is going on and some troubleshooting suggestions.
Thanks
1 - 7 of 7 Posts
Second thing I looked at was the MAP sensor hose. Unfortunately I made the mistake of digging into the injector harnesses so I'm going to go ahead and do some preventive maintenance and change out the 24 year old gaskets and harnesses while I'm that far in. I pulled the codes through my CTS-3, what system is typically best for performing the buzz test?The P1316 means there are codes stored in the IDM. You have to run an injector buzz test to get the IDM to cough up the codes. The P1247 is a boost code. That explains your loss of power. You need to do some testing to see if your turbo is the issue or a massive leak. Or even a MAP sensor / hose.
Forscan is a free program that runs on iOS, Android, or PC. You need a suitable adapter for it. Look here for suggestions. ELM327-compatible adapters - how to choose - FORScan forum
Thanks great info, I'll dig into Forscan and see what I can do.
In addition to what RT provided, there is a how-to thread for FORScan in the sticky threads link at the top of this forum:
www.thedieselstop.com
FORScan calls the buzz test the "KOEO Injector Electrical Self Test"
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FORScan/FORScan Lite How-To Thread
The information presented here describes how to use FORScan and FORScan Lite on our 7.3L trucks, to read diagnostic trouble codes, run self tests, and monitor important engine parameters. Let me know if there is anything you'd like to see here that is not mentioned related to this diagnostic...
www.thedieselstop.com
FORScan calls the buzz test the "KOEO Injector Electrical Self Test"
Thanks, I clearly have a lot to learn. Waiting for parts now to at least get back to the original problem. As I previously stated, I jumped too far too deep right out of the gate and dug into the valve cover harnesses and connectors so changing out all the original stuff for hopefully another 24 plus years of service. While I'm in the valve covers and I have direct connection points and general access, I'm going to Ohm out the glow plugs and injectors for additional precaution.
It's been a great truck, I've done a bunch of upgrades and precausionary maintenance, this is the first real operational problem I have ever experianced with it.
I will followup with findings, repair or additional discoveries as this project progresses.
It's been a great truck, I've done a bunch of upgrades and precausionary maintenance, this is the first real operational problem I have ever experianced with it.
I will followup with findings, repair or additional discoveries as this project progresses.
1 - 7 of 7 Posts
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